7SD Relay Catalog

7 Line Differential Protection / 7SD52/53
SIPROTEC 4 7SD52/53
Multi-End Differential and Distance Protection in One Relay
Function overview
Protection functions
Differential protection with phase-
segregated measurement (87L, 87T)
Restricted earth-fault protection (87N) if a
transformer is within the protection zone
Sensitive meas. stage f. high-resist. faults
Non-switched distance protection with
LSP2173f.eps
6 measuring systems (21/21N)

High resistance ground (earth)-fault
protection for single and three-pole
LSP2314-afp.eps
tripping (50N/51N/67N)
Phase-selective intertripping (85)
Tele (pilot) protection (85/21, 85/67N)
Weak-infeed protection (27WI)
Fig. 7/41 Fault locator (FL)
SIPROTEC 4
7SD52/53 differential protection relay
Power swing detection/tripping (68/68T)
3-stage overcurrent protection
(50, 50N, 51, 51N)
STUB bus protection (50 STUB)
The units measure the delay time in the Switch-onto-fault protection (50HS)
Description
communication networks and adaptively Over/undervoltage protection (59/27) 7
The 7SD52/53 relay provides full scheme match their measurements accordingly. Over/underfrequency protection (81O/U)
differential protection and incorporates all A special GPS-option allows the use of the
Auto-reclosure (79), Synchro-check (25)
functions usually required for the protec- relays in communication networks, where Breaker failure protection (50BF)
tion of power lines. It is designed for all the delay time in the transmit and receive Overload protection (49)
power and distribution levels and protects path may be quite different. Lockout function (86)
lines with two up to six line ends. The relay
is designed to provide high-speed and The 7SD52/53 has the following features: Control functions
phase-selective fault clearance. The relay 2 full-scheme main protections in one Commands f. ctrl of CB and isolators
uses fiber-optic cables or digital communi- unit (differential and distance protec- Monitoring functions
cation networks to exchange telegrams and
includes special features for the use in mul-
tion) Self-supervision of relay and protection
High-speed tripping 10 - 15 ms data (R2R) communication
tiplexed communication networks. Also
pilot wires connections can be used with The serial protection data interfaces Trip circuit supervision (74TC)
an external converter. This contributes to- (R2R interfaces) of the relays can flexibly Measured-value supervision
ward improved reliability and availability be adapted to the requirements of all Oscillographic fault recording
communication media available.
of the electrical power system. Event logging/fault logging
If the communication method is Switching statistics
The relay is suitable for single and changed, flexible retrofitting of commu-
three-phase tripping applications for two nication modules to the existing configu- Front design
up to six line ends. Also, transformers and ration is possible. User-friendly local operation
compensation coils within the differential Tolerates loss of one data connection in a PC front port for relay setting
protection zone are protected as are serial ring topology (routing in 120 ms). The Function keys and 14 LEDs f. local alarm
and parallel-compensated lines and cables. differential protection scheme is fully
The relays may be employed with any type available in a chain topology. Communication interfaces
of system earthing.
Browser-based commissioning tool. 2 serial protection data (R2R) interfaces
The relay also provides a full-scheme and for ring and chain topology
non-switched distance protection as an op- Fault locator for one and two terminal
measurement for high accuracy on long Front interface for connecting a PC
tional main 2 protection. Several telepro-
lines with high load and high fault resis- System interface for connection to a
tection schemes ensure maximum selectiv-
tance. control system via various protocols
ity and high-speed tripping time.
Capacitive charge current compensation IEC 61850 Ethernet
increases the sensitivity of the differential IEC 60870-5-103
protection on cables and long lines. PROFIBUS-FMS/-DP and DNP 3.0
Rear-side service/modem interface
Time synchronization via IRIG-B or
DCF77 or system interface
Siemens SIP 2008 7/43

Application
ANSI ANSI
87L I for lines / cables 50HS Instantaneous high-current
tripping (switch-onto-fault)
87T I for lines / cables 59 27 Overvoltage/undervoltage
with transformers protection
87N Low impedance restricted 81O/U Over/underfrequency protec-
earth-fault protection for tion
transformers
85 Phase-selective 25 Synchro-check
intertrip, remote trip
86 Lockout function 79 Single or three-pole
auto-reclosure with new
adaptive technology
21 21N Distance protection 49 Overload protection
FL Fault locator 50BF Breaker failure protection
68 68T Power swing detec- 74TC Trip circuit supervision
tion/tripping
85/21 Teleprotection for distance 50-STUB STUB bus protection
protection
27WI Weak-infeed protection
Directional earth(ground)-
7 50N 51N
fault protection
67N
85/67N Teleprotection for earth
(ground)-fault protection
50 50N Three-stage overcurrent

protection
51 51N
*) Option
Fig. 7/42
7/44 Siemens SIP 2008

Application The link to the other relays is made by The 7SD52/53 offers many features to
multi-mode or mono-mode FO cables. reliably and safely handle data exchange
Typical applications There are 5 options available, which corre- via communication networks.
spondingly cover:
SIPROTEC 7SD52/53 is a full-scheme dif- Depending on the bandwidth available in
ferential protection relay for two up to six 820 nm, up to 1.5 km, multi-mode the communication system, 64, 128 or
line ends, incorporating all the additional 820 nm, up to 3.5 km, multi-mode 512 kbits/s can be selected for the X21
functions for protection of overhead lines 1300 nm, up to 24 km, mono-mode (RS422) interface; the G703 interface with
and cables at all voltage levels. Also trans- 1300 nm, up to 60 km, mono-mode 64 kbit/s, and G703-E1 (2,048 kbit/s) or
G703-T1 (1,554 kbit/s).
formers and compensation coils within 1550 nm, up to 100 km, mono-mode
the protection zone are protected. The The connection to the communication
7SD52/53 is suitable for single-pole and Direct fiber-optic connection offers high-
device is effected via cost-effective 820 nm
three-pole tripping. The power system star speed data exchange with 512 kbit/s and
interface with multi-mode FO cables.
point can be solid or impedance-grounded improves the speed for remote signaling.
A communication converter converts the
(earthed), resonant-earthed via Peterson At the main line two differential relays are optical to electrical signals. This offers an
coil or isolated. On the TAP-line, the connected to CTs. The communication is interference-free and isolated connection
7SD52/53 differential relay is connected to made via a multiplexed communication between the relay and the communication
current (CT) and optionally voltage (VT) network. device.
transformers. For the differential func-
tions, only CTs are necessary. By con-
necting the relay to VTs, the integrated
"main 2" distance protection can be ap-
plied (full-scheme, nonswitched). There-
fore, no separate distance protection relay
is required.
Fig. 7/43 Application for three line ends (Ring topology)
Cost-effective power system management The SIPROTEC 4 units have a uniform The use of powerful microcontrollers and
design and a degree of functionality which the application of digital measured-value
The SIPROTEC 4 units are numerical re-
represents a benchmark-level of perfor- conditioning and processing largely sup-
lays which also provide control and moni-
mance in protection and control. If the presses the influence of higher-frequency
toring functions and therefore support the
requirements for protection, control or transients, harmonics and DC compo-
user in view of a cost-effective power sys-
interlocking change, it is possible in the nents.
tem management. The security and reli-
majority of cases to implement such
ability of power supply is increased as a
changes by means of parameterization
result of minimizing the use of hardware.
using DIGSI 4 without having to change
The local operation has been designed ac- the hardware.
cording to ergonomic criteria. Large, easy-
to-read backlit displays are provided.

Construction
Connection techniques and housing with

many advantages
1/3, 1/2, 2/3, and 1/1-rack sizes:
These are the available housing widths of
the 7SD52/53 relays, referred to a 19" mod-
ule frame system. This means that previous
models can always be replaced. The height
LSP2174-afp.tif
LSP2166-afp.tif
is a uniform 245 mm for flush-mounting
housings and 266 mm for surface-mount-
ing housings for all housing widths. All ca-
bles can be connected with or without ring
lugs. Plug-in terminals are available as an
option. It is thus possible to employ pre-
fabricated cable harnesses. In the case of Fig. 7/44 Fig. 7/45
surface mounting on a panel, the connec- Flush-mounting housing Rear view of flush-mounting housing with
tion terminals are located above and below with screw-type terminals covered connection terminals and wirings
in the form of screw-type terminals. The
communication interfaces are located in a
sloped case at the top and bottom of the
housing.
LSP2237-afp.tif
LSP2219-afp.eps
Fig. 7/47
Communication interfaces
in a sloped case in a surface-
mounting housing
Fig. 7/46
Surface-mounting housing with screw-type
terminals

Differential and restraint currents are
monitored continuously during normal
Differential protection (ANSI 87L, 87T, 87N) operation and are displayed as opera-
tional measurements.
The differential protection function has the High stability during external faults even
following features: with different current transformers satu-
It is possible to select the operating mode ration level. For an external fault, only
as "main" or as "main 1", if the back-up 5 ms saturation-free time are necessary
distance protection is activated as to guarantee the stability of the differen-
"main 2". tial configuration.
Measurements are performed separately With transformers or compensation coils
for each phase; thus the trip sensitivity is in the protection zone, the sensitive trip
independent of the fault type. stage can be blocked by an inrush detec-
tion function. It works with the second
An adaptive, sensitive measurement
harmonic of the measured current which
method with high sensitivity for differen-
is compared with the fundamental com-
tial fault currents below the rated current
ponent.
offers the detection of highly resistive
faults. This trip element uses special fil- With transformers in the protection Fig. 7/48 Tripping characteristic
ters, which offers high security even with zone, vector group adaptation and
high level DC-components in the short- matching of different CT ratios are Data communication is immune to
circuit current. The trip time of this stage carried out in the relay. Additionally, the electromagnetic interference because
is about 30 ms. zero-sequence current flowing through fiber-optic cables are employed in the
an earthed neutral is eliminated from the critical region
A high-set differential trip stage which
clears differential fault currents higher
differential measurement. The 7SD52/53 Supervision of each individual incoming
therefore works like a transformer differ- telegram and of the entire communica-
than the rated current within 10 15 ms
ential relay, whereas the line ends may be tion path between the units without
offers fast tripping time and high-speed
fault clearence time.
far away. additional equipment. 7
A more sensitive protection for trans-
When a long line or cable is switched on, Unambiguous identification of each unit
formers within the protection zone is is ensured by assignment of a settable
transient charge currents load the line.
given by measurement of the star-point communication address within a differ-
To avoid a higher setting of the sensitive
current on an earthed winding. There- ential protection topology. Only those
differential trip stage, this setpoint may
fore the IE current measuring input has units mutually known to each other can
be increased for a settable time. This of-
to be used. cooperate. Incorrect interconnection of
fers greater sensitivity under normal load
If the sum of the phase currents of wind- the communication links results in
conditions.
ing is compared with the measured blocking of the protection system.
With the setting of the CT-errors the star-point current, a sensitive earth-cur-
relay automatically calculates the re- Detection of reflected telegrams in the
rent differential protection (REF) can be communication system.
straint/stabilization current and adapts implemented.
its permissible sensitivity according to Detection of delay time changes in
This function is substantially more sensi-
the CTs data in the differential configu- communication networks.
tive than the differential protection dur-
ration, optimizing sensitivity. ing faults to earth in a winding, detecting Measurement of the delay time to the
Different CT ratios at the line ends are fault currents as small as 10 % of the remote line ends with dynamic compen-
handled inside the relay. The mismatch transformer rated current. sation of the delay in the differential
of 1 to 6 is allowed. measurement. Supervision of the maxi-
The differential protection trip can be Enhanced communication features for mum permissible delay time is included.
guarded with an overcurrent pickup. communication networks Generation of alarms on heavily dis-
Thus differential current and overcur- turbed communication links. Faulty
rent lead to a final trip decision. The data required for the differential telegram counters are available as
Easy to set tripping characteristic. calculations are cyclically exchanged in operational measurement.
Because the relay works adaptively, only full-duplex mode in form of synchronous, With a GPS high-precision 1-s pulse from
the setpoint IDiff > (sensitive stage) and serial telegrams between the protection a GPS receiver the relays can be synchro-
IDiff >> (high-set current differential units. The telegrams are secured with CRC nized with an absolute, exact time at each
stage) must be set according to the check sums, so that transmission errors in line end. In this way, the delay in the re-
charge current of the line/cable. a communication network are immediately ceive and transmit path can be measured
detected.
With an optional capacitive charge cur- exactly. With this optional feature the relay
rent compensation, the sensitivity can be can be used in communication networks
increased to 40 % of the normal setting where this delay times are quite different.
of IDIFF>. This function is recommended
for long cables and long lines.

Phase-selective intertrip and remote

trip/indications
Normally the differential fault current is
calculated for each line end nearly at the
same time. This leads to fast and uniform
tripping times. Under weak infeed condi-
tions, especially when the differential func-
tion is combined with an overcurrent
pickup a phase-selective intertrip offers a
tripping of all line ends.
7SD52/53 has 4 intertrip signals which are
transmitted in high-speed (< 20 ms) to
the other line ends. These intertrip signals
can also be initiated by an external relay
via binary inputs and therefore be used to
indicate, for example, a directional deci-
Fig. 7/49 Differential protection in ring or chain topology
sion of the backup distance relay.
In addition, 4 high-speed remote trip sig-
nals are available, which may be initiated In a ring topology, one line end can be
by an external or internal event. logged out from the differential protec-
24 remote signals can be freely assigned tion topology for service or maintenance
to inputs and outputs at each line end reasons by a signal via binary input.
and are circulating between the different Checks for the breaker position and load
7 devices. current are made before this logout is ini-
tiated. In a chain topology, the relays at
Communication topologies / modes of the end of the line can be logged out from
operation the differential protection topology.
The whole configuration can be set up
The differential relays may work in a ring into a test mode. All functions and indi-
or daisy chain line topology. Use of a test cations are available except the breakers
mode offer advantages under commission- are not tripped. The local relay can be
ing and service conditions. tested and no trip or intertrip reaction is
The system tolerates the loss of one data effected by the other relays.
connection in a ring topology. The ring
topology is rerouted within 20 ms form-
ing then a chain topology, while the dif-
ferential protection function is
immediately reactivated.
When the communication connections
need to be reduced or when these are not
available, the whole system is able to
function without interruption as chain
topology. At the line ends, only cost-
effective 7SD52/53 relays with one pro-
tection data interface are necessary for
this application.
The two-end line is a special case, be-
cause when the main connection is inter-
rupted, the communication switches
over from a main path to a secondary
path. This hot standby transmission
function ensures a high availability of the
system and protects differential protec-
tion against communication route failure
on important lines.

Distance protection (ANSI 21, 21N)

7SD52/53 provides a non-switched dis-
tance protection featuring all well-proven
algogrithms of 7SA522 and 7SA6. It is pos-
sible to select the operating mode "main"
or "main 2", if the back-up differential is
activated as "main 1". By parallel calcula-
tion and monitoring of all six impedance
loops, a high degree of sensitivity and se-
lectivity is achieved for all types of faults.
The shortest tripping time is less than one
cycle. All methods of neutral-point con-
nection (resonant earthing, isolated, solid
or low-resistance earthing) are reliably
dealt with. Single and three-pole tripping is
Fig. 7/50
possible. Overhead lines can be equipped
with or without series capacitor compensa- Distance protection:
quadrilateral characteristic
tion.
Quadrilateral and mho characteristics
The 7SD52/53 relay provides quadrilateral
as well as mho zone characteristics. Both
characteristics can be used separately for
phase and ground (earth) faults. Resistance
ground (earth) faults can, for instance, be 7
covered with the quadrilateral characteris-
tic and phase faults with the mho charac-
teristic.
Alternatively, the quadrilateral characteris-
tic is available with 4 different pickup
methods:
Overcurrent pickup I>>
Voltage-dependent overcurrent pickup
V/I
Fig. 7/51
Voltage-dependent and phase angle-
Distance protection:
dependent overcurrent pickup V/I/ mho characteristic
Impedance pickup Z<
Load zone
Parallel line compensation be set separately for faults with and with-
In order to guarantee a reliable discrimi- out earth involvement. This characteristic
nation between load operation and short- The influence of wrong distance measure-
has therefore an optimal performance in
circuit especially on long high loaded ment due to parallel lines can be compen-
case of faults with fault resistance. The dis-
lines the relay is equipped with a select- sated by feeding the neutral current of the
tance zones can be set forward, reverse or
able load encroachment characteristic. parallel line to the relay. Parallel line com-
non-directional. Sound phase polarization
Impedances within this load encroachment pensation can be used for distance protec-
and voltage memory provides a dynami-
characteristic prevent the distance zones tion as well as for fault locating.
cally unlimited directional sensitivity.
from unwanted tripping.
6 distance zones
Mho
Absolute phase-selectivity Five independent distance zones and one
separate overreach zone are available. Each The mho tripping characteristic provides
The distance protection incorporates a
distance zone has dedicated time stages, sound phase respectively memory polariza-
well-proven highly sophisticated phase se-
partly separate for single-phase or multi- tion for all distance zones. The example in
lection algorithm. The pickup of unfaulted
phase faults. Ground (earth) faults are de- this figure shows the characteristic for a
loops is reliably eliminated to prevent the
tected by monitoring the neutral current forward fault where the mho circle ex-
adverse influence of currents and voltages
3I0 and the zero-sequence voltage 3V0. pands to the source impedance but never
in the fault-free loops. This phase selection
more than the selected impedance reach.
algorithm achieves single-pole tripping and
The quadrilateral tripping characteristic per- This mho circle expansion guarantees safe
correct distance measurement in a wide
mits separate setting of the reactance X and and selective operation for all types of
application range.
the resistance R. The resistance section R can faults, even for close-in faults.

Elimination of interference signals

Digital filters render the unit immune to
interference signals contained in the meas-
ured values. In particular, the influence of
DC components, capacitive voltage trans-
formers and frequency changes is consider-
ably reduced. A special measuring method
is employed in order to assure protection
selectivity during saturation of the current
transformers.
Measuring voltage monitoring
Tripping of the distance protection is
blocked automatically in the event of fail-
ure of the measuring voltage, thus prevent-
ing spurious tripping. Fig. 7/52
The measuring voltage is monitored by the Power swing current and voltage wave forms
integrated fuse failure monitor. Distance
protection is blocked if either the fuse fail-
ure monitor or the auxiliary contact of the
voltage transformer protection switch op-
erates and, in this case, the EMERGENCY
definite-time overcurrent protection can
7 be activated.
Power swing detection (ANSI 68, 68T)

Dynamic transient reactions, for instance
short-circuits, load fluctuations, Fig. 7/53
auto-reclosures or switching operations
Power swing
can cause power swings in the transmission circle diagram
network. During power swings, large cur-
rents along with small voltages can cause
unwanted tripping of distance protection
relays. To avoid uncontrolled tripping of
the distance protection and to achieve con-
trolled tripping in the event of loss of syn-
chronism, the 7SD52/53 relay is equipped DUTT, direct underreaching zone trans- Phase-selective transmission is also possi-
with an efficient power swing detection fer trip (together with Direct Transfer ble with multi-end applications, if some
function. Power swings can be detected Trip function) user-specific linkages are implemented by
under symmetrical load conditions as well way of the integrated CFC logic. During
as during single-pole auto-reclosures. The carrier send and receive signals are disturbances in the transmission receiver
available as binary inputs and outputs and or on the transmission circuit, the tele-
Tele (pilot) protection for distance protection can be freely assigned to each physical relay protection function can be blocked by a bi-
(ANSI 85-21) input or output. At least one channel is re- nary input signal without losing the zone
quired for each direction. selectivity. The control of the overreach
A teleprotection function is available for zone Z1B (zone extension) can be switched
fast clearance of faults up to 100 % of the Common transmission channels are
power-line carrier, microwave radio and over to the auto-reclosure function.
line length. The following operating modes A transient blocking function (Current re-
may be selected: fiber-optic links. The serial protection data
interface can be used for direct connection versal guard) is provided in order to sup-
PUTT, permissive underreaching zone to a digital communication network, fiber- press interference signals during tripping
transfer trip optic or pilot-wire link as well. of parallel lines.
POTT, permissive overreaching zone
7SD52/53 also permits the transfer of
transfer trip
phase-selective signals. This feature is par-
UNBLOCKING ticularly advantageous as it ensures reliable
BLOCKING single-pole tripping, if two single-pole
Directional comparison pickup faults occur on different lines. The trans-
Pilot-wire comparison mission methods are suitable also for lines
Reverse interlocking with three ends (three-terminal lines).

power. Each overcurrent stage can be set in

forward or reverse direction or for both di-
Direct transfer tripping rections (non-directional). As an option
the 7SD52/53 relay can be provided with a
Under certain conditions on the power sensitive neutral (residual) current trans-
system it is necessary to execute remote former. This feature provides a measuring
tripping of the circuit-breaker. The range for the neutral (residual) current
7SD52/53 relay is equipped with phase- from 5 mA to 100 A with a nominal relay
selective intertripping signal inputs and current of 1 A and from 5 mA to 500 A
outputs. with a nominal relay current of 5 A. Thus
the ground (earth)-fault overcurrent pro-
Weak-infeed protection: echo and/or trip tection can be applied with extreme sensi-
(ANSI 27 WI) tivity.
To prevent delayed tripping of permissive The function is equipped with special digi-
schemes during weak or zero infeed situa- tal filter algorithms, providing the elimina-
tions, an echo function is provided. tion of higher harmonics. This feature
If no fault detector is picked up at the is particularly important for low zero-
weak-infeed end of the line, the signal sequence fault currents which usually have
received here is returned as echo to allow a high content of 3rd and 5th harmonics.
accelerated tripping at the strong infeed Inrush stabilization and instantaneous
end of the line. It is also possible to initiate switch-onto-fault trip can be activated sep-
tripping at the weak-infeed end. A phase- arately for each stage as well.
selective 1-pole or 3-pole trip is issued if a t=
0.14
Tp
Different operating modes can be selected.
(I I p )
0.02
permissive trip signal (POTT or Unblock- 1
The ground(earth)-fault protection is suit-
ing) is received and if the phase-earth volt-
able for three-phase and, optionally, for
age drops correspondingly. As an option, Fig. 7/54 Normal inverse
single-phase tripping by means of a sophis- 7
the weak-infeed logic can be equipped ac-
ticated phase selector. It may be blocked
cording to a French specification.
during the dead time of single-pole auto- protection and the distance protection
reclose cycles or during pickup of the dis- or only during interruption of the protec-
Directional ground(earth)-fault protection
tance protection. tion communication and/or failure of
for high-resistance faults
(ANSI 50N, 51N, 67N) the voltage in the VT secondary circuit
Tele (pilot) protection for directional (emergency operation). The secondary
In grounded (earthed) networks, it may ground(earth)-fault protection voltage failure can be detected by the inte-
happen that the distance protection sensi- (ANSI 85-67N) grated fuse failure monitor or via a binary
tivity is not sufficient to detect high-resis- input from a VT miniature circuit-breaker
The directional ground(earth)-fault
tance ground (earth) faults. The 7SD52/53 (VT m.c.b. trip).
overcurrent protection can be combined
protection relay has therefore protection
with one of the following teleprotection The following inverse-time characteristics
functions for faults of this nature.
schemes: according to IEC 60255-3 and ANSI/IEEE
The ground (earth)-fault overcurrent pro- are provided:
Directional comparison
tection can be used with 3 definite-time
stages and one inverse-time stage (IDMT). BLOCKING Inverse
A 4th definite-time stage can be applied in- UNBLOCKING Short inverse
stead of the 1st inverse-time stage. The transient blocking function (current Long inverse
reversal guard) is also provided in order to Moderately inverse
Inverse-time characteristics according to
IEC 60255-3 and ANSI/IEEE are provided suppress interference signals during trip- Very inverse
(see Technical data). An additional loga- ping of parallel lines. Extremely inverse
rithmic inverse-time characteristic is also The pilot functions for distance protection Definite inverse
available. and for ground(earth)-fault protection can
use the same signaling channel or two sep- STUB bus overcurrent protection
The direction decision can be determined
arate and redundant channels. (ANSI 50(N)-STUB)
by the neutral current and the zero-
sequence voltage or by the negative- The STUB bus overcurrent protection is
sequence components V2 and I2. In addi- Backup overcurrent protection a separate definite-time overcurrent stage.
tion or as an alternative to the directional (ANSI 50, 50N, 51, 51N) It can be activated from a binary input
determination with zero-sequence voltage, The 7SD52/53 provides a backup over- signaling the open line isolator (discon-
the star-point current of a grounded current protection. Two definite-time nector) is open. Settings are available for
(earthed) power transformer may also be stages and one inverse-time stage (IDMTL) phase and ground (earth)-faults.
used for polarization. Dual polarization are available, separately for phase currents
applications can therefore be fulfilled. and for the neutral (residual) current. Two
Alternatively, the direction can be deter- operating modes are selectable. The func-
mined by evaluation of zero-sequence tion can run in parallel to the differential

Tripping by the overvoltage measuring Auto-reclosure (ANSI 79)

elements can be effected either at the local
The 7SD52/53 relay is equipped with an
Instantaneous high-speed switch-onto- circuit-breaker or at the remote station by
auto-reclose function (AR). The function
fault overcurrent protection (ANSI 50HS) means of a transmitted signal.
includes several operating modes:
The 7SD52/53 is fitted, in addition, with
Instantaneous tripping is possible when 3-pole auto-reclosure for all types of
energizing a faulty line. In the event of three two-stage undervoltage measuring
faults; different dead times are available
large fault currents, the high-speed elements:
depending the type of fault
switch-onto-fault overcurrent stage can Phase-to-earth undervoltage 1-pole auto-reclosure for 1-phase faults,
initiate very fast 3-pole tripping. Phase-to-phase undervoltage no reclosing for multi-phase faults
With lower fault currents, instantaneous Positive-sequence undervoltage 1-pole auto-reclosure for 1-phase faults
tripping after switch-onto-fault is also pos- and for 2-phase faults without earth, no
The undervoltage measuring elements can
sible reclosing for multi-phase faults
be blocked by means of a minimum cur-
1-pole auto-reclosure for 1-phase and
if the breaker positions at the line ends rent criterion and by means of binary in-
puts. 3-pole auto-reclosing for multi-phase
are monitored and connected to the re-
faults
lays. This breaker position monitor offers
a high-speed trip during switch-onto- Frequency protection (ANSI 81O/U) 1-pole auto-reclosure for 1-phase faults
fault conditions. and 2-phase faults without earth and
Frequency protection can be used for over- 3-pole auto-reclosure for other faults
with the overreach distance zone Z1B or
just with pickup in any zone.
frequency and underfrequency protection. Multiple-shot auto-reclosure
Unwanted frequency changes in the net- Interaction with an external device for
The switch-onto-fault initiation can be de- work can be detected and the load can be auto-reclosure via binary inputs and out-
tected via the binary input "manual close" removed at a specified frequency setting. puts
or automatically via measurement. Frequency protection can be used over a
Control of the integrated AR function by
wide frequency range (45 to 55, 55 to
external protection
Fault locator 65 Hz). There are four elements (selectable
7 as overfrequency or underfrequency) and Adaptive auto-reclosure. Only one line
The integrated fault locator calculates the each element can be delayed separately. end is closed after the dead time. If the
fault impedance and the distance-to-fault. fault persists this line end is switched off.
The result is displayed in ohms, miles, kilo- Breaker failure protection (ANSI 50BF) Otherwise the other line ends are closed
meters or in percent of the line length. Par- via a command over the communication
allel line and load current compensation is The 7SD52/53 relay incorporates a two- links. This avoids stress when heavy fault
also available. stage breaker failure protection to detect currents are fed from all line ends again.
the failure of tripping command execution, Interaction with the internal or an exter-
As an option for a line with two ends, a for example due to a defective ciruit- nal synchro-check
fault locator function with measurement at breaker. The current detection logic is
both ends of the line is available. Monitoring of the circuit-breaker auxil-
phase-segregated and can therefore also iary contacts
Thanks to this feature, accuracy of mea- be used in single-pole tripping schemes. If
surement on long lines under high load the fault current is not interrupted after a In addition to the above-mentioned oper-
conditions and high fault resistances is settable time delay has expired, a retrip ating modes, several other operating prin-
considerably increased. command or a busbar trip command is ciples can be employed by means of the
generated. The breaker failure protection integrated programmable logic (CFC).
Overvoltage protection, undervoltage pro- can be initiated by all integrated protection
tection (ANSI 59, 27) Integration of auto-reclosure in the feeder
functions as well as by external devices via protection allows evaluation of the
A voltage rise can occur on long lines that binary input signals. line-side voltages. A number of voltage-
are operating at no-load or are only lightly dependent supplementary functions are
loaded. The 7SD52/53 contains a number thus available:
of overvoltage measuring elements. Each
measuring element is of two-stage design. DLC
The following measuring elements are By means of dead-line check, reclosure is
available: effected only when the line is
deenergized (prevention of asynchro-
Phase-to-earth overvoltage nous breaker closure).
Phase-to-phase overvoltage ADT
Zero-sequence overvoltage The adaptive dead time is employed only
The zero-sequence voltage can be con- if auto-reclosure at the remote station
nected to the 4th voltage input or be de- was successful (reduction of stress on
rived from the phase voltages. equipment).
Positive-sequence overvoltage of the lo-
cal end or calculated for the remote end
of the line (compounding).
Negative-sequence overvoltage

Monitoring and supervision functions Local measured values

The 7SD52/53 relay provides comprehen- The measured values are calculated from
RDT sive monitoring functions covering both the measured current and voltage signals
Reduced dead time is employed in con- hardware and software. Furthermore, the along with the power factor (cos ), the
junction with auto-reclosure where no measured values are continuously checked frequency, the active and reactive power.
tele-protection method is employed: for plausibility. Therefore the current and Measured values are displayed as primary
When faults within the zone extension, voltage transformers are also included in or secondary values or in percent of the
but external to the protected line, are this monitoring system. specific line rated current and voltage. The
switched off for rapid auto-reclosure relay uses a 20 bit high-resolution AD con-
(RAR), the RDT function decides on the Current transformer / Monitoring functions verter and the analog inputs are factory-
basis of measurement of the return volt- calibrated, so a high accuracy is reached.
age from the remote station which has not A broken wire between the CTs and relay
The following values are available for mea-
tripped whether or not to reduce the dead inputs under load may lead to malopera-
sured-value processing:
time. tion of a differential relay if the load cur-
rent exceeds the differential setpoint. The Currents 3 x IPhase, 3 I0, IE, IE sensitive
Synchronism check (ANSI 25) 7SD52/53 provides fast broken wire super- Voltages 3 x VPhase-Ground, 3 x VPhase-Phase,
vision which immediatelly blocks all line 3 V0,Ven, VSYNC, VCOMP
Where two network sections are switched ends if a broken wire condition is mea- Symmetrical components I1, I2, V1, V2
in by control command or following a sured by a local relay. This avoids mal-
3-pole auto-reclosure, it must be ensured Real power P (Watt), reactive power
operation due to broken wire condition.
that both network sections are mutually Q (Var), apparent power S (VA)
Only the phase where the broken wire is
synchronous. For this purpose, a synchro- detected is blocked. The other phases Power factor PF (= cos )
nism-check function is provided. After remain under differential operation. Frequency f
verification of the network synchronism Differential and restraint current per
the function releases the CLOSE com- Fuse failure monitoring phase
mand. Alternatively, reclosing can be en- Load impedances with directional indica-
abled for different criteria, e.g., checking If any measured voltage is not present due
that the busbar or line is not carrying a to short-circuit or open circuit in the volt-
tion 7
3 x RPhase-Ground, XPhase-Ground
voltage (dead line or dead bus). age transformer secondary circuit the dis-
3 x RPhase-Phase, XPhase-Phase
tance protection would respond with an
unwanted trip due to this loss of voltage.
Long term mean values
Thermal overload protection (ANSI 49) 3 x IPhase; I1; P; P+; P-; Q; Q+; Q-; S
This secondary voltage interruption can be
A built-in overload protection with a cur- detected by means of the integrated fuse Minimum/maximum memory
rent and thermal alarm stage is provided failure monitor. Immediate blocking of 3 x IPhase; I1; 3 x VPhase-Ground
for the thermal protection of cables and distance protection is provided for all types 3 x VPhase-Phase, 3V0; V1; P+; P-; Q+; Q-; S;
transformers. The trip time characteristics of secondary voltage failures. f; power factor (+); power factor (-);
are exponential functions according to from mean values
IEC 60255-8. The preload is thus consid- Additional measurement supervision func- 3 x IPhase; I1; P; Q; S
ered in the trip times for overloads. An ad- tions are Energy meters
justable alarm stage can initiate an alarm Symmetry of voltages and currents Wp+; Wp-; WQ+; WQ-
before tripping is initiated. Summation of currents and voltages Availability of the data connection to the
remote line ends per minute and per hour
Trip circuit supervision (ANSI 74TC) Regarding delay time measuring with the
GPS-version the absolute time for trans-
One or two binary inputs for each circuit- mit and receive path is displayed sepa-
breaker pole can be used for monitoring rately.
the circuit-breaker trip coils including the
connecting cables. An alarm signal is is- Limit value monitoring: Limit values
sued whenever the circuit is interrupted. are monitored by means of the CFC.
Commands can be derived from these
Lockout (ANSI 86) limit value indications.
All binary outputs can be stored like LEDs

and reset using the LED reset key. The
lockout state is also stored in the event of
supply voltage failure. Reclosure can only
be issued after the lockout state is reset.

Measured values at remote line ends

Every two seconds the currents and volt-
ages are freezed at the same time at all
line ends and transmitted via the commu-
nication link. At a local line end, currents
and voltages are thus available with their
amount and phases (angle) locally and re-
motely. This allows checking the whole
configuration under load conditions. In
addition, the differential and
restraint currents are also displayed.
Important communication measurements,
such as delay time or faulty telegrams per
minute/hour are also available as measure-
ments. These measured values can be pro-
cessed with the help of the CFC logic
editor.
Commissioning
LSP2845.tif
Special attention has been paid to commis-
sioning. All binary inputs and outputs can
be displayed and activated directly. This
Fig. 7/55
can simplify the wiring check significantly Browser-aided commissioning: Phasor diagram
7 for the user. The operational and fault
events and the fault records are clearly ar-
ranged.
Furthermore, all currents and optional
voltages and phases are available via com-
munication link at the local relay and are
displayed in the relay, with DIGSI 4 or with
the Web Monitor.
The operational and fault events and fault
records from all line ends share a common
time tagging which allows to compare
events registered in the different line
ends on a common time base.
WEB Monitor Internet technology

simplifies visualization
In addition to the universal DIGSI 4 oper-
ating program, the relay contains a WEB
server that can be accessed via a telecom-
munication link using a browser (e.g.
Internet Explorer). The advantage of this
solution is to operate the unit with stan-
LSP2846.tif
dard software tools and at the same time

make use of the Intranet/Internet infra-
structure. This program shows the protec- Fig. 7/56
tion topology and comprehensive Browser-aided commissioning:
measurements from local and remote line Differential protection tripping characteristic
ends. Local and remote measurements are
shown as phasors and the breaker Stability can be checked by using the oper- Event log and trip log messages are also
positions of each line end are depicted. It is ating characteristic as well as the calculated available. Remote control can be used, if
possible to check the correct connection of differential and restraint values in the the local front panel cannot be accessed.
the current transformers or the correct browser windows.
vector group of a transformer. If the distance protection is active, then the
valid zone characteristic (quadrilateral/
mho) is displayed.

Switching authority Indication derivation

Switching authority is determined accord- A further indication (or a command) can
n Control and automation functions ing to parameters, communication or by be derived from an existing indication.
key-operated switch (when available). Group indications can also be formed. The
Control
volume of information to the system inter-
If a source is set to LOCAL, only local
In addition to the protection functions, the face can thus be reduced and restricted to
switching operations are possible. The fol-
SIPROTEC 4 units also support all control the most important signals.
lowing sequence of switching authority is
and monitoring functions that are required
laid down: LOCAL; DIGSI PC program,
for operating medium-voltage or high- Transmission lockout
REMOTE
voltage substations.
A data transmission lockout can be acti-
Every switching operation and change of
The main application is reliable control of vated, so as to prevent transfer of informa-
breaker position is kept in the status indi-
switching and other processes. tion to the control center during work on
cation memory. The switch command
a circuit bay.
The status of primary equipment or auxil- source, switching device, cause (i.e. spon-
iary devices can be obtained from auxiliary taneous change or command) and result of
contacts and communicated via binary in- a switching operation are retained. Test operation
puts. Therefore it is possible to detect and During commissioning, all indications can
indicate both the OPEN and CLOSED po- Assignment of feedback to command be passed to an automatic control system
sition or a fault or intermediate circuit- for test purposes.
breaker or auxiliary contact position. The positions of the circuit-breaker or
switching devices and transformer taps are
The switchgear or circuit-breaker can be acquired by feedback. These indication in-
controlled via: puts are logically assigned to the corre-
sponding command outputs. The unit can
integrated operator panel
therefore distinguish whether the indica-
binary inputs tion change is a consequence of switching
substation control and protection system operation or whether it is a spontaneous
DIGSI 4
7
change of state (intermediate position).
Command processing Chatter disable

All the functionality of command process- The chatter disable feature evaluates
ing is offered. This includes the processing whether, in a configured period of time,
of single and double commands with or the number of status changes of indication
without feedback, sophisticated monitor- input exceeds a specified figure. If ex-
ing of the control hardware and software, ceeded, the indication input is blocked for
checking of the external process, control a certain period, so that the event list will
actions using functions such as runtime not record excessive operations.
monitoring and automatic command ter-
mination after output. Here are some typi- Filter time
cal applications:
All binary indications can be subjected to a
Single and double commands using 1, filter time (indication suppression).
1 plus 1 common or 2 trip contacts
User-definable bay interlocks Indication filtering and delay
Operating sequences combining several
Indications can be filtered or delayed.
switching operations such as control of
circuit-breakers, disconnectors and Filtering serves to suppress brief changes in
earthing switches potential at the indication input. The indi-
Triggering of switching operations, indication is passed on only if the indication
cations or alarm by combination with voltage is still present after a set period of
existing information time. In the event of indication delay, there
is a wait for a preset time. The information
Automation / user-defined logic is passed on only if the indication voltage is
still present after this time.
With integrated logic, the user can set, via a
graphic interface (CFC), specific functions
for the automation of switchgear or substa-
tion. Functions are activated via function
keys, binary input or via communication
interface.

Commissioning aid via a standard Web

Communication
browser
With respect to communication, particular In the case of the 7SD52/53, a PC with a
emphasis has been placed on high levels of standard browser can be connected to the
flexibility, data integrity and utilization of local PC interface or to the service interface
standards common in energy automation. (refer to Commissioning program).
The design of the communication modules The relays include a small Web server that
permits interchangeability on the one sends its HTML pages to the browser via
hand, and on the other hand provides an established dial-up network connection.
openness for future standards (for exam-
ple, Industrial Ethernet). Retrofitting: Modules for every type of
communication
Local PC interface
Communication modules for retrofitting
The PC interface accessible from the front are available for the entire SIPROTEC 4
of the unit permits quick access to all pa- unit range. These ensure that, where differ-
rameters and fault event data. Of particular ent communication interfaces (electrical or Fig. 7/57
advantage is the use of the DIGSI 4 operat- optical) and protocols (IEC 61850 IEC 60870-5-103 star-type RS232 copper
ing program during commissioning. Ethernet, IEC 60870-5-103, conductor connection or fiber-optic connection
PROFIBUS-FMS/-DP, DNP 3.0, DIGSI,
Rear-mounted interfaces etc.) are required, such demands can be
met.
Two communication modules located on
the rear of the unit incorporate optional
equipment complements and readily per- Safe bus architecture
mit retrofitting. They assure the ability to RS485 bus
comply with the requirements of different With this data transmission via copper
7 communication interfaces. conductors electromagnetic fault influ-
The interfaces make provision for the fol- ences are largely eliminated by the use of
lowing applications: twisted-pair conductors. Upon failure of
a unit, the remaining system continues to
Service /modem interface operate without any disturbances.
By means of the RS232/RS485 or optical Fiber-optic double ring circuit
interface, it is possible to efficiently oper- The fiber-optic double ring circuit is im-
ate a number of protection units cen- mune to electromagnetic interference.
trally via DIGSI 4 or standard browser. Upon failure of a section between two
Remote operation is possible on connec- units, the communication system con-
tion of a modem. This offers the advan- tinues to operate without disturbance. Fig. 7/58
tage of rapid fault clarification, especially Bus structure for station bus with
in the case of unmanned power plants. It is generally impossible to communicate Ethernet and IEC 61850
With the optical version, centralized op- with a unit that has failed. If a unit were to
eration can be implemented by means of fail, there is no effect on the communica-
a star coupler. tion with the rest of the system.
System interface
This interface is used to carry out com-
munication with a control or protection
and control system and supports a var-
iety of communication protocols and in-
terface designs, depending on the mod-
ule connected.

Communication
LSP2163-afpen.tif
IEC 61850 Ethernet
Since 2004, the Ethernet-based
IEC 61850 protocol is the world-
wide standard for protection and
control systems used by power
LSP2164-afpen.tif
supply corporations. Siemens was
the first manufacturer to support
this standard. By means of this
protocol, information can also be
exchanged directly between bay
units so as to set up simple master- Fig. 7/59 Fig. 7/60
less systems for bay and system in- R232/RS485 electrical communication module Communication module, optical double-ring
terlocking. Access to the units via
the Ethernet bus is also possible
with DIGSI.
LSP2162-afpen.tif
IEC 60870-5-103
IEC 60870-5-103 is an internation-
ally standardized protocol for the
efficient communication in the
protected area. IEC 60870-5-103 is
supported by a number of protec-
tion device manufacturers and is
used worldwide. 7
LSP2810.tif
PROFIBUS-DP
Fig. 7/61 Fig. 7/62
PROFIBUS-DP is an industry-
Fiber-optic communication module Fiber-optic Ethernet communication module for
recognized standard for communi- IEC 61850 with integrated Ethernet switch
cations and is supported by a num-
ber of PLC and protection device
manufacturers.
DNP 3.0
DNP 3.0 (Distributed Network
Protocol Version 3) is a messaging-
based communication protocol.
The SIPROTEC 4 units are fully
Level 1 and Level 2 compliant with
DNP 3.0. DNP 3.0 is supported by
a number of protection device
manufacturers.
Fig. 7/63
System solution: Communications

In addition to the differential protection The link to a multiplexed communication

Communication
function, other protection functions can network is made by separate communica-
System solutions for protection and station use this interface to increase selectivity and tion converters (7XV5662). These have
control sensitivity as well as covering advanced ap- a fiber-optic interface with 820 nm and
plications. 2 ST connectors to the protection relay.
Together with the SICAM power automa- The link to the communication network
tion system, SIPROTEC 4 can be used with Fast phase-selective teleprotection signal-
is optionally an electrical X21 or a
PROFIBUS-FMS. Over the low-cost elec- ing for distance protection, optionally
G703/-E1/-T1 interface.
trical RS485 bus, or interference-free via with POTT or PUTT schemes
the optical double ring, the units exchange Two and three-terminal line applications For operation via copper wire communica-
information with the control system. can be implemented without additional tion (pilot wires or twisted telephone pair),
logic a modern communication converter for
Units featuring IEC 60870-5-103 interfaces Signaling for directional ground(earth)- copper cables is available. This operates
can be connected to SICAM in parallel via fault protection directional compari- with both the two-wire and three-wire
the RS485 bus or radially by fiber-optic son for high-resistance faults in solidly copper connections which were used by
link. Through this interface, the system is earthed systems conventional differential protection sys-
open for the connection of units of other tems before. The communication con-
Echo function
manufacturers (see Fig. 7/57). verter for copper cables is designed for
Interclose command transfer with the
5 kV insulation voltage. An additional
Because of the standardized interfaces, auto-reclosure Adaptive dead time
20 kV isolation transformer can extend the
SIPROTEC units can also be integrated (ADT) mode
field of applications of this technique into
into systems of other manufacturers or in 28 remote signals for fast transfer of ranges with higher insulation voltage re-
SIMATIC. Electrical RS485 or optical in- binary signals quirements. The connection via FO cable
terfaces are available. The optimum physi- Flexible utilization of the communication to the relay is interference-free. With
cal data transfer medium can be chosen channels by means of the programmable SIPROTEC 4 and the communication con-
thanks to opto-electrical converters. Thus, CFC logic verter for copper cables a digital follow-up
the RS485 bus allows low-cost wiring in
The protection data interfaces have differ- technique is available for two-wire protec-
the cubicles and an interference-free opti-
7 cal connection to the master can be estab- ent options to cover new and existing com- tion systems (typical 15 km) and all
munication infrastructures. three-wire protection systems using exist-
lished.
ing copper communication links.
For IEC 61850, an interoperable system so- FO51), OMA12) module:
820 nm fiber-optic interface with clock Different communication converters are
lution is offered with SICAM PAS. Via the
recovery/ST connectors for direct con- listed under "Accessories".
100 Mbits/s Ethernet bus, the units are
linked with PAS electrically or optically to nection with multi-mode FO cable up to Communication data:
the station PC. The interface is standard- 1.5 km for the connection to a commu-
ized, thus also enabling direct connection nication converter. 32-bit CRC-check according to CCITT
of units of other manufacturers to the FO61), OMA22) module: and ITU
Ethernet bus. With IEC 61850, however, 820 nm fiber-optic interface/ST connec- Each protection relay possesses a unique
the units can also be used in other manu- tors for direct connection up to 3.5 km relay address
facturers' systems (see Fig. 7/58). with multi-mode FO cable. Continuous communication link super-
vision: Individual faulty data telegrams
Via modem and service interface, the pro- do not constitute an immediate danger,
New fiber-optic interfaces, series FO1x
tection engineer has access to the protec- if they occur only sporadically. The sta-
tion devices at all times. This permits FO171): For direct connection tistical availability, per minute and hour,
remote maintenance and diagnosis (cyclic up to 24 km3), 1300 nm, for mono-mode of the serial protection data interface can
testing). fiber 9/125 m, LC-Duplex connector be displayed.
Parallel to this, local communication is FO181): For direct connection up to Supported network interfaces X21/RS422
possible, for example, during a major in- 60 km3), 1300 nm, for mono-mode fiber with 64 or 128 or 512 kbit/s; or G703-
spection. 9/125 m, LC-Duplex connector 64 kbit/s and G703-E1 (2,048 kbit/s) or
FO191): For direct connection up to G703-T1 (1,554 kbit/s).
Serial protection data interface 100 km3), 1550 nm, for mono-mode Max. channel delay time 0.1 ms to 30 ms
(R2R interface) fiber 9/125 m, LC-Duplex connector (in steps of 0.1 ms)
As an option, the 7SD52/53 provides one Protocol HDLC
or two protection data interfaces to cover
two up to six line end applications in ring
or chain topology and hot standby com-
munication between two line ends.
3) For surface-mounting housing the internal

1) For flush-mounting housing. FO module OMA1 will be delivered
2) For surface-mounting housing. together with an external repeater.

Communication
Communication possibilities between relays
Fig. 7/64 Fig. 7/65

Direct optical link up to 1.5 km/3.5 km, 820 nm Direct optical link up to 25/60 km with 1300 nm
or up to 100 km with 1550 nm
Fig. 7/66 Fig. 7/67

Connection to a communication network CC-XG Connection to a communication network CC-2M
Fig. 7/68
Connection to a pilot wire

Typical connection
Typical connection for current

and voltage transformers
3 phase current transformers with neutral
point in the line direction, I4 connected as
summation current transformer (=3I0):
Holmgreen circuit
3 voltage transformers, without connection
of the broken (open) delta winding on the
line side; the 3V0 voltage is derived inter-
nally.
Note:
Voltage inputs are always available in the
relay. But there is no need to connect it to
voltage transformers for the differential
protection function.
Fig. 7/69
Example of connection for current and voltage transformers
Alternative current measurement

The 3 phase current transformers are con-
7 nected in the usual manner. The neutral
point is in line direction. I4 is connected to
a separate neutral core-balance CT, thus
permitting a high sensitive 3I0 measure-
ment.
Note: Terminal Q7 of the I4 transformer
must be connected to the terminal of the
core-balance CT pointing in the same di-
rection as the neutral point of the phase
current transformers (in this case in line
direction). The voltage connection is ef-
fected in accordance with Fig. 7/69, 7/74
or 7/75.
Fig. 7/70
Alternative connection of current transformers for sensitive
ground(earth)-current measuring with core-balance current transformers

Typical connection
Alternative current connection

point in the line direction, I4 connected to
a current transformer in the neutral point
of a grounded (earthed) transformer for
directional ground(earth)-fault protection.
The voltage connection is effected in ac-
cordance with Fig. 7/69, 7/74 or 7/75.
Fig. 7/71 Alternative connection of current transformers for measuring

neutral current of a grounded (earthed) power transformer
Alternative current connection

point in the line direction, I4 connected to
the summation current of the parallel line
for parallel line compensation on overhead 7
lines. The voltage connection is effected in
accordance with Fig. 7/69, 7/74 or 7/75.
Fig. 7/72 Alternative connection of current transformers for measuring

the ground (earth) current of a parallel line
Fig. 7/73 Connection of current transformer with

restricted earth-fault protection (REF)

Typical connection
Alternative voltage connection

3 phase voltage transformers, V4 connected
to broken (open) delta winding (Ven) for
additional summation voltage monitoring
and ground(earth)-fault directional pro-
tection. The current connection is effected
in accordance with Fig. 7/69, 7/70, 7/71
and 7/72.
Fig. 7/74 Alternative connection of voltage transformers for measuring the

displacement voltage (e-n voltage)
Alternative voltage connection

3 phase voltage transformers, V4 connected
to busbar voltage transformer for synchro-
check.
7
Note: Any phase-to-phase or phase-to-
ground(earth) voltage may be employed as
the busbar voltage. Parameterization is car-
ried out on the unit. The current connec-
tion is effected in accordance with
Fig. 7/69, 7/70, 7/71 and 7/72.
Fig. 7/75 Alternative connection of voltage transformers for measuring the

busbar voltage

Technical data
General unit data LEDs

Analog inputs Quantity
Rated frequency 50 or 60 Hz (selectable) RUN (green) 1
Rated current IN 1 or 5 A (selectable, controlled by ERROR (red) 1
firmware) Indication (red), function can be 14
Rated voltage 80 to 125 V (selectable) assigned
Power consumption Unit design
In CT circuits with IN = 1 A Approx. 0.05 VA Housing 7XP20 See dimension drawings, part 17
In CT circuits with IN = 5 A Approx. 0.30 VA 1/2 x 19 or 1/1 x 19
In VT circuits Approx. 0.10 VA
Degree of protection acc. to EN 60529
Thermal overload capacity Surface-mounting housing IP 51
In CT circuits (for IN = 5A) 100 x IN for 1 s Flush-mounting housing
30 x IN for 10 s Rear IP 50
4 x IN continuous Front IP 51
In VT circuits 230 V, continuous per phase For the terminals IP 20 with terminal cover put on
Dynamic overload capacity Weight
In CT circuits 250 x IN (one half cycle) Flush-mounting housing
In the CT circuit for high sensitive 1/2 x 19 6 kg
earth-fault protection 1/1 x 19 10 kg
(refer to ordering code) Surface-mounting housing
Auxiliary voltage 1/2 x 19 11 kg
1/1 x 19 19 kg
Rated voltage 24 to 48 V DC
60 to 125 V DC 1)
110 to 250 V DC 1) Serial interfaces (front of unit)
and 115 V AC with 50/60 Hz1)
Operating interface 1 for DIGSI 4 or browser 7
Permissible tolerance -20 % to +20 %
Connection Front panel, non-isolated, RS232,
Max. superimposed AC voltage 15 % 9-pin subminiature connector
(peak-to-peak)
Baud rate 4800 to 115200 baud
Power consumption
Time synchronization (rear of unit)
During normal operation Approx. 8 W
During pickup with all inputs Approx. 18 W IRIG-B/DCF77/SCADA or 1 sec pulse from GPS (format IRIG-B000)
and outputs activated Connection 9-pin subminiature connector
Bridging time during auxiliary (SUB-D)
voltage failure Vaux 110 V 50 ms Voltage levels 5 or 12 or 24 V
Binary inputs Dielectric test 500 V/50 Hz
Quantity 8 or 16 or 24 Service interface (operating interface 2) for DIGSI 4 / modem / service
Function can be assigned
Isolated RS232/RS485 9-pin subminiature connector
Minimum permissible voltage 17 or 73 or 154 V DC, bipolar Dielectric test 500 V/50 Hz
Range is selectable with jumpers (3 operating ranges) Distance for RS232 Max. 15 m
for each binary input Distance for RS485, depends on Max. 1000 m
Maximum permissible voltage 300 V DC the baud rate
Current consumption, energized Approx. 1.8 mA Fiber-optic Integrated ST connector
Optical wavelength = 820 nm
Output relays
Permissible attenuation Max. 8 dB for glass-fiber 62.5/125 m
Quantity 16 or 24 or 32 Distance Max. 1.5 km
Function can be assigned
System interface
Switching capacity
(refer to ordering code) IEC 61850 Ethernet
Make 1000 W /VA
IEC 60870-5-103
Break 30 VA
PROFIBUS-FMS
Break (for resistive load) 40 W
PROFIBUS-DP
Break (for = L/R 50 ms) 25 VA
DNP 3.0
Switching voltage 250 V
Isolated RS232/RS485 9-pin subminiature connector
Permissible current 30 A for 0.5 s Baud rate 4800 to 38400 baud
5 A continuous Dielectric test 500 V/50 Hz
Distance for RS232 Max. 15 m
Distance for RS485 Max. 1000 m
1) Ranges are settable by means of jumpers.

Technical data
System interface, continued External communication converter 7XV5662-0AC00 for pilot wires
PROFIBUS RS485 External communication converter
Dielectric test 500 V/50 Hz to interface between relays, optical
Baud rate Max. 12 Mbaud 820 nm interface and a pilot wire or
Distance 1 km at 93.75 kB; 100 m at 12 MB twisted telephone pair.
PROFIBUS fiber-optic2) Typical distance 15 km
Only for flush-mounting housing ST connector Fiber-optic 820 nm with clock Max. 1.5 km with 62.5/125 m
For surface-mounting housing Optical interface with OLM2) recovery multi-mode FO cable
Baud rate Max. 1.5 Mbaud
Optical wavelength = 820 nm Pilot wire Screw-type terminal 5 kV isolated
Permissible attenuation Max. 8 dB for glass-fiber 62.5/125 m Permissible time delay (duration of data transmission)
Distance 500 kB/s 1.6 km, 1500 kB/s 530 m
Delay of telegrams due to trans- Max. 30 ms per transmission path
Protection data interface (R2R interface) mission for one unit to the other. Permissible max. value can be
FO51), OMA12): Fiber-optic interface For multi-mode fiber 62.5/125 m, Delay is constantly measured and selected
with clock recovery for direct connec- ST connectors adjusted
tion up to 1.5 km or for connection to Permissible fiber attenuation 8 dB
a communication converter, 820 nm
Electrical tests
FO61), OMA22): Fiber-optic interface For multi-mode fiber 62.5/125 m,
Specifications
for direct connection up to 3.5 km, ST connectors
820 nm Permissible fiber attenuation 16 dB Standards IEC 60255 (product standards)
ANSI/IEEE C37.90.0/.1/.2
New fiber-optic interfaces, series FO1x
UL 508
FO171): for direct connection up to For mono-mode fiber 9/125 m, For further standards see
24 km3), 1300 nm LC-Duplex connector Individual functions
Permissible fiber attenuation 13 dB
Insulation tests
FO181): for direct connection up to For mono-mode fiber 9/125 m,
7 60 km3), 1300 nm LC-Duplex connector
Standards IEC 60255-5
Permissible fiber attenuation 29 dB Voltage test (100 % test)
All circuits except for auxiliary 2.5 kV (r.m.s.), 50/60 Hz
FO191): for direct connection up to For mono-mode fiber 9/125 m,
supply, binary inputs and
100 km3), 1550 nm LC-Duplex connector
communication interfaces
Permissible fiber attenuation 29 dB
Auxiliary voltage and binary 3.5 kV DC
Relay communication equipment
inputs (100 % test)
External communication converter 7XV5662-0AA00
RS485/RS232 rear side communi- 500 V (r.m.s.), 50/60 Hz
for communication networks X21/G703-64 kbit/s
cation interfaces and time
External communication converter to synchronization interface
interface between the relays, optical (100 % test)
820 nm interface and the X21(RS422)
G703-64 kbit/s interface of a commu- Impulse voltage test (type test)
nication device All circuits except for communi- 5 kV (peak); 1.2/50 s; 0.5 J
cation interfaces and time syn- 3 positive and 3 negative impulses at
X21/G703, RS422 selectable by jump- chronization interface, class III intervals of 5 s
ers. Baud rate selectable by jumpers
EMC tests for noise immunity; type tests
Input: fiber-optic 820 nm Max. 1.5 km with 62.5/125 m
with clock recovery multi-mode FO cable to device side Standards IEC 60255-6, IEC 60255-22
(product standards) (type tests)
Output: X21 (RS422) electrical 64/128/512 kbit (selectable by jumper) EN 50082-2 (generic standard)
interface on communication device max. 800 m, 15-pin connector DIN 57435 part 303
G703-64 kbit/s electrical interface on 64 kbit/s, max. 800 m, screw-type High frequency test 2.5 kV (peak); 1 MHz; = 15 ms;
communication device terminal IEC 60255-22-1, class III and 400 surges per s;
External communication converter 7XV5662-0AD00 VDE 0435 part 303, class III test duration 2 s
for communication networks with G703-E1 or G703-T1 Electrostatic discharge 8 kV contact discharge; 15 kV air
External communication converter to IEC 60255-22-2, class IV discharge; both polarities; 150 pF;
interface between the relays, optical EN 61000-4-2, class IV Ri = 330
820 nm interface and G703-E1 or Irradiation with RF field, 10 V/m; 27 to 500 MHz
G703-T1 interface of a communica- non-modulated
tion network. IEC 60255-22-3 (report), class III
Inputs: 2 fiber-optic inputs 820 nm, Max. 1.5 km with 62.5/125m Irradiation with RF field, 10 V/m; 80 to 1000 MHz;
1RS232 input multi-mode 1 FO cable to device side amplitude-modulated 80 % AM; 1 kHz
Output: IEC 61000-4-3, class III
G703.5 E1: 2,048 kbit/s
G703.6 T1: 1,554 kbit/s
Electrical interface on communica- max. 800 m, screw-type terminal
tion network 1) For flush-mounting housing.
2) For surface-mounting housing.
3) For surface-mounting housing the internal FO module OMA1
will be delivered together with an external repeater.

Technical data
Irradiation with RF field, 10 V/m; 900 MHz; repetition During transport

pulse-modulated IEC 61000-4-3/ frequency 200 Hz; duty cycle 50 % Standards IEC 60255-21 and IEC 60068-2
ENV 50204, class III
Vibration Sinusoidal
Fast transients, bursts 4 kV; 5/50 ns; 5 kHz; IEC 60255-21-1, class 2 5 to 8 Hz: 7.5 mm amplitude;
IEC 60255-22-4 and burst length = 15 ms; IEC 60255-2-6 8 to 150 Hz: 2 g acceleration
IEC 61000-4-4, class IV repetition rate 300 ms; frequency sweep 1 octave/min
both polarities; Ri = 50 ; 20 cycles in 3 orthogonal axes
test duration 1 min
Shock Half-sinusoidal
High-energy surge voltages (SURGE) IEC 60255-21-2, class 1 Acceleration 15 g, duration 11 ms,
IEC 61000-4-5, installation class III IEC 60068-2-27 3 shocks each in both directions
Auxiliary supply Common mode: 2 kV, 12 , 9 F of the 3 axes
Differential mode: 1 kV; 2 , 18 F
Continuous shock Half-sinusoidal
Measurements inputs, binary inputs, Common mode: 2 kV, 42 , 0.5 F IEC 60255-21-2, class 1 Acceleration 10 g, duration 16 ms,
binary outputs Differential mode: 1 kV; 42 , 0.5 F IEC 60068-2-29 1000 shocks each in both directions
Line-conducted HF, amplitude-mod- 10 V; 150 kHz to 80 MHz; 80 % AM; of the 3 axes
ulated, IEC 61000-4-6, class III 1 kHz
Magnetic field with power frequency 30 A/m continuous; 300 A/m for 3 s; Climatic stress tests
IEC 61000-4-8, class IV; 50 Hz; 0.5 mT; 50 MHz
IEC 60255-6 Temperatures
Oscillatory surge withstand capability 2.5 to 3 kV (peak); 1 to 1.5 MHz Type-tested acc. to IEC 60068-2-1 -25 C to +85 C / -13 F to +185 F
ANSI/IEEE C37.90.1 Damped wave; 50 surges per second; and -2, test Bd, for 16 h
Duration 2 s; Ri = 150 to 200 Temporarily permissible operating -20 C to +70 C / -4 F to +158 F
Fast transient surge withstand 4 to 5 kV; 10/150 ns; 50 surges temperature, tested for 96 h
capability, ANSI/IEEE C37.90.1 per second; Recommended permanent operating -5 C to +55 C / +25 F to +131 F
both polarities; duration 2 s; Ri = 80 temperature acc. to IEC 60255-6
Radiated electromagnetic interfer- 35 V/m; 25 to 1000 MHz (Legibility of display may be im- 7
ence, IEEE C37.90.2 amplitude and pulse-modulated paired above +55 C / +131 F)
Limiting temperature during -25 C to +55 C / -13 F to 131 F
Damped oscillations IEC 60894, 2.5 kV (peak value), polarity permanent storage
IEC 61000-4-12 alternating 100 kHz Limiting temperature during -25 C to +70 C / -13 F to +158 F
1, 10 and 50 MHz, Ri = 200 transport
EMC tests for interference emission; type tests Humidity
Standard EN 50081-* (generic standard) Permissible humidity stress Yearly average 75 % relative humid-
Conducted interference voltage on 150 kHz to 30 MHz It is recommended to arrange the ity; on 56 days in the year up to 93 %
lines, only auxiliary supply, Limit class B units in such a way, that they are not relative humidity; condensation is not
IEC-CISPR 22 exposed to direct sunlight or pro- permitted
Radio interference field strength 30 to 1000 MHz nounced temperature changes that
IEC-CISPR 22 Limit class B could cause condensation.
Mechanical dynamic tests Functions
Vibration, shock stress and seismic vibration Differential protection (ANSI 87L, 87T)
During operation Sensitive normal trip stage IDiff>
Standards IEC 60255-21 and IEC 60068-2 Setting range of

IDiff > secondary 1 A 0.1 to 20 A (step 0.1)
Vibration Sinusoidal secondary 5 A 0.5 to 100 A
IEC 60255-21-1, class 2 10 to 60 Hz: 0.075 mm amplitude;
IEC 60068-2-6 60 to 150 Hz: 1 g acceleration Tripping time (three line ends) 50 Hz
frequency sweep 1 octave/min IDiff > 2.5 IDiff > (setting) Min. 27 ms
20 cycles in 3 othogonal axes Typ. 29 ms
60 Hz
Shock Half-sinusoidal Min. 24 ms
IEC 60255-21-2, class 1 acceleration 5 g, duration 11 ms, Typ. 26 ms
IEC 60068-2-27 3 shocks each in both directions
of the 3 axes Delay time of IDiff> trip stage
Seismic vibration Sinusoidal Delay time 0 to 60 s (step 0.01 s)
IEC 60255-21-2, class 1 1 to 8 Hz: 3.5 mm amplitude Capacitive current load compensation
IEC 60068-3-3 (horizontal axis),
Restraint ratio
1 to 8 Hz: 1.5 mm amplitude
IC STAB / ICN 2 to 4 (steps 0.1)
(vertical axis),
8 to 35 Hz: 1 g acceleration High-set fast trip stage IDiff>>
(horizontal axis), Setting range
8 to 35 Hz: 0.5 g acceleration IDiff>> secondary 1 A 0.8 to 100 A (step 0.1)
(vertical axis), secondary 5 A 4 to 500 A (step 0.5)
frequency sweep 1 octave/min
1 cycle in 3 orthogonal axes Tripping time (three line ends) Min. 9 ms1)
IDiff 2.5 IDiff >> (setting) Typ. 12 ms1)
1) Ordering option with high-speed contacts required.
Technical data
Vector group adaptation with transformers in the differential zone Ground(earth)-fault pickup
Adaptation of connection symbol 0 to 11 (x 30 ) (step 1) Neutral (residual) current 3I0 0.05 to 4 A (1A)/ 0.25 to 20 A (5A)
(Ground current) (step 0.01 A)
Neutral point connection Grounded (earthed) or not grounded
(earthed) (for each winding) Zero-sequence voltage 3V0>
for earthed networks 1 to 100 V (step 1 V) or deactivated
Inrush restraint for resonant-earthed networks 10 to 200 V (step 1 V)
Restraint ratio Zero-sequence compensation
2nd harmonic I2fN/IfN 10 % to 45 % (step 1 %) Selectable input formats RE/RL and XE/XL
Max. current for restraint 1.1 A to 25 A1) (step 0.1 A) k0 and (k0)
Crossblock function Can be switched on and off Separately selectable for zones Z1
higher zones (Z1B, Z2 to Z5)
Max. operative time for crossblock 0 to 60 s (step 0.01 s) or
Toper crossblk deactivated (operating up to release) RE/RL and XE/XL -0.33 to 7 (step 0.01)
Distance protection (ANSI 21, 21N) k0 0 to 4 (step 0.001)
(k0) -135 to 135 (step 0.01 )
Distance protection zones 6, 1 of which as controlled zone, all
zones can be set forward or/and Parallel line mutual compensation (refer to ordering code)
reverse RM/RL and XM/XL 0.00 to 8 (step 0.01)
Time stages for tripping delay 6 for multi-phase faults Phase reference on double Phase preference or no preference
3 for single-phase faults earth-faults in resonant-earthed/ (selectable)
Setting range 0 to 30 s or deactivated (steps 0.01 s) non-earthed network
Characteristic (refer to ordering code) Load encroachment
Selectable separately for phase quadrilateral and/or Minimum load resistance 0.10 to 600 (1A) / 0.02 to 120 (5A)
and ground (earth) faults Mho (only impedance pickup) (step 0.001 ) or deactivated
Types of pickup Overcurrent pickup (I>); Maximum load angle 20 to 60 (step 1 )
Voltage-dependent overcurrent Directional decision for all types of With sound phase polarization and/or
7 pickup (V); faults voltage memory
Voltage-dependent and phase an-
gle-dependent overcurrent pickup Directional sensitivity Dynamically unlimited
(V / >); Tolerances For sinusodial quantities
Impedance pickup (Z<) Impedances
X
Types of tripping Three-pole for all types of faults; (in conformity with DIN 57435, 5 % for 30 SC 90
Part 303) X
Single-pole for single-phase faults /
otherwise three-pole; R
5 % for 0 SC 60
Single-pole for single-phase faults and R
two-pole phase-to-phase faults /
otherwise three-pole Z
5% for-30 ( SC -line)+30
Time range 0 to 30 s (step 0.01 s) or deactivated Z
Line angle L 30 to 89 (step 1 ) Response values (in conformity
with DIN 57435, Part 303)
Inclination angle for quadrilateral 30 to 90 (step 1)
V and I 5 % of setting value
characteristic
Angle () 3
Quadrilateral reactance reach X 0.05 to 600 (1A) / 0.01 to 120 (5A)
Timer tolerance 1 % of set value or 10 ms
(step 0.001 )
Quadrilateral resistance reach R
for phase-to-phase faults and 0.05 to 600 (1A) / 0.01 to 120 (5A)
phase-to-ground(earth) faults (step 0.001) Operating times
Mho impedance reach ZR 0.05 to 200 (1A) / 0.01 to 40 (5A) Minimum trip time Approx. 17 ms at 50 Hz
(step 0.01 ) with fast relays Approx. 15 ms at 60 Hz
Minimum trip time Approx. 12 ms at 50 Hz
Minimum phase current I 0.05 to 4 A (1A) / 0.25 to 20 A (5A)
with high-speed relays Approx. 10 ms at 60 Hz
(step 0.01 A)
Reset time Approx. 30 ms
Overcurrent pickup I>> 0.25 to 10 A (1A) / 1.25 to 50 A (5A)
(for I>>, V, V/>) (step 0.01 A)
Minimum current pickup I> 0.05 to 4 A (1A) / 0.25 to 20 A (5A)
(for V, V/> and Z<) (step 0.01 A)
Minimum current pickup I> 0.1 to 8 A (1A) / 0.5 to 40 A (5A)
(for V, V/>) (step 0.01 A)
Undervoltage pickup (for V and
V/>)
Vph-e< 20 to 70 V (step 1 V)
Vph-ph< 40 to 130 V (step 1 V)
Load angle pickup (for V/>)
Load angle 30 to 80
Load angle 90 to 120
1) Secondary data for IN = 1 A; with IN = 5 A the values must be multiplied.

Technical data
Power swing detection (ANSI 68, 68T) Inverse-time stage (ANSI 51, 51N)
Power swing detection principle Measurement of the rate of imped- Phase current pickup 0.1 to 4 A (1A) /0.5 to 20 A (5A)
ance vector change and monitoring of (step 0.01 A) or deactivated
the vector path Neutral (residual) current pickup 0.05 to 4 A (1A) /0.25 to 20 A (5A)
Max. detectable power swing fre- Approx. 7 Hz (step 0.01 A) or deactivated
quency Characteristics
Operating modes Power swing blocking and/or power Characteristics Normal inverse
swing tripping (out-of-step tripping) according to IEC 60255-3 Very inverse
Power swing blocking programs All zones blocked Extremely inverse
Z1/Z1B blocked Long time inverse
Z2 to Z5 blocked Time multiplier Tp = 0.05 to 3 s (step 0.01 s)
Z1, Z1B, Z2 blocked or deactivated
Detection of faults during power Reset of power swing blocking for all Pickup threshold Approx. 1.1 x I / Ip
swing blocking types of faults
Reset threshold Approx. 1.05 x I / Ip
Tele (pilot) protection for distance protection (ANSI 85-21)
Tolerances
Modes of operation PUTT (Z1B acceleration); DUTT Operating time for 2 I/Ip 20 5 % of setpoint 15 ms
PUTT (acceleration with pickup);
POTT; Directional comparison; Characteristics Inverse
Reverse interlocking according to ANSI/IEEE Short inverse
Pilot-wire comparison; Unblocking; Long inverse
Blocking Moderately inverse
Very inverse
Additional functions Echo function Extremely inverse
(refer to weak-infeed function) Definite inverse
Transient blocking for schemes with
measuring range extension Time dial 0.5 to 15 (step 0.01) or deactivated
Transmission and reception signals Phase-selective signals available for Pickup threshold Approx. 1.1 x M 7
maximum selectivity with single-pole Reset threshold Approx. 1.05 x M
tripping; signals for 2 and 3-end-
Tolerances
lines
Operating time for 2 M 20 5 % of setpoint 15 ms
Direct transfer trip (DTT)
Instantaneous high-speed switch-onto-fault overcurrent protection
Direct phase-selective tripping via Alternatively with or without (ANSI 50HS)
binary input auto-reclosure
Operating mode Active only after c.b. closing;
Trip time delay 0 to 30 s (step 0.01 s) or deactivated instantaneous trip after pickup
Timer tolerance 1 % of setting value or 10 ms Characteristic 2 definite-time stages
Backup overcurrent protection (ANSI 50N, 51N) Pickup current I >>> 0.1 to 15 A (1A) /0.5 to 75 A (5A)
Operating modes Active only with loss of data (step 0.01 A) or deactivated
connection and voltage or always Pickup current I >>>> 1 to 25 A (1A)/5 to 125 A (5A)
active (step 0.01 A) or deactivated
Characteristics 3 definite-time stages / 1 inverse-time Reset ratio Approx. 0.95
stage
Tolerances < 3 % of set value or 1 % of IN
Definite-time stage (ANSI 50, 50N )
Directional ground (earth)-fault overcurrent protection
Pickup definite time stage 1, 0.1 to 25 A (1A) / 0.5 to 125 A (5A) for high-resistance faults in systems with earthed star point
phase current (step 0.01 A) or deactivated (ANSI 50N, 51N, 67N)
Pickup definite-time stage 1, 0.5 to 25 A (1A) / 0.25 to 125 A (5A) Characteristic 3 definite-time stages / 1 inverse-time
neutral (residual) current (step 0.01 A) or deactivated stage or 4 definite-time stages or
Pickup definite-time stage 2, 0.1 to 25 A (1A) / 0.5 to 125 A (5A) 3 definite-time stages / 1 V0invers. stage
phase current (step 0.01 A) or deactivated Phase selector Permits 1-pole tripping for single-
Pickup definite-time stage 2, 0.05 to 25 A (1A) / 0.25 to 125 A (5A) phase faults or 3-pole tripping for
neutral (residual) current (step 0.01 A) or deactivated multi-phase faults
Pickup definite-time stage 3, 0.1 to 25 A (1A) / 0.5 to 125 A (5A) Inrush restraint Selectable for every stage
phase current (step 0.01 A) or deactivated Instantaneous trip after Selectable for every stage
Pickup definite-time stage 3, 0.05 to 25 A (1A) / 0.25 to 125 A (5A) switch-onto-fault
neutral (residual) current (step 0.01 A) or deactivated Influence of harmonics
Time delay for definite-time stages 0 to 30 s, (step 0.01 s) or deactivated Stages 1 and 2 (I>>> and I>>) 3rd and higher harmonics are com-
pletely suppressed by digital filtering
Tolerances
Current pickup 3 % of set value or 1 % of IN Stages 3 and 4 2nd and higher harmonics are com-
Delay times 1 % of set value or 10 ms (I> and inverse 4th stage) pletely suppressed by digital filtering
Operating time Approx. 25 ms

Technical data
Definite-time stage (ANSI 50N) Zero-sequence voltage protection V0inverse

Pickup value 3I0>>> 0.5 to 25 A (1A) / 2.5 to 125 A (5A)
2s
(step 0.01 A) Tripping characteristic t =
V0
Pickup value 3I0>> 0.2 to 25 A (1A) / 1 to 125 A (5A) V 0inv min
4
(step 0.01 A)
Pickup value 3I0> 0.05 to 25 A (1A) / 0.25 to 125 A (5A) Direction decision (ANSI 67N)
(step 0.01 A)
Neutral (residual) current transformer Measured signals for direction deci- 3I0 and 3V0 or
with normal sensitivity sion 3I0 and 3V0 and IY (star point current
(refer to ordering data, position 7); of an earthed power transformer) or
0.003 to 25 A (1A) / 0.015 to 125 A (5A) 3I2 and 3V2 (negative-sequence
(step 0.001 A) system) or zero-sequence power Sr or
Neutral (residual) current transformer automatic selection of zero-sequence
with high sensitivity (refer to ordering or negative-sequence quantities de-
data, position 7) pendent on the magnitude of the com-
ponent voltages
Pickup value 3I0, 4th stage 0.05 to 25 A (1A) / 0.25 to 125 A (5A)
(step 0.01 A) Min. zero-sequence voltage 3V0 0.5 to 10 V (step 0.1 V)
Neutral (residual) current transformer Min. current IY (of grounded 0.05 to 1 A (1A) / 0.25 to 5 A (5A)
with normal sensitivity (refer to order- (earthed) transformers) (step 0.01 A)
ing data, position 7); Min. negative-sequence voltage 3V2 0.5 to 10 V (step 0.1 V)
0.003 to 25 A (1A) / 0.015 to 125 A (5A)
(step 0.001 A) Min. negative-sequence current 3I2 0.05 to 1 A (1A) / 0.25 to 5 A (5A)
Neutral (residual) current transformer (step 0.01 A)
with high sensitivity (refer to ordering Inrush current blocking, capable of being activated for each stage
data, position 7)
Component of the 2nd harmonic 10 to 45 % of the fundamental
Time delay for definite-time stages 0 to 30 s (step 0.01 s) or deactivated (step 1 %)
7 Tolerances Max. current, which cancels inrush 0.5 to 25 A (1A) / 2.5 to 125 A (5A)
Current pickup 3 % of setting value or 1 % IN current blocking (step 0.01 A)
Delay times 1 % of setting value or 10 ms
Tele (pilot) protection for directional ground(earth)-fault overcurrent
Command / pickup times 3I0>>> Approx. 30 ms protection (ANSI 85-67N)
and 3I0>>
Operating modes Directional comparison: Pickup
Command / pickup times 3I0> and Approx. 40 ms Directional comparison: Blocking
3I0, 4th stage Directional comparison: Unblocking
Inverse-time stage (ANSI 51N) Additional functions Echo (see function "weak infeed");
Ground (earth)-current pickup 3I0P 0.05 to 4 A (1A) / 0.25 to 20 A (5A) transient blocking for schemes with
(step 0.01 A) parallel lines
Neutral (residual) current transformer Transmission and reception signals Phase-selective signals available for
with normal sensitivity maximum selectivity with single-pole
(refer to ordering data, position 7) tripping; signals for 2 and 3-end-lines
0.003 to 4 A (1A) / 0.015 to 20 A (5A)
(step 0.001 A) Weak-infeed protection with undervoltage (ANSI 27WI)
Neutral (residual) current transformer Operating modes with carrier Echo
with high sensitivity (refer to ordering (signal) reception Echo and trip with undervoltage
data, position 7) Undervoltage phase ground 2 to 70 V (step 1 V)
Tripping characteristics acc. to Normal inverse; very inverse; (earth)
IEC 60255-3 extremely inverse; long inverse Time delay 0.00 to 30 s (step 0.01 s)
ANSI/IEEE tripping characteristic Inverse; short inverse; long inverse; Echo impulse 0.00 to 30 s (step 0.01 s)
(not for region DE, refer to ordering moderately inverse; very inverse; Tolerances
data, position 10) extremely inverse; definite inverse Voltage threshold 5 % of set value or 0.5 V
Inverse logarithmic tripping charac- Timer 1 % of set value or 10 ms
3I 0
teristics (not for regions DE and US, t = T3 I 0 Pmax T3 I 0 P ln Fault locator
refer to ordering data, position 10) 3 I 0p
Output of the distance to fault X, R (secondary) in
Pickup threshold 1.1 to 4.0 x I/Ip (step 0.1 s) X, R (primary) in
Time multiplier for IEC T character- Tp = 0.05 to 3 s (step 0.01 s) Distance in kilometers or in % of line
istics length
Time multiplier for ANSI D charac- DI0P = 0.5 to 15 s (step 0.01 s) Start of calculation With trip, with reset of pickup, with
teristics binary input
Pickup threshold Approx. 1.1 x I/Ip (ANSI: I/Ip = M) Reactance per unit length 0.005 to 6.5 /km(1A) / 0.001 to
1.3 /km(5A)
Inverse logarithmic pickup threshold 1.1 to 4.0 x I/I0P (step 0.1) (step 0.0001 /km)
Reset threshold Approx. 1.05 x I/I0P (ANSI: I/Ip = M) Tolerance For sinusoidal quantities
Tolerance 2.5 % line length for
Operating time for 2 I/Ip 20 5 % of setpoint 15 ms 30 SC 90 and VSC/Vnom > 0.1

Technical data
Voltage protection (ANSI 59, 27) Breaker failure protection (ANSI 50BF)
Operating modes Local tripping or only indication Number of stages 2
Overvoltage protection Pickup of current element 0.05 to 20 A(1A) / 0.25 to 100 A(5A)
(step 0.01 A)
Pickup values VPH-Gnd>>, VPH-Gnd> 1 to 170 V (step 0.1 V)
(phase-ground (earth) overvoltage) or deactivated Time delays T11phase, T13phase, T2 0 to 30 s (steps 0.01 s) or deactivated
Pickup values VPH-PH>>, VPH-PH> 2 to 220 V (step 0.1 V) Additional functions End-fault protection
(phase-phase overvoltage) or deactivated CB pole discrepancy monitoring
Pickup values 3V0>>, 3V0> Reset time Approx. 15 ms, typical; 25 ms max.
1 to 220 V (step 0.1 V)
(3V0 can be measured via V4 trans- or deactivated Tolerances
formers or calculated by the relay) Current limit value 5 % of setting value or 1 % Inom
(zero-sequence overvoltage) Time stages 1 % of setting value or 10 ms
Pickup values V1>>, V1> 2 to 220 V (step 0.1 V) Auto-reclosure (ANSI 79)
(positive-sequence overvoltage) or deactivated Number of auto-reclosures Up to 8
Measured voltage Local positive-sequence Operating mode Only 1-pole; only 3-pole, 1 or 3-pole
voltage or calculated
remote positive-sequence Operating modes with line voltage DLC dead-line check
voltage (compounding) check ADT adaptive dead time
RDT reduced dead time
Pickup values V2>>, V2> 2 to 220 V (step 0.1 V)
(negative-sequence overvoltage) or deactivated Dead times T1-ph, T3-ph, TSeq 0 to 1800 s (step 0.01 s) or deactivated
Action times 0.01 to 300 s (step 0.01 s) or deactivated
Reset ratio (settable) 0.5 to 0.98 (step 0.01)
Reclaim times 0.5 to 300 s (step 0.01 s)
Undervoltage protection
Start-signal monitoring time 0.01 to 300 s (step 0.01 s)
Pickup values VPH-Gnd<<, VPH-Gnd< 1 to 100 V (step 0.1 V)
(phase-ground (earth) undervoltage) or deactivated Additional functions Synchro-check request
Pickup values VPH-PH<<, VPH-PH< 1 to 175 V (step 0.1 V)
3-phase intertripping
InterCLOSE command
7
(phase-phase undervoltage) or deactivated to the remote end
Pickup values V1<<, V1< 1 to 100 V (step 0.1 V) Check of CB ready state
(positive-sequence undervoltage) or deactivated Blocking with manual CLOSE
Blocking of undervoltage protection Minimum current; binary input Voltage limit values for DLC, ADT,
stages RDT
Healthy line voltage 30 to 90 V (step 1 V)
Reset ratio 1.05 Dead line 2 to 70 V (step 1 V)
Time delays Tolerances
Time delay for all over- and 0 to 100 s (steps 0.01 s) or deactivated Time stages 1 % of setting value or 10 ms
undervoltage stages Voltage limit values 3 % of setting value or 0.5 V
Command / pickup time Approx. 30 ms Synchro-check (ANSI 25)
Tolerances Initiate options Auto-reclosure;
Voltage limit values 3 % of setting value or 0.5 V Manual CLOSE control
Time stages 1 % of setting value or 10 ms Control commands
Frequency protection (ANSI 81) Operating modes
with auto-reclosure Synchro-check
Number of frequency elements 4
Line dead/busbar live
Setting range 45.5 to 54.5 Hz Line live/busbar dead
(in steps of 0.01) at fnom = 50 Hz Line and busbar dead
55.5 to 64.5 Hz Bypassing
(in steps of 0.01) at fnom = 60 Hz For manual closure
Delay times 0 to 600 s or (in steps of 0.01 s) and control commands As for auto-reclosure
Operating voltage range 6 to 230 V (phase-to-ground (earth)) Permissible voltage difference 1 to 60 V (step 0.1 V)
Pickup times Approx. 80 ms Permissible frequency difference 0.03 to 2 Hz (step 0.01 Hz)
Dropout times Approx. 80 ms Permissible angle difference 2 to 80 (step 1 )
Hysteresis Approx. 20 mHz Max. duration of synchronization 0.01 to 600 s (step 0.01 s) or deactivated
Dropout condition Voltage = 0 V and current = 0 A
Release delay with synchronous 0 to 30 s (step 0.01 s)
Tolerances networks
Frequency 12 m Hz for V = 29 to 230 V
Tolerances
Delay times 1 % of the setting value or 10 ms
Time stages 1 % of setting value or 10 ms
Voltage limit values 2 % of setting value or 2 V

Technical data
Restricted earth-fault protection (ANSI 87N) Thermal overload protection (ANSI 49)
Multiple availability 2 times (option) Setting ranges
Factor k acc. to IEC 60255-8 1 to 4 (steps 0.01)
Settings
Time constant 1 to 999.9 min (steps 0.1 min)
Differential current IREF >/INobj 0.05 to 2.00 (steps 0.01)
Temperature alarm stage alarm/trip 50 to 100 % in relation to the trip
Limit angle REF 110 (fixed) temperature
Time delay TREF 0.00 to 60.00 s (steps 0.01 s) Current alarm stage Ialarm
or deactivated (no trip) Secondary 1 A 0.1 to 4 A (step 0.1)
The set times are pure delay times Secondary 5 A 0.5 to 20 A (step 0.1)
Operating times
I 2 I pre
2
Pickup time (in ms) at frequency 50 Hz 60 Hz Trip time characteristic t = ln
I 2 (k I N )
2
At 1.5 setting value IREF >, approx. 30 25 Reset ratios

At 2.5 setting value IREF >, approx. 28 24 / alarm Approx. 0.99
Dropout time (in ms), approx. 26 23 / trip Approx. 0.99
Dropout ratio, approx. 0.7 I / Ialarm Approx. 0.99
Overcurrent-time protection for phase and residual currents Tolerances Class 10 % acc. to IEC
Multiple availability 3 times (option) Trip circuit supervision (ANSI 74TC)
Characteristics Number of supervisable trip circuits Up to 3
Definite-time stages (DT) IPh >>, 3I0 >>, IPh >, 3I0 > Number of required binary inputs 1 or 2
Inverse-time stages (IT) IP, 3I0P per trip circuit
Acc. to IEC Inverse, very inverse, extremely Indication relay 1 to 30 s (step 1 s)
inverse, long-time inverse
Acc. to ANSI Inverse, moderately inverse, very
Additional functions
7 inverse, extremely inverse, definite
inverse, short inverse, long inverse Operational measured values
Alternatively, user-specified Representation Primary, secondary and percentage
trip and reset characteristics referred to rated value
Reset characteristics (IT) Acc. to ANSI with disk emulation Currents 3 x IPhase; 3I0; IGnd sensitve; I1; I2; IY;
Current stages 3I0PAR
3 x IDiff, 3 x IStab
High-current stages IPh >> 0.10 to 35.00 A 1) (steps 0.01 A)
or deactivated (stage ineffective) Tolerances 0.5 % of indicated measured value
TIPh >> 0.00 to 60.00 s (steps 0.01 s) or 0.5 % Inom
or deactivated (no trip) Voltages 3 x VPhase-Ground; 3 x VPhase-Phase; 3V0,
3I0 >> 0.05 to 35.00 A 1) (steps 0.01 A) V1, V2, VSYNC, Ven , VCOMP
or deactivated (stage ineffective) Tolerances 0.5 % of indicated measured value
T3I0 >> 0.00 to 60.00 s (steps 0.01 s) or 0.5 % Vnom
or deactivated (no trip) Power with direction indication P, Q, S
Definite-time stages IPh > 0.10 to 35.00 A 1) (steps 0.01 A)
Tolerances
or deactivated (stage ineffective)
P: for cos = 0.7 to 1 and Typical 1 %
TIPh 0.00 to 60.00 s (steps 0.01 s) V/Vnom, I/Inom = 50 to 120 %
or deactivated (no trip) Q: for sin = 0.7 to 1 and Typical 1 %
3I0 > 0.05 to 35.00 A 1) (steps 0.01 A) V/Vnom , I/Inom = 50 to 120 %
or deactivated (stage ineffective) S: for V/Vnom, I/Inom = 50 to Typical 1 %
T3I0 > 0.00 to 60.00 s (steps 0.01 s) 120 %
or deactivated (no trip) Frequency f
Inverse-time stages IP 0.10 to 4.00 A 1) (steps 0.01 A) Tolerance 20 mHz
Acc. to IEC TIP 0.05 to 3.20 s (steps 0.01 s) Power factor PF (cos )
or deactivated (no trip)
Tolerance for cos = 0.7 to 1 Typical 3 %
3I0P 0.05 to 4.00 A 1) (steps 0.01 A)
Load impedances with directional 3 x RPhase-Ground, XPhase-Ground
T3I0P 0.05 to 3.20 s (steps 0.01 s) indication 3 x RPhase-Phase, XPhase-Phase
or deactivated (no trip)
Overload measured values /Trip L1; /Trip L2; /Trip L3;
Inverse-time stages IP 0.10 to 4.00 A 1) (steps 0.01 A)
/Trip
Acc. to ANSI DIP 0.50 to 15.00 s (steps 0.01 s)
or deactivated (no trip) Long-term mean values
3I0P 0.05 to 4.00 A 1) (steps 0.01 A) Interval for derivation of mean value 15 min / 1 min; 15 min / 3 min;
15 min / 15 min
D3I0P 0.50 to 15.00 s (steps 0.01 s)
or deactivated (no trip) Synchronization instant Every hour; every hour; every
hour
Values 3 x IPhase; I1; P; P+; P-; Q; Q+; Q; S

Technical data
Minimum/maximum memory Further additional functions
Indication Measured values with date and time Measurement supervision Current sum
Resetting Cyclically Current symmetry
Via binary input Voltage sum
Via the keyboard Voltage symmetry
Via serial interface Voltage phase sequence
Fuse failure monitor
Values
Min./max. of measured values 3 x IPhase; I1; 3 x VPhase-Ground; 3 x Annunciations
VPhase-to-phase; 3V0; V1; Event logging Buffer size 200
P+; P; Q+; Q; S; f; power factor Fault logging Storage of signals of the last 8 faults,
(+); power factor () buffer size 800
Min./max. of mean values 3 x IPhase; I1; P; Q; S Switching statistics Number of breaking operations per
Energy meters c.b. pole
Sum of breaking current per phase
Four-quadrant meters WP+; WP; WQ+; WQ Breaking current of last trip operation
Tolerance Max. breaking current per phase
for cos > 0.7 and V > 50 % 5% Circuit-breaker test TRIP/CLOSE cycle 3-phase
Vnom and I> 50 % Inom TRIP/CLOSE cycle per phase
Oscillographic fault recording Setting range 0.00 to 30 s (step 0.01 s)
Analog channels 3 x IPhase, 3I0, 3I0PAR, 3I0 Gnd sensitive, Dead time for CB TRIP/CLOSE 0.00 to 30 s (step 0.01 s)
3 x IDiff, 3 x IStab cycle
3 x VPhase, 3V0, VSYNC, Ven, Vx Commissioning support Operational measured values
Max. number of available recordings 8, backed-up by battery if auxiliary Circuit-breaker test
voltage supply fails Read binary test
Initiate binary inputs
Sampling intervals 20 samplings per cycle
Set binary outputs
Total storage time Approx. 15 s Set serial interface outputs 7
Binary channels Pickup and trip information; number Lockout of a device
and contents can be freely configured Test mode ot the differential
by the user protection topology
Max. number of displayed binary 40
channels CE conformity
Control This product is in conformity with the Directives of the European Commu-
Number of switching units Depends on the number of binary / nities on the harmonization of the laws of the Member States relating to
indication inputs and indication / electromagnetic compatibility (EMC Council Directive 89/336/EEC) and
command outputs electrical equipment designed for use within certain voltage limits (Council
Directive 73/23/EEC).
Control commands Single command / double command
1, 1 plus 1 common or 2 pole This unit conforms to the international standard IEC 60255, and the Ger-
man standard DIN 57435/Part 303 (corresponding to VDE 0435/Part 303).
Feed back CLOSE, TRIP, intermediate position
Further applicable standards: ANSI/IEEE C37.90.0 and C37.90.1.
Interlocking Freely configurable
The unit has been developed and manufactured for application in an indus-
Local control Control via menu, function keys trial environment according to the EMC standards.
Remote control Control protection, DIGSI, pilot This conformity is the result of a test that was performed by Siemens AG in
wires accordance with Article 10 of the Council Directive complying with the
generic standards EN 50081-2 and EN 50082-2 for the EMC Directive and
standard EN 60255-6 for the low-voltage Directive.

Selection and ordering data Description Order No. Order

code
7SD5 multi-end differential protection relay 7SD5--
for two to six line ends
1442443
Operator panel options see next
4-line backlit display 2 page
Backlit graphic display, key-operated switch 3
Relay type
Multi-end differential prot. relay for two line end operation1) 2
Multi-end differential prot. relay for multi-line end op. (2 to 6) 3
Measurement input
IPH = 1 A2), IGnd = 1 A (min. = 0.05 A) 1
IPH = 1 A2), IGnd = high sensitive (min. = 0.003 A) 2
IPH = 5 A2), IGnd = 5 A (min. = 0.25 A) 5
Operator panel with: IPH = 5 A2), IGnd = high sensitive (min. = 0.003 A) 6
function keys,
numerical keys,
Rated auxiliary voltage (power supply, binary indication voltage)
PC interface
display (pos. 5) 24 to 48 V DC, binary input threshold 17 V4) 2
key-operated 60 to 125 V DC3), binary input threshold 17 V4) 4
switches (pos. 5) 110 to 250 V DC3), 115 V AC, binary input threshold 73 V4) 5
220 to 250 V DC3), 115 V AC, binary input threshold 154 V4) 6
Unit design / number of inputs and outputs

1/2 x 19, 8 BI, 16 BO, for flush mounting, with screw-type terminals A
7 1/1 x 19, 16 BI, 24 BO, for flush mounting, with screw-type terminals C
1/1 x 19, 24 BI, 32 BO, for flush mounting, with screw-type terminals D
1/2 x 19, 8 BI, 16 BO, for surface mounting, with screw-type terminals E
1/1 x 19, 16 BI, 24 BO, for surface mounting, with screw-type terminals G
1/1 x 19, 24 BI, 32 BO, for surface mounting , with screw-type terminals H
1/2 x 19, 8 BI, 16 BO, for flush mounting, with plug-in terminals J
1/1 x 19, 16 BI, 24 BO, for flush mounting, with plug-in terminals L
1/1 x 19, 24 BI, 32 BO, for flush mounting, with plug-in terminals M
With 5 high-speed trip contacts, approx. 1 ms closing time
1/1 x 19, 16 BI, 24 BO, for flush mounting, with screw-type terminals N
With 5 high-speed trip contacts, approx. 1 ms
1/1 x 19, 24 BI, 32 BO, for flush mounting, with screw-type terminals P
1/1 x 19, 16 BI, 24 BO, for surface mounting, with two-tier terminals Q
1/1 x 19, 24 BI, 32 BO, for surface mounting, with two-tier terminals R
1/1 x 19, 16 BI, 24 BO, for flush mounting, with plug-in terminals S
1/1 x 19, 24 BI, 32 BO, for flush mounting, with plug-in terminals T
Region and operating language

Region DE, language German (selectable) A
Region World, language English (GB) (selectable) B
Region US, language English (US) (selectable) C
Region FR, language French (selectable) D
Region World, language Spanish (selectable) E
Regulation on region-specific presettings and function versions:

Region DE: preset to f = 50 Hz and line length in km, only IEC,
1) Hot standby with two protection
directional ground-(earth) fault protection: no logarithmic inverse characteristic,
data interfaces possible.
no direction decision with zero-sequence power Sr
2) Rated current can be selected by Region US: preset to f = 60 Hz and line length in miles, ANSI inverse characteristic only,
means of jumpers. directional ground-(earth) fault protection: no logarithmic inverse characteristic,
3) Transition between the two auxiliary no direction decision with zero-sequence power Sr, no U0 inverse characteristic
voltage ranges can be selected by Region World: preset to f = 50 Hz and line length in km, directional ground-(earth) fault protection:
means of jumpers. no direction decision with zero-sequence Sr, no U0 inverse characteristic
4) The binary input thresholds can be Region FR: preset to f = 50 Hz and line length in km, directional ground-(earth) fault protection:
selected in two stages by means of no U0 inverse characteristic, no logarithmic inverse characteristic, weak infeed logic
jumpers. selectable between French specification and World specification


code
123
System interface: functionality and hardware see next
No system interface 0 page
IEC 60870-5-103 protocol, electrical RS232 1
IEC 60870-5-103 protocol, electrical RS485 2
IEC 60870-5-103 protocol, 820 nm optical, ST connector 3
PROFIBUS-FMS Slave, electrical RS4851) 4
PROFIBUS-FMS Slave, 820 nm optical, double ring, ST connector1)2) 6
PROFIBUS-DP Slave, RS485 9 L 0 A
PROFIBUS-DP Slave, 820 nm optical, double ring, ST connector2) 9 L 0 B
DNP 3.0, RS485 9 L 0 G
DNP 3.0, 820 nm optical, ST connector2) 9 L 0 H
IEC 61850, 100 Mbit Ethernet, electrical, double, RJ45 connector (EN 100) 9 L 0 R
IEC 61850, 100 Mbit Ethernet, optical, double, ST connector (EN 100)4) 9 L 0 S
DIGSI/modem interface (on rear side of unit) and protection interface 9 M
No DIGSI interface on rear of unit 0

DIGSI 4, electrical RS232 1
DIGSI 4, electrical RS485 2
DIGSI 4, fiber-optical 820 nm, ST connector 3
Protection data interface 1 (R2R interface)

FO5: Optical 820 nm, two ST connectors, FO cable length up to 1.5 km 7
for direct connection or via communication networks A
FO6: Optical 820 nm, two ST connectors, FO cable length up to 3.5 km
for direct connection via multi-mode FO cable B
FO17: Optical 1300 nm, LC-Duplex connectors, FO cable length up to 24 km3)
for direct connection via mono-mode FO cable G
FO18: Optical 1300 nm, LC-Duplex connectors, FO cable length up to 60 km3)5)
for direct connection via mono-mode FO cable H
FO19: Optical 1550 nm, LC-Duplex connectors, FO cable length up to 100 km3)6)
for direct connection via mono-mode FO cable J
1) For SICAM energy automation 3) For surface-mounting housing appli- 5) For distances less than 25 km, two optical
system. cations, please select option A attenuators 7XV5107-0AA00 are required
2) Optical double ring interfaces are not (820 nm, 1.5 km) together with an to avoid optical saturation of the receiver
available with surface-mounting hous- external repeater (for Order No., element.
ings. Please, order the version with see Accessories). 6) For distances less than 50 km, two optical
RS485 interface and a separate electri- 4) If position 9 = "E, G, H, Q, R" (surface- attenuators 7XV5107-0AA00 are required
cal/optional converter. mounting housing), please order relay to avoid optical saturation of the receiver
with electrical Ethernet interface. element.


code
123
Functions 1 see next
Trip mode Auto-reclosure Synchro- page
(ANSI 79) check (ANSI 25)
3-pole 0
3-pole n 1
1/3-pole 2
1/3-pole n 3
3-pole n 4
3-pole n n 5
1/3-pole n 6
1/3-pole n n 7
Functions 1 with protection interface 2 9 N oo

Functions 1
Trip mode Auto-reclosure Synchro-
(ANSI 79) check (ANSI 25)
3-pole 0
3-pole n 1
1/3-pole 2
1/3-pole n 3
3-pole n 4
3-pole n n 5
7 1/3-pole n 6
1/3-pole n n 7
Protection data interface 2 (R2R interface)

Optical 820 nm, two ST connectors, FO cable length up to 1.5 km
for direct connection or via communication networks A
Optical 820 nm, two ST connectors, FO cable length up to 3.5 km
for direct connection via multi-mode FO cable B
Optical 1300 nm, LC-Duplex connectors, FO cable length up to 24 km1)
for direct connection via mono-mode FO cable G
Optical 1300 nm, LC-Duplex connectors, FO cable length up to 60 km1)2)
for direct connection via mono-mode FO cable H
Optical 1550 nm, LC-Duplex connectors, FO cable length up to 100 km1)3)
for direct connection via mono-mode FO cable J
1) For surface-mounting applications,

please select option A (820 nm, 1.5 km)
together with an external repeater
(for Order No., see Accessories).
2) For distances less than 25 km, two
optical attenuators 7XV5107-0AA00
are required to avoid optical saturation
of the receiver element.
3) For distances less than 50 km, two
optical attenuators 7XV5107-0AA00
are required to avoid optical saturation
of the receiver element.

Siemens SIP 2008
Selection and ordering data
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
M 4r Ov
ea e e
M sur 24 m o t ( A rcu
Functions
in ed re e c N S rre
Description
,m v m om I 5 nt
a x alue ot m 0 , tim
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
,m s ei a 50 e
Ex Tr nd n d Br
ter e a exte
n n an ica s ea N , pro
of na de v e sfo tio (A ker 5 1 te
di l G d , 5 cti
Additional functions 2
Additional functions 1
cto rm ns NS fa
ffe P ( A r g er 1 N on
I 5 ilur )
re S s N S r o ex 0B e p
nt yn I u p te F) ro
n
n
n
n
n
n
n
n
n
n
n
n
n
ial ch
Ca pr ro Fa 87T ada nsio Di tec
pa ot . ul ) pt n w re tio
co cit ec
tio at t l o i o it
n h pr c t i o n
m ive n bo cat ot n
pe c th o r ( A ecti a l e
n s ha
n
n
n
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ati rg lin w i N S on a r t
e e e th I , e h-
n
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on c Fa
ur u nd m Di 50N arth faul
re
nt at lt l o s eas
ur sta , e t
1 l cat em qu nc 51N d ne
in or ad e p , 6 tw
7SD5 multi-end differential protection relay
ee w en 7 o
t
n
n
n
n
n
n
n d th i ch rila ro
ar te tec N) rks
Ov m ac ra tio
t
e
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er
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sp c c (A mho h
en
er (A olta
( A /un NS g e t ec e p
(I> ial p ro
NS
I
N S de I 2 p , V ick tect 21, 2
I 8 rfr 7,5 r o t (A /I u io
n
n
n
n
1 ) eq 9) e c t NS , V p m n w 1N)
ue io I /I e it
n
n
n
n
n
Re nc
str yp Pa 21, /, Z thod h
p r ict ra 21 < s
ro
Order No.
o t ed lle N) )
ec e tec l li
t i o art tio ne
n
n
n
n
n
n h- co
( A fa Po
w m
N S ult pe
I8 (A er s ns
7N NS wi ati
) I 6 ng on
8, de
68 tec
T) tio
n
F
H
D
C
G
E
V
S
N
U
T
Q
P
M
R
L
K
7
6
5
4
3
2
1
0
code
Order
7SD5--
7/75
7
Accessories Description Order No.
Opto-electric communication converter CC-XG (connection to communication network)

Converter to interface to X21 or RS422 or G703-64 kbit/s synchronous
communication interfaces
Connection via FO cable for 62.5 / 125 m or 50 / 120 m and 820 nm
wavelength (multi-mode FO cable) with ST connector, max. distance 1.5 km
Electrical connection via X21/RS422 or G703-64 kbit/s interface 7XV5662-0AA00
Opto-electric communication converter CC-2M to G703-E1/-T1 communication networks

with 2,048/1,554 kbit/s
Converter to interface between optical 820 nm interface and G703-E1/-T1 interface
of a communication network
Connection via FO cable for 62.5/125 m or 50/120 m and
820 nm wavelength (multi-mode FO cable) with ST connector, max. distance 1.5 km
Electrical connection via G703-E1/-T1 interface 7XV5662-0AD00
Opto-electric communication converter (connection to pilot wire)

Converter to interface to a pilot wire or twisted telephone pair (typical 15 km length)
Connection via FO cable for 62.5/125 m or 50/120 m and 820 nm
wavelength (multi-mode FO cable) with ST connector;
max. distance 1.5 km, screw-type terminals to pilot wire 7XV5662-0AC00
Additional interface modules

Protection data interface mod. opt. 820 nm, multi-mode FO cable, ST connector, 1.5 km C53207-A351-D651-1
Protection data interface mod. opt. 820 nm, multi-mode FO cable, ST connector, 3.5 km C53207-A351-D652-1
Further modules
Protection data interface mod. opt. 1300 nm, mono-mode FO cable,
7 LC-Duplex connector, 24 km C53207-A351-D655-1
LC-Duplex connector, 60 km C53207-A351-D656-1
LC-Duplex connector, 100 km C53207-A351-D657-1
Optical repeaters
Serial repeater (2-channel), opt. 1300 nm, mono-mode FO cable,
LC-Duplex connector, 24 km 7XV5461-0BG00
LC-Duplex connector, 60 km 7XV5461-0BH00
LC-Duplex connector, 100 km 7XV5461-0BJ00
Time synchronizing unit with GPS output

GPS 1 sec pulse and time telegram IRIG B/DCF 77 7XV5664-0AA00
Isolation transformer (20 kV) for pilot wire communication 7XR9516
Voltage transformer miniature circuit-breaker

Rated current 1.6 A; thermal overload release 1.6 A; overcurrent trip 6 A 3RV1611-1AG14

Accessories Description Order No.
DIGSI 4
Software for configuration and operation of Siemens protection units
running under MS Windows (Windows 2000 or XP Professional)
device templates, Comtrade Viewer, electronic manual included
as well as Getting started manual on paper, connecting cables (copper)
Basis
Full version with license for 10 computers, on CD-ROM
(authorization by serial number) 7XS5400-0AA00
Professional
DIGSI 4 Basis and additionally SIGRA (fault record analysis),
CFC Editor (logic editor), Display Editor (editor for default
and control displays) and DIGSI 4 Remote (remote operation) 7XS5402-0AA00
SIGRA 4
(generally contained in DIGSI Professional, but can be ordered additionally)
Software for graphic visualization, analysis and evaluation of fault records.
Can also be used for fault records of devices of other manufacturers
(Comtrade format). Running under MS Windows (Windows 2000 or XP Professional).
Incl. templates, electronic manual with license for 10 PCs.
Authorization by serial number. On CD-ROM. 7XS5410-0AA00
Connecting cable
Cable between PC/notebook (9-pin connector)
and protection unit (9-pin connector)
(contained in DIGSI 4, but can be ordered additionally) 7XV5100-4
7
Manual for 7SD522/523 V4.6
English C53000-G1176-C169
Description Order No. Size of Supplier Fig.

package
LSP2089-afpen.tif
Connector 2-pin C73334-A1-C35-1 1 Siemens 7/77

3-pin C73334-A1-C36-1 1 Siemens 7/78
Fig. 7/76 Mounting rail for 19" rack Crimp CI2 0.5 to 1 mm 2 0-827039-1 4000 AMP 1)
connector 0-827396-1 1 AMP 1)
2
CI2 1 to 2.5 mm 0-827040-1 4000 AMP 1)
0-827397-1 1 AMP 1)
LSP2090-afpen.eps
LSP2091-afpen.eps
2
Type III+ 0.75 to 1.5 mm 0-163083-7 4000 AMP 1)
1)
0-163084-2 1 AMP
1)
Crimping For Type III+ 0-539635-1 1 AMP
Fig. 7/77 Fig. 7/78 1)
tool and matching female 0-539668-2 AMP
2-pin connector 3-pin connector
For CI2 0-734372-1 1 AMP 1)
1)
and matching female 1-734387-1 AMP
LSP2093-afpen.eps
LSP2092-afpen.eps
19"-mounting rail C73165-A63-D200-1 1 Siemens 7/76
Short-circuit links For current terminals C73334-A1-C33-1 1 Siemens 7/79

For other terminals C73334-A1-C34-1 1 Siemens 7/80
Fig. 7/79 Fig. 7/80
Short-circuit link Short-circuit link Safety cover for terminals large C73334-A1-C31-1 1 Siemens
for current for voltage small C73334-A1-C32-1 1 Siemens
contacts contacts/
indications 1) Your local Siemens representative
contacts can inform you on local suppliers.

Connection diagram
BO8
BO9
BO10
BO11
BO12
BO13
BO14
BO15
Fig. 7/83
Additional setting by jumpers:

Separation of common circuit of
BO8 to BO12 with jumpers X80, X81,
X82. Switching of BO14, BO15 as NO
7 contact or NC contact with jumpers
X41, X42, X43.
Fig. 7/81 Basic version in housing 1/2 x 19 with 8 binary inputs

and 16 binary outputs
1) Configuration of binary outputs

until Hardware-version /EE.
For advanced flexibility see
Fig. 7/83. Fig. 7/82 Serial interfaces

Connection diagram
BO8
BO9
BO10
BO11
BO12
BO13
BO14
BO15
Fig. 7/85

contact or NC contact with jumpers 7
X41, X42, X43.
Fig. 7/84 Medium version in housing 1/1 x 19

*) For unit version 7SD52xx-xN/S/Q
high-speed contacts

Fig. 7/85.

Connection diagram
BO8
BO9
BO10
BO11
BO12
BO13
BO14
BO15
Fig. 7/87

7 contact or NC contact with jumpers
X41, X42, X43.
Fig. 7/86 Maximum version in housing 1/1 x 19

*) For unit version 7SD52xx-xR/P/T
high-speed contacts

Fig. 7/87.

Dimension drawings in mm / inch
Dimension drawings for SIPROTEC 4

1/2 x 19" flush-mounting housings (7XP20)
Side view 1 Side view 2 Panel cutout
Rear view 1 Rear view 2 Rear view 3 Rear view 4

7SA61/63, 7UM621, 7UM623, 7SJ63, 7UM612, 6MD63 7SA522, 7SD52/53 7UT613
7SJ64
Fig. 17/26
1/2 x 19" flush-mounting housing


1/1 x 19" flush-mounting housings (7XP20)
Side view 1 Side view 2
* Terminals M and L additionally for 7UT635 and 7SJ647 only

** Terminals H and G not for 7SJ645 and 7SJ647
Panel cutout Rear view 1

7SA6, 7UM622, 7SJ64, 7UT633, 7UT635
Rear view 2 Rear view 3

7SJ63, 6MD63 7SA522, 7SD52/53
Fig. 17/28
in 1/1 x 19" flush-mounting housing


1/2 and 1/1 x 19" surface-mounting housings
(7XP20)
Front view Side view

1/2 x 19" surface-mounting,
terminals at top and bottom 7
housing 7XP20
Front view
1/1 x 19" surface-mounting housing 7XP20
(without sloped FO case)
Fig. 17/29
1/2 and 1/1 x 19" surface-mounting housing

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7 Line Differential Protection / 7SD52/53

6 measuring systems (21/21N)

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50 50N Three-stage overcurrent

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Fig. 7/43 Application for three line ends (Ring topology)

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Connection techniques and housing with

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Phase-selective intertrip and remote

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Distance protection (ANSI 21, 21N)

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Elimination of interference signals

Power swing detection (ANSI 68, 68T)

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power. Each overcurrent stage can be set in

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Tripping by the overvoltage measuring Auto-reclosure (ANSI 79)

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Monitoring and supervision functions Local measured values

All binary outputs can be stored like LEDs

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Measured values at remote line ends

WEB Monitor Internet technology

dard software tools and at the same time

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Switching authority Indication derivation

Command processing Chatter disable

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Commissioning aid via a standard Web

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In addition to the differential protection The link to a multiplexed communication

3) For surface-mounting housing the internal

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Communication possibilities between relays

Fig. 7/64 Fig. 7/65

Fig. 7/66 Fig. 7/67

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Typical connection for current

Alternative current measurement

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Alternative current connection

Fig. 7/71 Alternative connection of current transformers for measuring

Alternative current connection

Fig. 7/72 Alternative connection of current transformers for measuring

Fig. 7/73 Connection of current transformer with

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Alternative voltage connection

Fig. 7/74 Alternative connection of voltage transformers for measuring the

Alternative voltage connection

Fig. 7/75 Alternative connection of voltage transformers for measuring the

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General unit data LEDs

1) Ranges are settable by means of jumpers.

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