Rollarc R400
Rollarc R400
Rollarc R400
Contents
Presentation
Field of application and utilisation range
The Rollarc range
Description of the basic version
Description of the operation
Characteristics
Electrical characteristics
Maximum switching capacities
Contactor operating conditions
Operating mechanism and equipment
Principle electrical diagrams
Basic versions
Fixed versions
Withdrawable versions
2
2
3
4
5
6
6
7
8
9
10
10-11
12-13
14-15
Dimensions
Cubicle installation
16
17
Rollarc technique
Advantages of Rollarc
SF6 gas properties - Rotating arc technique
Soft breaking
18
18
19
20
Fuse-contactor assembly
Utilisation guide
21
21
Order form
23
Services
24
Field of application
and utilisation range
PE56761
Presentation
Description
The Rollarc three-pole indoor contactor uses sulphur hexafluoride (SF6) gas for
insulation and circuit-breaking.
Circuit-breaking is based on the rotating arc principle. The basic version is made up
of three pole units installed in the same insulating enclosure. The part of the
enclosure containing the active parts of the poles is filled with SF6 gas at a gauge
pressure of 2.5 bars.
There are two types of Rollarc contactors:
b The R400, with magnetic holding
b The R400D, with mechanical latching.
Main advantages
1: MV connections
2: LV connections
3: auxiliary contacts
4: pressure switch
5: electromagnetic
operating mechanism
b
b
b
b
b
b
Field of application
DE58130EN
Utilisation range
10
Standards
Rollarc complies with the following standards and specifications:
b IEC publication 60470
b IEC 62271-105.
Installation references
5
U
(kV)
0
7.2
10
12
b
b
b
b
Solmer, Michelin, Shell, Esso, CFR, Pechiney, Naphtachimie, Usinor, Sacilor, Sollac
Nuclear and conventional thermal power stations
Mines de Saar (Germany)
Nokia (Finland), Kafak (Sweden).
Presentation
PE60247
Basic version
PE56762
Fixed version
PE56763
The Rollarc R400 and R400D contactors are available in three versions:
Withdrawable version
Fixed and withdrawable versions may be equipped with fuses when the short-circuit
current is greater than the contactor rating.
The fuses used are of the indoor Fusarc CF type with strikers that actuate the contactor
opening mechanism.
PE30250
Enclosure
PE30251
PE56764
Presentation
Electromagnetic coils
Rollarc is actuated by electromagnetic coils that ensure closing and hold the device
in the closed position.
PE30253
Auxiliary contacts
PE30254
coil
Mechanical latching
The R400D is actuated by electromagnetic coils that ensure closing of the device
and has a mechanical latching device which holds the contactor in the closed
position without a continuous power supply.
A release is used to free the latching mechanism.
Mechanical latching device
DE58150
Presentation
2
3
5
7
6
9
4
8
10
11
1
1 - MV terminals
2 - Electromagnet
8 - Sealing bellows
3 - Blowout coil
9 - Flexible connector
10 - Enclosure
11 - Molecular sieve
DE58151
Operation
Fig. 1
Fig. 2
Fig. 3
Fig. 4
Rollarc 400 is a magnetic device that uses the rotating arc technique to interrupt
the current.
b at the beginning of an opening cycle, the main contacts and the arcing contacts
are closed (fig.1).
b isolation of the main circuit is achieved by the separation of the main contacts (fig. 2).
The arcing contacts are still closed. The current flows through the coil, the arcing
contacts and the flexible connector.
b the arcing contacts open shortly after the main contacts. The resulting arc
is made to rotate between the two circular runners of the arcing contacts by
the electromagnetic field produced by the coil, the force of which depends on
the current to be interrupted (fig. 3).
By design and due to phase shift between the current and the electromagnetic field,
this force is still significant at zero current.
b at zero current, the gap between the contacts recovers its initial dielectric strength
thanks to the inherent qualities of SF6 gas (fig. 4).
Electrical characteristics
Characteristics
Electrical characteristics
Rated voltage
Rated
current (3)
Making capacity
Short
time
current
Mechanical endurance
Ur
50-60 Hz
1.2/50 s
50-60 Hz
kV
kV peak
kV rms
kA
kA
kA peak
kA
kA rms
3.3 to 4.76
60
20
10
50
400
25
125
10
7.2
60
20
10
50
400
25
125
10
12
60
28
40
400
20
100
Ir
With fuses
(prospective current) 3 s
Opening time at U
Breaking time
Closing time
Without relays: 20 to 40 ms
Without relays: 40 to 60 ms
With relays: 30 to 50 ms
With relays: 50 to 70 ms
Control circuit
DC
AC
Pick-up
1050 W
900 VA
Seal-in
30 W
40 VA
Opening
80 W
100 VA
Power consumption:
Auxiliary switches
Rated current
10 A
Breaking capacity
Electrical endurance
DE58131
This curve indicates the number of operations N according to the breaking current I,
in class AC3 or AC4.
b R400
v 300 000 operating cycles at 250 A
v 50 operating cycles at 10 000 A.
b R400D
v 100 000 operating cycles at 200 A
v 50 operating cycles at 10 000 A.
I (A)
10000
5000
3000
2000
1000
500
300
200
R400
100
50
40
20
R400D
5 10
50 100
N
100000 300000
Characteristics
When the contactor is used in conjunction with fuses, the maximum switching
capacities may be determined using the fuse curves and by taking into account:
b the characteristics of the load (motor starting currents, starting times, transformer
inrush currents)
b the amplitude of the limited interrupted current which is a function of the
prospective fault current and the fuses employed. The limited interrupted current
should not exceed the electrodynamic withstand capacity of the contactor.
For values less than those presented in the table below, see:
b for motor control, page 22
b for transformers, technical sheet AC0479E.
Service
voltage
Without fuses
With fuses
Motors (1)
kV
kW
Max. fuse
rating see
TS AC0479E
Transfo. Capacitor
banks
kVA
kvar
(l = 292 mm)(2)
Motors in k (1)
5 s start ls/In = 6
10 s start ls/In = 6
Starts/h: 6
Starts/h: 12 Starts/h: 6
Starts/h: 12
940
1060
Transformer
(standard max.
rating)
Capacitors
(single bank)
kVA
Kvar
1000
790
3.3
1560
1800
1255
250
1160
1060
3.6
1690
1965
1370
250
1260
1150
1150
1020
1250
865
4.16
1960
2270
1585
200
820
735
735
665
1000
800
6.6
3100
3600
2510
200
1295
1165
1165
1050
1600
1270
7.2
3380
3925
2740
200
1410
1270
1270
1145
1600
1385
10
4690
5455
3810
100
520
445
445
445
1250
960
12
5630
6545
4570
100
625
535
535
535
1600
1155
Characteristics
(without fuses)
DE58132
t
DE58133
8h
b Periodical intermittent operation (or intermittent)
In position 1, the contactor equilibrium temperature is not reached.
DE58134
cycle
b Short-time operation
In position 1, the contactor equilibrium temperature is not reached.
t1: standardized values 10 min - 30 min - 60 min - 90 min
t2: time required for the contactor to cool to the temperature of the cooling medium.
DE58135
t1
t2
Tr
150 min
100 min
Allowable overcurrents
The two sets of curves presented here can be used to determine allowable
overcurrents in the Rollarc contactor.
Ic
60 min
40 min
25 min
15 min
10 min
36
0A
32
0A
28
0A
7 min
0A
20 20A
1
0
5 min
3 min
2 min
1,5 min
1 min
50 s
40 s
30 s
20 s
b Cyclical overcurrent
the fourth parameter (see line 2 between figures 1 and 2) can be determined
when three of the four below are known:
v Ioc overcurrent
v Toc duration of overcurrent
v Ic cooling current
v Tc duration of cooling.
Fig. 2
Ts
30 min
2
480
20 min
2 min
Ioc
A
600
15 min
A
8 00
0A
100
0A
0
2
1
10 min
5 min
3 min
40 s
30 s
20 s
15 s
0A
320
A
0
400
0A
480
10 s
5s
0A
600
3s
A
00
80
2s
Example:
Ioc 1200 A for 10 seconds
Tc 200 A for 2 minutes.
0A
160
0A
0
0
2
0A
240
2 min
Fig. 1
380
360
336
lp
160
200
120
Operating mechanism
and equipment
Characteristics
Auxiliary switches
Rollarc contactors are equipped with ten changeover common point auxiliary
switches. Consult the equipment selection table for information on the number
of available switches.
Pressure switch
The optional pressure switch for alarm indications closes a changeover switch
if the gas pressure drop below 1.5 bars.
Contact breaking capacity:
b AC (p.f. = 0.6) 2.2 A at 127 V
b DC 0.5 A at 120 V - 0.4 A at 220 V.
Selection of
accessories
Code
Closing electromagnet
Fixed
version
AC/DC
Withdrawable Basic
version
version
AC/DC
AC/DC
Fixed
version
AC/DC
Withdrawable
version
AC/DC
YF
YM
Shunt trip
YD
CA
Pressure switch
Anti-pumping relay
KN
Closing relay
KMF
Opening relay
KMO
PC
SE
Interlock
Service position indication
SQ2
v
75 kV kit
Mechanical interlock
v
b
v
v
v
v
b
Standard equipment
Optional accessories
Characteristics
DE58137EN
10
60-72
3.15
100-127
2.5
220-250
1.25
48
10
1.1
0.8
110
10
0.4
0.3
220
10
0.24
0.18
Characteristics
DE58138EN
60-72
3.15
100-127
2.5
220-250
1.25
48
10
1.1
0.8
110
10
0.4
0.3
220
10
0.24
0.18
11
Characteristics
DE58139EN
12
60-72
3.15
100-127
2.5
220-250
1.25
48
10
1.1
0.8
110
10
0.4
0.3
220
10
0.24
0.18
Characteristics
DE58140EN
60-72
3.15
100-127
2.5
220-250
1.25
48
10
1.1
0.8
110
10
0.4
0.3
220
10
0.24
0.18
13
Characteristics
DE58141EN
14
60-72
3.15
100-127
2.5
220-250
1.25
48
10
1.1
0.8
110
10
0.4
0.3
220
10
0.24
0.18
Characteristics
DE58142EN
60-72
3.15
100-127
2.5
220-250
1.25
48
10
1.1
0.8
110
10
0.4
0.3
220
10
0.24
0.18
15
Dimensions
Characteristics
DE58143
Basic version
17
350
268
106
46
160
(1)
107
17
M10
91
153
246
107
382
DE58144
Fixed version
150
150
e = 292
88
25x6
170
500
218
15
a
426
(1)
(1)
22
70
400
631
476
a: LV connector
(1) Mounting dimensions
Approximative weight: 65 kg
DE58145
Withdrawable version
150
150
e = 292
95
25x6
170
500
218
15
a
454
(1)
490
a: LV connector
(1) Mounting dimensions
Approximative weight: 85 kg
16
17
400
(1)
743
25
140
(1)
65
Cubicle installation
Characteristics
17
Rollarc technique
Advantages of Rollarc
The Rollarc rotating arc contactor is a modern device with enhanced cooling of
the arc by forced convection leading to the following advantages:
Long life
This results from:
b high product reliability
b very low wear of the active parts which require no maintenance
b the excellent sealing of the enclosure, eliminating the need for subsequent filling.
Mechanical endurance
The operating energy is reduced because arc rotation is directly created by the
current to be interrupted.
The Rollarc contactor can do 300 000 operations in R400 version and 100 000
operations in R400D version.
Electrical endurance
The long life of the Rollarc is due to the negligible degeneration of the gas and to low
wear of the contacts.
The energy dissipated in the arc is low due to:
b the intrinsic properties of the gas
b the short length of the arc
b the very short arcing time.
Wear of the arcing contacts can be checked without opening the poles. The unit is
capable of breaking all load and short-circuit currents, even in the case of frequent
operation. With very high breaking capacity for a contactor, the Rollarc can be used
in a fuse-contactor assembly capable of protecting any circuit against all types of
faults including overloads.
Operating safety
The Rollarc contactor operates at a low relative pressure of 2.5 bars.
18
DE58148
Rollarc technique
SF6 is non-inflammable, very stable, non-toxic gas, five times heavier than air.
Its dielectric strength is much higher than that of air at atmospheric pressure.
DE60355
The exceptional characteristics of SF6 gas are used to extinguish the electrical arc.
Cooling is enhanced by the relative movement between the arc and the gas.
In the rotating arc technique, the arc is set in motion between two circular arcing
contacts (see figure opposite).
When the arcing contacts separate, the current to be interrupted flows through
a solenoid, thus creating an electromagnetic field B.
When the arcing contacts separate, the arc appears between them. The arc is
made to rotate between the two circular arcing contacts by force F, the combined
result of the electromagnetic field and the current.
Force F is directly proportional to the square of the current to be interrupted.
This breaking technique therefore automatically adapts to the current
to be interrupted:
When the current is high, the speed of rotation is high (speed of sound) and cooling
is intense. Just before reaching zero current, the speed is still sufficient to make the
arc rotate and thus contribute to the recovery of dielectric strength at zero current.
Wear of the arcing contacts is very low.
When the current is low, the speed of rotation is also low.
This leads to very soft breaking of the arc without surges, comparable to the
widely appreciated performances of the air breaking technique.
19
Soft breaking
Rollarc technique
100 A
Busbar capacitance
(Cb)
0.05 mF
100 A
1.8 mF
300 A
0.05 mF
300 A
(1) PU =
Overvoltage Pu (1)
1.8 mF
measured peak voltage
Average
Standard
deviation
Max.
Multiple
restrikes
1.76
0.18
2.35
none
1.88
0.13
2.23
none
1.69
0.10
1.90
none
1.79
0.09
1.91
none
U2
3
U2
= 10.35 kV
3
Busbar
representation
Tested
device
DE58149EN
Source
load inductance
R:
load resistance
20
Cb or
Cb + Cc
Fuse-contactor assembly
Utilisation guide
DE58152EN
Fuse-contactor combinations
Principle
The contactor switches the load on and off during normal operation or an overload.
The fuse ensures correct interruption of short-circuit currents according to the
network short-circuit level. A fuse-blown device causes contactor opening.
Economic advantages
For a short-circuit level of 500 MVA, or of 50 kA at 6 kV, the saving in switchgear
costs is more than 50% compared to a circuit breaker solution.
Technical advantages
Contactor: high switching rates and greater mechanical endurance than a circuit
breaker.
Fuse: current limitation that considerably reduces the thermal and electrodynamic
effects of a fault (fig. 1).
Type of
fuse
50
100
125
160
200
250
315
400
500
630
800
1000
Fusarc CF
16
25
50
50
63
80
80
125
125
125
160
200
250
3.3
16
25
40
50
50
80
80
100
100
125
160
200
250
5.5
10
16
31.5
31.5
40
50
50
63
80
100
125
125
160
200
10
16
25
31.5
40
50
50
63
80
80
125
125
125
160
200
6.6
10
16
25
31.5
40
50
50
63
80
80
100
125
125
160
200
10
6.3
10
16
20
25
31.5
40
50
50
63
80
80
100
100
1250
1600
21
Fuse-contactor assembly
= motor efficiency
Motor protection
Id = start up current
Fuse rating
The three charts given below enable the fuse rating to be determined when we know
the motor power (P in kW) and its rated voltage (Ua in kV).
Chart 1: this gives the rated current In (A) according to P and Ua.
Chart 2: this gives the start-up current Id (A) according to In (A).
Chart 3: this gives the appropriate rating according Id and the start-up
duration time td (s).
Td = start up time
Comments
Chart 1 is plotted for a power factor of 0.92 and an efficiency of 0.94.
For values different to this, use the following equation: In =
P
n 3 Ua . p.f.
100
10
Id (A)
1000
10000
100
100
Td (s)
2x250A
Td (s)
2x200A
250A
200A
10
10
50A
160A
63A
80A
125A
1650 kW
P (kW)
1000
100A
10000
DE58153
100
1000 A
10
10
In (A)
In (A)
x12
11kV
x10
10kV
x8
6.6kV
100
x6
100
6kV
5.5kV
167 A
x4
4.16kV
3.3kV
3kV
1000
100
22
P (kW)
1000
10000
10
100
1000
Id (A)
10000
Order form
R400D
Fixed
12 kV - 60 kVbil - 8 kA - 400 A
Contactor type
Basic
Characteristics
Closing trip release
Relay
Quantity
48 Vdc
110 Vdc
220 Vdc
60 Vdc
125 Vdc
240 Vdc
125-127 Vac
220 Vac
50 Hz
100 Vac
110 Vac
60 Hz
100 Vac
110 Vac
50 Hz
100 Vac
110 Vac
60 Hz
100 Vac
110 Vac
220 Vac
125-127 Vac
220 Vac
220 Vac
60 Vdc
125 Vdc
48 Vdc
110 Vdc
220-240 Vdc
125-127 Vac
220 Vac
50 Hz
100 Vac
110 Vac
60 Hz
100 Vac
110 Vac
220 Vac
Options
For basic type
Mechanical interlocking between 2 contactors
500 mm
650 mm
800 mm
Ronis
Profalux
French
English
23
Services
24