SEL-734 Advanced Metering System – APP 734

Session 1a: Introduction

SEL-487E Transformer
Current Differential Relay

Session 1a: Introduction

SEL Confidential

Same Platform as SEL-421, SEL-451,

and SEL-487B

z 6U size (one
interface board)
z 7U size (two
interface boards)

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Front-Panel Interface (2)

z Bay controller for

5 breakers and
8 disconnects
(isolators)
z 6 navigational
pushbuttons

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 SEL-734 Advanced Metering System – APP 734
Session 1a: Introduction

Front-Panel Interface

z 24 tri-color,
programmable
LEDs
z 12 dual-function
pushbuttons

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z Four EIA-232 ports

(1 front, 3 rear)
z Optional Ethernet
communications
card

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Communications Card Options

Two 10/100BASE-T

Two 10BASE-FL
Two 100BASE-FX
100BASE-FX,10BASE-FL

10BASE-FL, 10/100 BASE-T

100BASE-FX, 10/100BASE-T

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 SEL-734 Advanced Metering System – APP 734
Session 1a: Introduction

Ethernet Protocols

z FTP
z Telnet
z DNP3 LAN / WAN
z IEC 61850
z IEEE C37.118 Synchrophasors

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EIA-232 Serial Protocols

z SEL Fast Message
z SEL ASCII
z SEL Compressed ASCII
z SEL Fast Operate
z SEL Fast Meter
z SEL Fast SER
z Enhanced SEL MIRRORED BITS®
z DNP3 Level 2 Slave plus dial-out
z Virtual terminal
z Communications with SEL-2600 series RTD
modules SEL Confidential

24 Analog Channels

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 SEL-734 Advanced Metering System – APP 734
Session 1a: Introduction

Supported 1 A / 5 A Current
Combinations

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Main Board I/O

z 7 level-sensitive optoisolated inputs:

ƒ 48, 110, 125, 220, or 250 Vdc
ƒ 5 independent, 2 with a common leg

z 2 standard Form A outputs

z 3 standard Form C outputs

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Interface Board INT2

z 8 optoisolated inputs:
ƒ Independent, level-sensitive

z 13 standard Form A outputs

z 2 standard Form C outputs

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 SEL-734 Advanced Metering System – APP 734
Session 1a: Introduction

Interface Board INT4

z 18 optoisolated, level-sensitive inputs:

ƒ 2 sets of 9 contacts
z 6 optoisolated, level-sensitive,
independent inputs
z 6 high-speed, high-current Form A
outputs
z 2 standard Form A outputs

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Interface Board INT7

z 6 optoisolated, level-sensitive,
independent inputs
z 13 high-speed, high-current Form A
outputs
z 2 standard Form C outputs

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Interface Board INT8

z 8 optoisolated, level-sensitive,
independent inputs
z 14 optoisolated, level-sensitive, common
inputs
z 8 high-speed, high-current Form A
outputs

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 SEL-734 Advanced Metering System – APP 734
Session 1a: Introduction

Easy Access To Jumpers

z Password Jumper (PASSWORD)

z Circuit breaker control jumper
(BREAKER)
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Transformer Protection Functions

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Complete And Comprehensive

Transformer Protection

z Internal faults
ƒ Short circuits

z External
faults / conditions
ƒ Over- / undervoltage
ƒ Over- / underfrequency
ƒ Overcurrent
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 SEL-734 Advanced Metering System – APP 734
Session 1a: Introduction

Internal Faults

z Phase differential protection

ƒ Phase and ground faults

z Negative-sequence differential protection

ƒ More sensitive for turn-to-turn faults
(detects less than 2% of winding)

z Restricted earth fault protection

ƒ More sensitive for ground faults close to the
neutral for grounded wye windings
(single turn from neutral point) SEL Confidential

External Faults

z Overcurrent
z Directional elements
z Over- / undervoltage
z Over / underfrequency
Over-
z Volts / hertz
z Breaker failure
z Over- / underpower
z Current unbalance
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Differential Protection

z Accepts up to five windings for differential

protection
z Each winding input separately enabled
via a SELOGIC control equation
ƒ Remove windings from differential
calculations without changing setting groups

z Configure unused windings for feeder or

reactor protection
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Session 1a: Introduction

Phase Differential – Combination Of

Elements

z Restrained differential protection

ƒ Instantaneous differential calculations
ƒ Internal / external fault detection
ƒ Second- and / or fourth-harmonic restraint
and / or blocking
ƒ Fifth-harmonic blocking

z Unrestraint differential protection

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Phase Differential Characteristic

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Load Current — Slope 1

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 SEL-734 Advanced Metering System – APP 734
Session 1a: Introduction

External Fault — Slope 2

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Negative-Sequence Differential
Element

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Heavy Load: Negative-Sequence

Differential Element More Sensitive

Phase Differential Element Negative-Sequence

Differential Element
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 SEL-734 Advanced Metering System – APP 734
Session 1a: Introduction

Restricted Earth Fault (REF)

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REF Characteristic

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Current Compensation in
30-Degree Increments

⎡ IAnC ⎤ ⎡ IAn ⎤
⎢ IBnC ⎥ = [CTC (m)]⋅ ⎢ IBn ⎥
⎢ ⎥ ⎢ ⎥
⎢⎣ ICnC ⎥⎦ ⎢⎣ ICn ⎥⎦

z m = 0, 1, …, 12
ƒ m = 0: 3 x 3 identity matrix (no changes)
ƒ m ≠ 0: remove I0; change angles
ƒ m = 12: remove I0; no angle changes SEL Confidential

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 SEL-734 Advanced Metering System – APP 734
Session 1a: Introduction

Overcurrent Protection (50)

z Three levels of overcurrent elements for

each winding
ƒ Phase (instantaneous, definite-time; T-C)
ƒ Negative-sequence
(instantaneous, definite-time; T-C)
ƒ Residual (instantaneous, definite-time; T-C)

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Overcurrent Protection (51)

z 10 non-assigned elements
ƒ Select analog quantities
ƒ U.S. (U1 to U5)
ƒ IEC (C1 tto C5)

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Overcurrent Protection (51)

*
*

*SELOGIC Variable!
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 SEL-734 Advanced Metering System – APP 734
Session 1a: Introduction

Combined Phase and Residual 51

Protection (S,T and U,W)

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Voltage Polarized Directional

Elements: S, T, U, W, X

z Positive-sequence directional elements

z Negative-sequence directional elements
z Zero-sequence directional elements
z Best Choice Ground Directional Element®

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Negative- And Zero-Sequence

Directional Elements Characteristic

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 SEL-734 Advanced Metering System – APP 734
Session 1a: Introduction

Positive-Sequence Directional
Elements Characteristic

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Change Element Direction With the

CTPn Settings

n = S, T, U, W, X

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Voltage And Frequency Elements

z Ten over- and ten undervoltage

ƒ Select operating quantities from phase,
positive-, negative-, zero-sequence, and
more….

z Six over- / underfrequency

ƒ Uses positive-sequence voltage

z Two volts / hertz elements

ƒ Two levels of definite time V / Hz
ƒ User-defined V / Hz curve
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 SEL-734 Advanced Metering System – APP 734
Session 1a: Introduction

Two Levels Of Definite Time V / Hz

Level 1 Level 2
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User-Defined Curve

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Breaker Failure

z Five breaker failure

elements
ƒ Phase and neutral current

z Open-phase
p p detection
ƒ Less than ¾ cycle OC element
reset

z Alternative logic for

ƒ Initiate or current signal not
continuously present

SEL Confidential

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 SEL-734 Advanced Metering System – APP 734
Session 1a: Introduction

Ten Configurable Under- /

Overpower Elements

Real Power Reactive Power

Characteristic Characteristic
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Monitoring

z Breaker monitoring
z Battery monitoring
z Th
Thermal
l monitoring
it i
z Through-fault
monitoring

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Circuit Breaker Monitoring

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 SEL-734 Advanced Metering System – APP 734
Session 1a: Introduction

DC Battery Monitor

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Transformer Thermal Monitoring

z IEEE C57.91-1995
z Model calculates the rate
at which the transformer
insulation presently ages,
p
compared with the aging
g g
rate at a reference hot
spot
z Also calculates hot-spot
temp, top oil, daily and
total loss-of-life

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Thermal Model I/O

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 SEL-734 Advanced Metering System – APP 734
Session 1a: Introduction

Transformer Through-Fault Model

z IEEE C57.109-1993
z Model calculates the cumulative I2t
(mechanical / electrical) effects of through
faults on the transformer insulation

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Transformer Through-Fault Curves

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Metering

z Fundamental quantities (MET F)

z RMS current and voltage (MET RMS)
z Secondaryy quantities
q ((MET SEC))
z Differential quantities (MET DIF)
z Synchrophasor (MET PM)
z SEL-2600 temperature (MET RTD)

SEL Confidential

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 SEL-734 Advanced Metering System – APP 734
Session 1a: Introduction

Metering

z Energy (MET E)
z Demand meter (MET D)
z Protection math variables ((MET PMV))
z Automation math variables (MET AMV)
z Battery (MET B)
z Analog quantities (MIRRORED BITS)
(MET ANA)
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Oscillography For 24 Channels

z High-resolution oscillography
ƒ 1, 2, 4, or 8 kHz sampling
ƒ COMTRADE output files

z Event reports
ƒ 4 or 8 samples per cycle

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Event Reporting

z Full event reports

ƒ Winding currents (EVENT)
ƒ Digital quantities (EVENT D)
ƒ Diff
Differential
ti l quantities
titi (EVENT DIF)
ƒ Compressed event reports
ƒ 20 programmable analog quantities

SEL Confidential

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Session 1a: Introduction

Sequential Events Recorder

z Accepts up to 250 digital points (or aliases)

z Includes chatter criteria
z Stores latest 1000 operations in non-volatile
memory
z Latest 200 SER events available on front panel.
z Various ways to sort / display by ser command

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Synchrophasors For 24 Channels:

6 Voltages and 18 Currents

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Programming – 250 Protection Lines

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 SEL-734 Advanced Metering System – APP 734
Session 1a: Introduction

Commissioning Assistant

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Commissioning Report

Commissioning
Assistant
calculates the
correct matrix
pair for each
terminal

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Questions?

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01a_INT487E_Introduction_r2.ppt 20