presentation 7sd52 en

8/8/2019 Presentation 7sd52 En

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Protection and Substation ControlEV-S_V13_17.07.00- 1

Line differential relay 7SD52

Line differential relay for HV andUHV lines/cables with a serialcommunication interface

7SD52


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Protection and communication join togetherThree benefits of the 7SD52

Differential protection for theuniversal use with easy to handle

settings

Two up to six line ends , for serial and parallelcompensated lines, handles transformers and

compensation coils within the protection zone,

tripping time approx. 15 ms with fast high set element

Additional functions for very

long overhead lines and cables

Considation of local CT errors, chargecurrent compensation (step 2), increased setpoint

during switching-on conditions

Direct and modular connection to fibre

optic and digital communication

networks


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Application for a three terminal configuration

SDHcomms-network

X21G703.1820 nm

max.3 km

eo

PCMmulti-plexer

Monomode fibre optic cable up to 35 km with 1300 nm interface

Distance relay7SA52

Monomodefibre

opticcableupto10k

m

(1300n

m

modul)

PCMmulti-plexero

e

oe

Comms-converterG703.1: 64 kBitX21: N*64 kBit (1N8)

Option:

I-REGB

timesynchronisation


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Scope of functions / Hardware options

Scope of functions

- Fast high set elementwith charge comparision

- Sensitive normal tripstage with vectorsummation principle

- Autoreclosure 1/3 pole- Communication features- Commissioning aid- Overload protection- Backup-/emergencyovercurrent

- Multiterminal extention- Switch on to faultprotection

- 4 remote commands24 remote signals

Relay Hardware

O

O1300 nm

10 kmmonomode

O 1300 nm35 kmmonomode

OE

ElectricalX21G703.1interface

Options for the Protection Interface

*19

internal

internal

internal

1*19External converter

16 binary inputs24 contacts

24 binary inputs32 contacts

Option: 5 fasttrip contacts

820 nm1,5 / 3 kmmultimode

820 nm1,5 kmST-connectors

3Iph , and IE

4 U8 binary inputs16 contacts1 - 2 protection interfacesSystem interface

PC-interfaceTime synchronisation

ST-connector

ST-

connector

FC-connector


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Hardware option of the comms interfaces

Protection interface 2Port E

Synchronous N x 64kB/sec

7SD5

2

Protection interface 1Port D

Synchronous N x 64kB/sec

Serial timesync. input GPS-receiver

Interfacemodul 1

RS485 or FOor RS232

service-interface DIGSI 4; also for

modem connectionand Browser

local-PCinterface

DIGSIlocal

Browser

Substation controlcommunication modules

FO (Fibre optic) or RS485or RS232Available ProtocolsIEC - standard

Interfacemodul 2RS485 or FO

Subst. control interface

Plug inmodules

Remote line end 2

Remote line end 1


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Main processorboard of the relay

Sockets for thecommunicationmodules

Main board of the relay with itsCommunication - Interfaces


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Main protection functionFeatures of the differential function

Phase selective multiend differential protection(2 - 6 ends). Tripping time 15 ms with fast chargecomparison protection.

Fundamental vector comparison for the sensitive

trip stage.

Dynamic increase of differential setpoint during

switch-on of long lines / cables (settable time) CT saturation detector(only 5 ms saturation free

time due to external faults necessary)

Phase selective intertrip within 15 ms

Settable delay time for single phasefaults (feature for inductive compensatednetworks)

Option: Inrush 2nd harmonic restraint withvector group adaption. Undelayed trip for highfault currents

Optional Lockout function


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Adaptive differential relayingConsideration of CT- errors and comms-errors

IDiffIN

I

IN

I1 I2

I3

IDiff = I1 + I2 + I3Phasor summation:Error summation:

IDiff>

I1

I2 I3

I1

I = IDiff> + Linear CT-error ( + Syncronization errorIK)

Trip, if diff.current exceeds the max. permissible error

Restraintarea

Trippingarea


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To complete the 7SD52Additional functions

3 stage backup- or emergency O/C protection(Can be activated automatically if the communication withthe remote end is >50 ms interrupted)

Overload function (Thermal replica with IOperation )

User definable logic and control functions(AND, OR, NOT, Timer, Flip-Flop)

4 remote commands via binary input or logic inputs(destination is adressable), 24 remote signals

Operational values: currents, voltages, power,delay time, differential current - remote end refresh 2s

Fault recorder with voltages, currents, binary tracesand differential and restraint current per phase

Fast monitoring functions(Fast broken wire supervision, Current symmetry)

Switch On to Fault protection

Option: Three pole and single pole AR (Single pole ARduring 2pole fault without earth possible, adaptive AR)


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Synchronous data transmission by HDLC- protocol

Permanent supervision of the data transmission

Measurement and compensation of signal transmission time (max. 20 ms)

Counts number of invalid telegrams Blocking the diff.protection if transmission failure rate is too high

Settings for the data transmission(N*64 kBit/s, N settable from 1 - 8, synchronous HDLC-protocol)

Communication device addresses (Protection devices are clearly assigned to a defined protection

section)

Detection of reflected data in the loops in comms- network

Step 2: Microsecond exact time synchronisation

via satellite (civil - IRIG-B) (If signal transmission time depends on the transmission direction,

Online high resolution fault recorder)

Familiar with digital communication networks

Features of the relay to relay communication


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Ring and Chain topologie

Closed ring Partial current summation

I3

I2

I1

side 1

side 2

side 3

I3

I2

I1

side 1

side 2

side 3

I3+I1 I2

I1+I2 I3

I3+I1

I1+I2

Connection to

other diff. relays

Automatic change fromclosed ring to chain, ifone connection is lostor not available


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Topologies: Chain topology for max. 6 line ends

1 32

46 5

PI - Protection Interface

PI1 PI1 PI2 PI1

PI2

PI1

PI2PI1PI2PI1


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Topologies: Ring topology, 6 line ends

31 2

46 5

PI1

PI2

PI1

PI2PI1PI2PI1

PI2

PI1

PI2 PI1 PI2

PI - Protection Interface


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IL1_1

IL3_1

IL2_1

IL1_2

IL2_2

IL3_2

Phi1->2

Signal transmission timeMean value of transmit and receive direction

Generation of signals for switching test loopsSending of defined telegram patterns looped back to thereceive input of the transmitting relay

Absolute value and phase measurement of currentsLocal measurement of angle between IL1 , IL2 , IL3

,Angle between currents of each phase from remote CB test trip

Counting of faulty telegrams in % per minute and hour

Activation of binary inputs and outputs by operatingsoftware DIGSI 4.

Display of the status of binary inputs

Test telegrams to the substation control system Automatic Switchover from 3 line to 2 line end

configuration (while commissioning 3rd line end)

Complete commissioning support with DIGSI 4 andbrowser based PC-software

Plug and ProtectCommissiong helps and test features


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Browser based commissioning aid


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Comprehensive fault analysis with DIGRA 4

iEe iL1 iL2 iL3

t/s-0,075 -0,050 -0,025 0,000 0,025 0,050 0,075 0,100 0,125

I/A

-2,00

-1,50

-1,00

-0,50

-0,00

0,50

1,00

1,50

uL1 uL2 uL3

t/s-0,075 -0,050 -0,025 0,000 0,025 0,050 0,075 0,100 0,125

U/V

-80

-60

-40

-20

0

20

40

60

80


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Prefault and fault conditions in the vector diagram

presentation 7sd52 en

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