20 protection and substation control ev-s_v13_17.07.00- 1 line differential relay 7sd52 line...

Protection and Substation Control EV-S_V13_17.07.00- 1

Line differential relay 7SD52

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

7SD52


Protection and communication join togetherThree benefits of the 7SD52

Differential protection for the universal use with easy to handle settings Two up to six line ends , for serial and parallel compensated 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, charge current compensation (step 2), increased setpoint during switching-on conditions

Direct and modular connection to fibre optic and digital communication

networks


Application for a three terminal configuration

SDHcomms-network

X21G703.1

820 nm

max.3 km

eoPCM

multi-plexer

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

Distance relay7SA52

Mon

omod

e fib

re o

ptic

cab

le u

p to

10

km

(13

00 n

m m

odul

)

PCMmulti-plexero

eoe

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

Option:

I-REGB

timesynchronisation


Scope of functions / Hardware options

Scope of functions

- Fast high set element with charge comparision- Sensitive normal trip stage with vector summation principle- Autoreclosure 1/3 pole- Communication features- Commissioning aid- Overload protection- Backup-/emergency overcurrent- Multiterminal extention- Switch on to fault protection- 4 remote commands 24 remote signals

Relay Hardware

O

O 1300 nm

10 kmmonomode

O 1300 nm35 kmmonomode

OE

ElectricalX21G703.1interface

Options for the Protection Interface

½*19´´

internal

internal

internal

1*19´´External converter

16 binary inputs24 contacts

24 binary inputs32 contacts

Option: 5 fast trip contacts

820 nm1,5 / 3 kmmultimode

820 nm1,5 kmST-connectors

3Iph, and IE 4 U 8 binary inputs16 contacts 1 - 2 protection interfaces System interfacePC-interfaceTime synchronisation

ST-connector

ST-connector

FC-connector


Hardware option of the comms interfaces

Protection interface 2Port E

Synchronous N x 64kB/sec7SD52

Protection interface 1Port D

Synchronous N x 64kB/sec

Serial time sync. input GPS-receiver

Interfacemodul 1RS485 or FOor RS232

service-interface DIGSI 4; also for modem connection

and Browser

local-PCinterface

DIGSIlocal

Browser

Substation controlcommunication modules

FO (Fibre optic) or RS485or RS232Available ProtocolsIEC - standard

Interfacemodul 2RS485 or FO

Subst. control interface

Plug in modules

Remote line end 2

Remote line end 1


Main processor board of the relay

Sockets for the communicationmodules

Main board of the relay with it´s Communication - Interfaces


Main protection functionFeatures of the differential function

Phase selective multiend differential protection(2 - 6 ends). Tripping time 15 ms with fast charge comparison 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 compensated networks)

Option: Inrush 2nd harmonic restraint with vector group adaption. Undelayed trip for high fault currents

Optional Lockout function


Adaptive differential relayingConsideration of CT- errors and comms-errors

IDiff

IN

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

Restraint area

Tripping area


To complete the 7SD52Additional functions

3 stage backup- or emergency O/C protection(Can be activated automatically if the communication with the 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 2 s

Fault recorder with voltages, currents, binary traces and 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 AR during 2pole fault without earth possible, adaptive AR)


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


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, if one connection is lostor not available


Topologies: Chain topology for max. 6 line ends

1 32

46 5

PI - Protection Interface

PI1 PI1 PI2 PI1

PI2

PI1

PI2PI1PI2PI1


Topologies: Ring topology, 6 line ends

31 2

46 5

PI1

PI2

PI1

PI2PI1PI2PI1

PI2

PI1

PI2 PI1 PI2

PI - Protection Interface


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 the receive 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 operating software 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 Protect Commissiong helps and test features


Browser based commissioning aid


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 0,125I/A-2,00-1,50-1,00-0,50-0,000,501,001,50

uL1 uL2 uL3 t/s-0,075 -0,050 -0,025 0,000 0,025 0,050 0,075 0,100 0,125U/V-80-60-40-20020406080


Prefault and fault conditions in the vector diagram

20 protection and substation control ev-s_v13_17.07.00- 1 line differential relay 7sd52 line...

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