20 protection and substation control ev-s_v13_17.07.00- 1 universal differential relay 7sd610 87...

Protection and Substation Control EV-S_V13_17.07.00- 1

Universal Differential relay 7SD610

87 Universal differential relay

- For line / cables- with transformers in the protection zone

With secure digital communication

- Fibre optic cables- Communication networks- Digital telefon network / telefon cables*

7SD610* In preparation


Protection and communication come togetherThree benefits of the 7SD610

Differential protection for the universal use with easy to handle settings Two line terminals, Less CT-requirements Handles transformers and compensation coils within the protection zone Tripping time less than one period

Additional functions Backup (parallel running) or emergency O/C - function (3 stages) Breaker failure protection, Overload protection, Switch on to fault feature, 4 fast remote signals, Intertrip function Supervision of the communication link, Bus-wire supervision

Direct and modular connection to fibre optic and digital communication

networks


Application - Fibre optic connection

FO

820 nm, 1,5 km 820 nm, 3 km

Multimode62,5/125 um

1300 nm, 10 km1300 nm, 35 km

Monomode9/125 um

Direct connection with fibre optic (FO) cables- Offers high speed tripping (16 ms)- Flexible plug in modules for different fibre typ or distance

Distance FO-cable Connector

STST

STFC


Application - Digital communication network

E

O

O

E

Communication-

system

Communicationconverter

820 nm, 1,5 km

Synchonous electrical interface X.21 (64/128/512 kBit/s) or G703.1 (64 kBit/s)

Connection via a communication system with multiplexers- Automatic delay time measurement (adaptive correction from 0 ms - 30 ms)- Immediate detection of switch-over conditions of communication routes- Communication addresses,


Application - Leased telefon line

Leased telefon line (standby or dial-up)- 2 wire telefon cable (max. 8 km)*

E

O

O

E

820 nm, 1,5 km

* In test

Communicationconverter

Twisted telefon pair

max. 8 km (5 miles)

5 kV insulationintegrated


Applications - Line or cable with different CT - ratios

400:5, 10P10, 10VA, kAlf = 59, k = 50

VT optionNot requiredfor diff. function

- Mismatch of the CT ratio of 1:8 allowed, 1A or 5A input settable in the relay- CT datas / errors are set in the relay and automatically considered in the restraint current calculation- CT-requirement: kAlf for the local CT must be greater then k (kmin = 30)

600:1, 5P20, 20 VA, kAlf = 130, k = 33,3

___ IN,CT

IK,max

k=

20 kA

87L50/5150 BF49


Application - Transformer and line in the protection zone

20 MVA, 110 kV/20 kV, Yd1 10P10, 10 VA, 200:1 10P10, 10 VA, 500:5

- Settings for the transformer datas in each relay with vector group matching, ratio adaption and zero sequence elimination- Differential setpoint is rated to the nominal current of the transformer- Inrush restraint with second harmonic included (time limit for Crossblock) High set element for immetiate trip (16 ms) through heavy fault currents

tripcommand

1 mile

87T50/5150 BF49


Scope of functions / Hardware options

Scope of functions

- Fast high set element IDiff>>. Current summation.- Sensitive trip stage with vector summation IDiff>

- Autoreclosure 1/3 pole- Communication features- Commissioning aid- Overload protection- Backup-/emergency overcurrent- Breaker failure protection- Switch on to fault protection- 4 remote commands- Intertrip (also from external)- User defined logic- Exact time tagging

Relay Hardware

O

O 1300 nm

10 kmmonomode

O 1300 nm35 kmmonomode

OE

ElectricalX21G703.1interface

Options for the Protection Interface

1/3 *19´´

internal

internal

internal

External converter

820 nm1,5 / 3 kmmultimode

820 nm1,5 kmST-connectors

- 3Iph, and IE - 4 U - 7 binary inputs- 5 trip contacts - 1 alarm contact- 1 Protection interface - System interface (option)- Rear DIGSI interface (option)- Time synchronisation interface for GPS

ST-connector

ST-connector

FC-connector


Modular hardware concept with Plug in modules

Protection interface 1Port D

Synchronous N x 64kB/sec

Serial time sync. input GPS-receiver

Interfacemodul 1RS485RS232

Service-interface DIGSI 4; also for modem connection

and Browserlocal-PCinterface

DIGSIlocal

Browser

Substation controlCommunication modules

RS485 or RS232

Available ProtocolsIEC - standard

Interfacemodul 2RS485 or FO

Subst. control interface

Plug in modules

Remote line end


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 differential protection (2 terminals). Tripping time of 16 ms with fast trip stage.

Fundamental vector comparison for the sensitive trip stage. Detects even high resistive faults under full load.

Dynamic increase of sensitive differential setpoint during switch-on of long cables (settable time)

CT saturation detector. Increase of restraint current if CT-saturation is indicated by the measured fault currents.

Phase selective intertrip within 20 ms (normally not required)

Settable delay time for single phase faults (special feature for inductive compensated networks)

Inrush detection with 2nd harmonic. Undelayed trip forheavy fault currents.

Vector group matching and zero sequence current elimination included with transformer option

Lockout function


Adaptive differential relayingConsideration of CT- errors and comms-errors

IDiff

I1 I2

IDiff = I1 + I2 + I3

Currentsummation:Max. errorsummation:

IDiff>

I1

I2

Trip, if diff.current exceeds the estimated error (=restraint)

Restraint area

Tripping area

IRest

IRest = IDiff> + eCT1 * I1 + eCT2 * I2 + Sync.error

Max.measurementerror (e) due tolinearCT - error


Settings for CT - parametrer

c.t. e.g. 5P20, 10VA

% tolerance at ALFN

Thumb rule:

Ri 0,1...0,2 * RN

RN at 10 VA 10

=> Ri 2

ALFe = ALFN Pi + PN

Pi + PB

With PB = Pleads + Prelay (0,1 VA)

= 2 VA + 10 VA

2 VA + 1 VA= 4

Resulting Relay Parameter:

• effective ALF / nominal ALF = 4 (calculation as per above)• IEC 44 -1: tolerance in load area up to ALFe / ALFN : 1% with 5P, 3% with 10P c.t.s total error at accuracy limit nN = 5% with class, 5P and 10% 10 P

ALFe

ALFN

C.t. ParameterC.t. Parameter


Approximation of CT-tolerance

Basis for the restraint current calculation is the estimated max. measurement error of the CT

ALFe / ALFN • IN,c.t

: parameter 7SD610, 7SD52

IDiff

I1

I1

Example: 10P10, eload < 3%, eFault at k_ALFN = 10%

Fault current tolerance

Load current toleranceTolerance ofa real CT


Restaint current calculted by the relay from the CT-datas

I1 I2

eLoad = 5% (3% + 2% safety magin)eFault = 10%kAlf / kAlf,N =2

e

I/IN,CT1

5%10%

eLoad = 5%eFault = 10%kAlf / kAlf,N =1

e

I/IN,CT1

5%10%

2

Both CT´s: 400:1, 10P10

IC=50 A

Setting for I_Diff>: IDiff> = 2,5*IC / IN,CT = 125 A Restraint current calcuation by the relay (adaptive):I1 = I2 = 200 A: IRest = IDiff> + 0,05*206 A + 0,05*200A = 125 A + 20 A = 145 A (=0,36)I1 = I2 = 600 A: IRest = IDiff> + 0,1*600A + 0,05*600A = 125 A + 90 A = 215 A (=0,53)I1 = I2 = 1000 A: IRest = IDiff> + 0,1*1000A + 0,1*1000A = 125 A + 200 A = 325 A (=0,82)


Values displayed in DIGSI 4 with 50% load


Grafical view in a Browser screen with 50% load

Currents (amount / phasor) Differential and restraint values


To complete the 7SD610Additional 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)

Breaker failure protection

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

4 remote commands via binary input or logic inputs

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 phaseFault records are exactly time synchronized at both line ends

Fast monitoring functionsFast broken wire supervision, Current symmetry

Switch On to Fault protection with breaker monitor

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


Synchronous data transmission by HDLC- protocol - 32 bit CRC-checksum offers extreme high security

Permanent supervision of the data transmission

Microsecond resolution time tagging of the telegrams - Exact time synchonisation between both line terminals

Two settable alarm levels - Data disturbance (detects gaps in a telegram stream) - Complete data failure (interruption of the data transmission)

Measurement and compensation of transmission duration - max. 30 ms (adaptivily)

Measurement of the availability of the comms link in per/min, per/h 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

Familiar with digital communication networks Features of the relay to relay communication


IL1_1

IL3_1

IL2_1

IL1_2

IL2_2

IL3_2

Phi1->2

Transmission time duration measuement (delay time)Mean value of transmit and receive direction

Test loop facility included- Helps to test the fibre or comms-link

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

Test mode which can be activated via DIGSI, bin.input- Remote diff. is blocked from the local side

Commissiong mode (diff. runs but doesn´t trip)

Complete commissioning support with DIGSI 4 andbrowser based PC-software

Plug and Protect Commissiong helps and test features


Browser view - Startpage with overview

Web-Server is running in the device. Homepage of the device settable with DIGSI (e.c. http://140.141.255.150)Serial access to the device via a standard Dial up Network under WINDOWS(R)


Browser view - Local and remote measurements


Browser view: Diff. and restraint measurements


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 Exact time synchronized fault records from both line ends


Prefault and fault conditions in the vector diagram

20 protection and substation control ev-s_v13_17.07.00- 1 universal differential relay 7sd610 87...

Documents