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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 Substation Control EV-S_V13_17.07.00- 2
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
Protection and Substation Control EV-S_V13_17.07.00- 3
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
Protection and Substation Control EV-S_V13_17.07.00- 4
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,
Protection and Substation Control EV-S_V13_17.07.00- 5
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
Protection and Substation Control EV-S_V13_17.07.00- 6
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
Protection and Substation Control EV-S_V13_17.07.00- 7
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
Protection and Substation Control EV-S_V13_17.07.00- 8
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
Protection and Substation Control EV-S_V13_17.07.00- 9
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
Protection and Substation Control EV-S_V13_17.07.00- 10
Main processor board of the relay
Sockets for the communicationmodules
Main board of the relay with it´s Communication - Interfaces
Protection and Substation Control EV-S_V13_17.07.00- 11
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
Protection and Substation Control EV-S_V13_17.07.00- 12
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
Protection and Substation Control EV-S_V13_17.07.00- 13
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
Protection and Substation Control EV-S_V13_17.07.00- 14
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
Protection and Substation Control EV-S_V13_17.07.00- 15
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)
Protection and Substation Control EV-S_V13_17.07.00- 16
Values displayed in DIGSI 4 with 50% load
Protection and Substation Control EV-S_V13_17.07.00- 17
Grafical view in a Browser screen with 50% load
Currents (amount / phasor) Differential and restraint values
Protection and Substation Control EV-S_V13_17.07.00- 18
Values displayed in DIGSI 4 with 150% load
Protection and Substation Control EV-S_V13_17.07.00- 19
Grafical view in a Browser screen with 150% load
Currents (amount / phasor) Differential and restraint values
Protection and Substation Control EV-S_V13_17.07.00- 20
Values displayed in DIGSI 4 with 250% load
Protection and Substation Control EV-S_V13_17.07.00- 21
Grafical view in a Browser screen with 250% load
Currents (amount / phasor) Differential and restraint values
Protection and Substation Control EV-S_V13_17.07.00- 22
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)
Protection and Substation Control EV-S_V13_17.07.00- 23
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
Protection and Substation Control EV-S_V13_17.07.00- 24
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
Protection and Substation Control EV-S_V13_17.07.00- 25
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)
Protection and Substation Control EV-S_V13_17.07.00- 26
Browser view - Local and remote measurements
Protection and Substation Control EV-S_V13_17.07.00- 27
Browser view: Diff. and restraint measurements
Protection and Substation Control EV-S_V13_17.07.00- 28
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
Protection and Substation Control EV-S_V13_17.07.00- 29
Prefault and fault conditions in the vector diagram