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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