Siemens SIPROTEC 7SJ531 - Page 80

-ETHOD OF OPERATION3*
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 !CTION TIMES AND RECLAIM TIMES
)T IS OFTEN APPROPRIATE TO PREVENT READINESS FOR RECLO
SURE WHEN THE FAULT HAS PERSISTED FOR A SPECIFIED
TIME FOR EXAMPLE WHEN IT CAN BE ASSUMED THAT THE
ARC HAS BURNT ITSELF IN TO SUCH AN EXTENT THAT THERE IS
NO CHANCE OF NATURAL QUENCHING DURING THE DEAD
TIME
4HE !2
FUNCTIONS OF 3* ARE PROVIDED WITH SET
TABLE ACTION TIMES SEPARATE FOR 2!2 AND $!2 WHICH
ARE STARTED BY THE FAULT DETECTION SIGNAL )F AFTER EXPI
RY OF THE ACTION TIME NO TRIPPING SIGNAL HAS BEEN GIV
EN RECLOSURE IS BLOCKED
4HE !2
FUNCTIONS OF 3* ARE PROVIDED WITH THREE
SETTABLE RECLAIM TIMES WHICH DO NOT DISCRIMINATE BE
TWEEN 2!2 AND $!2 'ENERALLY THE RECLAIM TIME IS
THE TIME PERIOD DURING WHICH NO FURTHER RECLOSURE AT
TEMPT IS PERMITTED
4HE RECLAIM TIME 4
2%#,!)- IS STARTED AT EVERY RE
CLOSE COMMAND )F AUTO
RECLOSURE HAS BEEN SUC
CESSFUL
 ALL FUNCTIONS RESET TO THE QUIESCENT CONDITION
AFTER EXPIRY OF 4
2%#,!)- ANY FAULT OCCURRING AFTER
THE EXPIRY OF THE RECLAIM TIME IS CONSIDERED TO BE A
NEW SYSTEM FAULT 7HEN A RENEWED TRIP COMMAND IS
GIVEN WITHIN
THIS RECLAIM TIME THE NEXT AUTO RECLOSE
CYCLE IS STARTED IF MULTI
SHOT !2 IS PERMITTED IF NO
FURTHER !2 CYCLE IS PERMITTED A RENEWED TRIP COM
MAND WITHIN THE RECLAIM TIME IS FINAL !2 HAS BEEN
UNSUCCESSFUL
4HE LOCK
OUT TIME 4 ,/#+ IS THE TIME PERIOD DUR
ING WHICH ANY FURTHER CLOSE COMMAND BY THE AUTO
RECLOSE FUNCTION IS BLOCKED AFTER FINAL DISCONNECTION
)F THIS TIME IS SET TO 0 CLOSING IS LOCKED OUT UNTIL THE
!2 FUNCTION IS RESET BY ENERGIZATION OF THE BINARY IN
PUT
!2 2ESET  !FTER THE RESET SIGNAL ALL FUNCTIONS
RESET TO THE QUIESCENT CONDITION
! SPECIAL RECLAIM TIME 4
",/# -# IS PROVIDED FOR
MANUAL CLOSING EITHER VIA A BINARY INPUT OF THE RELAY
OR BY CONTROL OPERATION $URING THIS TIME AFTER MANUAL
CLOSE RECLOSURE IS BLOCKED ANY TRIP COMMAND WILL
BE A FINAL TRIP
 4HREE POLE RAPID AUTO RECLO
SURE
7HEN THE !2 FUNCTION IS READY FOR OPERATION THE
SHORT
CIRCUIT PROTECTION TRIPS THREE POLE FOR ALL
FAULTS WITHIN THE STAGE VALID FOR 2!2 REFER TO 3ECTION
 4HE !2
FUNCTION IS INITIATED PROVIDED TRIP
PING OCCURS WITHIN THE ACTION TIME REFER TO 3ECTION
 7ITH FAULT CLEARANCE DUE TO A TRIP COMMAND
AFTER MULTI
PHASE FAULTS THE SETTABLE DEAD TIME
2!2 4
0(!SE COMMENCES WITH FAULT CLEARANCE
DUE TO A TRIP COMMAND AFTER A SINGLE
PHASE FAULT
THE SETTABLE DEAD TIME 2!2 4
%!2TH COM
MENCES !FTER THE CORRESPONDING DEAD TIME THE CIR
CUIT BREAKER RECEIVES A CLOSING COMMAND THE DURA
TION OF WHICH IS SETTABLE 3IMULTANEOUSLY THE SET
TABLE RECLAIM TIME 4
2%#,!)- 3ECTION  IS
STARTED
)F THE FAULT IS CLEARED SUCCESSFUL 2!2 THE RECLAIM
TIME 4
2%#,!)- 3ECTION  EXPIRES AND ALL
FUNCTIONS RESET TO THE QUIESCENT CONDITION 4HE NET
WORK FAULT IS CLEARED
)F THE FAULT HAS NOT BEEN CLEARED UNSUCCESSFUL !2
THEN THE SHORT
CIRCUIT PROTECTION CARRIES OUT A FINAL
DISCONNECTION IN THE STAGE THAT IS VALID FOR FINAL TRIP
REFER TO 3ECTION  !LSO EVERY FAULT DURING THE
RECLAIM TIME WILL RESULT IN FINAL DISCONNECTION
!FTER UNSUCCESSFUL !2 FINAL DISCONNECTION THE
LOCK
OUT TIME 4 ,/#+ 3ECTION  IS STARTED
&OR THIS TIME ANY CLOSE COMMAND FROM THE !2
FUNC
TION IS LOCKED
4HE ABOVE SEQUENCE COMES INTO EFFECT WITH SINGLE
SHOT 2!2 7ITH 3* MULTIPLE !2 ATTEMPTS UP
TO  $!2
SHOTS REFER 3ECTION  ARE ALSO POS
SIBLE
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