Siemens 7VK512

-ETHOD OF OPERATION6+
6

#
' #
 )NTERROGATION FOR READINESS OF
THE CIRCUIT BREAKER
0RE CONDITION FOR A RECLOSE ATTEMPT AFTER SHORT CIR
CUIT INTERRUPTION IS THAT THE CIRCUIT BREAKER IS READY FOR
AT LEAST ONE 42)0
#,/3% 42)0 CYCLE WHEN THE
!2 FUNCTION IS INITIATED IE AT THE INSTANT OF TRIP COM
MAND 4HE READINESS INFORMATION FROM THE BREAKER
HAS TO BE TRANSMITTED TO THE DEVICE VIA A BINARY INPUT
)N CASE THAT SUCH READINESS INFORMATION IS NOT AVAIL
ABLE INTERROGATION CAN BE SUPPRESSED SINCE OTHER
WISE NO AUTO
RECLOSE WOULD BE POSSIBLE AT ALL
7HEN SINGLE
SHOT AUTO RECLOSURE IS PERFORMED IT IS
SUFFICIENT TO INTERROGATE THE BREAKER READINESS ONE
SINGLE TIME BEFORE INITIATION OF !2 !S FOR EXAMPLE
THE AIR PRESSURE FOR BREAKER OPERATION WILL COLLAPSE
DURING THE TRIP EXECUTION NO FURTHER INTERROGATION
SHOULD BE CARRIED OUT
7HEN MULTI
SHOT AUTO RECLOSURE IS USED IT IS AD
VANTAGEOUS TO INTERROGATE BREAKER READINESS NOT
ONLY AT THE INSTANT OF THE FIRST TRIP COMMAND BUT ALSO
BEFORE
EVERY RECLOSE ATTEMPT OR BEFORE EVERY OTHER
RECLOSE ATTEMPT )F THIS FACILITY IS SELECTED RECLOSURE
IS BLOCKED AS LONG AS THE CIRCUIT BREAKER IS NOT READY
FOR ANOTHER 42)0
#,/3% SEQUENCE
4HE RECOVERY TIME OF THE CIRCUIT BREAKER CAN BE SU
PERVISED BY THE 6+ RELAY 4HIS SUPERVISION TIME
4
#" 3506 WILL RUN AS LONG AS THE CIRCUIT BREAKER
DOES NOT INFORM ABOUT READINESS )N THIS CASE THE
DEAD TIME MAY BE EXTENDED WHEN THE BREAKER IS NOT
READY AFTER EXPIRY OF THE SET DEAD TIME "UT IF THE
BREAKER IS NOT YET READY AFTER EXPIRY OF THE SUPERVI
SION TIME THEN RECLOSURE IS BLOCKED 4HIS BLOCKING IS
CANCELED ONLY AFTER THE LOCK
OUT TIME 4",/#+ $9.
REFER 3ECTION  HAS ELAPSED )F 4",/#+ $9. IS
SET TO 0 CLOSING IS LOCKED OUT UNTIL THE !2 FUNCTION IS
RESET BY ENERGIZATION OF THE BINARY INPUT
!2 2E
SET
 !FTER THE RESET SIGNAL ALL FUNCTIONS RESET TO THE
QUIESCENT CONDITION
 4HREE POLE AUTO RECLOSURE
4HE 2!2 FUNCTION OF 6+ INFORMS THE FEEDER PRO
TECTION ABOUT READINESS FOR RECLOSURE BY ITS OUTPUT
SIGNAL
2!2 :ONE 2EL IN ORDER TO ALLOW THE FEED
ER PROTECTION TO TRIP IN ITS 2!2 ZONE IF AVAILABLE 4HE
ACTION TIME REFER TO 3ECTION  OF THE 2!2 FUNC
TION IS STARTED WITH THE FAULT DETECTION SIGNAL OF THE
FEEDER PROTECTION VIA THE BINARY INPUT
3TART !2 
4HE FEEDER PROTECTION TRIPS THREE
POLE FOR ALL FAULTS
WITHIN THE STAGE VALID FOR 2!2 EG THE DISTANCE PRO
TECTION IN OVERREACHING ZONE 4HE !2
FUNCTION OF
6+ IS INFORMED VIA ANY OF THE BINARY INPUTS
4RIP , !2  2!2 FUNCTION IS INITIATED PROVIDED
TRIPPING OCCURS WITHIN THE ACTION TIME REFER TO 3EC
TION  7ITH FAULT CLEARANCE THE SETTABLE DEAD
TIME 2!2 4
0/, COMMENCES FOR THREE POLE
2!2 SIMULTANEOUSLY THE SIGNAL
2!2 :ONE 2EL
DISAPPEARS /N EXPIRY OF THE DEAD TIME THE CIRCUIT
BREAKER RECEIVES A CLOSING COMMAND THE DURATION
OF WHICH IS SETTABLE AND THE SETTABLE 4HE 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 OF 6+ RESET TO THE QUIESCENT CONDI
TION 4HE NETWORK FAULT IS CLEARED THE !2 FUNCTIONS
ARE READY FOR A NEW FAULT
)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 WITHOUT 2!2
!LSO EVERY FAULT DURING THE RECLAIM TIME WILL RESULT IN
FINAL DISCONNECTION
!FTER UNSUCCESSFUL !2 FINAL DISCONNECTION THE
LOCK
OUT TIME 4",/#+ $9. 3ECTION  IS
STARTED &OR THIS TIME ANY CLOSE COMMAND FROM
6+ IS LOCKED
4HE ABOVE SEQUENCE COMES INTO EFFECT WITH SINGLE
SHOT 2!2 7ITH 6+ MULTIPLE !2 ATTEMPTS UP
TO$!2
SHOTS REFER TO 3ECTION  ARE ALSO POS
SIBLE !DDITIONALLY IT IS POSSIBLE TO SKIP THE 2!2 CYCLE
BY A SIGNAL VIA A BINARY INPUT OF THE DEVICE )N THIS
CASE ONLY $!2 IS EFFECTIVE REFER TO 3ECTION 