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-ETHOD OF OPERATION
6+
6
# ' #
3ELECTIVITY DURING AUTOMATIC RE
CLOSURE
&OR THE AUTO RECLOSURE SEQUENCE TO BE SUCCESSFUL
FAULTS ON ANY PART OF THE LINE MUST BE CLEARED FROM
BOTH LINE ENDS WITHIN THE SAME
SHORTEST POSSI
BLE
TIME 5SUALLY THEREFORE AN INSTANTANEOUS
STAGE OF THE SHORT CIRCUIT PROTECTION IS SET TO OPERATE
BEFORE A RECLOSURE BY THE !2 UNIT
)F THE SHORT CIRCUIT PROTECTION IS EQUIPPED WITH A
SO CALLED 2!2 STAGE THEN THIS STAGE CAN BE ACTI
VATED BY 6+ THE OUTPUT SIGNAL
2!2 :ONE
2EL
IS AVAILABLE AS LONG AS THE 2!2 FUNCTION IS
READY FOR RECLOSE AFTER DISCONNECTION OF THE LINE
)F THE FEEDER PROTECTION INCORPORATES THE FACILITY TO AC
TIVATE ITS 2!2 STAGE ONLY IN CASE OF SINGLE PHASE
FAULTS BUT NOT IN CASE OF THREE PHASE FAULTS THE 2!2
FUNCTION OF 6+ CAN GIVE THE OUTPUT SIGNAL
2!2
P 0ROG
IN ADDITION TO
2!2 :ONE 2EL
WHICH
MEANS THAT THE 2!2 FUNCTION WILL RECLOSE ONLY IN CASE
OF SINGLE POLE TRIP BUT NOT AFTER THREE POLE TRIP THAT
IS THE CASE WHEN THE 2!2 FUNCTION IS PROGRAMMED TO
SINGLE POLE AUTO RECLOSURE
)F THE FEEDER PROTECTION IS EQUIPPED WITH AN ADDITION
AL SO CALLED $!2 STAGE THIS CAN BE ACTIVATED BY
6+ THROUGH THE OUTPUT SIGNAL
2!2
:ONE
2EL
WHICH IS PRESENT AS LONG AS THE $!2 FUNCTION
IS READY TO RECLOSE AFTER DISCONNECTION OF THE LINE
)F NO RECLOSURE IS EXPECTED EG CIRCUIT BREAKER NOT
READY FOR A TRIP CLOSE CYCLE OR ACTION TIME EXPIRED
THEN THE ABOVE MENTIONED RELEASE SIGNALS ARE NOT IS
SUED 4HE FEEDER PROTECTION THEN HAS TO OPERATE AC
CORDING TO THE TIME GRADING PLAN IN ORDER TO ACHIEVE
SELECTIVITY
)T IS POSSIBLE TO BLOCK THE !2 FUNCTIONS IN COMMON OR
SEPARATE FOR 2!2 OR $!2 FROM EXTERNAL CRITERIA IE
FROM THE PLANT OR FROM OTHER PROTECTION DEVICES 4HE
RELEASE SIGNALS OF 6+ ARE NOT ISSUED IN THIS CASE
EITHER
4HE AUTO RECLOSE FUNCTION PROVIDES AN ACTION TIME
FOR EACH OF 2!2 AND $!2 FUNCTION WHICH CAN SEPA
RATELY SET 4HE ACTION TIMES ARE STARTED WITH ANY FAULT
DETECTION OF A SHORT CIRCUIT PROTECTION WHICH SHALL
TRIGGER THE !2 FUNCTION )F THE ACTION TIME HAS ELAPSED
BEFORE ANY TRIP SIGNAL IS GIVEN IT IS ASSUMED THAT THE
FAULT IS NOT ON THE PROTECTED LINE BUT ON A DIFFERENT
LINE AUTO RECLOSURE IS NOT INITIATED
!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
4RIPPING AFTER FAULTS WHICH ARE CLEARED IN A DELAYED
TIME SHOULD FOR REASONS OF SELECTIVITY REFER FOREGO
ING SECTION NOT RESULT IN AN AUTO RECLOSURE EITHER
4HE !2 FUNCTIONS OF 6+ ARE PROVIDED WITH SET
TABLE ACTION TIMES SEPARATE FOR 2!2 AND $!2 WHICH
ARE STARTED BY THE FAULT DETECTION SIGNAL OF THE FEEDER
PROTECTION )F AFTER EXPIRY OF THE ACTION TIME NO TRIP
PING SIGNAL HAS BEEN GIVEN RECLOSURE IS BLOCKED
4HE !2 FUNCTIONS OF 6+ ARE PROVIDED WITH
THREE SETTABLE RECLAIM TIMES WHICH DO NOT DISCRIMI
NATE BETWEEN 2!2 AND $!2 'ENERALLY THE RECLAIM
TIME IS THE TIME PERIOD DURING WHICH NO FURTHER RECLO
SURE ATTEMPT 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 AFTER DYNAMIC BLOCKING 4",/#+
$9. IS THE TIME PERIOD DURING WHICH ANY FURTHER
CLOSE COMMAND BY THE 6+ RELAY IS BLOCKED AFTER
FINAL DISCONNECTION 4HIS APPLIES FOR ALL CLOSING AT
TEMPTS WHICH ARE PERFORMED BY THE RELAY )F THIS TIME
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
! SPECIAL RECLAIM TIME 4",/#+ -# IS PROVIDED FOR
MANUAL CLOSING $URING THIS TIME AFTER MANUAL CLOSE
RECLOSURE IS BLOCKED ANY TRIP COMMAND WILL BE A FINAL
THREE POLE TRIP