-ETHOD OF OPERATION6+
6
#
' #
#ONTROL OF THE AUTO RECLOSE FUNCTION BY TWO PROTECTIVE RELAYS
&OR LINES WITH TWO PROTECTIVE RELAYS EG MAIN PROTEC
TION AND ALTERNATE PROTECTION THE AUTO
RECLOSE
FUNCTION CAN BE CONTROLLED BY BOTH FEEDER PROTECTION
RELAYS IN PARALLEL
4HE FOLLOWING INPUTS AND OUTPUTS OF 6+ ARE SUIT
ABLE FOR COMMUNICATION WITH THE PROTECTION RELAYS
4HE !2
FUNCTION CAN BE STARTED VIA THE BINARY IN
PUTS FROM BOTH FEEDER PROTECTION RELAYS CONNECTED
IN PARALLEL
3TART !2 'ENERAL START SIGNAL FOR !2
&.O
4RIP , !2 4RIPPING COMMAND , FOR !2
&.O
4RIP , !2 4RIPPING COMMAND , FOR !2
&.O
4RIP , !2 4RIPPING COMMAND , FOR !2
&.O
4HE GENERAL START SIGNAL IS THE CRITERION FOR THE START OF
THE ACTION TIME !T THE ISSUE OF THE TRIPPING COMMAND
IT IS DECIDED WHETHER THE DEAD TIME FOR SINGLE
POLE
!2 OR THREE
POLE !2 WILL BE EFFECTIVE OR IF RECLOSURE
IS BLOCKED FOR THREE
POLE TRIPPING DEPENDENT UPON
THE SET !2 PROGRAM 4HE !2 FUNCTION OF 6+ REC
OGNIZES A MULTI
POLE TRIP EVEN IN CASE EACH OF THE
FEEDER PROTECTION RELAYS DETECT A SINGLE
PHASE FAULT
BUT IN DIFFERENT PHASES
)F ONLY THREE
POLE !2 IS TO BE CARRIED OUT IT IS SUFFI
CIENT TO USE ANY CONVENIENT BINARY INPUT FOR THE TRIP
PING SIGNAL
!LTERNATIVELY THE FOLLOWING TRIP SIGNALS CAN BE INPUT
TO 6+ PROVIDED THESE ARE AVAILABLE FROM THE
FEEDER PROTECTION
4RIP P !2 4RIPPING COMMAND SINGLE
POLE FOR !2 &.O
4RIP P !2 4RIPPING COMMAND THREE
POLE FOR !2 &.O
)N THIS CASE THE DEAD TIME IS DERIVED FROM THESE SIG
NALS "UT WITH TWO PROTECTION RELAYS THE !2 FUNCTION
CANNOT RECOGNIZE WHETHER THE TWO SINGLE
POLE TRIP
COMMANDS HAVE BEEN OCCURRED IN THE SAME PHASE
SO THAT EXTERNAL MEASURES ARE NECESSARY TO BLOCK RE
CLOSURE AND TO COUPLE THE THREE POLES
4O COUPLE THE PROTECTION RELAYS THREE
POLE AND TO
RELEASE THEIR !2 STAGES IF AVAILABLE THE FOLLOWING
OUTPUT FUNCTIONS ARE SUITABLE
P 4RIP 0ERM !2 READY FOR SINGLE POLE RE
CLOSURE LOGICAL INVERSION OF
THREE
POLE COUPLING &.O
2!2 :ONE 2EL !2 IS READY FOR AN 2!2 CYCLE
IE RELEASES 2!2 ZONE FOR THE
EXTERNAL PROTECTION RELAY &.O
$!2 :ONE 2EL !2 IS READY FOR A $!2 CYCLE
IE RELEASES $!2 ZONE FOR THE
EXTERNAL PROTECTION RELAY &.O
2!2 P 0ROG 2!2 PROGRAMMED TO SINGLE
POLE RECLOSURE ONLY IE RE
CLOSES ONLY AFTER SINGLE
POLE
TRIP &.O
6+ ISSUES NO PERMISSION FOR SINGLE
POLE TRIP
IE PERFORMS THREE
POLE COUPLING WHEN TRIP SIG
NALS OCCUR IN MORE THAN ONE PHASE THUS IN CASE
EACH OF THE FEEDER PROTECTION RELAYS TRIPS A SINGLE
PHASE FAULT BUT IN DIFFERENT PHASES THREE POLE TRIP
PING WILL BE EFFECTED
$EPENDING ON THE ACTUAL APPLICATION AND THE USED
FUNCTIONS OF THE AUTO
RECLOSE FUNCTION ONE OR THE
OTHER INPUT OR OUTPUT CAN BE OMITTED %G FOR THREE
POLE !2 ONLY THE GENERAL START GENERAL TRIP SIGNALS
MUST BE INPUT AND
2!2 :ONE 2EL IS OUTPUT
FROM 6+
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