-ETHOD OF OPERATION
6+
6
# ' #
4WO PROTECTION RELAYS WITH TWO AUTO RECLOSE DEVICES
)F A FEEDER IS EQUIPPED WITH DUPLICATED PROTECTION
AND EACH PROTECTION RELAY SHOULD CONTROL ITS OWN AU
TO RECLOSE DEVICE CERTAIN EXCHANGE OF INFORMATION
IS NECESSARY BETWEEN THE TWO COMBINATIONS 4HIS IS
SHOWN AS AN EXAMPLE IN &IGURE 4HREE POLE
COUPLING SHOULD BE ARRANGED WITH AN EXTERNAL COU
PLING UNIT WHICH INTERACTS DIRECTLY WITH THE CIRCUIT
BREAKER TRIP CIRCUITS 4HIS ENSURES THREE POLE TRIP
PING UNDER ALL CIRCUMSTANCES OF MULTI POLE FAULTS
'EN &AULT
4RIP ,
4RIP ,
4RIP ,
6+
,
,
,
,
,
,
,
,
,
,
ND !2
DEVICE
ND PROTECTION
RELAY
ST PROTECTION
RELAY
POLE
COUPLING
3
")
")
")
")
")
3
3
3
3
#
#
#
3
")
")
")
")
")
3
3
3
3
#
#
#
!2 BLOCK INT
!2 BLOCKED
!2 BLOCK INT
!2 BLOCKED
3TART !2
4RIP , FOR !2
4RIP , FOR !2
4RIP , FOR !2
3TART !2
4RIP , FOR !2
4RIP , FOR !2
4RIP , FOR !2
'EN &AULT
4RIP ,
4RIP ,
4RIP ,
4RIP ,
4RIP ,
4RIP ,
4RIP ,
4RIP ,
4RIP ,
, , ,
TO CIRCUIT BREAKER
")
"INARY INPUT
3
3IGNALLING OUTPUT
#
4RIP COMMAND
&IGURE #ONNECTION EXAMPLE FOR PROTECTION RELAYS WITH AUTO RECLOSURE DEVICES