Siemens 7VK512

-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