Alstom MiCOM P54 Series - 4.4 Circuit breaker state monitoring (P543;P545); 4.4.1 Circuit breaker state monitoring features (P543;P545)

Operation P54x/EN OP/La4
MiCOM P543, P544, P545 & P546 (OP) 5-157
OP
INTSIG AR SysCheck_Ok
INTSIG AR CheckSynch_OK
DDB_AR_CS_Check_OK (897)
SET: Check Sync 1 Close En
SET: Live Line/Dead Bus close
SET: Check Sync 1 Close En
DDB_CS1_OK (883)
P1390ENb
&
SET: Check Sync 2 Close En
DDB_CS2_OK (884)
&
DDB_Bus_Dead
DDB_Line_Live (888)
&
SET: Dead Line/Live Bus close
DDB_Bus_Live (886)
DDB_Line_Dead (889)
&
&
1
1
DDB_AR_Sys_Check_OK (899)
Figure 101 Auto-reclose/check sync interface (P543/P545)
If an external system check device is to be used with the internal auto-reclose function then
logic inputs are available for the purpose and can be assigned to opto-isolated inputs using
the PSL. These logic inputs are.
AR Check Synch OK
AR System Check OK/SYNC
4.4 Circuit breaker state monitoring (P54
3/P545)
The relay incorporates circuit breaker state monitoring, giving an indication of the position of
the circuit breaker, or, if the state is unknown, an alarm is raised.
4.4.1 Circuit breaker state monitoring features (P543/P545
)
MiCOM relays can be set to monitor normally open (52a) and normally closed (52b) auxiliary
contacts of the circuit breaker. Under healthy conditions, these contacts will be in opposite
states. Should both sets of contacts be open, this would indicate one of the following
conditions:
 Auxiliary contacts/wiring defective
 Circuit Breaker (CB) is defective
 CB is in isolated position
Should both sets of contacts be closed, only one of the following two conditions would apply:
 Auxiliary contacts/wiring defective
 Circuit Breaker (CB) is defective