Application Notes
P44x/EN AP/E33
MiCOM P441/P442 & P444
Page 157/220
4.6.2.2
Outputs
CB Status Alarm
Picks up when CB Discrepancy status is detected after CBA timer issued externally by opto
or internally by CB Aux
CB aux A
CB aux B
CB aux C
Pole A+B+C detected Dead pole by internal logic or CB status
Any Pole Dead
The DDB Any Pole Dead if assigned in the PSL, indicates that one or more poles is open
All Pole Dead
The DDB All Pole Dead if assigned in the PSL, indicates that all pole are dead (All 3 poles
are open)
4.7 Circuit
breaker
condition monitoring
Periodic maintenance of circuit breakers is necessary to ensure that the trip circuit and
mechanism operate correctly, and also that the interrupting capability has not been
compromised due to previous fault interruptions. Generally, such maintenance is based on a
fixed time interval, or a fixed number of fault current interruptions. These methods of
monitoring circuit breaker condition give a rough guide only and can lead to excessive
maintenance.
The relays record various statistics related to each circuit breaker trip operation, allowing a
more accurate assessment of the circuit breaker condition to be determined. These
monitoring features are discussed in the following section.
4.7.1
Circuit Breaker Condition Monitoring Features
For each circuit breaker trip operation the relay records statistics as shown in the following
table taken from the relay menu. The menu cells shown are counter values only. The
Min/Max values in this case show the range of the counter values. These cells can not be
set:
Menu text
Default setting
Setting range
Step size
Min
Max
CB CONDITION
CB Operations
{3 pole tripping}
0 0
10000
1
CB A Operations
{1 & 3 pole tripping}
0 0
10000
1
CB B Operations
{1 & 3 pole tripping}
0 0
10000
1
CB C Operations
{1 & 3 pole tripping}
0 0
10000
1
Total IA Broken
0
0
25000In^
1
Total IB Broken
0
0
25000In^
1
Total IC Broken
0
0
25000In^
1In^
CB Operate Time
0
0
0.5s
0.001
Reset All Values
No
Yes, No
Содержание MiCOM P441
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