Cb Condition Monitoring - GE MiCOM P40 Technical Manual

Chapter 16 - Monitoring and Control
5

CB CONDITION MONITORING

The device records various statistics related to each circuit breaker trip operation, allowing an accurate
assessment of the circuit breaker condition to be determined. These statistics are available in the CB CONDITION
column. The menu cells are register values only and cannot be set directly. They may be reset, however, during
maintenance. The statistics monitored are:
Total Current Broken: A register stores the total amount of current that the CB has broken is stored in an
●
accumulator, giving at any time a measure of the total amount of current that the CB has broken since the
value was last reset.
Number of CB operations: A counter registers the number of CB trips that have been performed for each
●
phase, giving at any time the total number of trips that the CB has performed since the value was last reset.
CB Operate Time: A register stores the total amount of time the CB has transitioned from closed to open is
●
stored in an accumulator, giving at any time a measure of the total time that the CB has spent tripping since
the values was last reset.
Excessive Fault Frequency: A counter registers the number of CB trips that have been performed for all
●
phases, giving at any time the total number of trips performed since the value was last reset.
These statistics are available in the CB CONDITION column. The menu cells are register values only and cannot be
set directly. They may be reset, however, during maintenance.
Note:
When in Commissioning test mode the CB condition monitoring registers are not updated.
Circuit breaker lockout, can be caused by the following circuit breaker condition monitoring functions:
Maintenance lockout
●
● Excessive fault frequency lockout
Broken current lockout
●
If the circuit breaker is locked out, the logic generates a lockout alarm
416
P446SV
P446SV-TM-EN-1