Setting The Thresholds For The Operating Time; Setting The Thresholds For Excesssive Fault Frequency - GE MiCOM P40 Agile Technical Manual

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SETTING THE THRESHOLDS FOR THE OPERATING TIME

Slow CB operation indicates the need for mechanism maintenance. Alarm and lockout thresholds (CB Time Maint

and CB Time Lockout) are provided to enforce this. They can be set in the range of 5 to 500 ms. This time relates to

the interrupting time of the circuit breaker.

Persistent faults will generally cause autoreclose lockout, with subsequent maintenance attention. Intermittent

faults such as clashing vegetation may repeat outside of any reclaim time, and the common cause might never be

investigated. For this reason it is possible to set a frequent operations counter, which allows the number of

operations Fault Freq Count over a set time period Fault Freq Time to be monitored. A separate alarm and lockout

threshold can be set.

P14D-TM-EN-8

Chapter 14 - Monitoring and Control