Circuit Breaker Operation Monitoring - ABB REG650 Technical Manual

Generator protection

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the breaker status monitoring can be described by using a module diagram. All the

modules in the diagram are explained in the next sections.

GUID-60ADC120-4B5A-40D8-B1C5-475E4634214B-ANSI V1 EN

Functional module diagram for monitoring circuit breaker status

BLOCK and BLK_ALM inputs

Phase current check

This module compares the three phase currents with the setting AccDisLevel. If the

current in a phase exceeds the set level, information about phase is reported to the

contact position indicator module.

Contact position indicator

The circuit breaker status is open if the auxiliary input contact POSCLOSE is low, the

POSOPEN input is high and the current is zero. The circuit breaker is closed when the

POSOPEN input is low and the POSCLOSE input is high. The breaker is in the

intermediate position if both the auxiliary contacts have the same value, that is, both

are in the logical level "0" or "1", or if the auxiliary input contact POSCLOSE is low

and the POSOPEN input is high, but the current is not zero.

The status of the breaker is indicated with the binary outputs CBOPEN, CBINVPOS

and 52a for open, intermediate and closed position respectively.

Circuit breaker operation monitoring

The purpose of the circuit breaker operation monitoring subfunction is to indicate if the

circuit breaker has not been operated for a long time.

The operation of the circuit breaker operation monitoring can be described by using a

module diagram. All the modules in the diagram are explained in the next sections.

1MRK 502 043-UUS B

Technical Manual