Circuit Breaker Operation Monitoring - ABB Relion Technical Manual

Generator protection

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breaker status monitoring can be described 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, error state 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 502 048-UUS A

Technical manual

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650 series Reg650 ansi