Circuit Breaker Operation Monitoring - ABB RET650 Technical Manual

1MRK 504 135-UEN A
14.17.7.2
Technical manual
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Figure 217: 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 CBCLOSED 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.
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Figure 218: Functional module diagram for calculating inactive days and alarm
for circuit breaker operation monitoring
Section 14
Monitoring
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