Section 8 Condition monitoring functions
8.1 Circuit breaker condition monitoring SSCBR
8.1.1 Identification
Table 81: Function identification
IEC 61850 identification: SSCBR
IEC 60617 identification: CBCM
ANSI/IEEE C37.2 device number: CBCM
8.1.2 Functionality
The circuit breaker condition monitoring function (SSCBR) is used to monitor
different parameters of the circuit breaker. The breaker requires maintenance when
the number of operations has reached a predefined value. For proper functioning of
the circuit breaker, it is essential to monitor the circuit breaker operation, spring
charge indication, breaker wear, travel time, number of operation cycles and
accumulated energy. The energy is calculated from the measured input currents as a
sum of I
y
t values. Alarms are generated when the calculated values exceed the
threshold settings.
The function contains a blocking functionality. It is possible to block the function
outputs, if desired.
8.1.3 Application
SSCBR includes different metering and monitoring subfunctions.
Circuit breaker status
Circuit breaker status monitors the position of the circuit breaker, that is, whether the
breaker is in an open, closed or intermediate position.
Circuit breaker operation monitoring
The purpose of the circuit breaker operation monitoring is to indicate that the circuit
breaker has not been operated for a long time. The function calculates the number of
days the circuit breaker has remained inactive, that is, has stayed in the same open or
closed state. There is also the possibility to set an initial inactive day.
1MRS756378 D Section 8
Condition monitoring functions
REF615 201
Application Manual
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