ABB Relion 650 Series Applications Manual page 213

1MRK 505 287-UUS B
When the level becomes too low, compared to the required value, the circuit breaker operation is
blocked to minimize the risk of internal failures. Binary information based on the oil level in the
circuit breaker is used as input signals to the function. In addition to that, the function generates
alarms based on received information.
12.12 Circuit breaker condition monitoring SSCBR
12.12.1 Identification
Function description
Circuit breaker condition monitoring
12.12.2 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.
Breaker contact travel time
High travelling times indicate the need for maintenance of the circuit breaker mechanism.
Therefore, detecting excessive travelling time is needed. During the opening cycle operation, the
main contact starts opening. The auxiliary contact A opens, the auxiliary contact B closes, and the
main contact reaches its opening position. During the closing cycle, the first main contact starts
closing. The auxiliary contact B opens, the auxiliary contact A closes, and the main contact reaches
its close position. The travel times are calculated based on the state changes of the auxiliary
contacts and the adding correction factor to consider the time difference of the main contact's
and the auxiliary contact's position change.
Operation counter
Routine maintenance of the breaker like the lubricating breaker mechanism, is generally based on
a number of operations. A suitable threshold setting, to raise an alarm when the number of
operation cycle exceeds the set limit, helps preventive maintenance. This can also be used to
indicate the requirement for oil sampling for dielectric testing in case of an oil circuit breaker.
The change of state can be detected from the binary input of the auxiliary contact. There is a
possibility to set an initial value for the counter which can be used to initialize this functionality
after a period of operation or in case of refurbished primary equipment.
Busbar protection REB650
Application manual
IEC 61850
identification
SSCBR
© Copyright 2013 ABB. All rights reserved
IEC 60617 ANSI/IEEE C37.2
identification device number
- -
Section 12
Monitoring
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