ABB REG670 Applications Manual

17.4 Breaker monitoring SSCBR
17.4.1 Identification
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Breaker monitoring SSCBR - -
17.4.2 Application
The circuit breaker maintenance is usually based on regular time intervals or the
number of operations performed. This has some disadvantages because there could be
a number of abnormal operations or few operations with high-level currents within the
predetermined maintenance interval. Hence, condition-based maintenance
scheduling is an optimum solution in assessing the condition of circuit breakers.
Circuit breaker contact travel time
Auxiliary contacts provide information about the mechanical operation, opening time
and closing time of a breaker. Detecting an excessive traveling time is essential to
indicate the need for maintenance of the circuit breaker mechanism. The excessive
travel time can be due to problems in the driving mechanism or failures of the contacts.
Circuit breaker status
Monitoring the breaker status ensures proper functioning of the features within the
protection relay such as breaker control, breaker failure and autoreclosing. The
breaker status is monitored using breaker auxiliary contacts. The breaker status is
indicated by the binary outputs. These signals indicate whether the circuit breaker is
in an open, closed or error state.
Remaining life of circuit breaker
Every time the breaker operates, the circuit breaker life reduces due to wear. The wear
in a breaker depends on the interrupted current. For breaker maintenance or
replacement at the right time, the remaining life of the breaker must be estimated. The
remaining life of a breaker can be estimated using the maintenance curve provided by
the circuit breaker manufacturer.
Circuit breaker manufacturers provide the number of make-break operations possible
at various interrupted currents. An example is shown in figure
312.
Section 17 1MRK 502 071-UEN -
Monitoring
638 Generator protection REG670 2.2 IEC and Injection equipment REX060, REX061, REX062
Application manual

ABB REG670 Specifications

General

Brand	ABB
Model	REG670
Category	Protection Device
Language	English