Application - ABB RELION 650 Series Applications Manual

1MRK 505 363-UEN A
Function description
Breaker monitoring
15.4.2

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 144.
Application manual
IEC 61850 IEC 60617
identification identification
SSCBR -
Section 15
Monitoring
ANSI/IEEE C37.2
device number
-
GUID-45572680-3A39-4B3C-8639-4E4C5A95AA26 v9
293