Function description IEC 61850identificationIEC 60617identificationANSI/IEEE C37.2device numberBreaker monitoring SSCBR - -13.4.2 Application GUID-45572680-3A39-4B3C-8639-4E4C5A95AA26 v9The circuit breaker maintenance is usually based on regular time intervals or the number ofoperations performed. This has some disadvantages because there could be a number ofabnormal operations or few operations with high-level currents within the predeterminedmaintenance interval. Hence, condition-based maintenance scheduling is an optimum solutionin assessing the condition of circuit breakers.Circuit breaker contact travel timeAuxiliary contacts provide information about the mechanical operation, opening time andclosing time of a breaker. Detecting an excessive traveling time is essential to indicate theneed for maintenance of the circuit breaker mechanism. The excessive travel time can be dueto problems in the driving mechanism or failures of the contacts.Circuit breaker statusMonitoring the breaker status ensures proper functioning of the features within theprotection relay such as breaker control, breaker failure and autoreclosing. The breaker statusis monitored using breaker auxiliary contacts. The breaker status is indicated by the binaryoutputs. These signals indicate whether the circuit breaker is in an open, closed or error state.Remaining life of circuit breakerEvery time the breaker operates, the circuit breaker life reduces due to wear. The wear in abreaker depends on the interrupted current. For breaker maintenance or replacement at theright time, the remaining life of the breaker must be estimated. The remaining life of a breakercan be estimated using the maintenance curve provided by the circuit breaker manufacturer.Circuit breaker manufacturers provide the number of make-break operations possible atvarious interrupted currents. An example is shown in figure 89.1MRK 504 158-UEN A Section 13Monitoring209Application manual
