minimize the risk of internal failures. Binary information based on the oil level in the circuit breakeris used as input signals to the function. In addition to that, the function generates alarms basedon received information.16.4 Breaker monitoring SSCBR16.4.1 Identification GUID-0FC081B2-0BC8-4EB8-9529-B941E51F18EE v7Function description IEC 61850identificationIEC 60617identificationANSI/IEEE C37.2device numberBreaker monitoring SSCBR - -16.4.2 Application GUID-45572680-3A39-4B3C-8639-4E4C5A95AA26 v8The 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 solution inassessing the condition of circuit breakers.Circuit breaker contact travel timeAuxiliary contacts provide information about the mechanical operation, opening time and closingtime of a breaker. Detecting an excessive traveling time is essential to indicate the need formaintenance of the circuit breaker mechanism. The excessive travel time can be due to problemsin the driving mechanism or failures of the contacts.Circuit breaker statusMonitoring the breaker status ensures proper functioning of the features within the protectionrelay such as breaker control, breaker failure and autoreclosing. The breaker status is monitoredusing breaker auxiliary contacts. The breaker status is indicated by the binary outputs. Thesesignals 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 a breakerdepends on the interrupted current. For breaker maintenance or replacement at the right time, theremaining life of the breaker must be estimated. The remaining life of a breaker can be estimatedusing the maintenance curve provided by the circuit breaker manufacturer.Circuit breaker manufacturers provide the number of make-break operations possible at variousinterrupted currents. An example is shown in Figure203.1MRK 511 358-UUS A Section 16Monitoring429Application manual
