1MAC309294-MB F Section 6Condition monitoring functionsRER620 361Technical ManualFigure 194: Functional module diagram for calculating inactive days and alarm forcircuit breaker operation monitoringInactivity timerThe module calculates the number of days the circuit breaker has remained inactive, thatis, has stayed in the same open or closed state. The calculation is done by monitoring thestates of the POSOPEN_A(_B,_C) and POSCLOSE auxiliary contacts.The inactive days is available through the Monitored data view. It is also possible to setthe initial inactive days by using the parameter.Alarm limit checkWhen the inactive days exceed the limit value defined with the setting, the alarm isinitiated. The time in hours at which this alarm is activated can be set with the parameteras coordinates of UTC. The alarm signal can be blocked by activating the binary inputBLOCK.6.1.4.3 Breaker contact travel timeThe breaker contact travel time module calculates the breaker contact travel time for theclosing and opening operation. The operation of the breaker contact travel timemeasurement can be described by using a module diagram. All the modules in the diagramare explained in the next sections.Inactivitytimer (A)POSOPEN_APOSCLOSE _ABLOCKAlarm limitcheck MON_ALMInactivitytimer (B)POSOPEN_BPOSCLOSE _BInactivitytimer (C)POSOPEN_CPOSCLOSE_CThis subfunction requires two position inputs POSOPEN_A(_B,_C) andPOSCLOSE_A(_B,_C) from the circuit breaker.
