The operation of the subfunction can be described with a module diagram. All themodules in the diagram are explained in the next sections.A071113 V2 ENFigure 290: Functional module diagram for circuit breaker gas pressure alarmThe gas pressure is monitored through the binary input signals PRES_LO_IN andPRES_ALM_IN.Timer 1When the PRES_ALM_IN binary input is activated, the PRES_ALM alarm isactivated after a time delay set with the Pressure alarm time setting. The PRES_ALMalarm can be blocked by activating the BLOCK input.Timer 2If the pressure drops further to a very low level, the PRES_LO_IN binary inputbecomes high, activating the lockout alarm PRES_LO after a time delay set with thePres lockout time setting. The PRES_LO alarm can be blocked by activating theBLOCK input.7.1.5 ApplicationSSCBR includes different metering and monitoring subfunctions.Circuit breaker statusCircuit breaker status monitors the position of the circuit breaker, that is, whether thebreaker is in an open, closed or intermediate position.Circuit breaker operation monitoringThe purpose of the circuit breaker operation monitoring is to indicate that the circuitbreaker has not been operated for a long time. The function calculates the number ofdays the circuit breaker has remained inactive, that is, has stayed in the same open orclosed state. There is also the possibility to set an initial inactive day.Breaker contact travel timeHigh traveling times indicate the need for the maintenance of the circuit breakermechanism. Therefore, detecting excessive traveling time is needed. During theopening cycle operation, the main contact starts opening. The auxiliary contact A1MRS758755 A Section 7Condition monitoring functionsREC615 and RER615 545Technical Manual
