A071113 V2 ENFigure 340: 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. ThePRES_ALM alarm 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 withthe Pres lockout time setting. The PRES_LO alarm can be blocked by activatingthe BLOCK 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, whetherthe breaker is in an open, closed or intermediate position.Circuit breaker operation monitoringThe purpose of the circuit breaker operation monitoring is to indicate that thecircuit breaker has not been operated for a long time. The function calculates thenumber of days the circuit breaker has remained inactive, that is, has stayed in thesame open or closed 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 Aopens, the auxiliary contact B closes and the main contact reaches its openingposition. During the closing cycle, the first main contact starts closing. Theauxiliary contact B opens, the auxiliary contact A closes and the main contactSection 7 1YHT530004D05 DCondition monitoring functions616 615 seriesTechnical Manual
