Bexwala Circwitê Şûrên Tripê

Dibe xelatên din jî yên di cihan de qonşan bi bir trip circuit û electrical circuit breaker. Hûn dikarin vê xelatên dina nekirin bideyên ku hûn nekirin trip bideyan jî û tevahî current ji bo power contacts yê we. Wan şertan divê ku hûn nekirin trip bideyan jî û tevahî current ji bo power contacts yê we. Wan şertan divê ku gas pressure ên berbi û air pressure ên pneumatic operated circuit breaker an. Li wan şertan trip coil û CB nekirin energized bideyan jî. Di navbera gas pressure û air pressure relays de divê ku NO contacts qonşan bi trip coil. Yek scheme ya din ya trip coil û û nekirin re-energized bideyan jî li dema ku CB opened bide. Li navbera trip circuit û CB divê ku bi terminal contacts û relay, control panel û circuit breaker kiosk.

Li dema ku her terminal contact û nayê qonşan bi trip circuit, CB nekirin trip bide. Nêzîkî, li dema ku DC supply û trip circuit nayê, CB nekirin trip bide. Ji bo rêzikirina wan şertan, trip circuit supervision bêyî nehatiya. Wê şekil û şertan trip circuit healthy scheme. Li wê şertan series combination of one lamp, one push bottom and one resistor qonşan bi protective relay contact. Li wê şertan her contact û protective relay contact nayê qonşan. Li dema ku push bottom (PB) pressed bide, trip circuit supervision network completed bide û lamp glows indicating that the breaker is ready for tripping.

Wê şemaya ji bo supervision di dema ku circuit breaker closed bide. Wê şemaya hatine post close supervision. Divê ku şemaya din hatine pre and post close supervision.

Wê şemaya trip circuit supervision û bêyî nehatiya. Tikandin û ya din ya ku NC contact û auxiliary switch qonşan bi auxiliary NO contact û trip circuit. Auxiliary NO contact closed bide li dema ku CB closed bide û auxiliary NC contact closed bide li dema ku CB open bide. Li dema ku circuit breaker closed bide, trip circuit supervision network completed bide via auxiliary NO contact û li dema ku circuit breaker open bide, same supervision network completed bide via NC contact. Resistor used series with the lamp for preventing unwanted tripping of circuit breaker due to internal short circuit caused by failure of the lamp.

Li dema ku trip circuit supervision scheme ji bo locally controlled installation, relay system necessary bide. Şekil û şemaya trip circuit supervision scheme ji bo remote signal required.

Li dema ku trip circuit healthy û circuit breaker closed bide, relay A energized bide û NO contact A1 closed bide û relay C energized bide. Energized relay C keeps NC contact in open position. Li dema ku circuit breaker open bide, relay B energized bide û No contact B1 closed bide û relay C energized bide. As C energized bide, it keeps the NC contact C1 in open position. While CB is closed, if there is any discontinuity in the trip circuit relay A is de-energized which opens contact A1 and consequently relay C is de-energized and which make the NC contact C1 in close position and hence alarm circuit is actuated. Trip circuit supervision is experienced by relay B with the circuit breaker is open in a similar manner as relay A with the circuit breaker is closed. Relays A and C are time-delayed by copper slugs to prevent spurious alarms during tripping or closing operations. The resistors are mounted separately from the relays and their values are chosen such that if any one component is inadvertently short-circuited, a tripping operation will not take place.

The alarm circuit supply should be separated from main trip supply so that the alarm can be actuated even the trip supply failed.

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