It has three phase over current and earth fault protection. It is programmable operating characteristics; programmable auto reclosing facility.
It is independent trip sequence setting (IDMT / Def. time); under voltage blocking for breaker close; trip counter; fault zone indication; breaker inal-operation indication; it has auto/manual control; breaker status indication; trivector meter to record energy and load parameters; ammeter and voltmeter with selector switch; separate cabinets for control unit and meter unit, which are mechanically fastened together; cabinet suitable for different types of pole mounting.
Its application include: Electrical power for rural areas is supplied by 11kV overhead lines. It has exposed to several faults like, lightning, heavy wind, fall of tree branches, fault created by animals / birds etc. When a fault occurs, the protection system trips the circuit breaker to prevent / minimize the damage.
It is expected to locate the fault, clear and then restore the supply by reclosing the circuit breaker. It takes more time between power outage and restoration. More than 70% of the faults are observed to be temporary / transient in nature. Hence, power outage time can be reduced if the reclosing function is automated and carefully planned.
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