Recent questions tagged isolator

Description : Sequence of operation of isolator and circuit breaker while opening and closing

Last Answer : Sequence of operation of Isolator and C.B while opening & closing is as below:  While Opening:   1. Open circuit breaker  2. Open Isolator  3. Close earthing switch  While Closing:  ... breaker is open  2. Open earthing switch  3. Close isolator  4. Close circuit breaker

Description : Write working of opto coupler as an isolator.

Last Answer : Optocoupler is as shown in fig. it consist of LED as an light source and phototransistor act as light detector.  When input pulse is applied LED turns ON.Light emitted by LED focused on CB ... starts flowing.As input pulse reduces to zero LED turns OFF collector current becomes zero. 

Description : Isolator in substation is open under ___________ condition?  (A) No load (B) Short circuit (C) Full load (D) None of the above

Last Answer : no load

Last Answer : An isolator is installed generally on both sides of a circuit breaker.