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1)Why potential transformer primary site grounded?
2)can be loop between neutral & body for grounding?
3)What is the difference between ELCB &RCCB?
4)Why we use iron core in transformer insted of wooden core?
5)what is the principle of excitation?
6)Why we test the core balance test for transformer?
7)what is creepage?What is the creepage length for
insulators at different voltages?
8)How much type of relays used for differential protection
of generator,transformer & busbar protection?
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Answer Posted / abcd
ELCB detects phase to earth faults.It can detect low impedence faults but on the contrary if there occurs a high impedence fault in the system then the fault current may be very small. Such faults are detected by RCCB.
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