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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 / arb555
1) Usaully relays are connectd in 2ndary . SO to detect faults
2) no
3)ELCB detects phase to earth faults
RCCB - trips if net current is not zero
4) to incresae the permeability
if air used-air core
iron -iron core
no wood- its an insulator
5) Dc fiels required in generators for excitation.
7)I think its the distance b/w insulaotors.
8) Merz pRice circulating current basd relays are common
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