Answer Posted / a.narayanan.

RELAY IS AN ELECTRONIC OR ELECTRO MECHANIC DEVICE.IT CAN
OPERATE NORMAL OR ABNORMAL CONDITION TO TRIP THE C.B UNDER
PRESET VALUES IN ITSELF.

BUT CONTACTOR OPERATION NOT LIKE RELAY OPERATION.
IT CAN OPERATE ONLY BY CONTROL VOLTAGE IN SOME OF THE CIRCUIT.

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if a 3phase 100kva distribution transformer , 400 v,50 hz, 4-wire system is loaded at 160 k.w mostly 1-phase Lighting & Airconditioning split a.c load what will be the net effect on the power system in terms of voltage, powerfactor, current , efficiency of xformer

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