Answer Posted / murali karri

Always we talk about the potential by taking some reference it may be a ground or neutral. If there is no phase difference b/w those two 230v then the potential difference will be zero and no current will flow through filament.

how to calculate differential current when we testing differential relay..suppose we have 1000kw generator,630amp VCB,what value we should put /inject so that relay trip the VCB? PLLZ justify ur comment

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