Answer Posted / shiva

kva is active power+ reactive power
the really used power is active power only.
which is v*i*cos pi.
but we dont know user's power factor so ratings are kva for t/f.

when we design electrical schemes of 11/.415kv distribution..wen and were should we show the relays??what is the function of it?for example..we place EFR Relay CT between transformer neutral link and transformer earth.Like this what are the other type of relays we should use?why?where?Explain please..Thank you

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