Answer Posted / abdul

It depends on the how much the power factor has to be improved
simple calculation would be
Kvar = KW [tan (cos inverse (old pf) - tan (cos inverse (new required pf)

From past few months I am getting lagging pf even though sufficient capacitors used in circuit. Where is the problem pls answer

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A 100 kVA , 400 v/250 kv testing transformer has 8% leakage reactance and resistance on 100 KVA base . A cable has to be tested at 500 kv using the above transformer as a resonant transformer at 50 hz . if the charging current of the cable at 500 kv is 0.4 A find the series inductance required . Assume 2% resistance for the inductor to be used and the connecting leads . Neglect dielectric loss of hte cable . what will be the input voltage to the transformer ?

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