Answer / logan

in india we've got the more resources for producing
electricity. and also if we use the 50hz,220v the losses
will be less and we can save more power.

but in case of USA, they're using 60hz frequency as the
resources are very less for power production. and they cant
mind for the losses.

I did oil BDV test of 1600 KVA trafo 20KV/400V as per IEC 156. Result is 1) 58 KV 2) 58 KV 3)40 KV 4) 50 KV 5) 58 KV 6) 18 KV. Avr is 47 KV. Can we say oil is still ok even in the 6th test BDV is 18 KV ?

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