Answer / iamdon

The Differentially compounded DC generator is employed for
welding purposes.The reason is stated as follows.

The Differentially compounded DC generator has very much
drooping characteristic.Thus terminal voltage falls rapidly
with the increase in load current.In welding, the load
resitance is frequently varied by varying arc length.Under such
conditions the value of current should be more or less constant.

Author:arbelectbit@yahoo.com

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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