Answer / santosh bangar

oil sample from top which is heated..and bottom oil which is
cool ..so if we take sample from bottom then that have more
BDV than sample from top.. but practically there is minor
difference .

Answer / r.k.pandey

Depends on density,bottom oil sample have more density than up per side of area transformer.if every where inside the transformer temperature is the same. no more difference.

why is the vector group analysis done in transformer tests

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