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Answer Posted / santosh kumar jha
BDV means break down voltage.
This is the test of di-electric strength of transformer oil.
The sample is taken in electrolysis pot and applied a
voltage diff between anode and cathode of the pot , the
diff between the two plate is 2.5 mm.At first we appling
the voltage diff gradually , the voltage near which the oil
looses its insulation property, that voltage is called BDV.
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