Answer Posted / ramachandra reddy
On TRANSFORMER OIL BREAK DOWN VOLTAGE test is carried out which is done on field while filling the oil in transformer. This process is also called oil filtration.
1.Take sample from top of Transformer before filtration.
2.The BDV of oil should withstood min 50 KV
3.The gap between the test electrodes sample to be 2.5mm maintained
4.At least 5 sample(top/bottom) should be checked separately while filtration.
5. The samples should withstand 50 kv for 1 min.
5. Take the average of all the samples timings.You will get value.
7.Procedure
a.Voltage should be gradually increased from 0.
b. At one point Flash will take place and that point is
termed as Bread down Voltage
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