Transformer BDV Test

It depends whether you are increasing the frequency or decreasing. In case you are increasing then you have to increase the voltage to get the BDV & vice versa. Its because of the voltage attaining zero. Due to increase in frequency the voltage passes through the zero position more frequently than in the case of decrease of frequency. Thats the explanation.

Dear Sir,

The Break down volatge is relvant to the Transforemr Oil. The Oil is subjected to high volatge and the break down volatge of oil at specific gap between the electrode where the flash over occurs is taken into account along with the time taken for breakdown of the oil. How frequency is having impact on oil cannot be understood.

Best Regards,

N.Suresh

hello Mr suresh,

U are saying frequency of applying voltage doesn't have any impact on the Breakdown voltage of transformer oil...It means can u get the same results of BDV voltage if u conduct the test on DC voltage and AC voltages at different frequencies..

My clarification is:

If you increase the frequency of applying voltage, the heat generated inside the oil chamber is more as compare to voltage of less frquency supplied voltage..

So the viscocity of oil decreases and hence the flashover occurs at a voltage which is more than the voltage at less frequency...

So frequency has definitely has an impact on the test..

what would you say???