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  Breakdown Value (BDV) For the Oil

Introduction to the Breakdown Value (BDV) For the Oil

For filling in transformers good oil should withstand at least 40 kV (in the above condition (vi- a)) for one minute. If it is fairly dry, the BDV (break down value) could be as high as 50 kV or even 60 kV. While oil is filled into a transformer tank and permitted to rest for various days, it will frequently be found that test conducted on a sample consequently drawn from the tank will provide a much lower BDV (break down value) than before. This is since the dry oil that is filled in absorbs any moisture that may be exists inside the tank or the windings. If the BDV (break down value) remains very almost the same as before, it shows that the windings are fairly dry. Like a general thumb rule, the minimum BDV (break down value) for energizing any transformer rated 33 kV or below is 30 kV. For high voltages the minimum BDV (break down value) is 40 kV. If it is lower, it is essential to dry out the transformer through one of the methods explained earlier, until BDV of 40 kV or more is acquired. For switch oil in circuit breakers or motor starters, etc. a lower BDV (break down value) is allowable but a minimum of 30 kV should be maintained.

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