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Transformer Riddle No.75 - Impulse test on transformer with positive polarity
Normally impulse test shall be conducted on transformer with negative polarity.
If we want to conduct impulse test with positive polarity what are the measures which are to be considered and what are the extra precautions which are to be taken in design and in the testing of the transformer.  
Author : M.RAJKUMAR - From: India
Sun, August 21st, 2011 - 16:00
As I have seen, many reference book states that for oil-immersed transformers the test voltage is normally of negative polarity since this reduces the risk of erratic external flashover
Author : Hamid - From: Iran-firouzabad fars
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