How do you insure that you won't damage the transformer when testing the insulation at 500V DC?

How do you insure that you won't damage the transformer when testing the insulation at 500V DC?

This question was generated from another article in this blog:
HOW DO YOU MEASURE THE INSULATION VALUE OF A RESISTANCE WELDING TRANSFORMER?

?Meggar Tester

            MEGGAR TESTER

The original article describes how to measure the insulation condition of a transformer. This is very important since the insulation is very thin and its failure makes the machine inoperable.
The question is how do you test without causing the damage. The answer was in the original article in the last sentence.

This type of testing should be performed by personnel trained to test transformers. Transformer manufactures can perform this test.

Reference: RWMA Resistance Welding Manual 4th Edition

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