Help on Transformer Test

You might at least enter the words "tan delta" into the Search this Forum box on the right, Mildred. All will be revealed.

I tried it and wound up on a nude beach.

That's silly. Funny, but still silly.

"Silly" is my only defense against the possible atrocities I see here, were potentially hazardous situations involving seemingly lead poisoned humanoids are at the controls of operations, systems or processes that would threaten the lives of dense populations

Don't bother with these tests.

The data would only be needed in case that transformer explodes, killing innocent bystanders.

it is amazing how well patchouli oil burns!

A good answer. I would only add that the test frequency is generally less than 0.1 Hz, and that the test voltage should be started off at no more than the transformer windings' rated values and gradually increased (up to X2) if, and only if, the plotted graph reveals a nominally straight horizontal line, it will rise a bit with elevated voltage, but will do so more sharply if the insulation is compromised). Any tendency for the dissipation factor values to rise indicates lowered insulation resistance.

Follow the testing instructions carefully, especially with regards to isolation and jumpering, as very strange results can be had if not followed explicitly.

The tan delta test should always be carried out as part of new transformer acceptance so that benchmarks for future insulation testing can be set.

Thanks Team