how to hipot test a transformer?

To perform a hipot test on a transformer, first ensure the transformer is disconnected from any power source. Connect the hipot tester’s high-voltage lead to the transformer’s primary winding and the ground lead to the transformer’s core or frame. Set the tester to the appropriate voltage level, typically 1.5 times the rated voltage, and initiate the test. Monitor the current; a low leakage current indicates insulation integrity. After testing, discharge the transformer safely before reconnecting it.