how to perform transformer winding resistance test?

To perform a transformer winding resistance test, first, ensure the transformer is de-energized and isolated. Connect a precision ohmmeter or a low-resistance meter to the winding terminals. Measure the resistance of each winding by applying a test current, typically between 1A to 10A, depending on the transformer size. Record the readings, and compare them to the manufacturer’s specifications. This test helps identify issues like poor connections or damaged windings.