how to test a transformer winding?

To test a transformer winding, you can perform several methods. First, use a multimeter to check the resistance of the windings; this helps identify shorted or open circuits. Next, conduct an insulation resistance test using a megohmmeter to ensure the insulation is intact. Additionally, apply a low-voltage AC test to verify the winding’s turns ratio. Finally, perform a power factor test to assess insulation quality and overall winding condition.