how to test earthing transformer?

To test an earthing transformer, first ensure that the transformer is de-energized and isolated from the system. Use an insulation resistance tester to check the insulation resistance between the windings and the ground. Next, perform a continuity test on the grounding connections to ensure they are intact. Additionally, you can conduct a power factor test to assess the transformer’s condition. Finally, verify the transformer’s voltage and current ratings during operation to ensure proper functionality.