how to test dry type transformer?

To test a dry type transformer, follow these steps: First, perform a visual inspection for any physical damage or signs of overheating. Next, conduct insulation resistance testing using a megohmmeter to ensure the insulation is intact. Then, measure the transformer’s turns ratio with a turns ratio tester to verify proper winding ratios. Finally, perform a power factor test to assess insulation quality. Document all results for future reference and maintenance planning.