Insulation Power Factor testing on an oil-filled transformer is not helpful in determining ___

• A. Condition of paper insulation (change in watts losses)
• B. Turns ratio values
• C. Whether the oil test indicates moisture
• D. Movement of the windings (change in capacitance)

Answer: (B)

A form of AC testing that applies voltage and measures the leakage/loss current of electrical insulation.
It is a type of insulation testing used to evaluate the integrity of electrical insulation.