MGVCL Exam Paper (30-07-2021 Shift 1)
The normal percentage bias setting of differential relay used for transformer protection will be

above 75%
below 10%
between 50% and 75%
between 10% and 50%

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MGVCL Exam Paper (30-07-2021 Shift 1)
Insulation Power Factor testing on an oil-filled transformer is not helpful in determining ___

Turns ratio values
Condition of paper insulation (change in watts losses)
Movement of the windings (change in capacitance)
Whether the oil test indicates moisture

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