Which device is connected for protection against phase to earth insulation failure?

Q.  Which among the following device is connected to provide protection against phase to earth insulation failure?
- Published on 28 Sep 15

a. Earth fault relay connected in neutral to earth circuit.
b. Earth fault relay connected in three phase residual secondary circuit of C T secondaries
c. Differential protection
d. All of these
e. None of these

ANSWER: All of these

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