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Which is the most important and common stator fault of a generator?

Which is the most important and common stator fault of a generator? Correct Answer Phase earth fault

Stator Winding Faults:

These faults occur mainly due to the insulation failure of the stator windings.

The main types of stator winding faults, in order of importance, are:

(a) fault between phase and ground (most common type)

(b) fault between phases

(c) inter-turn fault involving turns of the same phase winding

The stator winding faults are the most dangerous and are likely to cause considerable damage to the expensive machinery.

Therefore, automatic protection is absolutely necessary to clear such faults in the quickest possible time in order to minimize the extent of the damage.

For the protection of alternators against such faults, the differential method of protection (also known as the Merz-Price system) is most commonly employed due to its greater sensitivity and reliability.

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