Question: 1 . A star - connected, 3 - phase, 1 0 MVA, 6 6 kV alternator is protected by Merz Price circulating - current principle

1. A star-connected, 3-phase, 10 MVA, 66 kV alternator is protected by Merz Price circulating-current principle using 1000/5 amperes current transformers. The star point of the alternator is earthed through a resistance of 75. If the minimum operating current for the relay is 05 A. Calculate the percentage of each phase of the stator winding which is unprotected against earth-faults when the machine is operating at normal voltage.

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