cted alternator is protected by Merz-Price circulating current system. The star point is earthed through a resistance of 5 ohms. If the CTs have a ratio of 1000/5 and the relay is set to operate when there is an out of balance
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. A 3-phase, 20 MVA, 11kV star connected alternator is protected by Merz-Price circulating current
system. The star point is earthed through a resistance of 5 ohms. If the CTs have a ratio of 1000/5
and the relay is set to operate when there is an out of balance current of 1·5 A, calculate :
(ii) the minimum value of earthing resistance to protect 90% of the winding
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