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In case an alternator is running at no load and there is a 3 phase fault at its output (armature) terminals. What protection comes into play to protect alternator from supplying the fault?

According to this equation (N*A*B)US < (N*A*B)India If B and N are same then AUS < AIndia therefor U.S. devices are smaller

What is the difference in the design of transformer and motor (core and windings) in US (230V,60Hz) and India (415V, 50Hz)?

How are losses and core size and lamination thickness different in the two cases for transformers? At some places I have read that core losses increase in case of 60Hz. But I think it should decrease in case of 60Hz.

What is the difference in the design of transformer and motor (core and windings) in US (220V,60Hz) and India (415V, 50Hz)?

Thanks

@ScottyUK...Is BDV (breakdown voltage) of oil same for both the cases?

What is the difference in properties of transformer oil used for different voltage levels? For instance, oil used for 11kV and 400kV level.