•Faults due to overload will occur due to exceeding the maximum permissible load current through the windings, cables, or transmission lines or due to reduction in the cooling offered to the windings.
•Electrical conductor is designed in such a manner that the conductor allows permissible amount of current without getting over heated. In this manner the current carrying rating of the conductor is decided. When the current passed through the conductor is above permissible level, no immediate damage occurs but over a period of time conductor insulation will be damaged due to the excess heat generated.
In large generators and power transformers of large MW ratings, the heat generated is enormous, so that forced cooling is provided in such cases. For large generators, hydrogen cooling is provided and for large transformers forced cooling is provided. When these cooling methods fail, then the damage to the equipment is certainly fast compared to the other case.
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