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10
System Protection
The power system design includes protection from all credible fault currents
and overvoltages that may occur in normal and abnormal operations. The fault
(short circuit) occurs by accident or when the insulation breaks down due to aging
and vibrations, or due to overvoltages exceeding the strength of the insulation.
Giving special emphasis on the ship environment (humidity, high temperature,
and vibrations) is important in selecting the insulation type for shipboard electri-
cal equipments.
The heat generation rate and the mechanical force in conductors, being the
square function of the current, are the ...