The main reason for the short circuit is:
(1) the insulation selection is not appropriate, such as voltage grade is high, the insulation level is low;
(2) subjected to high temperature, humidity, corrosion loss of insulating ability;
(3) tied with a wire conductor or hang insulation on the metal;
(4) long-term insulation wear or mechanical damage, aging;
(5) in oil equipment oil aging metamorphism or water, impurities, etc.;
(6) lightning overvoltage, line when no-load voltage rise and so on, also can make wire insulating weak insulation was a strike and short-circuit.
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