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英语翻译When the arc is established through solid insulation,per

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英语翻译
When the arc is established through solid insulation,permanent damage will be done to the insulation,and the equipment must not only be de-energized,but also repaired before it can be return to service.Solid insulation exists in power apparatus.The insulation may be paper in a cable,solid insulation in transformer windings,porcelain in transformer bushings.Compressed air and compressed gases may be found in power-circuit breakers.Oil may also be used in circuit breakers and in cables.Sometimes,inflammable liquids are used in equipment that may be installed in hazardous location.就是这段
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