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从直流电缆的阻燃性能来看,可以使用不同电阻指数的原料形成分级阻燃剂,进而提高原料用量和外电阻指数。对于电缆的阻燃性,特别是在表面有污垢或水分的情况下,由于分布不均匀,一些外层可能会引起比较高的电压,然后少量的放电或沿面放电会造成严重的故障。
氢氧化铝在使用过程中,如果阻燃值太小,沿线泄漏电流肯定会增加,造成电能的浪费,同时电能会变成热能,增加热击穿的概率。有时需要人为降低氢氧化铝外层例如电缆导电芯的阻力,因为外部电场分布不均匀且不完全平滑,电场强度可能过高,可能发生电晕放电。铁芯外层包覆导电橡胶或半导电塑料,可以降低电场强度和电晕。
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