電力電纜

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電力電纜-4x25+1x16
電纜故障從型式上可分為串聯與并聯故障,串聯故障指電纜一個或多個導體(包括鉛、鋁外皮)斷開,通常在電纜至少一個導體斷路之前,串聯故障是不容易發現的
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  電纜故障從型式上可分為串聯與并聯故障。串聯故障指電纜一個或多個導體(包括鉛、鋁外皮)斷開;通常在電纜至少一個導體斷路之前,串聯故障是不容易發現的。并聯故障是導體對外皮或導體之間的絕緣下降,不能承受正常運行電壓。實際的故障型式組合是很多的,圖1給出了可能性較大的幾種故障形式。


甘肅高壓電力電纜價格

  例如:導體斷路往往是電纜故障電流過大而燒斷的,這種故障一般伴有并聯接地或相間絕緣下降的情況。實際發生的故障絕大部分是單相對地絕緣下降故障。
  電纜故障點可用電路來等效。Rf代表絕緣電阻,G是擊穿電壓為Vg的擊穿間隙,Cf代表局部分布電容,上述三個數值隨不同的故障情況變化很大,并且互相之間并沒有必然的聯系。

  間隙擊穿電壓Vg的大小取決于放電通道的距離,電阻Rf的大小取決于電纜介質的碳化程度,而電容Cf的大小取決于故障點受潮的程度,數值很小,一般可以忽略。
  根據故障電阻與擊穿間隙情況,電纜故障可分為開路、低阻、高阻與閃絡性故障。說明:表中Z0為電纜的波阻抗值,電力電纜波阻抗一般在10-40Ω之間。

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