故障電纜合閘送電有(you)哪些(xie)危害
中低壓供電(dian)(dian)(dian)電(dian)(dian)(dian)力電(dian)(dian)(dian)纜線(xian)路(lu)(lu)出(chu)現故(gu)障(zhang)后，做(zuo)為(wei)供電(dian)(dian)(dian)部門，不能輕(qing)易進(jin)(jin)行(xing)重(zhong)合閘(zha)操(cao)作送電(dian)(dian)(dian)。首先要對供電(dian)(dian)(dian)電(dian)(dian)(dian)纜線(xian)路(lu)(lu)進(jin)(jin)行(xing)故(gu)障(zhang)原因查找，在故(gu)障(zhang)性(xing)質檢查確認后，采(cai)取相應的(de)措施進(jin)(jin)行(xing)處理。故(gu)障(zhang)排除后，再進(jin)(jin)行(xing)合閘(zha)送電(dian)(dian)(dian)。不能盲(mang)目進(jin)(jin)行(xing)合閘(zha)操(cao)作，否則會(hui)造(zao)成(cheng)事故(gu)危害財產和人員(yuan)的(de)傷害，故(gu)障(zhang)電(dian)(dian)(dian)纜合閘(zha)送電(dian)(dian)(dian)會(hui)有(you)哪些危害呢(ni)？小編為(wei)您總結以下幾點：
1、 對(dui)于(yu)供電(dian)的(de)中(zhong)壓交聯(lian)電(dian)力電(dian)纜，可能會造成電(dian)纜發生多點絕(jue)緣(yuan)擊(ji)穿現象。由(you)于(yu)中(zhong)壓
交聯(lian)電(dian)(dian)(dian)纜(lan)(lan)(lan)發(fa)生(sheng)故障后，可能(neng)(neng)會(hui)出現(xian)(xian)單相(xiang)或(huo)多相(xiang)接地或(huo)相(xiang)間短(duan)路(lu)現(xian)(xian)象，在對電(dian)(dian)(dian)纜(lan)(lan)(lan)實際(ji)故障不明(ming)的情況(kuang)下，就盲(mang)目對電(dian)(dian)(dian)纜(lan)(lan)(lan)線路(lu)進行重合閘(zha)送電(dian)(dian)(dian)，一個是(shi)開關容易出現(xian)(xian)弧光短(duan)路(lu)現(xian)(xian)象，燒毀開關。再一個就是(shi)電(dian)(dian)(dian)纜(lan)(lan)(lan)線路(lu)容易出現(xian)(xian)過電(dian)(dian)(dian)壓和過電(dian)(dian)(dian)流，導致(zhi)(zhi)已出現(xian)(xian)故障的電(dian)(dian)(dian)纜(lan)(lan)(lan)出現(xian)(xian)多點擊穿(chuan)現(xian)(xian)象，甚至導致(zhi)(zhi)整根電(dian)(dian)(dian)纜(lan)(lan)(lan)的報廢。也(ye)可能(neng)(neng)會(hui)導致(zhi)(zhi)同一高壓配電(dian)(dian)(dian)室(shi)內其(qi)他中壓交聯(lian)電(dian)(dian)(dian)力電(dian)(dian)(dian)纜(lan)(lan)(lan)的一相(xiang)或(huo)幾相(xiang)絕(jue)緣擊穿(chuan)，造成(cheng)電(dian)(dian)(dian)纜(lan)(lan)(lan)故障范圍的擴大(da)。
2、 對于已出現(xian)故障的中壓單(dan)芯交聯(lian)電(dian)(dian)力電(dian)(dian)纜(lan)線路，重合閘送電(dian)(dian)后，產生(sheng)的過(guo)電(dian)(dian)壓和大(da)
的(de)(de)(de)瞬(shun)間(jian)短路(lu)電(dian)(dian)流(liu)，可(ke)能會造(zao)成電(dian)(dian)纜(lan)(lan)的(de)(de)(de)金屬(shu)屏蔽(bi)層，多(duo)處燒斷。因為(wei)現在供電(dian)(dian)使用的(de)(de)(de)單芯(xin)交聯電(dian)(dian)力電(dian)(dian)纜(lan)(lan)，大都(dou)采用金屬(shu)銅(tong)帶屏蔽(bi)的(de)(de)(de)方(fang)式，當電(dian)(dian)纜(lan)(lan)出現故障后，重合(he)閘送電(dian)(dian)操作產生(sheng)的(de)(de)(de)瞬(shun)間(jian)沖(chong)擊(ji)短路(lu)電(dian)(dian)流(liu)，流(liu)過銅(tong)帶可(ke)能會將銅(tong)帶多(duo)處燒斷。通過多(duo)次電(dian)(dian)纜(lan)(lan)故障現場服務(wu)，我(wo)們(men)發現35KV單芯(xin)非鎧裝長距離交聯電(dian)(dian)力電(dian)(dian)纜(lan)(lan)，在電(dian)(dian)纜(lan)(lan)出現故障后，在未(wei)查明故障原(yuan)因的(de)(de)(de)情況，對故障電(dian)(dian)纜(lan)(lan)進行多(duo)次誤合(he)閘強行送電(dian)(dian)，造(zao)成電(dian)(dian)纜(lan)(lan)金屬(shu)屏蔽(bi)銅(tong)帶燒斷的(de)(de)(de)現象較(jiao)多(duo)。
3、 對于低壓電力電纜，在出現短路故障后，強(qiang)行(xing)進行(xing)多次重合(he)閘，可(ke)能會(hui)造成開(kai)關的
燒毀，同時(shi)可能(neng)會使(shi)線(xian)路(lu)出(chu)現(xian)(xian)(xian)長(chang)距(ju)離(li)(li)大面積燒毀現(xian)(xian)(xian)象，尤(you)其是采用直(zhi)埋方(fang)式(shi)敷設的(de)(de)(de)(de)(de)低(di)壓鋼帶鎧(kai)裝(zhuang)電(dian)力(li)電(dian)纜(lan)(lan)，變現(xian)(xian)(xian)尤(you)為突出(chu)。通過(guo)多次對客戶現(xian)(xian)(xian)場低(di)壓直(zhi)埋電(dian)纜(lan)(lan)線(xian)路(lu)故(gu)障位置進(jin)行(xing)開(kai)(kai)挖后，我們(men)發現(xian)(xian)(xian)有(you)(you)一(yi)些低(di)壓電(dian)力(li)電(dian)纜(lan)(lan)的(de)(de)(de)(de)(de)故(gu)障位置不(bu)是一(yi)個點，而是在長(chang)度為幾(ji)十(shi)米(mi)的(de)(de)(de)(de)(de)區(qu)域內，電(dian)纜(lan)(lan)的(de)(de)(de)(de)(de)絕緣(yuan)(yuan)護套鎧(kai)裝(zhuang)全部燒熔(rong)粘接，碳化。造成電(dian)纜(lan)(lan)產生長(chang)距(ju)離(li)(li)燒毀的(de)(de)(de)(de)(de)原因(yin)可能(neng)很多，但對故(gu)障電(dian)纜(lan)(lan)進(jin)行(xing)重(zhong)合(he)閘(zha)送(song)(song)電(dian)造成的(de)(de)(de)(de)(de)短路(lu)電(dian)流沖擊也(ye)不(bu)能(neng)忽(hu)視。同時(shi)，低(di)壓電(dian)纜(lan)(lan)故(gu)障線(xian)路(lu)，二(er)次重(zhong)合(he)閘(zha)送(song)(song)電(dian)過(guo)程，情況也(ye)比較復雜，有(you)(you)時(shi)二(er)次可能(neng)一(yi)合(he)，開(kai)(kai)關就跳，有(you)(you)時(shi)開(kai)(kai)關二(er)次重(zhong)合(he)閘(zha)后，可能(neng)還能(neng)維(wei)持(chi)幾(ji)分(fen)(fen)鐘(zhong)或幾(ji)十(shi)分(fen)(fen)鐘(zhong)甚至幾(ji)天的(de)(de)(de)(de)(de)時(shi)間供電(dian)，隨著故(gu)障點絕緣(yuan)(yuan)破壞的(de)(de)(de)(de)(de)嚴重(zhong)程度及(ji)敷設方(fang)式(shi)和環(huan)境濕度的(de)(de)(de)(de)(de)不(bu)同，二(er)次重(zhong)合(he)閘(zha)送(song)(song)電(dian)維(wei)持(chi)的(de)(de)(de)(de)(de)時(shi)間長(chang)短也(ye)有(you)(you)區(qu)別。
