描述
電流互感器燒毀原因有很多種,下面我們分析一下電流互感器常燒毀的原因:
一是電流互感器使用年限過(guò)長(zhǎng)絕緣老化,局部發(fā)生擊穿或放電,產(chǎn)生過(guò)電壓,使電流互感器發(fā)熱燒壞。
二是用戶(hù)超負(fù)荷運(yùn)行時(shí)間長(zhǎng),使電流互感器發(fā)熱燒壞。
三是電流互感器二次開(kāi)路,產(chǎn)生高電壓,使電流互感器燒壞。
四是電流互感器一次連接鋁排接觸面氧化過(guò)重,接觸電阻過(guò)大,發(fā)熱使電流互感器燒壞。
五是專(zhuān)用變壓器用戶(hù)斷路器及接線存在問(wèn)題:
①一般10kV真空斷路器和SF6斷路器都具備有過(guò)流和過(guò)負(fù)荷保護(hù),出現(xiàn)相間短路及過(guò)負(fù)荷時(shí)斷路器能正確跳閘,過(guò)電壓則靠裝設(shè)的氧化鋅避雷器切除。我公司所管轄專(zhuān)用變用戶(hù)高壓計(jì)量用電流互感器都裝設(shè)在隔離開(kāi)關(guān)和斷路器之間,這樣一旦電流互感器出現(xiàn)問(wèn)題,斷路器和避雷器均不能切除故障,將由上一級(jí)斷路器跳閘切除故障,從而擴(kuò)大停電范圍,同時(shí)也會(huì)因延時(shí)切除故障使電流互感器燒毀。
②用戶(hù)側(cè)發(fā)生單相接地時(shí),因斷路器不跳閘,為尋找接地點(diǎn)需逐一拉合同一公用線上的下線分支,還會(huì)造成停用公用線,增大停電范圍。
③用戶(hù)側(cè)避雷器絕緣老化,不能有效防止過(guò)電壓。
預(yù)防電流互感器燒毀采取的對(duì)策:
(1)加強(qiáng)用戶(hù)高壓計(jì)量電流互感器及避雷器高壓絕緣試驗(yàn),及早發(fā)現(xiàn)計(jì)量電流互感器和避雷器絕緣老化程度,及時(shí)更換,避免出現(xiàn)計(jì)量電流互感器燒壞造成停電。
(2)裝設(shè)看門(mén)狗斷路器,避免分支故障波及整條饋線停電,尤其是能保證用電側(cè)單相接地時(shí)分支斷路器能可靠跳閘。
(3)將計(jì)量用電流互感器接至斷路器后面,以確保計(jì)量電流互感器故障時(shí)斷路器和避雷器正確動(dòng)作切除故障。
(4)定期清掃用戶(hù)一次設(shè)備,減少污閃,避免絕緣降低。
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