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在處理故障貼片電解電容器時(shí),應(yīng)在斷開(kāi)貼片電解電容器的斷路器,拉開(kāi)斷路器兩則的隔離開(kāi)關(guān),并對(duì)貼片電解電容器組經(jīng)放電電阻放電后進(jìn)行。那么如何處理貼片電解電容故障問(wèn)題?以下幾點(diǎn):
1、對(duì)于雙星形接線的貼片電解電容器組的中性線上,以及多個(gè)貼片電解電容器的串接線上,還應(yīng)單獨(dú)進(jìn)行放電。貼片電解電容器在變電,濾波,耦合等各種設(shè)備中屬于可靠性比較薄弱的電器,它比同級(jí)電壓的其他設(shè)備的絕緣的電子元器件較為薄弱,內(nèi)部元件發(fā)熱較多,而散熱情況又欠佳,內(nèi)部故障的機(jī)會(huì)較多,制造電力貼片電解電容器內(nèi)部材料的可燃物成分又大,所以運(yùn)行中易著火。
2、貼片電解電容器組經(jīng)放電電阻(放電變壓器或放電電壓互感器)放電以后,由于部分殘存電荷一時(shí)放不盡,仍應(yīng)進(jìn)行一次人工放電。放電時(shí)先將接地線接地端接好,再用接地棒多次對(duì)貼片電解電容器放電,直至無(wú)放電火花及放電聲為止,然后將接地端固定好。
3、由于故障貼片電解電容器非??赡馨l(fā)生引線接觸不良、內(nèi)部斷線或熔絲熔斷等,因此有部分電荷可能未放盡,所以各種檢修人員在接觸故障貼片電解電容器之前,還應(yīng)戴上絕緣手套,先用短路線將故障貼片電解電容器兩極短接,然后方動(dòng)手拆卸和更換。