Allen Bradley 2706-E43J128B1變壓器油受潮后絕緣強(qiáng)度降低，油面下降或絕緣老化;雷電大氣電壓及操作過電壓，繞組受短路電流的沖擊發(fā)生變形，主絕緣老化破裂、折斷等缺陷;繞組內(nèi)有雜物落入等都會發(fā)生這類事故，事故時，一般都是瓦斯繼電器動作，防爆管噴油，如果變壓器的中心點(diǎn)接地，則差動和直流保護(hù)也會動作。一般情況下，測量繞組的對地絕緣電阻即可發(fā)現(xiàn)是否存在繞組接地。

繞組和引線斷線

由于連接不良或短路應(yīng)力使導(dǎo)線斷裂;導(dǎo)線內(nèi)部焊接不良，匝間短路使線匝燒斷，斷線處發(fā)生電弧會引起繞組接地和相間短路，油分解促使氣體繼電器動作。處理時可進(jìn)行吊芯檢查，用電橋測量繞組直流電阻，判斷故障相，重繞繞組。

Allen Bradley 2706-E43J128B1 

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