鋼Bently Nevada 2789-084墊腳與鐵心之間的絕緣破損或進(jìn)水受潮如圖3所示,送種情況與4.1是類(lèi)似化除此么外,懸浮金屬物的影響也是個(gè)造成鐵也多點(diǎn)接地的原面5鐵心多點(diǎn)接地故障處理由懸浮物導(dǎo)致的多點(diǎn)接地,可采用電容放電沖擊法處理,或采用濾油口加除塵過(guò)濾網(wǎng)進(jìn)行熱油循環(huán)由較大的金屬異物導(dǎo)致鐵也的多點(diǎn)接地,應(yīng)進(jìn)行吊芯檢查,清除異物,否則必須解體;若由于結(jié)構(gòu)失穩(wěn)或者相關(guān)絕緣件破損導(dǎo)致多點(diǎn)接地,則必須更換相應(yīng)零部件;對(duì)由絕緣件受潮導(dǎo)致的鐵屯、多點(diǎn)接地,則必須進(jìn)行器身干燥處理,若現(xiàn)場(chǎng)條件不許可,Bently Nevada 2789-084則必須采用熱油循環(huán)法、感應(yīng)加熱法、熱風(fēng)干燥法、短路干燥法、零序電流法等處理6防范措施首先變壓器設(shè)計(jì)要合理,嚴(yán)防有些部件在制造和運(yùn)輸過(guò)程中失穩(wěn),與鐵也接觸;在吊芯安裝和大修過(guò)程中,要對(duì)油箱底部進(jìn)行徹底沖洗和清理消除殘余導(dǎo)電息浮物及金屬粉末對(duì)所使用的工具要專(zhuān)人看管發(fā)放、記錄,避免將工具遺留在殼體內(nèi);生產(chǎn)廠家在生產(chǎn)時(shí)要注意防塵,確保整個(gè)器身在裝配過(guò)程中的清潔度,有條件的廠家定要在防塵棚操作;定期進(jìn)行色譜分析,特別是對(duì)發(fā)生過(guò)多點(diǎn)接地故障的變壓器要增加色譜跟蹤密度,詳細(xì)記錄,周密分析。
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