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      1. 高壓隔離開關(guān)故障分析

        2014/1/9 8:21:11      點(diǎn)擊:
        高壓隔離開關(guān) 在系統(tǒng)運(yùn)行中隔離開關(guān)發(fā)生的缺陷和故障比較多,涉及到多方面的質(zhì)量問(wèn)題。對(duì)安全運(yùn)行威脅最大的是瓷瓶斷裂故障,其次是觸頭過(guò)熱、運(yùn)動(dòng)卡滯、機(jī)構(gòu)卡澀和分合閘不到位、瓷瓶閃絡(luò)等。
        a.瓷瓶斷裂故障。2005年,徐州電網(wǎng)發(fā)生了2次瓷瓶斷裂故障,一次是在運(yùn)行操作中,一次是在施工接線過(guò)程中,斷裂處均在瓷瓶和法蘭的膠合處。瓷瓶斷裂既與產(chǎn)品質(zhì)量有關(guān),也與隔離開關(guān)的整體質(zhì)量及操作方法有關(guān)。瓷瓶在燒制過(guò)程中控制不當(dāng)可能造成瓷件夾生、致密性不均以及水泥膠裝不良的問(wèn)題,加之質(zhì)檢手段不嚴(yán),造成個(gè)別質(zhì)量低劣的瓷瓶被組裝成產(chǎn)品后,投放到運(yùn)行中對(duì)安全構(gòu)成極大威脅。操作人員在分合隔離開關(guān)時(shí)操作方法不當(dāng)、用力過(guò)猛也容易造成瓷瓶損壞。此外,2005年和2004年還發(fā)生了8節(jié)500kVSOPLT型刀閘支持瓷瓶開裂缺陷。
        b.導(dǎo)電回路過(guò)熱。運(yùn)行中常常發(fā)生導(dǎo)電回路異常發(fā)熱現(xiàn)象,多數(shù)是由于靜觸指壓緊彈簧疲勞、特性變壞,靜觸指單邊接觸以及長(zhǎng)期運(yùn)行接觸電阻增加而造成的。運(yùn)行中由于靜觸指壓緊彈簧長(zhǎng)期受壓縮,如果工作電流較大,溫升超過(guò)允許值,就會(huì)使其彈性變差,惡性循環(huán),最終造成燒損,這是造成觸頭發(fā)熱的主要原因。此外,觸頭鍍銀層工藝差、易磨損露銅,接觸面臟污,觸頭插入不夠、螺栓銹蝕造成線夾接觸面壓力降低等也是造成發(fā)熱的原因。
        c.機(jī)構(gòu)問(wèn)題。機(jī)構(gòu)問(wèn)題表現(xiàn)為操作失靈,如拒動(dòng)或分合閘不到位,往往發(fā)生在倒閘操作時(shí),影響系統(tǒng)的安全運(yùn)行。由于機(jī)構(gòu)箱密封不好或銹蝕進(jìn)水造成機(jī)構(gòu)銹蝕嚴(yán)重,潤(rùn)滑干涸,操作阻力增大,在操作困難的同時(shí),還會(huì)發(fā)生零部件損壞,如變速齒輪斷裂,連桿扭彎等。
        d.傳動(dòng)困難。隔離開關(guān)的傳動(dòng)系統(tǒng)銹蝕造成傳動(dòng)阻力大,甚至出現(xiàn)拒分拒合,如在運(yùn)行中曾出現(xiàn)底座軸承銹死、無(wú)法操作的情況,這是由于傳動(dòng)部件的主軸銅套干澀、軸承臟污、黃油干涸造成的。
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