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      1. 高壓隔離開關(guān)故障防治

        2014/1/9 8:22:09      點擊:
        高壓隔離開關(guān) 造成上述隔離開關(guān)缺陷或故障的原因,既有制造工藝、選材質(zhì)量問題,也有些是由于檢修維護不當所致。要保證隔離開關(guān)的安全運行,保證其初始質(zhì)量是關(guān)鍵所在。
        加強選型

        要廣泛收集系統(tǒng)中運行的隔離開關(guān)運行情況,選用結(jié)構(gòu)合理、設(shè)計優(yōu)良、整體質(zhì)量高的產(chǎn)品。
        技術(shù)改造

        a.對瓷瓶斷裂問題必須進行綜合治理,首先要保證隔離開關(guān)的整體結(jié)構(gòu)合理,其次還要加強對瓷瓶制造企業(yè)的選擇,可以指定隔離開關(guān)生產(chǎn)企業(yè)使用質(zhì)量優(yōu)、信譽好的瓷瓶制造企業(yè)的產(chǎn)品。另外,可以開展無損探傷技術(shù),定期對瓷瓶進行檢測。運行人員要加強監(jiān)視,特別是對瓷瓶膠合面的觀察。在運行操作時要方法得當,如出現(xiàn)操作困難時切忌強行操作。
        b.隔離開關(guān)導(dǎo)電回路發(fā)熱和瓷瓶閃絡(luò)現(xiàn)象,嚴重影響著設(shè)備的安全運行?梢愿鼡Q靜觸指壓緊彈簧為不銹鋼彈簧,采用不銹鋼螺栓或熱鍍鋅高強度螺栓并用力矩扳手緊固;調(diào)整觸頭插入深度和清潔接觸面,或采用類似西門子公司的自清潔觸頭。同時采用紅外測溫技術(shù)定期檢測導(dǎo)電部位的發(fā)熱情況,發(fā)現(xiàn)問題及時處理。
        瓷瓶閃絡(luò)主要是瓷瓶表面和瓷裙內(nèi)積污嚴重、瓷裙爬距小造成的。特別是在重污染區(qū)內(nèi)的刀閘,化工污染和水泥積垢不僅使得瓷瓶清掃極為困難,而且空氣中大量的工業(yè)粉塵和腐蝕性氣體的存在極易引起瓷瓶閃絡(luò)放電,擴大事故范圍。2001年,地處徐州北郊化工區(qū)的彭場變110kV刀閘發(fā)生支持瓷瓶大面積閃絡(luò)放電,導(dǎo)致瓷瓶爆裂。針對這種情況,可以采取帶電清掃加強清掃力度、給隔離開關(guān)瓷瓶增加硅橡膠傘裙以增大爬距和利用RTV涂料的憎水性噴涂RTV。
        c.銹蝕是影響隔離開關(guān)安全可靠運行的首要問題,定期進行防銹處理,對各傳動部位加潤滑劑,特別是使用性能優(yōu)于黃油的二硫化鉬潤滑劑。黃銅軸套更換為鋼基表面燒結(jié)青銅加改型聚四氟乙烯復(fù)合軸套,外表面及端部鍍錫以防止銹蝕。機構(gòu)箱采用質(zhì)量優(yōu)良的不銹鋼產(chǎn)品,對隔離開關(guān)底座進行改造,在底座上鉆孔,運行中定期加二硫化鉬,確保軸承不生銹。
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