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      1. 避雷器運行維護

        2014/1/14 8:39:19      點擊:
        避雷器 日常運行中,應(yīng)檢查避雷器的瓷套表面的污染狀況,因為當瓷套表面受到嚴重污染時,將使電壓分布很不均勻。在有并聯(lián)分路電阻的避雷器中,當其中一個元件的電壓分布增大時,通過其并聯(lián)電阻中的電流將顯著增大,則可能燒壞并聯(lián)電阻而引起故障。此外,也可能影響閥型避雷器的滅弧性能。因此,當避雷器瓷套表面嚴重污穢時,必須及時清掃。
        檢查避雷器的引線及接地引下線,有燒傷痕跡和斷股現(xiàn)象以及放電記錄器是否燒通過這方面的檢查,最容易發(fā)現(xiàn)避雷器的隱形缺陷;檢查避雷器上端引線處密封是否良好,避雷器密封不良會進水受潮易引起事故,因而應(yīng)檢查瓷套與法蘭連接處的水泥接合縫是否嚴密,對10千伏閥型避雷器上引線處可加裝防水罩,以免雨水滲入;檢查避雷器與被保護電氣設(shè)備之間的電氣距離是否符合要求,避雷器應(yīng)盡量靠近被保護的電氣設(shè)備,避雷器在雷雨后應(yīng)檢查記錄器的動作情況;檢查泄漏電流,工頻放電電壓大于或小于標準值時,應(yīng)進行檢修和試驗;放電記錄器動作次數(shù)過多時,應(yīng)進行檢修;瓷套及水泥接合處有裂紋;法蘭盤和橡皮墊有脫落時,應(yīng)進行檢修。
        避雷器的絕緣電阻應(yīng)定期進行檢查。測量時應(yīng)用2500伏絕緣搖表,側(cè)得的數(shù)值與以前一次的結(jié)果比較,無明顯變化時可繼續(xù)投入運行。絕緣電阻顯著下降時,一般是由密封不良而受潮或火花間隙短路所引起的,當?shù)陀诤细裰禃r,應(yīng)作特性試驗;絕緣電阻顯著升高時,一般是由于內(nèi)部并聯(lián)電阻接觸不良或斷裂以及彈簧松弛和內(nèi)部元件分離等造成的。
        為了能及時發(fā)現(xiàn)閥型避雷器內(nèi)部隱形缺陷,應(yīng)在每年雷雨季節(jié)之前進行一次預防性試驗。
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