Suzhou Electric Appliance Research Institute
期刊號: CN32-1800/TM| ISSN1007-3175

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一起500 kV變壓器中性點套管介損超標原因分析及處理

來源:電工電氣發(fā)布時間:2019-11-19 13:19 瀏覽次數(shù):641
一起500 kV變壓器中性點套管介損超標原因分析及處理
 
謝斯晗,張翾喆,李文燕,艾云飛,劉昌標
(國網(wǎng)浙江省電力有限公司檢修分公司,浙江 杭州 311232)
 
    摘 要:在某500 kV變電站進行例行停電試驗時發(fā)現(xiàn)主變中性點套管介損超標,現(xiàn)場綜合絕緣油色譜、微水、絕緣電阻試驗初步確認了導致介損增大的原因。套管返廠試驗時發(fā)現(xiàn)介損較現(xiàn)場測試結(jié)果有進一步的增大,通過密封性試驗、絕緣油色譜、微水試驗,結(jié)合套管的解體檢查,確定套管介損超標的原因是套管油枕放氣孔螺栓未旋緊導致受潮,返廠后介損進一步增大的原因是運輸過程中套管底部水分擴散至整個電容屏,對如何預防類似情況發(fā)生給出了若干建議。
    關(guān)鍵詞:中性點套管;介損;電容量;微水試驗;受潮
    中圖分類號:TM406     文獻標識碼:B     文章編號:1007-3175(2019)11-0042-03
 
Analysis and Processing of Excessive Dielectric Loss Value in 500 kV Transformer Neutrality Point Bushing
 
XIE Si-han, ZHANG Xuan-zhe, LI Wen-yan, AI Yun-fei, LIU Chang-biao
(Maintenance Branch of State Grid Zhejiang Electric Power Company Ltd, Hangzhou 311 232, China)
 
    Abstract: It found that the dielectric loss value of transformer neutrality point bushing is out of limits when the routine power test conducted in a 500 kV transformer substation, the integrate oil chromatography, the micro water test and the insulation resistance test were preliminarily verified to be the reason of increscent abnormal dielectric loss value in working site. The dielectric loss value increased further than the result of test in working site when the transformer neutrality point bushing was backed to the manufacturers. The encapsulation test, the oil chromatographic test, the micro water test and the strip inspection of bushing verified that the reasons of trouble were the damp caused by the loose air-bleed hole bolt of the oil breather and the water at the bottom of bushing diffusing into capacitive screen in the process of transportation. This paper has offered some suggestion to avoid the similar situation.
    Key words: neutrality point bushing; dielectric loss value; capacitance; micro water test; damp
 
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