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

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環(huán)氧樹脂絕緣站用變壓器局部異常發(fā)熱檢測分析與消除

來源:電工電氣發(fā)布時間:2021-11-19 08:19 瀏覽次數:547

環(huán)氧樹脂絕緣站用變壓器局部異常發(fā)熱檢測分析與消除

劉泊辰1, 郝洪民1, 苗軍1, 咸日常2, 陳蕾2, 郭洋2, 李佳琪2
(1 國網山東省電力公司淄博供電公司,山東 淄博 255000;
2 山東理工大學 電氣與電子工程學院,山東 淄博 255000)
 
    摘 要:由于站用變壓器長期運行在高電壓、高場強和負載電流條件下,所處環(huán)境工況復雜,其絕緣性能失效事件時有發(fā)生。通過紅外熱像儀測溫、長焦相機拍照的帶電檢測方法,結合離線電氣試驗,分析了一起 35 kV 干式絕緣站用變壓器因局部機械受損、運行環(huán)境濕度大,從而導致其繞組環(huán)氧樹脂絕緣性能下降并發(fā)生沿面放電,進而引起局部異常發(fā)熱的案例,并介紹了修復方案和預防措施,為保障站用變壓器的安全穩(wěn)定運行和維修試驗提供了參考。
    關鍵詞:站用變壓器;帶電檢測;絕緣性能;沿面放電;異常發(fā)熱
    中圖分類號:TM401     文獻標識碼:B    文章編號:1007-3175(2021)11-0047-04
 
Detection Analysis and Elimination of Local Abnormal Heating of Epoxy
Resin Insulated Station Transformer
 
LIU Bo-chen1, HAO Hong-min1, MIAO Jun1, XIAN Ri-chang2, CHEN Lei2, GUO Yang2, LI Jia-qi2
(1 State Grid Shandong Electric Power Company Zibo Power Supply Company, Zibo 255000, China;
2 School of Electrical and Electronic Engineering, Shandong University of Technology, Zibo 255000, China)
 
    Abstract: The insulation failure event of station transformers is a frequent occurrence due to the long-term operation of the transformers for power stations under high voltage and high electric stress, overload current, and complex working conditions. This paper analyzed a typical case a 35 kV dry-type insulation substation transformer has a local heating phenomenon. The phenomenon is caused by the insulation of epoxy resin winding decreasing and creeping discharge, which was triggered by the mechanical fault and high environmental relative humidity.This article introduces the repair plan and preventive measures, which could provide a reference for ensuring the safe and stable operation and maintenance test of the transformers for power stations.
    Key words: station transformer; live detection; insulation performance; creeping discharge; abnormal heating
 
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