Suzhou Electric Appliance Research Institute
期刊號(hào): 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(cè)分析與消除

來源:電工電氣發(fā)布時(shí)間:2021-11-19 08:19 瀏覽次數(shù):485

環(huán)氧樹脂絕緣站用變壓器局部異常發(fā)熱檢測(cè)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(wǎng)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(xué) 電氣與電子工程學(xué)院,山東 淄博 255000)
 
    摘 要:由于站用變壓器長期運(yùn)行在高電壓、高場強(qiáng)和負(fù)載電流條件下,所處環(huán)境工況復(fù)雜,其絕緣性能失效事件時(shí)有發(fā)生。通過紅外熱像儀測(cè)溫、長焦相機(jī)拍照的帶電檢測(cè)方法,結(jié)合離線電氣試驗(yàn),分析了一起 35 kV 干式絕緣站用變壓器因局部機(jī)械受損、運(yùn)行環(huán)境濕度大,從而導(dǎo)致其繞組環(huán)氧樹脂絕緣性能下降并發(fā)生沿面放電,進(jìn)而引起局部異常發(fā)熱的案例,并介紹了修復(fù)方案和預(yù)防措施,為保障站用變壓器的安全穩(wěn)定運(yùn)行和維修試驗(yàn)提供了參考。
    關(guān)鍵詞:站用變壓器;帶電檢測(cè);絕緣性能;沿面放電;異常發(fā)熱
    中圖分類號(hào):TM401     文獻(xiàn)標(biāo)識(shí)碼:B    文章編號(hào):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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