特高压变压器磁屏蔽接地线断裂引起局部放电异常的检测与分析
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摘要
针对特高压某站主变压器交接试验中出现的局部放电异常现象,排除了外部干扰、试验检测系统的影响,分析了变压器磁屏蔽及其接地的结构特点,对放电部位进行定位。首次发现了特高压主体变压器内存在的磁屏蔽接地线断裂重大缺陷,该缺陷导致磁屏蔽悬浮放电产生大量乙炔。更换磁屏蔽接地后变压器运行正常,成功消除了该缺陷。分析处理结果表明,综合运用局部放电试验方法、超声波定位方法和油中溶解气体色谱分析能够准确判断缺陷类型并进行精准定位。
Based on the detection and analysis of the abnormal phenomenon in UHV transformer partial discharge test, this paper eliminates the influence of external disturbance and the test system, analyzes the structure characteristics of transformer magnetic shielding and grounding, and carries out the discharge location. It first discovers the fracture of magnetic shielding ground line in UHV transformer, which causes the magnetic shielding floating potential discharge and thereby produce a large amount of acetylene gas. The defect is eliminated successfully, and then the transformer operates normally by replacing the magnetic shielding ground line. The analysis shows that the integrated use of partial discharge test, ultrasonic positioning method and oil chromatographic analysis can accurately diagnose defect types and position them.
Based on the detection and analysis of the abnormal phenomenon in UHV transformer partial discharge test, this paper eliminates the influence of external disturbance and the test system, analyzes the structure characteristics of transformer magnetic shielding and grounding, and carries out the discharge location. It first discovers the fracture of magnetic shielding ground line in UHV transformer, which causes the magnetic shielding floating potential discharge and thereby produce a large amount of acetylene gas. The defect is eliminated successfully, and then the transformer operates normally by replacing the magnetic shielding ground line. The analysis shows that the integrated use of partial discharge test, ultrasonic positioning method and oil chromatographic analysis can accurately diagnose defect types and position them.
引文
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[2]耿庆申,卢玉,樊海荣,等.特高压和超高压交流输电系统运行损耗比较分析[J].电力系统保护与控制,2016,44(16):72-77.GENG Qingshen,LU Yu,FAN Hairong,et al.Comparative analysis of operation losses of UHV AC and EHV AC transmission systems[J].Power System Protection and Control,2016,44(16):72-77.
[3]陈洪岗,祝达康,林一.交流特高压现场交接关键试验技术研究[J].华东电力,2014,42(12):2811-2814.CHEN Honggang,ZHU Dakang,LIN Yi.Key testing technology for AC UHV on-site handover[J].East China Electric Power,2014,42(12):2811-2814.
[4]李鹏,李金忠,崔博源,等.特高压交流输变电装备最新技术发展[J].高电压技术,2016,42(4):1068-1078.LI Peng,LI Jinzhong,CUI Boyuan,et al.Achievements in the newest technology of UHV AC power transmission equipment[J].High Voltage Engineering,2016,42(4):1068-1078.
[5]官澜,李光范,李博,等.我国特高压电力变压器研制技术及发展[J].变压器,2014,51(8):28-33.GUAN Lan,LI Guangfan,LI Bo,et al.Manufacture technology and development of UHV power transformer in China[J].Transformer,2014,51(8):28-33.
[6]杨敏祥,赵雪松,宋巍,等.一起500 k V主变低压侧磁屏蔽绝缘破损的分析与验证[J].华北电力技术,2015(5):7-12.YANG Minxiang,ZHAO Xuesong,SONG Wei,et al.The analysis and verification of insulation damage in the low voltage side magnetic shield of a 500 k V transformer[J].North China Electric Power,2015(5):7-12.
[7]徐铬.840 MVA主变压器磁屏蔽故障分析及处理[J].水电与新能源,2016(1):53-59.XU Ge.Analysis and treatment of a magnetic shielding fault in 840 MVA main transformer[J].Hydropower and New Energy,2016(1):53-59.
[8]李伟,王刘芳,余国钢.大型电力变压器磁屏蔽异常实例及分析[J].安徽电力,2005,22(2):1-5.LI Wei,WANG Liufang,YU Guogang.Example and analysis of magnetic shield fault of large power transformer[J].Anhui Electric Power,2005,22(2):1-5.
[9]杨小铭,王煜,饶丹,等.变压器状态监测组件功能整合研究和性能提升设计[J].电力系统保护与控制,2017,45(16):130-135.YANG Xiaoming,WANG Yu,RAO Dan,et al.Design and application of IED in integrated monitoring intelligent component of transformer[J].Power System Protection and Control,2017,45(16):130-135.
[10]1000 k V系统电气装置安装工程电气设备交接试验标准:GB/T 50832—2013[S].北京:中国计划出版社,2013.Standard for acceptance test of electric equipment of1000 k V system electric equipment installation engineering:GB/T 50832—2013[S].Beijing:China Planning Press,2013.
[11]1000 k V变压器局部放电现场测量技术导则:DL/T1275—2013[S].北京:中国电力出版社,2013.Guide for on-site partial discharge measurement for1000 k V power transformers:DL/T 1275—2013[S].Beijing:China Electric Power Press,2013.
[12]韩金华,夏中原,王伟,等.特高压变压器现场局部放电试验的变频电源方法应用[J].高压电器,2013,49(10):51-57.HAN Jinhua,XIA Zhongyuan,WANG Wei,et al.Application of variable frequency power supply method to in-site ACLD test of 1000 k V UHV transformer[J].High Voltage Apparatus,2013,49(10):51-57.
[13]邓万婷,鲁非,罗维,等.交流特高压主变调变联合局放试验方法[J].变压器,2016,53(5):48-51.DENG Wanting,LU Fei,LUO Wei,et al.United PD test method for UHV AC main and voltage regulating and compensating transformer[J].Transformer,2016,53(5):48-51.
[14]聂德鑫,伍志荣,罗先中,等.特高压变压器套管局部放电试验技术分析[J].高电压技术,2010,36(6):1448-1454.NIE Dexin,WU Zhirong,LUO Xianzhong,et al.Analysis on the partial discharge test technology of UHV transformer bushing[J].High Voltage Engineering,2010,36(6):1448-1454.
[15]李艳鹏,晋涛,张健.紫外成像技术在特高压变压器局部放电试验中的应用[J].高压电器,2013,49(11):123-126.LI Yanpeng,JIN Tao,ZHANG Jian.Application of ultraviolet imagery technology in partial discharge measurement test of UHV transformer[J].High Voltage Apparatus,2013,49(11):123-126.
[16]代金龙.油浸式变压器、电抗器油箱磁屏蔽的研究[D].北京:华北电力大学,2013.DAI Jinlong.The research on magnetic-shielded tank of oil-immersed transformers&reactors[D].Beijing:North China Electric Power University,2013.
[17]张福东,周明辉,王洪伟,等.浅析变压器的磁屏蔽结构[J].变压器,2011,48(9):17-20.ZHANG Fudong,ZHOU Minghui,WANG Hongwei,et al.Brief discussion on magnetic shielding structure of transformer[J].Transformer,2011,48(9):17-20.