Analysis of Secondary Winding Voltage Loss Fault of 500kV CVT

DAI Yingjun

doi:10.14044/j.1674-1757.pcrpc.2025.05.010

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Analysis of Secondary Winding Voltage Loss Fault of 500kV CVT

Instrument Transformer | 更新时间：2025-10-30

- Analysis of Secondary Winding Voltage Loss Fault of 500kV CVT
- Power Capacitor & Reactive Power Compensation Vol. 46, Issue 5, Pages: 91-97(2025)
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- DOI：10.14044/j.1674-1757.pcrpc.2025.05.010
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- Received：08 June 2025，
  
  Published：25 October 2025
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DAI Yingjun. Analysis of Secondary Winding Voltage Loss Fault of 500kV CVT[J]. Power Capacitor & Reactive Power Compensation, 2025, 46(5): 91-97.
DOI：

DAI Yingjun. Analysis of Secondary Winding Voltage Loss Fault of 500kV CVT[J]. Power Capacitor & Reactive Power Compensation, 2025, 46(5): 91-97. DOI： 10.14044/j.1674-1757.pcrpc.2025.05.010.

摘要

某500kV变电站主变500kV侧电容式电压互感器（CVT）在运行过程中突然发生二次绕组失压故障，随后临时停电对故障CVT进行整体更换。为了分析CVT二次绕组失压故障原因，对故障CVT开展了绝缘电阻、直流电阻、变比、绝缘油、介损及电容量等一系列诊断性试验；结合故障时设备现场检查情况、诊断性试验数据、常见二次绕组失压原因逐一分析得出故障原因为CVT电磁单元中间变压器断线。为了定位CVT中间变压器断线位置，在变电站现场对故障CVT进行解体，对分离后的电磁单元及电容单元检查及试验，最终发现位于电容分压器瓷套内部电磁单元中间变压器引线断裂。最后对CVT设备的运行、维护、试验提出了一些措施及建议。

Abstract

A capacitive voltage transformer（CVT）on the 500kV side of the main transformer at a 500kV substation experienced the fault of secondary winding voltage loss during operation. Subsequently，a temporary power outage is implemented to perform the complete replacement of the faulty CVT. For analyzing the cause of the secondary voltage loss in the CVT，a series of such diagnostic tests as insulation resistance measurement，DC resistance measurement，ratio test，insulating oil analysis，dielectric loss test and capacitance measurement are performed on the faulty CVT. It is concluded that，in combination with the detailed analysis of the on-site inspection，the diagnostic test data and common causes for secondary voltage loss of the equipment in the fault，the cause of the fault is the breakdown of wire in the intermediate transformer within the CVT’s electromagnetic unit. For locating the exact broken position of the intermediate transformer in the CVT，the faulty CVT is disassembled on-site at the substation. The separated electromagnetic unit and capacitor unit are inspected and tested，finally finding that the wire in the intermediate transformer of electromagnetic unit inside the pocelain houding of capacutive voltage divider is broken.Finally，some measures and suggestions on the operation，maintenance and test of the VCT are propsoed.

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references

冯宇 . 电力互感器术语使用手册 [M ] . 北京 : 中国电力出版社 , 2017 .

熊亮 , 韦宇 , 庹印和 . 一起500 kV电容式电压互感器二次电压异常下降故障分析 [J ] . 科技与创新 , 2020 ( 18 ): 67 - 70 .

XIONG Liang , WEI Yu . TUO Yinhe . Analysis of abnormal secondary voltage drop fault in a 500 kV capacitive voltage transformer [J ] . Science and Technology & Innovation , 2020 ( 18 ): 67 - 70 .

徐鹏 , 殷鑑 , 沈亚春 , 等 . 一起220 kV CVT二次电压异常事件调查 [J ] . 电力电容器与无功补偿 , 2021 , 42 ( 5 ): 94 - 99 .

XU Peng , YIN Jian , SHEN Yachun , et al . Investigation of abnormal secondary voltage of 220 kV CVT [J ] . Power Capacitor & Reactive Power Compensation , 2021 , 42 ( 5 ): 94 - 99 .

王法顺 , 周刚 , 李伟琦 , 等 . 一起500 kV电容式电压互感器二次电压异常的故障分析 [J ] . 电气开关 , 2022 , 60 ( 2 ): 105 - 108 .

WANG Fashun , ZHOU Gang , LI Weiqi , et al . Fault analysis of an abnormal secondary voltage of 500 kV capacitive voltage transformer [J ] . Electric Switcher , 2022 , 60 ( 2 ): 105 - 108 .

郭一 . 电容式电压互感器二次电压异常分析及处置 [J ] . 山西电力 , 2023 ( 4 ): 39 - 42 .

GUO Yi . Analysis and disposal of abnormal secondary voltage of capacitive voltage transformer [J ] . Shanxi Electric Pow er , 2023 ( 4 ): 39 - 42 .

姚锡钦 . 一起110 kV电容式电压互感器二次电压异常的故障分析 [J ] . 变压器 , 2024 , 61 ( 6 ): 67 - 70 .

YAO Xiqin . Fault analysis of secondary voltage anomaly of 110 kV capacitive voltage transformer [J ] . Transformer , 2024 , 61 ( 6 ): 67 - 70 .

徐龙 , 肖泽宇 , 李丰 , 等 . 220 kV CVT二次电压异常典型案例分析 [J ] . 光源与照明 , 2021 ( 5 ): 92 - 94 .

XU Long , XIAO Zeyu , LI Feng , et al . Analysis of typical cases of abnormal secondary voltage in 220 kV CVT [J ] . Lamps & Lighting , 2021 ( 5 ): 92 - 94 .

张辉 , 黄海飞 , 钱苏华 , 等 . 一起220 kV电容式电压互感器介损超标分析 [J ] . 电力安全技术 , 2019 , 21 ( 8 ): 23 - 25 .

ZHANG Hui , HUANG Haifei , QIAN Suhua , et al . Analysis of a 220 kV capacitive voltage transformer with excessive dielectric loss [J ] . Electric Safety Technology , 2019 , 21 ( 8 ): 23 - 25 .

苏同斐 , 李红刚 . 电容式电压互感器介损超标案例分析 [J ] . 机电信息 , 2020 ( 17 ): 37 - 38 .

SU Tongfei , LI Honggang . Case analysis of excessive dielectric loss in capacitive voltage transformers [J ] . Mechanical and Electrical Information , 2020 ( 17 ): 37 - 38 .

梁曲栩 , 李涛 . 某500 kV电容式电压互感器介损异常原因分析 [J ] . 广西电力 , 2018 , 41 ( 6 ): 69 - 72 .

LIANG Quxu , LI Tao . Reason analysis of abnormal dielectric loss of a 500 kV capacitor voltage transformer [J ] . Guangxi Electric Power , 2018 , 41 ( 6 ): 69 - 72 .

赵铁羽 , 王清龙 , 徐腾飞 , 等 . 介损试验发现的35 kV电压互感器受潮缺陷分析 [J ] . 电工技术 , 2019 ( 1 ): 75 - 76 .

ZHAO Tieyu , WANG Qinglong , XU Tengfei , et al . Analysis on moisture defect of 35 kV voltage transformer discovered by dielectric loss test [J ] . Electric Engineering , 2019 ( 1 ): 75 - 76 .

童涛 , 徐碧川 , 袁思凡 , 等 . 一起电容式电压互感器二次电压异常事故分析 [J ] . 电瓷避雷器 , 2022 ( 2 ): 98 - 104 .

TONG Tao , XU Bichuan , YUAN Sifan , et al . A CVT secondary voltage abnormal accident [J ] . Insulators and Surge Arresters , 2022 ( 2 ): 98 - 104 .

黄繁朝 , 房博一 , 陈极升 . 一起500 kV线路CVT二次电压异常的故障分析 [J ] . 电工技术 , 2020 ( 12 ): 81 - 83 .

HUANG Fanchao , FANG Boyi , CHEN Jisheng . Fault analysis of a CVT secondary voltage abnormality of 500 kV line [J ] . Electric Engineering , 2020 ( 12 ): 81 - 83 .

王波 . 500 kV电容式电压互感器受潮故障原因 [J ] . 电工技术 , 2022 ( 16 ): 112 - 115 .

WANG Bo . Reasons for 500 kV capacitive voltage transformer dampedfault [J ] . Electric Engineering , 2022 ( 16 ): 112 - 115 .

于群英 , 赵春明 , 杨代勇 , 等 . 一起500 kV电容式电压互感器故障分析 [J ] . 吉林电力 , 2023 , 51 ( 5 ): 35 - 36 .

YU Qunying , ZHAO Chunming , YANG Daiyong , et al . Fault analysis of a 500 kV capacitive voltage transformer [J ] . Jilin Electric Power , 2023 , 51 ( 5 ): 35 - 36 .

戴向伟 . 500 kV CVT电磁单元故障分析 [J ] . 电力电容器与无功补偿 , 2019 , 40 ( 3 ): 105 - 109 .

DAI Xiangwei . Fault analysis on electromagnetic unit of 500 kV capacitor voltage transformer [J ] . Power Capacitor& Reactive Power Compensation , 2019 , 40 ( 3 ): 105 - 109 .

黄燕珠 . 35 kV电容式电压互感器故障原因分析 [J ] . 广西电力 , 2019 , 42 ( 4 ): 71 - 74 .

HUANG Yanzhu . Analysis of a 35 kV capacitive voltage transformer fault [J ] . Guangxi Electric Power , 2019 , 42 ( 4 ): 71 - 74 .

王贵山 , 李应宏 . 电容式电压互感器电磁单元故障原因分析及处理措施 [J ] . 广西电力 , 2020 , 43 ( 3 ): 67 - 70 .

WANG Guishan , LI Yinghong . Cause analysis and treatment of electromagnetic unit faults of capacitor voltage transformers [J ] . Guangxi Electric Power , 2020 , 43 ( 3 ): 67 - 70 .

刘隰蒲 , 王俊娜 , 乐佳琪 . 220 kV电容式电压互感器发热故障分析及预防措施 [J ] . 变压器 , 2021 , 58 ( 9 ): 81 - 83 .

LIU Xipu , WANG Junna , YUE Jiaqi . Fault analysis and preventive measures of 220 kV capacitive voltage transformer [J ] . Transformer , 2021 , 58 ( 9 ): 81 - 83 .

苏刚 , 文峰 , 杜航 , 等 . 220 kV电容式电压互感器(CVT)运行中异常发热缺陷分析 [J ] . 机电信息 , 2024 ( 19 ): 67 - 70 .

SU Gang , WEN Feng , DU Hang , et al . Analysis of abnormal heating defects in the operation of 220 kV capacitive voltage transformer(CVT) [J ] . Mechanical and Electrical Information , 2024 ( 19 ): 67 - 70 .

范茂金 . 一起500 kV电容式电压互感器异常发热原因分析 [J ] . 电世界 , 2024 , 65 ( 6 ): 9 - 13 .

FAN Maojin . Analysis of abnormal heating causes of 500 kV capacitive voltage transformers [J ] . Electric World , 2024 , 65 ( 6 ): 9 - 13 .

田浩 , 杨敏 , 陈小龙 , 等 . 500 kV电容式电压互感器异常发热原因分析及预防措施 [J ] . 电力电容器与无功补偿 , 2025 , 46 ( 1 ): 106 - 113 .

TIAN Hao , YANG Min , CHEN Xiaolong , et al . Analysis on abnormal heating and preventive measures of 500 kV capacitor voltage transformer [J ] . Power Capacitor & Reactive Power Compensation , 2025 , 46 ( 1 ): 106 - 113 .

胡顺 , 立梓辰 , 王子健 . 自激法在500 kV电容式电压互感器高压试验中的应用 [J ] . 电气技术与经济 , 2024 ( 4 ): 87 - 89 .

HU Shun , LI Zichen , WANG Zijian . Application of self excitation method in high voltage test of 500 kV capacitive voltage transformer [J ] . Electrical Equipment and Economy , 2024 ( 4 ): 87 - 89 .

易冉 , 梁育雄 , 黄启泰 , 等 . 一起220 kV CVT二次失压故障的分析与试验 [J ] . 电力电容器与无功补偿 , 2014 , 35 ( 5 ): 86 - 91,95 .

YI Ran , LIANG Yuxiong , HUANG Qitai , et al . Fault analysis and test on secondary voltage loss of 220 kV capacitor voltage transforme [J ] . Power Capacitor & Reactive Power Compensation , 2014 , 35 ( 5 ): 86 - 91,95 .

周志昊 , 杨芳芳 , 金雍奥 , 等 . 220 kV CVT二次绕组失压故障判别与分析 [J ] . 电工技术 , 2017 ( 9 ): 86 - 87 .

ZHOU Zhihao , YANG Fangfang , JIN Yongao , et al . Discrimination and analysis of voltage loss fault in 220 kV CVT secondary winding [J ] . Electric Engineering , 2017 ( 9 ): 86 - 87 .

乔亚军 , 林其雄 , 林李波 . 500 kV CVT电磁单元过热缺陷分析与处理 [J ] . 电力电容器与无功补偿 , 2015 , 36 ( 4 ): 61 - 63 .

QIAO Yajun , LIN Qixiong , LIN Libo . Overheat defect analysis and treatment on electromagnetic unit of 500 kV CVT [J ] . Power Capacitor & Reactive Power Compensation , 2015 , 36 ( 4 ): 61 - 63 .

变压器油中溶解气体分析和判断导则:DL/T 722—2014 [S ] . 2015 .

Guide to the analysis and the diagnosis of gases dissolved in transformer oil:DL/T 722—2014 [S ] . 2015 .

陈东明 , 王建伟 , 李旸 , 等 . 电容式电压互感器典型故障及缺陷分析 [J ] . 电力电容器与无功补偿 , 2024 , 45 ( 6 ): 36 - 43 .

CHEN Dongming , WANG Jianwei , LI Yang , et al . Analysis of typical faults and defects of capacitive voltage transformer [J ] . Power Capacitor & Reactive Power Compensation , 2024 , 45 ( 6 ): 36 - 43 .

陆丰 . 正接法测量CVT出现负介损原因分析 [J ] . 中国新技术新产品 , 2011 ( 24 ): 11 - 12 .

LU Feng . Analysis of negative dielectric loss in CVT measurement by positive connection method [J ] . China New Technology and Products , 2011 ( 24 ): 11 - 12 .

陈志高 . 介质损耗因数出现负值原因分析 [J ] . 广西电力 , 2012 , 35 ( 6 ): 66 - 69 .

CHEN Zhigao . Analysis of negative value of dielectric loss factor [J ] . Guangxi Electric Power , 2012 , 35 ( 6 ): 66 - 69 .

陈忠雷 . 介损测试产生负值的原因分析 [J ] . 贵州电力技术 , 2016 , 19 ( 7 ): 42 - 48 .

CHEN Zhonglei . Superficial analysis on the reason of negativevalues’generation in tan δ measurement [J ] . Guizhou Electric Power Technology , 2016 , 19 ( 7 ): 42 - 48 .

王晓琪 . 电力互感器 [M ] . 北京 : 中国电力出版社 , 2014 .

互感器第5部分:电容式电压互感器的补充技术要求:GB/T 20840. 5—2013 [S ] . 2013 .

Transformers—Part 5:supplementary technical requirements for capacitive voltage transformers:GB/T 20840.5—2013 [S ] . 2013 .

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