Diagnosis and Simulation Analysis of Gas Generation Faults in Conventional Upright Oil-Immersed Current Transformers

WANG Yingjie; CHEN Bo; BAI Jie; ZHAO Shun; LIU Xuefang; Che Chuanqiang

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Diagnosis and Simulation Analysis of Gas Generation Faults in Conventional Upright Oil-Immersed Current Transformers

更新时间：2026-07-06

- Diagnosis and Simulation Analysis of Gas Generation Faults in Conventional Upright Oil-Immersed Current Transformers
- High VoltageApparatus (2026)
- 作者机构：
  
  1.内蒙古电力集团有限责任公司内蒙古电力科学研究院分公司，呼和浩特 010020
  2.内蒙古自治区电力系统智能化电网仿真企业重点实验室，呼和浩特 010020
  3.Inner Mongolia Power Dispatching Control Center, Hohhot 010010, China
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Received：10 June 2025，
  
  Revised：2025-11-13，
  
  Accepted：17 November 2025，
- 稿件说明：
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WANG Yingjie, CHEN Bo, BAI Jie, et al. Diagnosis and Simulation Analysis of Gas Generation Faults in Conventional Upright Oil-Immersed Current Transformers[J/OL]. High VoltageApparatus, 2026.
DOI：

WANG Yingjie, CHEN Bo, BAI Jie, et al. Diagnosis and Simulation Analysis of Gas Generation Faults in Conventional Upright Oil-Immersed Current Transformers[J/OL]. High VoltageApparatus, 2026. DOI：

摘要

为研究油浸正立式电流互感器“产气—电容屏微放电”的联系，结合某地区共3台同型号220kV电流互感器发生波纹膨胀器顶盖故障，对其中2台互感器开展了故障分析工作。对故障电流互感器开展绝缘电阻、介损值电容量测试及油气分析试验，发现故障互感器油中H

、总烃及C

均超过注意值，绝缘油介损值超过注意值。随后对故障电流互感器开展解体检查，发现其一次绕组外部的绝缘纸及各层电容屏存在大量褶皱，工艺缺陷明显。基于COMSOL Multiphysics 6.3，建立一次绕组外部及油纸绝缘、褶皱气隙有限元模型，仿真分析其工艺缺陷状况下的放电过程，结合解体和试验结果，明确了故障原因。

Abstract

To investigate the correlation between gas generation and capacitive screen micro-discharge in oil-immersed upright current transformers

failure analysis was performed on two out of three 220kV current transformers (same model) that experienced bellows expansion tank cover failures in a regional power grid. The faulty units

underwent insulation resistance measurement

dielectric loss tangent (tanδ) and capacitance testing

and dissolved gas analysis (DGA). Results revealed that hydrogen (H

)

total hydrocarbon content

and ethylene (C

) concentrations in the insulating oil exceeded warning thresholds

accompanied by elevated dielectric loss values. Post-disassembly inspections identified significant wrinkling in the insulation paper surrounding the primary winding and across capacitive screen layers

indicating critical manufacturing defects. Using COMSOL Multiphysics 6.3

finite element models were developed to simulate the primary winding’s external insulation structure

oil-paper interfaces

and wrinkled air gaps. Partial discharge processes under these defect conditions were analyzed

confirming that insulation irregularities and capacitive screen deformation induced localized electric field concentrations. Combined with experimental and dissection findings

the root cause was attributed to progressive micro-discharges at wrinkled regions

exacerbated by degraded oil insulation properties

ultimately leading to gas accumulation and structural failure.

关键词

Keywords

references

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