Study on Damage Mechanism of Film-paper Insulation of CVT Under Different Electric Fields

HE Da; LI Bowen; YANG Zhi; ZHENG Yiming; LIN Jiajun; ZHANG Qiaogen

doi:10.13296/j.1001-1609.hva.2026.02.013

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Study on Damage Mechanism of Film-paper Insulation of CVT Under Different Electric Fields

Research & Analysis | 更新时间：2026-03-16

- Study on Damage Mechanism of Film-paper Insulation of CVT Under Different Electric Fields
- High Voltage Apparatus Vol. 62, Issue 2, Pages: 102-111(2026)
- 作者机构：
  
  西安交通大学电气工程学院，西安 710049
  国网浙江省电力有限公司电力科学研究院，杭州 310007
- 作者简介：
- 基金信息：
- DOI：10.13296/j.1001-1609.hva.2026.02.013
  CLC：
- Received：11 July 2025，
  
  Revised：2025-10-18，
  
  Published：16 February 2026
- 稿件说明：
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HE Da, LI Bowen, YANG Zhi, et al. Study on Damage Mechanism of Film-paper Insulation of CVT Under Different Electric Fields[J]. High Voltage Apparatus, 2026, 62(2): 102-111.
DOI：

HE Da, LI Bowen, YANG Zhi, et al. Study on Damage Mechanism of Film-paper Insulation of CVT Under Different Electric Fields[J]. High Voltage Apparatus, 2026, 62(2): 102-111. DOI： 10.13296/j.1001-1609.hva.2026.02.013.

摘要

电容式电压互感器（CVT）在超/特高压电力系统中得到了广泛使用。CVT发生故障将影响电能计量的准确可靠和电网运行的稳定安全。文中以故障发生率最高的CVT电容单元为研究对象，通过制作适用于反映CVT电容心子电极缺陷的试样，搭建对应的实验平台，进行不同电场形式下的击穿实验并分析试品击穿点分布，研究了工频电压、正、负极性雷电冲击电压和交流叠加冲击复合电场下膜纸绝缘的损坏机制。实验结果表明，CVT电容心子的铝箔电极边缘缺陷是导致膜纸绝缘损坏的主要原因，电极缺陷的种类及变化决定了击穿点的空间分布规律。聚丙烯薄膜对正负空间电荷“陷阱”效果的差异性，会引起复合电场不同叠加幅值、叠加相位下击穿点主导类型的转变。

Abstract

Capacitor voltage transformers (CVT) are used widely in EHV/UHV power systems. The failure of CVT not only affects the accuracy and reliability of electric energy measurement but also the stable and safe operation of power grid. In this paper the CVT capacitor unit with the highest fault rate is taken as the research object. By making the sample suitable for reflecting the electrode defects of CVT capacitor core

the corresponding experimental platform is set up to perform the breakdown experiment under different electric field conditions and analyze the breakdown point distribution of the sample. Moreover

the damage mechanism of film paper insulation under power frequency voltage

positive and negative polarity lightning impulse voltage and AC superposition impulse composite electric field is studied. The experimental results show that the edge defect of aluminum foil electrode of CVT capacitor core is the main cause for the insulation damage of film paper

and the types and changes of electrode defects determine the spatial distribution of breakdown points. However

the difference in the‘trap’effect of polypropylene film on positive and negative space charges will lead to transformation of the dominant type of breakdown point under different superposition amplitude and phase.

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references

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