Analysis on Influence of Transient Overvoltage on Insulation Performance of Bipolar Neutral Line Surge Capacitor

ZHANG Hongwei; YANG Xiaojing; JI Kai; LI Yu

doi:10.14044/j.1674-1757.pcrpc.2025.03.008

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Analysis on Influence of Transient Overvoltage on Insulation Performance of Bipolar Neutral Line Surge Capacitor

Capacitor | 更新时间：2025-07-02

- Analysis on Influence of Transient Overvoltage on Insulation Performance of Bipolar Neutral Line Surge Capacitor
- Power Capacitor & Reactive Power Compensation Vol. 46, Issue 3, Pages: 61-68(2025)
- 作者机构：
  
  1.国网甘肃省电力公司金昌供电公司，甘肃　金昌　737100
  2.西安西电电力电容器有限责任公司，西安　710082
- 作者简介：
- 基金信息：
- DOI：10.14044/j.1674-1757.pcrpc.2025.03.008
  CLC：
- Received：01 September 2024，
  
  Published：25 June 2025
- 稿件说明：
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ZHANG Hongwei, YANG Xiaojing, JI Kai, et al. Analysis on Influence of Transient Overvoltage on Insulation Performance of Bipolar Neutral Line Surge Capacitor[J]. Power capacitor & reactive power compensation, 2025, 46(3): 61-68.
DOI：

ZHANG Hongwei, YANG Xiaojing, JI Kai, et al. Analysis on Influence of Transient Overvoltage on Insulation Performance of Bipolar Neutral Line Surge Capacitor[J]. Power capacitor & reactive power compensation, 2025, 46(3): 61-68. DOI： 10.14044/j.1674-1757.pcrpc.2025.03.008.

摘要

中性线冲击电容器的主要作用是降低低次谐波和抑制雷电冲击，但是当冲击电压达到一定值时，能量会在短时间内大量积聚，导致电容器内部绝缘击穿并爆炸。本文分析了某±500 kV直流换流站双极中性母线暂态过电压对双极冲击电容器组绝缘性能的影响，通过放电故障现象、特征分析和解体试验，论证了双极中性母线过电压及绝缘配合设计、暂态过电压对中性母线冲击电容器绝缘劣化影响等问题，并提出了防范措施，对直流换流站安全运行具有重要借鉴意义。

Abstract

The main function of neutral line surge capacitor is to reduce low order harmonics and suppress lightning surge. However

when the surge voltage reaches a certain value

the energy will accumulate in a large amount in a short period of time

causing insulation breakdown and explosion inside the capacitor. In this paper

the influence of transient overvoltage on the insulation performance of bipolar surge capacitor at a ± 500 kV DC converter station is analyzed. Through the analysis of discharge fault phenomena and characteristics analysis as well as disassembly tests

such issues as the design of bipolar neutral bus overvoltage and insulation coordination

as well as the influence of transient overvoltage on the insulation degradation of neutral bus surge capacitor are demonstrated. Moreover

the preventive measures are proposed

which have important reference significance for safe operation of DC converter station.

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