Short-circuit Characteristic Analysis of Dry-type DC Capacitor Based on Magnetic-structure Field Coupling

LI Peng; QIU Yu; YUE Guohua; DU Zhiye; YAO Cheng; LIU Gang

doi:10.13296/j.1001-1609.hva.2026.02.012

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Short-circuit Characteristic Analysis of Dry-type DC Capacitor Based on Magnetic-structure Field Coupling

Research & Analysis | 更新时间：2026-03-16

- Short-circuit Characteristic Analysis of Dry-type DC Capacitor Based on Magnetic-structure Field Coupling
- High Voltage Apparatus Vol. 62, Issue 2, Pages: 94-101(2026)
- 作者机构：
  
  湖北省输电线路工程技术研究中心，湖北宜昌 443002
  三峡大学电气与新能源学院，湖北宜昌 443002
  武汉大学电气与自动化学院，武汉 430072
  南方电网科学研究院有限责任公司，广州 510700
- 作者简介：
- 基金信息：
  
  National Natural Science Foundation of China(51977152);S&T Program of CSG Electric Power Research Institute(CG1500062001576425)
- DOI：10.13296/j.1001-1609.hva.2026.02.012
  CLC：
- Received：20 July 2025，
  
  Revised：2025-10-01，
  
  Published：16 February 2026
- 稿件说明：
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LI Peng, QIU Yu, YUE Guohua, et al. Short-circuit Characteristic Analysis of Dry-type DC Capacitor Based on Magnetic-structure Field Coupling[J]. High Voltage Apparatus, 2026, 62(2): 94-101.
DOI：

LI Peng, QIU Yu, YUE Guohua, et al. Short-circuit Characteristic Analysis of Dry-type DC Capacitor Based on Magnetic-structure Field Coupling[J]. High Voltage Apparatus, 2026, 62(2): 94-101. DOI： 10.13296/j.1001-1609.hva.2026.02.012.

摘要

干式直流电容器作为柔性直流输电系统中的关键设备，被广泛应用于滤波、电压支撑等重要场合，确保其长期安全可靠地运行具有重要意义。电容器突发外部短路故障时，急剧增加的短路电流流过内部汇流排，从而产生较大的电动力，容易造成电容器结构失效。为研究短路电流冲击下电容器耐受短路电动力的问题，以某型号干式直流电容器为研究对象，基于磁—结构场耦合计算方法，对电容器短路状态时的电动力分布、结构应力以及形变进行计算与分析。结果表明：发生外部短路故障时，电容器内部最大短路电动力数值达10.8 kN；电容器的形变主要出现在引出铜板及其附近区域，且越靠近汇流排中部形变量越大；引出端子呈现明显地向下挤压趋势。研究成果为电容器机械强度校验以及结构优化设计提供理论参考。

Abstract

Dry-type DC capacitors

as a key equipment in VSC-HVDC transmission system

are used widely in such important applications as filtering and voltage support. It is of great significance to ensure the long-term

safe and reliable operation of dry-type DC capacitors. In case of external short-circuit fault in the capacitor

the rapidly increased short-circuit curren will flow through the internal busbar and result in great electrodynamic force

which easily cause structural failure of the capacitor. In order to study the issue of capacitor withstanding short-circuit electrodynamic force under short-circuit current impact

in this paper a type of dry-type DC capacitor is taken as the research object

the short-circuit electrodynamic force distribution

deformation as well as stress of the capacitor under shortcircuit conditions are calculated and analyzed based on calculation method of magnetic-structure field coupling. The results show that in case of external short-circuit fault

the maximum short circuit electrodynamic force of the capacitor reaches 10.8 kN. The deformation of the capacitor mainly occurs on the leading-out copper busbar and its surrounding areas

and the deformation approaching the middle part of the busbar is larger. The leading-out terminal shows an obvious downward squeezing trend. The research results in this paper provide theoretical reference for mechanical strength check and structural optimization design of capacitor.

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Analysis of Short-circuit Characteristic of Dry-type DC Capacitor Based on Magnetic-structure Field Coupling

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