Influence of Parallel Inductance-Capacitance Branches on Current Commutation Characteristics of Air Arcs

ZHANG Yushi; WU Yi; SUN Hao; WU Yifei; RONG Mingzhe; LIU Tianxiao; KONG Ziyang

doi:10.7652/xjtuxb202508016

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Influence of Parallel Inductance-Capacitance Branches on Current Commutation Characteristics of Air Arcs

更新时间：2025-07-30

- Influence of Parallel Inductance-Capacitance Branches on Current Commutation Characteristics of Air Arcs
- Journal of Xi’an Jiaotong University Vol. 59, Issue 8, Pages: 168-176(2025)
- 作者机构：
  
  西安交通大学电气工程学院， 710049，西安
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb202508016
  CLC： TM561
- Received：11 March 2025，
  
  Online First：23 April 2025，
  
  Published：10 August 2025
- 稿件说明：
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ZHANG Yushi, WU Yi, SUN Hao, et al. Influence of Parallel Inductance-Capacitance Branches on Current Commutation Characteristics of Air Arcs[J]. Journal of Xi’an Jiaotong University, 2025, 59(8): 168-176.
DOI：

ZHANG Yushi, WU Yi, SUN Hao, et al. Influence of Parallel Inductance-Capacitance Branches on Current Commutation Characteristics of Air Arcs[J]. Journal of Xi’an Jiaotong University, 2025, 59(8): 168-176. DOI： 10.7652/xjtuxb202508016.

摘要

针对直流电力系统中故障电流开断的技术难题，提出了一种基于空气电弧磁控振荡特性的直流开断方案。通过对狭缝内空气电弧施加外加横向磁场，使电弧电压周期性振荡，从而在电弧与电感-电容（LC）支路间形成负阻尼振荡电流，促进故障电流转移并最终实现电流开断。实验研究了4种并联LC支路谐振频率下的电流转移过程，并分析了5～13 kA主回路电流下转移支路电容对转移电流峰值的影响。结果表明：5 kA主回路电流下提高LC支路谐振频率可缩短电流转移时间至0.84 ms，但当主回路电流增大时，需将LC支路的谐振频率调节至与电弧振荡频率一致，方可制造电弧电流过零点；增大转移支路电容可有效提升初始转移峰值电流，从而增强电流转移能力；电流转移过程中磁场衰减会导致电弧电压上升速率降低，影响谐振电流负阻尼振荡的持续性。研究验证了空气电弧磁控振荡式直流开断方案的可行性，为经济型直流断路器设计提供了新思路。

Abstract

To address the technical challenge of interrupting fault currents in direct current (DC) power systems

a DC interruption scheme based on the magnetic control oscillation characteristics of air arcs is proposed. Applying an external transverse magnetic field to the air arc within a narrow gap enables the arc voltage to oscillate periodically

thereby creating a negative damping oscillating current between the arc and the inductor-capacitor (LC) branch. This facilitates fault current transfer

ultimately achieving current interruption. Experimental studies are conducted on the current transfer process at the resonant frequencies of four parallel LC branches

and the effect of the transfer branch capacitance on the peak transfer current is analyzed for main circuit currents ranging from 5 kA to 13 kA. The results indicate that increasing the resonant frequency of the LC branch at a 5 kA main circuit current can shorten the current transfer time to 0.84 ms. However

as the main circuit current increases

the resonant frequency of the LC branch needs to be adjusted to match the oscillation frequency of the arc to create a zero-crossing of the arc current. Increasing the capacitance of the transfer branch effectively enhances the initial peak transfer current

thereby boosting the current transfer capability. Additionally

the attenuation of the magnetic field during the current transfer process leads to a decreased rate of rise in arc voltage

affecting the continuity of the resonant current's negative damping oscillation. This study validates the feasibility of the air arc magnetic control oscillation-based DC interruption scheme

providing a new approach for the design of economical DC circuit breakers.

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references

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