并联电感-电容支路对空气电弧电流转移特性的影响

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中图分类号：TM561 文献标志码：A

DOI： 10.7652/xjtuxb202508016 文章编号：0253-987X（2025）08-0168-09

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 （School of Electrical Engineering，Xi'an Jiaotong University，Xi'an 7loo49，China）

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 to . The results indicate that increasing the resonant frequency of the LC branch at a 5kA main circuit current can shorten the current transfer time to 0.84ms 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.

Keywords： direct current interruption; air arc; external transverse magnetic field; current commutation;magnetically controlled oscillation

直流断路器是直流电力系统中保障供电灵活性与可靠性的关键设备，当系统发生故障时，断路器需快速、可靠地实现故障电流的开断，以确保系统安全稳定运行[1-2]。（剩余12180字）