电器与能效管理技术 ›› 2025, Vol. 0 ›› Issue (5): 56-62.doi: 10.16628/j.cnki.2095-8188.2025.05.008

• 电器设计与探讨 • 上一篇    下一篇

切换电容接触器合闸涌流的研究

李新叶, 陈百胜, 郑云   

  1. 德力西电气有限公司, 上海 201803
  • 收稿日期:2025-03-20 出版日期:2025-05-30 发布日期:2025-07-24
  • 作者简介:李新叶(1975—),男,工程师,主要从事低压电器研发与制造。|陈百胜(1976—),男,工程师,主要从事低压电器研发与制造。|郑云(1986—),男,工程师,主要从事低压电器研发与制造。

Research on Inrush Current of Capacitor-Switching Contactor

LI Xinye, CHEN Baisheng, ZHENG Yun   

  1. Delixi Electric Co.Ltd., Shanghai 201803, China
  • Received:2025-03-20 Online:2025-05-30 Published:2025-07-24

摘要:

电力电容器接入线路会产生200倍额定电流以上的合闸涌流,带限流电阻的切换电容接触器常用于抑制合闸涌流。为了优化抑制效果,通过随机抑制涌流实验研究电容器组投入时的合闸涌流波形,定义了一、二次合闸涌流。在同一台切换电容接触器更换3种不同阻值的限流电阻,投切相同容量的电容器组获取抑制涌流波形。研究发现,限流电阻值过小则一次涌流会超出应用要求,限流电阻值过大则二次涌流会超出应用要求,但选取合适的限流电阻值可使对一、二次涌流的抑制达到预期效果。为切换电容接触器的检验、选型以及限流电阻值的确定提供参考。

关键词: 切换电容器接触器, 限流电阻, 涌流抑制, 一、二次涌流

Abstract:

When power capacitors are connected to a circuit, a switching inrush current exceeding 200 times the rated current will be generated.The capacitor switching contactor with a current-limiting resistor is often used to suppress the switching inrush current.In order to optimize the suppression effect,the switching inrush current waveform when the capacitor bank is put into operation is studied through the random inrush current suppression experiments,and the primary and secondary switching inrush currents are defined. Three current-limiting resistors with different resistance values are replaced on the same capacitor switching contactor,and the inrush current suppression waveforms are obtained by switching the capacitor banks with the same capacity.The study finds that if the resistance value of the current-limiting resistor is too small,the primary inrush current will exceed the application requirements,if the resistance value of the current-limiting resistor is too large,the secondary inrush current will exceed the application requirements.However,a suitable resistance value of the current-limiting resistor is selected to make the suppression of the primary and secondary inrush currents achieve the expected effect.This provides a reference for the inspection and selection of capacitor-switching contactors and the determination of the resistance value of the current-limiting resistor.

Key words: capacitor-switching contactor, current-limiting resistance, inrush current suppression, primary and secondary inrush current

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