Simulation of Residual Current in Low Voltage DC Systems

2021 IEEE 66th Holm Conference on Electrical Contacts (HLM) Pub Date : 2021-10-24 DOI:10.1109/HLM51431.2021.9671160

Jing Wang, Zhimin Xie, Silei Chen, Xingwen Li

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引用次数: 2

Abstract

With the development of new energy industry, low voltage DC system (LVDC) has been developed rapidly in the municipal and residential field. DC residual current has become a key problem threatening the safe and stable operation of low voltage DC system. In the DC system, the voltage fluctuation generated by the rectifier and the system circulating net currents generated by the line with different positive and negative parameters would interfere with the detection of residual current operated protective devices (RCD). In this paper, the effects of current on human beings was analyzed firstly. Then the impedance model of human body was built for different electric shock conditions. Meanwhile, the representative electric shock simulation models of TN, TT and IT systems were established. And the characteristics of residual current caused by direct and indirect electric shock in different grounding modes were researched. Next, the influence of system factors on circulating net currents and the detection of residual current was analyzed. On this basis, the configurations of RCD in DC system were proposed finally, protecting human body from electric shock and preventing electric fire accident threats.

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低压直流系统中剩余电流的仿真

随着新能源产业的发展，低压直流系统(LVDC)在市政和住宅领域得到了迅速发展。直流漏电已成为威胁低压直流系统安全稳定运行的关键问题。在直流系统中，整流器产生的电压波动和不同正负参数线路产生的系统循环净电流会干扰RCD (residual current operating protection device)的检测。本文首先分析了电流对人体的影响。然后建立了不同触电条件下人体阻抗模型。同时，建立了具有代表性的TN、TT和IT系统的电击仿真模型。研究了不同接地方式下直接触电和间接触电产生的剩余电流特性。其次，分析了系统因素对循环净电流和剩余电流检测的影响。在此基础上，最后提出了直流系统中RCD的配置，以保护人体免受触电和防止电气火灾事故威胁。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2021 IEEE 66th Holm Conference on Electrical Contacts (HLM)

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