High Sensitivity Protection Method of Low-resistance Grounding System Based on 5G Technology

2022 7th Asia Conference on Power and Electrical Engineering (ACPEE) Pub Date : 2022-04-01 DOI:10.1109/ACPEE53904.2022.9783833

Wanying Yan, Jiandong Duan, Z. Hou, Xiaotong Du

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Abstract

Abstract—In order to resolve the problem about weak sensitivity of high-resistance ground fault in low-resistance grounding system, this paper analyzes the characteristics of zero-sequence (ZS) network when single phase grounding fault occurs in distribution network. It can be concluded that neutral point ZS current is approximately equal to ZS current of fault feeder and always much larger than ZS current of non-fault feeder. And the phase angle difference between neutral point ZS current and fault feeder ZS current is greater than that between neutral point ZS current and non-fault feeder ZS current. Based on this, a comparison method of ZS current with double judgement based on 5G technology is proposed. This method ensures that the information of the ZS current of the neutral point can be accurately transmitted to each protection device on time, forming a local protection. Through theoretical and simulation analysis, this method improves the sensitivity and reliability of high resistance grounding fault protection without changing the existing protection devices.

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基于5G技术的低阻接地系统高灵敏度保护方法

摘要为了解决低阻接地系统中高阻接地故障灵敏度弱的问题，分析了配电网单相接地故障时零序(ZS)网络的特点。可以得出中性点ZS电流近似等于故障馈线的ZS电流，且总是远大于非故障馈线的ZS电流。中性点ZS电流与故障馈线ZS电流相位角差大于中性点ZS电流与非故障馈线ZS电流相位角差。在此基础上，提出了一种基于5G技术的双判断ZS电流比较方法。这种方法保证了中性点的ZS电流信息能及时准确地传递到各个保护装置，形成局部保护。通过理论和仿真分析，该方法在不改变现有保护装置的情况下，提高了高阻接地故障保护的灵敏度和可靠性。

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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2022 7th Asia Conference on Power and Electrical Engineering (ACPEE)

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