配电网馈出线路单相永久性接地故障性质辨识方法

doi:10.19595/j.cnki.1000-6753.tces.191493

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摘要配电网单相接地故障的发展与故障过渡电阻的变化相互关联。过渡电阻变大,故障电流减小,有利于故障消失;过渡电阻变小,增强了原有的故障;过渡电阻不变,则为一个稳定的永久故障。利用故障馈线的零序分量构造伏安曲线,根据曲线面积直线拟合的斜率推测故障过渡电阻的变化,进而推断此次单相接地故障的性质。根据故障性质的预判使中性点相应地投入消弧线圈或小电阻,利用中性点变化所导致的零序电流相位及幅值变化检验故障是否消失,进一步确定单相接地故障的性质。该辨识方法易于在工程应用中实现,可提高配电网的故障自愈能力和单相接地保护的自适应性。

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	董俊
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关键词 ：单相接地故障, 曲面面积, 中性点接地方式, 故障性质辨识

Abstract：The single phase ground fault of the distribution network is related to the change of the fault transition resistance. With the increase of the transition resistance, the fault current will decrease and the fault will disappear; with the decrease of the transition resistance, the original fault will be strengthened; if the transition resistance remains unchanged, it will be a stable permanent fault.Using the zero sequence component of the fault feeder to construct the V-I curve, calculate the curve area and make a straight-line fitting, using the slope of the straight-line to infer the change of the fault transition resistance, and then infer the nature of the single-phase ground fault.According to the prediction of fault nature, the neutral point is put into arc suppression coil or small resistance correspondingly. The phase and amplitude changes of zero sequence current caused by the change of neutral point are used to check whether the fault disappears, and the nature of single-phase ground fault is further determined. This identification method is easy to realize in engineering application, and can improve the self-healing ability of distribution network and the adaptability of single-phase grounding protection.

Key words： Single phase ground fault curve area neutral grounding mode identification of fault property

收稿日期: 2019-11-15

PACS:

TM773

基金资助:国家自然科学基金（51667010）和云南省科技计划重大科技专项（202002AF080001）资助项目

通讯作者: 束洪春男,1961年生,博士,博士生导师,研究方向为电力系统新型继电保护与故障测距、故障录波、数字信号处理及DSP应用。E-mail：kmshc@sina.com.cn

作者简介: 董俊男,1977年生,博士研究生,讲师,研究方向为配电网故障检测、保护与自愈。E-mail：dongjun_kust@sina.com

引用本文:

董俊, 李一凡, 束洪春, 于继来. 配电网馈出线路单相永久性接地故障性质辨识方法[J]. 电工技术学报, 2020, 35(21): 4576-4585. Dong Jun, Li Yifan, Shu Hongchun, Yu Jilai. Study on Identification Method of Single Phase Permanent Ground Fault in Distribution Network Feedout Line. Transactions of China Electrotechnical Society, 2020, 35(21): 4576-4585.

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