基于频带有功功率系数的接地故障方向保护方法

doi:10.6040/j.issn.1672-3961.0.2020.416

山东大学学报 (工学版) ›› 2021, Vol. 51 ›› Issue (1): 76-86.doi: 10.6040/j.issn.1672-3961.0.2020.416

基于频带有功功率系数的接地故障方向保护方法

刘远龙^1,2,刘伟生²,王鹏玮^3*,吴斌⁴,张恒旭¹,徐丙垠³

1. 山东大学电气工程学院, 山东济南 250100;2. 国网山东省电力公司, 山东济南 250001;3. 山东理工大学电气与电子工程学院, 山东淄博 255000;4. 国网山东省电力公司泰安供电公司, 山东泰安 271000

出版日期:2021-02-20 发布日期:2021-03-01
作者简介:刘远龙(1971— ),男,江苏南通人,教授级高级工程师,博士研究生,主要研究方向为电力系统继电保护. E-mail:liuyuanlong@126.com. *通信作者简介:王鹏玮(1996— ),男,山东潍坊人,硕士研究生,主要研究方向为电力系统继电保护. E-mail:wpwsdut@163.com
基金资助:
国家电网山东省电力公司科技项目(52060918016T)

Earth fault protection method based on frequency band power factor

LIU Yuanlong^1,2,LIU Weisheng²,WANG Pengwei^3*,WU Bin⁴,ZHANG Hengxu¹,XU Bingyin³

1. School of Electrical Engineering, Shandong University, Jinan 250100, Shandong, China;
2. State Grid Shandong Electric Power Company, Jinan 250061, Shandong, China;
3. College of Electrical and Electronic Engineering, Shandong University of Technology, Zibo 255000, Shandong, China;
4. Tai'an Power Supply Company, State Grid Shandong Electric Power Company, Taian 271000, Shandong, China

Online:2021-02-20 Published:2021-03-01

摘要/Abstract

摘要： 提出计算80 Hz以下频带内零序信号的有功功率系数,即固定时间窗内信号的有功功率与视在功率之比,根据有功功率系数的极性与绝对值可有效识别接地故障方向。数字仿真与实际故障录波数据验证了所提方法实现高阻接地保护的可行性,证明该方法可用于不稳定电弧与间歇性故障,能够避免电流互感器测量误差引起的误动问题。

关键词: 小电流接地故障, 有功功率因数, 频带, 间歇性故障, 零序电流互感器

Abstract: This paper proposed a method to calculate an active power coefficient of the zero-sequence signal in the frequency band below 80 Hz. The coefficient was defined the ratio of active to apparent power within a fixed time window. This method identified the fault direction through the polarity and absoluted value of the coefficient. Digital simulation and actual fault recordings data had verified the feasibility of the proposed method, which could trip reliably for high impedance faults, and avoid the current transformer error.

Key words: low current earth fault, active power coefficient, frequency band, intermittent fault, zero-sequence current transformer

中图分类号:

TM771

刘远龙, 刘伟生, 王鹏玮, 吴斌, 张恒旭, 徐丙垠. 基于频带有功功率系数的接地故障方向保护方法[J]. 山东大学学报 (工学版), 2021, 51(1): 76-86.

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基于频带有功功率系数的接地故障方向保护方法

Earth fault protection method based on frequency band power factor

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