中国电力 ›› 2014, Vol. 47 ›› Issue (1): 35-38.DOI: 10.11930/j.issn.1004-9649.2014.1.35.3

• 电网 • 上一篇    下一篇

考虑线路参数非线性特征的零序电流增益分析

陈昊1, 2, 王玉荣2, 周永荣3   

  1. 1. 江苏省电力公司 检修分公司,江苏 南京 211102;
    2. 东南大学 电气工程学院,江苏 南京 210096;
    3. 国网电力科学研究院 实验验证中心,江苏 南京 210061
  • 收稿日期:2013-10-09 出版日期:2014-01-31 发布日期:2015-12-18
  • 作者简介:陈昊(1980-),男,江苏南京人,博士研究生,高级工程师,从事继电保护、电力系统故障分析研究。E-mail: pingfengma@126.com

Analysis of Zero-Sequence Current Gain Considering Nonlinearity of Line Parameters

CHEN Hao1, 2, WANG Yu-rong2, ZHOU Yong-rong3   

  1. 1. Jiangsu Electric Power Maintenance Branch Company, Nanjing 211102, China;
    2. School of Electrical Engineering, Southeast University, Nanjing 210096, China;
    3. Experiment and Verification Center, State Grid Electric Power Research Institute, Nanjing 200061, China
  • Received:2013-10-09 Online:2014-01-31 Published:2015-12-18

摘要: 单相接地是电网的常见故障,线路发生单相接地故障时,保护动作三相跳闸后,后跳开侧零序电流有时出现突变的现象。故障波形分析表明,这种零序电流增益在一定程度上受线路参数非线性特征的影响。为此,在考虑线路参数非线性特征基础上,分析线路非线性参数和故障点位置参数与零序电流的定量关系,为更好地解释故障过程及理解故障后的保护行为提供依据,仿真结果表明了该理论分析的准确性。

关键词: 单相接地故障, 零序电流增益, 三相跳闸, 线路零序阻抗。

Abstract: Single-phase earthing faults occur commonly in a power grid. While a single-phase earthing fault happens following the three-phase tripping in transmission line, the zero-sequence current at the later tripped side usually has a sudden change. According to the analysis of fault waveforms, the gain of zero-sequence current may be affected by the nonlinearity of line parameters to some degree. Taking into account the nonlinearity of transmission line parameters, the relationship among line parameters, fault points and zero-sequence current is analyzed quantitatively. The study results are helpful for better understanding the action of relays after faults. The simulation results verify the accuracy of the theory analysis.

Key words: single-phase earthing fault, zero-sequence current gain, three-phase tripping, zero-sequence resistance of line

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