谐振接地系统两点同相接地故障暂态特征及选线

doi:10.11930/j.issn.1004-9649.202204040

摘要/Abstract

摘要： 针对配电网两点同相接地故障选线准确率低的问题，依据零序电流和零序电压的暂态特性，提出一种适用于谐振接地系统两点同相接地故障的选线新方法。首先，建立并简化两点接地故障等效零序网络，推导各线路零序电流暂态量和母线零序电压暂态量的关系式，分析得到两点同相故障的暂态特征。其次，通过函数拟合得到各线路的零序对地分布电容和故障过渡电阻，利用故障线路过渡电阻远小于健全线路的特征，并结合线路始端零序电流暂态量与纯容性电流暂态量的差值大小，形成选线判据。最后，分别对不同工况下的两点同相接地故障进行了仿真，结果表明所提方法可准确同时选出2条故障线路，且适用于高阻故障。

关键词: 谐振接地系统, 暂态特征量, 两点同相接地, 故障选线, 过渡电阻

Abstract: Aiming at the low accuracy problem in line selection of two-point grounding faults on same phase in distribution network, a new fault feeder identification method suitable for two-point grounding faults on same phase in resonant grounding systems is proposed according to the transient characteristics of zero-sequence current (ZSC) and zero-sequence voltage (ZSV). Firstly, an equivalent zero-sequence network of two-point grounding fault is established and simplified, and the relationship between the ZSC transient of each line and the bus ZSV transient is derived, and the transient characteristics of two-point grounding faults on same phase are analyzed. And then, the fault transition resistance and zero-sequence distributed capacitance to ground of each line are obtained through fitting function, and a new fault line selection criterion is established based on the characteristic that the transition resistance of fault lines is far smaller than that of health lines, and the difference of transient characteristic quantities between zero-sequence current and capacitive current of each line. Finally, simulations are conducted on the two-point grounding faults on same phase under different working conditions, and the results show that the proposed method can accurately select two fault lines at the same time, and it is suitable for high impedance faults.

Key words: resonant grounding system, transient characteristic quantity, two-point grounding fault on same phase, fault line selection, transition resistance

刘映彤, 黄纯, 袁静泊, 闫森. 谐振接地系统两点同相接地故障暂态特征及选线[J]. 中国电力, 2022, 55(10): 62-70.

LIU Yingtong, HUANG Chun, YUAN Jingbo, YAN Sen. Transient Characteristics and Line Selection of Two-Point Grounding Faults on Same Phase in Resonant Grounding System[J]. Electric Power, 2022, 55(10): 62-70.

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https://www.electricpower.com.cn/CN/Y2022/V55/I10/62

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