Equivalent Circuit and Calculation Method for Analysis of Residual Current in Low-voltage Distribution Network

被引：0
|
作者：
Sun Z. [1 ]
Xu B. [1 ,2 ]
Wang W. [2 ]
Yang F. [3 ]
Chen H. [2 ]
Wang P. [2 ]
机构：
[1] School of Electrical Engineering, Shandong University, Jinan
[2] School of Electrical and Electronic Engineering, Shandong University of Technology, Zibo
[3] Electric Power Research Institute of State Grid Hubei Electric Power Co., Ltd., Wuhan
来源：
Dianli Xitong Zidonghua/Automation of Electric Power Systems | 2023年 / 47卷 / 10期
基金：
中国国家自然科学基金;
关键词：
equivalent circuit; grounding fault; load switching; low-voltage distribution network; residual current;
D O I：
10.7500/AEPS20221122001
中图分类号：
学科分类号：
摘要：
The existing equivalent circuits and calculation methods for analysis of residual current in the low-voltage distribution network haven’t taken into account TN-C and TN-C-S systems, which is difficult to meet the requirements of distinguishing grounding faults and load switching. Therefore, a modeling and calculation method for low-voltage distribution networks with various grounding types is proposed. For the circuit equations of different grounding types, a fourth-order phase-mode transformation matrix is proposed, and the independent 1 mode, 2 mode, coupled 0 mode and N-line mode are obtained. The residual current mode network is then obtained by adjusting and transferring the mutual impedance of 0 mode and N-line mode. According to the boundary conditions of grounding faults and load switching, the equivalent circuits of residual current analysis are constructed, and the calculation formulas of electrical quantities are derived. Simulation and test results show that the proposed method has strong applicability and high calculation accuracy, which provide a theoretical analysis basis for the research of grounding fault protection technologies. © 2023 Automation of Electric Power Systems Press. All rights reserved.
引用
收藏
页码：98 / 106
页数：8
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