Transient Process Based Fault Phase Identification Method for Non-effectively Grounded System

被引：0

作者：

Qi Z. ^{[1
]}

Zheng Y. ^{[1
]}

Hang T. ^{[1
]}

Xue R. ^{[1
]}

Liu Z. ^{[1
]}

机构：

[1] School of Electrical and Electronic Engineering, North China Electric Power University, Beijing

来源：

Dianli Xitong Zidonghua/Automation of Electric Power Systems | 2018年 / 42卷 / 16期

关键词：

Fault phase identification; Intermittent arc; Multi-scale wavelet transformation; Single-phase-to-earth fault via arc; Transient high-frequency components;

D O I：

10.7500/AEPS20171202001

中图分类号：

学科分类号：

摘要：

In order to suppress the arc of the single-phase-to-earth fault in neutral point non-effectively grounded system, the operation which switches the fault phase to the earth has been widely used. The prerequisite of this method is to identify fault phase correctly in one cycle. However, the traditional fault phase identification method based on steady process is prone to failure in the case of grounding fault via intermittent arc. This paper analyzes the defects of the conventional methods, establishes the equivalent model of distribution network, and derives the transient time domain expression of the three-phase voltages after the arc extinguishing. The multi-scale wavelet transformation is used to extract the transient high-frequency components of three-phase voltages. A novel method is proposed to identify the fault phase by calculating the amplitude and phase characteristics of the high-frequency components and the conventional methods are combined with this novel method. The simulation results prove the effectiveness of the proposed identification method. © 2018 Automation of Electric Power Systems Press.

引用

页码：155 / 160

页数：5

共 21 条

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