Single-phase Grounding Fault Detection in Non-solidly Earthed Network Based on Negative Sequence Characteristics of Low-voltage Side

被引：0

作者：

Zhang M. ^{[1
,4
]}

Luan W. ^{[2
]}

Ai X. ^{[1
]}

Xu B. ^{[3
]}

机构：

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

[2] School of Electrical and Information Engineering, Tianjin University, Nankai District, Tianjin

[3] School of Electrical and Electronic Engineering, Shandong University of Technology, Shandong Province, Zibo

[4] China Electric Power Research Institute, Haidian District, Beijing

来源：

Dianwang Jishu/Power System Technology | 2024年 / 48卷 / 04期

关键词：

fault detection; low-voltage measurements; negative sequence signals; single-phase grounding fault; un-effectual grounding system;

D O I：

10.13335/j.1000-3673.pst.2023.1698

中图分类号：

学科分类号：

摘要：

With the gradual maturity of intelligent terminal measurement technology in the low-voltage distribution network, achieving holographic perception on the low-voltage side while also possessing the ability to monitor multiple points of the medium-voltage distribution network. This paper proposed a method of single-phase grounding fault detection for an un-effectual grounding system based on the low-voltage side's negative-sequence characteristics. The characteristics of the negative sequence signal at the low-voltage side after a single-phase grounding fault occurred on the medium-voltage side are analyzed; the negative-sequence current can distinguish the fault and non-fault lines. after setting the ratio coefficient of negative-sequence voltage and positive-sequence voltage, multi-point collaborative calculation and comparison can be used to determine the section of the fault point. The unbalanced load at the low-voltage side and the special case of a fault point at one end of the line are considered. Through the simulation of medium-voltage and low-voltage combined distribution systems in MATLAB software and dynamic model experiment, it is verified that the proposed method has good robustness and accuracy. Monitoring the status information of the medium-voltage distribution network through the smart distribution transformer terminal to realize the fault detection of neutral un-effectual grounding systems has great potential in practical application and implementation. © 2024 Power System Technology Press. All rights reserved.

引用

页码：1654 / 1662

页数：8

共 23 条

[1]

CHENG Lu, CHEN Qiaofu, A survey on faulty line selection technology for single-phase grounded transmission line in small current neutral grounded system[J], Power System Technology, 33, 18, pp. 219-224, (2009)

[2]

ZHANG Mingze, LUAN Wenpeng, AI Xin, Single-phase grounding fault detection in non-solidly earthed network based on low-voltage measurements[J], Power System Technology, 47, 8, pp. 3457-3466, (2023)

[3]

LIANG Dong, XU Bingyin, TANG Yi, Model and detection method for tree-contact single-phase-to-ground faults on 10kV overhead lines[J], Proceedings of the CSEE, 41, 15, pp. 5221-5232, (2021)

[4]

LIU Shuo, LIU Hao, BI Tianshu, Fault detection of distribution network considering high impedance faults[J], Power System Technology, 47, 8, pp. 3438-3447, (2023)

[5]

QIN Jike, NING Xin, FAN Songhai, Discharge ignition mechanism of tree-contacting single-phase-to-ground faults of overhead lines[J], Power System Technology, 47, 3, pp. 1289-1298, (2023)

[6]

REN Wei, XUE Yongduan, YANG Fan, Modeling and analysis of arc grounding faults in isolated neutral distribution network[J], Power System Technology, 45, 2, pp. 705-712, (2021)

[7]

Jian LIU, ZHANG Xiaoqing, SHEN Wei, Performance testing of single phase to earth fault location for distribution network with neutral point non-effectively grounded systems[J], Automation of Electric Power Systems, 42, 1, pp. 138-143, (2018)

[8]

ZENG Xiangjun, YIN Xainggen, YU Yongyuan, New methods for control and protection relay in a compensated medium voltage distribution network based on injecting various frequency current[J], Proceedings of the CSEE, 20, 1, pp. 29-32, (2000)

[9]

LUAN Xiaoming, WU Shouyuan, JIA Chunjuan, Fault line selection principle of single-phase-to-ground fault based on improved zero-sequence admittance[J], Power System Technology, 46, 1, pp. 353-360, (2022)

[10]

SANG Zaizhong, ZHANG Huifen, PAN Zhencun, Protection for single phase to earth fault line selection for ungrounded power system by injecting signal[J], Automation of Electric Power Systems, 20, 2, pp. 11-12, (1996)

← 1 2 3 →