Analysis of Single-phase Grounding Fault with Line-Broken on Overhead Transmission Lines

doi:10.11930/j.issn.1004-9649.2013.2.65.6

Abstract

Abstract: Single-phase grounding faults with line-broken occur frequently in overhead distribution systems of 6~66 kV, which may endanger personal safety and interrupt power supply. Considering the grounding points on load side and the types of loads, the currents and voltages at grounding and broken points and protection installation positions and on the load sides were analyzed respectively, and the formulas and phasor diagrams of voltages and currents at each point were deduced. The study results show that voltages of grounding points and protection installation positions have a relationship with load characteristics and fault resistance. However, the broken point voltage has a relationship with load characteristics only. PSCAD simulation proves correctness of the conclusions. Thus a theoretical foundation is established to identify the single-phase grounding faults, line-broken faults and grounding faults with line-broken.

Key words: non-solidly earthed network, overhead line, single-phase grounding fault with line-broken, fault analysis

CLC Number:

TM772

ZHANG Hui-fen, SANG Zai-zhong. Analysis of Single-phase Grounding Fault with Line-Broken on Overhead Transmission Lines[J]. Electric Power, 2013, 46(2): 65-71.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.2013.2.65.6

https://www.electricpower.com.cn/EN/Y2013/V46/I2/65

References

[1] 要焕年,曹梅月.电力系统谐振接地[M]. 北京：中国电力出版社,2000：151-161.
[2] 李润先.中压电网系统接地实用技术[M]. 北京：中国电力出版社,2001：216-260.
[3] 张慧芬.配电网单相接地故障检测技术研究[D]. 济南：山东大学,2006：1-12.
[4] 陈晓娟,王丽,隋吉生,等. 一种配电网单相接地故障定位新方法[J]. 中国电力,2011,44（10）：33-36.
CHEN Xiao-juan, WANG Li, SUI Ji-sheng, et al . A new method of single-phase ground fault location in 10 kV distribution network[J]. Electric Power, 2011,44(10):33-36.
[5] 韩凤玲,王毅,许承斌,等.树形分支电网单相断线兼接地故障特征[J]. 哈尔滨工业大学学报,1998,30（2）：16-20.
HAN Feng-ling, WANG Yi, XU Cheng-bin, et al . Fault features of line break with short-circuit for tree-type distribution line[J]. Journal of Harbin Institute of Technology, 1998,30(2):16-20.
[6] 贾文超,宋作忠. 10 kV直配线路单相断线兼接地故障实用诊断方法[J]. 广西工学院学报,1999,10（1）：45-49.
JIA Wen-chao, SONG Zuo-zhong. A practical method for line- open with line-to-ground fault diagnosis on 10 kV direct distribution lines[J]. Journal of Guangxi Institute of Technology, 1999,10(1):45-49.
[7] 李建华. 10 kV小电阻接地系统断线接地故障仿真计算[J]. 上海电力,2006,（1）：61-63.
LI Jian-hua. Simulation and calculation of line-open with line-to- ground fault in 10 kV resistance-grounded neutral system[J]. Shanghai Electrical Power, 2006,(1):61-63.
[8] 朱玲玲,李长凯,张华中,等.配电网单相断线故障负序电流分析及选线[J]. 电力系统保护与控制,2009,37（9）：35-38,43.
ZHU Ling-ling, LI Chang-kai, ZHANG Hua-zhong, et al . Negative sequence current distributing and single-phase open-line fault protection in distribution network[J]. Power System Protection and Control, 2009,37(9):35-38,43.
[9] 张慧芬,潘贞存,桑在中.小电流接地系统单相断线加接地故障的分析[J]. 继电器,2004,32（18）：6-9.
ZHANG Hui-fen, PAN Zhen-cun, SANG Zai-zhong. Analysis of complex line breaking and grounding fault in the power system with neutral point indirectly grounded[J]. Relay, 2004,32(18):6-9.
[10] 朱玲玲,张华中,王正刚,等.基于小波神经网络单相断线故障选线和定位[J]. 电力系统保护与控制,2011,39（4）：12-17.
ZHU Ling-ling, ZHANG Hua-zhong, WANG Zheng-gang, et al . Single-phase open-line fault selection and location based on wavelet neural networks[J]. Power System Protection and Control, 2011,39(4):12-17.
[11] 刘万顺. 电力系统故障分析[M]. 北京：水利电力出版社,1990：137-170.
[12] 黄国兵.三相异步电动机负序阻抗探讨[J].科技广场,2005（12）：113-114.
HUANG Guo-bing. Discussion of three-phase asynchronism electromotor negative-order impedance[J]. Science Mosaic, 2005(12): 113-114.