电网不对称条件下小电流接地系统接地相辨识

摘要
图/表
参考文献
相关文章 (15)

全文: PDF (476 KB)
输出: BibTeX | EndNote (RIS)

摘要当中压电网发生单相接地故障时, 在电网不对称和存在较大过渡电阻情况下确定接地相是比较复杂和困难的。传统判据往往忽略电网不对称的影响。本文运用相量图分析了发生单相接地故障后电网不对称电压和过渡电阻对中性点电压和相电压的影响, 认为中性点电压的轨迹不是半圆, 而是一段圆弧, 并且在某些情况下辨识故障相的传统判据并不适用。在此基础上, 本文提出通过构造一种新的“相”矢量的方法进行接地相辨识。理论分析和仿真结果表明该方法能够克服传统方法的缺点, 准确判断接地相。

	服务

	把本文推荐给朋友
	加入我的书架
	加入引用管理器
	E-mail Alert
	RSS
	作者相关文章
	徐波
	张建文
	蔡旭
	管珊莲
	姚勇

关键词 ：不对称电压, 过渡电阻, 中性点电压, 相电压, 接地相

Abstract：When a single-line-to-ground fault happens in the power grid, it is complex and difficult to determine the ground phase especially in the case of an unsymmetrical voltage and a large transition resistance. And the unsymmetrical voltage is often ignored because of simplified analyses in the previous literature. In this paper, with these factors considered a detailed analysis of the single-line-to-ground fault and the phasor diagram of the line-to-neutral voltages are presented firstly. It is concluded that the trajectory of the neutral voltage is no longer a semi-circular, but a circular arc. What is worse, in some cases it is not suitable to apply the traditional criterions that the previous literature proposed. A new method of constructing three new “phase” vectors is presented to identify the ground phase. Theoretical analyses and simulations show that the method can overcome the shortcomings of traditional methods and determine the grounding phase accurately.

Key words： Unsymmetrical voltage transition resistance neutral voltage phase voltages ground phase

收稿日期: 2010-05-13 出版日期: 2014-03-10

PACS:

TM773

基金资助:上海市科技发展基金资助项目(08DZ1200504, 09DZ1201303)

作者简介: 徐波男, 1981年生, 博士, 主要研究方向为消弧线圈, 配电网故障诊断、保护、运行等。张建文男, 1981年生, 博士, 主要研究方向为配电自动化与保护、电力电子技术。

引用本文:

徐波, 张建文, 蔡旭, 管珊莲, 姚勇. 电网不对称条件下小电流接地系统接地相辨识[J]. 电工技术学报, 2011, 26(12): 175-182. Xu Bo, Zhang Jianwen, Cai Xu, Guan Shanlian, Yao Yong. Grounding Phase Determination in Non-Effective Grounding Systems in Case of Unsymmetrical Voltage. Transactions of China Electrotechnical Society, 2011, 26(12): 175-182.

链接本文:

http://dgjsxb.ces-transaction.com/CN/Y2011/V26/I12/175

[1] 王祖光. 微机小电流接地系统接地选择装置[J]. 电力系统自动化, 1993, 17(6): 48-51.
Wang Zuguang. Feeder earth fault selecting device for neutral isolated and Petersen coil grounded systems[J]. Automation of Electric Power Systems, 1993, 17(6): 48-51.
[2] 牟龙华. 零序电流有功分量方向接地选线保护原理[J]. 电网技术, 1999, 23(9): 60-62.
Mu Longhua. Principle of selective grounding fault protection based on active component direction of zero-sequence current[J]. Power System Technology, 1999, 23(9): 60-62.
[3] 廖文树. 热电厂消弧线圈及接地选线的技术改造[J]. 电力自动化设备, 2010, 30(9): 143-145.
Liao Wenshu. Technical reformation of arc suppression coils and grounding line selection[J]. Electric Power Automation Equipment, 2010, 30(9): 143-145.
[4] 蔡旭, 李仕平, 杜永忠, 等. 变阻尼调匝式消弧线圈及接地选线综合控制器[J]. 电力系统自动化, 2004, 28(5): 85-89.
Cai Xu, Li Shiping, Du Yongzhong, et al. An integrated controller of multi-tap arc-suppression with variational damp and detection of earth fault feeder[J]. Automation of Electric Power Systems, 2004, 28(5): 85-89.
[5] 蔡旭, 于乐中. 补偿电网增量函数法接地选线原理及应用[J]. 上海交通大学学报, 2004, 38(8): 1273-1274.
Cai Xu, Yu Lezhong. Protection and its application for detecting single phase earth fault feeder based on increment function principle in resonant grounded power distribution system[J]. Journal of Shanghai Jiao Tong University, 2004, 38(8): 1273-1274.
[6] Elkalashy N I, Lehtonen M, et al. Operation evaluation of DWT-based earth fault detection in unearthed MV networks[C]. 12th International Middle-East Power System Conference, 2008: 208-212.
[7] 王耀南, 霍百林, 王辉, 等. 基于小波包的小电流接地系统故障选线的新判据[J]. 中国电机工程学报, 2004, 24(6): 54-58.
Wang Yaonan, Huo Bailin, Wang Hui, et al. A new criterion for earth fault line selection based on wavelet packets in small current neutral grounding system[J]. Proceedings of the CSEE, 2004, 24(6): 54-58.
[8] Chaari O, Meunier M, Brouaye F. Wavelets: a new tool for the resonant grounded power distribution systems relaying[J]. IEEE Transactions on Power Delivery, 1996, 11(3): 1301-1308.
[9] 张帆, 潘贞存, 张慧芬, 等. 基于零序电流暂态极大值的小电流接地选线新判据[J]. 电力系统自动化, 2006, 30(4): 45-49.
Zhang Fan, Pan Zhencun, Zhang Huifen, et al. New criterion of fault line selection in non-solidly earthed network based on the maximum of zero sequence transient current[J]. Automation of Electric Power Systems, 2006, 30(4): 45-49.
[10] 束洪春, 司大军, 葛耀中, 等. 人工神经网络应用于输电线路故障测距研究[J]. 电工技术学报, 2000, 15(6):61-64.
Shu Hongchun, Si Dajun, Ge Yaozhong, et al. Study of applying ANN to locating fault on HV transmission lines[J]. Transactions of China Electrotechnical Society, 2000, 15(6):61-64.
[11] 张庆超, 姚斌, 杨金飞, 等. 基于RS维数的小电流接地系统故障选线和定位[J]. 电工技术学报, 2007, 22(12): 164-169.
Zhang Qingchao, Yao Bin, Yang Jinfei, et al. Fault line identification and fault location of non-direct ground neutral system based on RS dimension[J]. Transactions of China Electrotechnical Society, 2007, 22(12): 164-169.
[12] 庞清乐, 孙同景, 钟麦英, 等. 基于粗集理论的小电流接地系统故障选线[J]. 中国电机工程学报, 2007, 27(4): 60-64.
Pang Qingle, Sun Tongjing, Zhong Maiying, et al. Fault line detection based on rough set theory in indirectly grounding power system[J]. Proceedings of the CSEE, 2007, 27(4): 60-64.
[13] 高艳, 林湘宁, 刘沛. 基于广义形态开闭变换的小电流接地选线算法[J]. 中国电机工程学报, 2006, 26(14): 1-5.
Gao Jun, Lin Xiangning, Liu Pei. Generalized morphological opening-closing transform based feeder selection algorithm for neutral uneffectual grounded system[J]. Proceedings of the CSEE, 2006, 26(14): 1-5.
[14] 束洪春, 赵文渊, 彭仕欣. 配电网缆—线混合线路故障选线的HHT检测方法[J]. 电力自动化设备, 2009, 29(5): 4-9.
Shu Hongchun, Zhao Wenyuan, Pen Shixin. Faulty line selection based on HHT detection for hybrid distribution network[J]. Electric Power Automation Equipment, 2009, 29(5): 4-9.
[15] 潘贞存, 张慧芬, 张帆, 等. 信号注入式接地选线定位保护的分析与改进[J]. 电力系统自动化, 2007, 31(4): 71-75.
Pan Zhencun, Zhang Huifen, Zhang Fan, et al. Analysis and modification of signal injection based fault line selection protection[J]. Automation of Electric Power Systems, 2007, 31(4): 71-75.
[16] 陈禾, 陈维贤. 配电线路的零序电流和故障选线新方法[J]. 高电压技术, 2007, 33(1): 49-52, 65.
Chen He, Chen Weixian. Zero-sequence and new method of fault line location in distribution network[J]. High Voltage Engineering, 2007, 33(1): 49-52, 65.
[17] 秦光培. 单相接地时电网各电压变化规律及其应用[J]. 昆明理工大学学报, 1998, 23(5): 11-16.
Qin Guangpei. Earth voltage variable law and its application of the network when single phase-ground[J]. Journal of Kunming University of Science and Technology, 1998, 23(5): 11-16.
[18] 牟龙华, 黄善成. 中性点不直接接地系统单相接地故障特点分析[J]. 煤炭科学技术, 1999, 27(2): 33-35.
Mu Longhua, Huang Shancheng. Analysis of single phase-to-ground faults in neutral ungrounded systems[J]. Coal Science and Technology, 1999, 27(2): 33-35.
[19] 余水忠. 小电流接地系统经过渡电阻接地的分析[J]. 继电器, 2001, 29(4): 21-23.
Yu Shuizhong. Analysis of neutral grounded via a transition resistor[J]. Relay, 2001, 29(4): 21-23.
[20] 李如琦, 黄欢, 张振兴, 等. 小电流系统单相不完全接地故障分析[J]. 广西大学学报(自然科学版), 2007, 32(4): 367-370.
Li Ruqi, Huang Huan, Zhang Zhenxing, et al. Analyzing of single-phase and indirectly grounding fault in small current system[J]. Journal of Guangxi University(Nat. Sci. Ed), 2007, 32(4): 367-370.
[21] 要焕年, 曹梅月. 电力系统谐振接地[M]. 2版. 北京: 中国电力出版社, 2009.
[22] 国家电网公司. 10kV~66kV消弧线圈管理规范[M]. 北京: 中国电力出版社, 2006.
[23] DL/T 1057—2007. 自动跟踪补偿消弧线圈成套装置技术条件[S].
[24] 蔡旭. 测定补偿电网阻尼率及电容电流的简化法[J]. 高电压技术, 1997, 23(2): 38-40.
Cai Xu. A method of measuring the damping ratio and capacity current of the resonant grounded power grid[J]. High Voltage Engineering, 1997, 23(2): 38-40.