短导体对水平接地极冲击特性的影响

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摘要冲击接地实验研究表明,在放射状的水平接地极上合适位置添加短导体后能使接地极周围的时变电场趋于均匀分布。本文针对短导体的布置方式展开研究,采用时域差分思想和多物理场有限元分析相结合的仿真方法,以单根水平接地极和添加短导体后的水平接地极为研究对象,从屏蔽效应强弱的角度分析了7种结构接地极的冲击特性。结果表明：在水平接地极上布置短导体时存在弱屏蔽区域,在弱屏蔽区域之外短导体受端部作用影响较大;同种短导体结构接地极的屏蔽效应随着注入电流幅值的增加而增大;在短导体长度与接地极的长度比为1/30的情况下,短导体间距与接地极长度的比例在10%~15%之间时较其他结构的接地极中部散流值比例较大,屏蔽作用较弱。

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	袁涛
	唐妍
	司马文霞
	杨庆
	姜文东
	曹炯

关键词 ：短导体, 接地极, 冲击特性, 屏蔽效应, 时域差分, 有限元法

Abstract：The existing engineering application of practical and impact grounding test research show that the radial horizontal grounding electrode on the proper position after adding short conductors can make time-varying electric field tended to distribute more evenly around the grounding body. The paper hereby is aimed at the arrangement of short conductor using the skill of difference time domain method and multiple physical field direct coupling analysis software (COMSOL). The single horizontal grounding electrode and grounding electrodes adding short conductors are the research objects. This paper analyzes the influence of the impact characteristic of seven kinds of grounding electrodes from the view of current shielding effect. The results show that the short conductor arrangement exist weak shielding area in a specific horizontal grounding electrode and outside the weak shielding area short conductors are greatly influenced by end effect. The shielding effect increases with the increase of injection current amplitude for the same structure. In the cases of the short conductor length and horizontal grounding electrode length ratio of 1/30, the proportion of central diffuser value of grounding electrode is bigger and shielding effect is weaker than that of other structure when adjacent short conductors spacing and horizontal grounding electrode length ratio between 10%~15%.

Key words： Short conductor grounding electrodes impact characteristics current shielding effect difference time domain finite element method.

收稿日期: 2013-04-29 出版日期: 2015-03-23

PACS:

TM761.1

基金资助:国家创新研究群体基金（51021005）,国家重点基础研究发展计划（973计划）（2009CB 724504）和国家自然科学基金（51107153）资助项目

作者简介: 袁涛男,1976年生,博士,副教授,硕士生导师,从事电力系统过电压及接地技术研究。唐妍女,1987年生,硕士研究生,研究方向为防雷与接地技术。

引用本文:

袁涛, 唐妍, 司马文霞, 杨庆, 姜文东, 曹炯. 短导体对水平接地极冲击特性的影响[J]. 电工技术学报, 2015, 30(1): 177-185. Yuan Tao, Tang Yan, Sima Wenxia, Yang Qing, Jiang Wendong, Cao Jiong. Simulation Analysis of the Impact Characteristic of Grounding Electrode Based on the Current Shielding Effect. Transactions of China Electrotechnical Society, 2015, 30(1): 177-185.

链接本文:

http://dgjsxb.ces-transaction.com/CN/Y2015/V30/I1/177

[1] 袁涛, 雷超平, 司马文霞, 等. 提高接地极散流效率的冲击接地降阻分析[J]. 电工技术学报, 2012, 27(11): 278-284. Yuan Tao, Lei Chaoping, Sima Wenxia, et al. Analysis of grounding resistance reduction effect based on enhancing impulse current leakage efficiency[J]. Transactions of China Electrotechnical Society, 2012, 27(11): 278-284.
[2] Dawalibe F, Mukhedkar D. Optimum design of substation grounding in two-layer earth structure, part I, II, Ⅲ[J]. IEEE Transactions Power Apparatus and Systems, 1975, 94(2): 252-272.
[3] Qi Lei, Cui Xiang, Zhao Zhibin, et al. Grounding performance analysis of the substation grounding grids by finite element method in frequency domain[J]. IEEE Transactions on Magnetics, 2007, 43(4): 1181- 1184.
[4] Lorentzou M I, Hatziargyriou N D, Papadias B C. Time domain analysis of grounding electrodes impulse response[J]. IEEE Transactions on Power Delivery, 2003, 18(2): 517-524.
[5] He Jinliang, Gao Yanqing, Zeng Rong. Effective length of counterpoise wire under lightning current[J]. IEEE Transactions on Power Delivery, 2005, 22(2): 1585-1591.
[6] 司马文霞, 雷超平, 袁涛, 等. 改善冲击散流时地中电场分布的接地降阻试验[J]. 高电压技术, 2011, 37(9): 2294-2301. Sima Wenxia, Lei Chaoping, Yuan Tao, et al. Experi- mental study on grounding resistance reduction based on improved grounding electric field distribution induced by the diffuser of impulse current[J]. High Voltage Engineering, 2011, 37(9): 2294-2301.
[7] Tesche F M, Lanoz M V, Torbjorn Karlsson. EMC analysis methods and computational models[M]. New York: John Wiley &Sons, 1996.
[8] Selby A, Dawalibi F. Determination of current distribu- tion in energized conductors for the computation of electromagnetic fields[J]. IEEE Transactions on Power Delivery, 1994, 9(2): 1069-1078.
[9] Leonid Grcev, Farid Dawalibi. An electromagnetic model for transients in grounding system[J]. IEEE Transactions on Power Systems, 1990, 5(4): 1773- 1781.
[10] Leonid Grcev. Computer analysis of transient voltages in large grounding systems[J]. IEEE Transactions on Power Systems, 1996, 11(2): 815-823.
[11] 杨琳, 吴广宁, 曹晓斌, 等. 接地体雷电暂态响应建模分析[J]. 中国电机工程学报, 2011, 31(13): 142-146. Yang Lin, Wu Guangning, Cao Xiaobin, et al. Modeling of grounding electrode for lightning transient response analysis[J]. Proceedings of the CSEE, 2011, 31(13): 142-146.
[12] 甄永赞, 崔翔, 罗兆楠, 等. 直流输电线路三维合成电场计算的有限元方法[J]. 电工技术学报, 2011, 26(4): 153-160. Zhen Yongzan, Cui Xiang, Luo Zhaonan, et al. FEM for 3D total electric field calculation near HVDC lines[J]. Transactions of China Electrotechnical Society, 2011, 26(4): 153-160.
[13] Grcev Leonid D, Heimbach Markus. Frequency dependent and transient characteristics of substation grounding systems[J]. IEEE Transactions on Power Systems, 1997, 12(1): 172-178.
[14] 俞集辉, 孟庆福. 线性有限元计算的外推插值法[J]. 电工技术学报, 1995, 10(3): 37-42. Yu Jihui, Meng Qingfu. Finite element method of extrapolation and interpolation[J]. Transactions of China Electrotechnical Society, 1995, 10(3): 37-42.
[15] Habjanic Anton, Trlep Mladen. The simulation of the soil ionization phenomenon around the grounding system by the finite element method[J]. IEEE Transac- tions on Magnetic, 2006, 42(4): 867-870.
[16] Nekhoul B, Guerin C, Labie P, et al. A finite element method for calculating the electromagnetic fields generated by substation grounding systems[J]. IEEE Transactions on Magnetics, 1995, 31(3): 2150-2153.
[17] Stochniol A. A general transformation for open boundary finite element method for electromagnetic problems[J]. IEEE Transactions on Magnetics, 1992, 28(2): 1679-1681.
[18] Mousa A M. The soil ionization gradient associated with discharge of high currents into concentrated electrodes[J]. IEEE Transactions on Power Delivery, 1994, 9(3): 1669-1677.