基于电磁场的杆塔接地体冲击特性计算分析

doi:10.11930/j.issn.1004-9649.2014.8.83.4

摘要/Abstract

摘要： 输电线路杆塔接地体的冲击接地阻抗决定了雷击输电线路或杆塔时的塔顶电位,从而影响线路绝缘子串两端的过电压水平,直接关系到线路的耐雷水平。接地体在雷电流作用下的冲击特性表现为火花效应和电感效应,使接地体的冲击特性明显区别于工频特性。基于电磁场理论建立了输电杆塔典型接地体冲击接地阻抗计算模型,通过模型试验验证了其准确性,得到了接地体在不同土壤电阻率和射线长度下的冲击接地阻抗,并与国际著名的接地计算软件CDEGS工频接地阻抗计算结果对比分析,进一步揭示了接地体的工频和冲击特性的差异,同时验证了接地体冲击电流下存在有效长度。

关键词: 接地体, 冲击特性, 电磁场, 仿真分析, 杆塔, CDEGS, 计算模型

Abstract: Potential rise of the transmission line towers depends on the grounding resistance when the lines or towers are stricken by lightning,which determines the overvoltage between the terminals of an insulator string and the performance against lightning strike of the transmission lines. Impulse characteristics of the grounding conductors manifest as spark effect and inductive effect, which make it different from the characteristics of the power frequency. Based on electromagnetic theory, a mathematical model was built to calculate the impulse grounding resistance of a typical grounding grid for towers with different length in different soil resistivity. The accuracy of the proposed model was verified by model tests and a comparison with the calculated grounding resistance at power frequency by the well-known grounding software CDEGS further reveals the difference between power and impulse characteristics, and confirms that there is an effective length for grounding system under impulse current.

Key words: grounding system, impulse characteristic, electromagnetic field, simulation analyses, tower, CDEGS, calculation model

中图分类号:

TM83

朱昌成, 邢鹏翔, 鲁海亮, 蓝磊, 冯志强. 基于电磁场的杆塔接地体冲击特性计算分析[J]. 中国电力, 2014, 47(8): 83-87.

ZHU Chang-cheng, XING Peng-xiang, LU Hai-liang, LAN Lei, FENG Zhi-qiang. Analyses of the Impulse Characteristics of Tower Grounding Devices Based on Electromagnetic Field[J]. Electric Power, 2014, 47(8): 83-87.

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https://www.electricpower.com.cn/CN/Y2014/V47/I8/83

参考文献

[1] 武汉高压研究所.输电线路雷击跳闸率计算方法和500 kV超高压防雷设计中的几个问题[R]. 1982.
[2] China Electric Power Research Institute. Influence and mitigation of 1 000 kV UHV AC double-circuit transmission line on metallic pipeline[R]. Beijing: China Electric Power Research Institute, 2009.
[3] 张禄琦,郝阳,张小力,等. 1 000 kV与500 kV同塔四回交流输电线路杆塔型式研究[J]. 中国电力,2013,46（4）：32-36.
ZHANG Lu-qi, HAO Yang, ZHANG Xiao-li, et al . Study on tower types of 1 000 kV and 500 kV four-circuit AC transmission lines on one tower [J]. Electric Power, 2013, 46(4): 32-36.
[4] 王涛,时卫东,张小青,等. 一般化三电极接地电阻测量方法[J]. 中国电力,2011,44（3）：31-33.
WANG Tao, SHI Wei-dong, ZHANG Xiao-qing, et al . A generalized three-electrode grounding resistance measurement method [J]. Electric Power, 2011, 44(3): 31-33.
[5] 于洋,程韧俐,沈智健,等. 雷害参数相关性分析和雷电预警[J]. 中国电力,2012,45（8）：20-23.
YU Yang, CHENG Ren-li, SHEN Zhi-jian, et al . Method for online outdoor electrical equipment lightning warning based on grey relation analysis [J]. Electric Power, 2012, 45(8): 20-23.
[6] FURUKAWA S, USUDA O, ISOZAKI T. Development and application of lighting arrests for transmission lines[J]. IEEE T-PWRD, 1989, 4(4): 2121-2129.
[7] 何金良,曾嵘. 电力系统接地技术[M]. 北京：科学出版社,2007.
[8] 解广润. 电力系统接地技术[M]. 北京：水利电力出版社,1991.
[9] 陈先禄,刘渝根,黄勇. 接地[M]. 重庆：重庆大学出版社,2001.
[10] 周泽存. 高电压技术[M]. 3版. 北京：中国电力出版社,2007.
[11] TOWNE H M. Impulse characteristics of driven grounds[J].General Electric Review, 1928, 31: 605-609.
[12] PETROPOULOS G M. The high voltage characteristics of earth resistance [J]. IEE Proceeding, 1948, 95(2): 59-70.
[13] BELLASCHI P L. Impulse and 60 cycle characteristic of driven ground [J]. AIEE Transactions, 1940, 60(3): 123-128.
[14] WANG Jun-ping, LIEW A C, DARVENIZA M. Extension of dynamic model of impulse behavior of concentrated grounds at high currents [J]. IEEE Transactions, 1940, 60(3): 123-128.
[15] LIEW A C, DARVENIZA M. Dynamic model of impulse characteristics of concentrate earths[J]. IEE Proceedings, 1974,121(2): 123-135.
[16] 高延庆. 考虑土壤电离的接地系统冲击特性研究[D]. 北京：清华大学,2001.
[17] SONG Ze-qing, HE Jing-liang, RAGHUVEER M R. Experimental study on lightning breakdown channels in the soils[J]. IEE High Voltage Engineering Symp, 1999, 467(2): 426-429.
[18] 罗仕乾. 雷电波的频谱及能量分布[J]. 高电压技术,1995,21（1）：85-86.
LUO Shi-qian. The spectrum and energy distribution of lightning wave [J]. High Voltage Engineering, 1995, 21(1): 85-86.
[19] OTERO A F, CIDRAS J, GARRIDO C. Frequency analysis of grounding systems[C]//Proc of 8th International Conference on Harmonics and Quality of Power, 1998: 348-353.
[20] 辛亮,傅正财,魏本刚. 变电站接地网的暂态分析方法综述[J].电网技术,2007,31（21）：56-59.
XIN Liang, FU Zheng-cai, WEI Ben-gang. Survey on method for transient performance analysis of substation grounding network [J]. Power System Technology, 2007, 31(21): 56-59.
[21] DAWALIBI F. Electromagnetic fields generated by overhead and buried short conductors, Part 1: signal conductor[J]. IEEE Transaction on Power Delivery, 1986, 1(4): 105-111.
[22] DAWALIBI F. Electromagnetic field generated by overhead and buried short conductors, Part 2: signal conductor[J]. IEEE Transactions on Power Delivery, 1986, 1(4): 112-119.
[23] 郭剑. 变电站接地系统冲击特性的全时分析方法研究[D]. 北京：清华大学,2005.
[24] SUNDE E D. Earth conduction effects in transmission on systems[M]. New York: Dover publication, 1968.
[25] GRCEV L, DAWALIBI F. An electromagnetic model for transients in grounding systems[J]. IEEE Trans on Power Delivery, 1990, 5(4): 1773-1781.
[26] 张波. 变电站接地网频域电磁场数值计算方法研究及其应用[D]. 北京：华北电力大学,2003.
[27] OETTLE E E. A new general estimation curve for predicting the impulse impedance of concentrated earth electrodes[J]. IEEE Transactions on Power Delivery, 1988, 3(4): 2020-2029.