The Potential Difference Characteristics between Two Points on Grounding Grid of Substation

doi:10.11930/j.issn.1004-9649.201907046

Abstract

Abstract: With the intelligentization upgrade of power substations, a large number of secondary equipment are deployed dispersedly nearby the high-voltage primary equipment. The enclosures of these secondary devices are electrically connected to the grounding grid underground. When a fault current injection causes the potential rise in the grounding grid, there is a potential difference between any two points on the grounding grid conductors. For two secondary equipment located at different positions and connected by secondary cable, the potential difference can induce common-mode and differential-mode disturbance voltages at the ports of the secondary cable, which may interfere the normal operation of secondary system. In this paper, the grounding grid of a 220 kV substation is modelled and the corresponding potential difference is calculated by using the CDEGS software. Also, the effects of the grid density and size, soil resistivity, the positions of current injection and potential observation on the potential difference are investigated. The results are helpful for guiding grounding grid design and evaluating the influence of ground potential difference on secondary equipment.

Key words: CDEGS, power substation, grounding grid, ground potential difference, overvoltage protection and grounding

WANG Yonghong, JIAO Chongqing, XIAO Bing, GUO Anqi, QIU Guizhong, BI Lipeng, XU Keqiang. The Potential Difference Characteristics between Two Points on Grounding Grid of Substation[J]. Electric Power, 2021, 54(1): 150-158.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.201907046

https://www.electricpower.com.cn/EN/Y2021/V54/I1/150

References

[1] 田松, 鲁海亮, 文习山, 等. 安全性分析在变电站接地网设计中的应用[J]. 高压电器, 2014, 50(7): 44-50, 56
TIAN Song, LU Hailiang, WEN Xishan, et al. Security analysis in the design of the substation grounding grid[J]. High Voltage Apparatus, 2014, 50(7): 44-50, 56
[2] 郭名文, 樊艳芳, 耿山, 等. 特高压直流接地极周边断裂结构对地表电位分布的影响研究[J]. 电力系统保护与控制, 2019, 47(2): 73–79.
GUO Mingwen, FAN Yanfang, GENG Shan, et al. Study on the effect of fracture structure adjacent to ground electrodes of UHVDC power transmission lines on earth surface potential distribution[J]. Power System Protection and Control, 2019, 47(2): 73–79.
[3] 曹晓斌, 胡劲松, 余波, 等. 一类垂直双层土壤中地网接地电阻的简易计算公式[J]. 中国电机工程学报, 2009, 29(1): 120-126
CAO Xiaobin, HU Jinsong, YU Bo, et al. a simplified formula for grounding grids resistance in a type of vertical two-layer soil[J]. Proceedings of the CSEE, 2009, 29(1): 120-126
[4] 罗琛, 马力, 詹旻, 等. 季节性冻土对变电站接地安全参数的影响[J]. 中国电力, 2018, 51(6): 89-95
LUO Chen, MA Li, ZHAN Min, et al. Analysis of the influence of seasonal frozen soil on the grounding safety parameters of substation[J]. Electric Power, 2018, 51(6): 89-95
[5] 李瑞庆, 惠贵兴, 阮江军, 等. 变电站接地短路对附近电位分布影响的计算[J]. 高电压技术, 2005, 31(5): 67-68
LI Ruiqing, HUI Guixing, RUAN Jiangjun, et al. Calculation of electric potential distribution around the substation during grounding faults[J]. High Voltage Engineering, 2005, 31(5): 67-68
[6] 刘渝根, 陈超. 基于人工蜂群算法优化支持向量机的接地网腐蚀速率预测模型[J]. 电力自动化设备, 2019, 39(5): 182-186, 200
LIU Yugen, CHEN Chao. Corrosion rate prediction model of grounding grid based on support vector machine optimized by artificial bee colony algorithm[J]. Electric Power Automation Equipment, 2019, 39(5): 182-186, 200
[7] 王红坡, 吴涛, 刘利强. 新建500kV变电站的接地网设计[J]. 内蒙古工业大学学报(自然科学版), 2017, 36(1): 30-37
WANG Hongpo, WU Tao, LIU Liqiang. The design of the new 500 kV substation grounding grid[J]. Journal of Inner Mongolia University of Technology (Natural Science Edition), 2017, 36(1): 30-37
[8] 黄一凡, 周宏威, 卢延飞, 等. 高纬度寒区变电站接地网设计优化研究[J]. 电气应用, 2018, 37(14): 12-16
HUANG Yifan, ZHOU Hongwei, LU Yanfei, et al. Design optimization of substation grounding grid in high latitude cold region[J]. Electrotechnical Application, 2018, 37(14): 12-16
[9] 高延庆, 何金良, 曾嵘. 发、变电站接地网安全性能分析[J]. 中国电力, 2001, 34(5): 33-36
GAO Yanqing, HE Jinliang, ZENG Rong. Safety analysis of grounding grid for substations with different structure[J]. Electric Power, 2001, 34(5): 33-36
[10] DONG X Z, CHINA T U B, WANG D L, et al. Smart power substation development in China[J]. CSEE Journal of Power and Energy Systems, 2016, 2(4): 1-5.
[11] 王平, 贾立莉, 李守学, 等. 110kV全户内智能变电站接地网优化设计[J]. 中国电力, 2018, 51(3): 42-48
WANG Ping, JIA Lili, LI Shouxue, et al. Optimal design of grounding grid for 110 kV whole-indoor intelligent substation[J]. Electric Power, 2018, 51(3): 42-48
[12] ZHANG B, JIANG Y K, WU J P, et al. Influence of potential difference within large grounding grid on fault current Division factor[J]. IEEE Transactions on Power Delivery, 2014, 29(4): 1752-1759.
[13] 曹方圆, 时卫东, 康鹏, 等. 接地材料对杆塔接地装置冲击接地阻抗的影响[J]. 中国电力, 2016, 49(10): 67-73
CAO Fangyuan, SHI Weidong, KANG Peng, et al. Influence of ground material on the impulse ground impedance of tower's grounding devices[J]. Electric Power, 2016, 49(10): 67-73
[14] 杨剑, 潘文霞, 孙宏航. 考虑地表高阻层的直流接地极跨步电压限值计算方法[J]. 中国电力, 2017, 50(2): 150-156
YANG Jian, PAN Wenxia, SUN Honghang. Research on calculation method for step voltage limitation of DC grounding electrode based on surface high-resistance covering[J]. Electric Power, 2017, 50(2): 150-156
[15] LI Z, WANG S, GUO F, et al. Study on characteristics of grounding impedance of large grounding grid[C]//IEEE International Conference on Environment & Electrical Engineering & IEEE Industrial & Commercial Power Systems Europe. IEEE, 2017.
[16] HE J L, ZHANG B, ZENG R. Maximum limit of allowable ground potential rise of substation grounding system[J]. IEEE Transactions on Industry Applications, 2015, 51(6): 5010-5016.
[17] 鲁志伟, 常树生, 张久禄. 大型变电站接地网的网内电位差[J]. 电力建设, 2004, 25(9): 39-40
LU Zhiwei, CHANG Shusheng, ZHANG Jiulu. Potential difference within grounding net for large substations[J]. Electric Power Construction, 2004, 25(9): 39-40
[18] 鲁志伟, 文习山, 史艳玲, 等. 大型变电站接地网工频接地参数的数值计算[J]. 中国电机工程学报, 2003, 23(12): 89-93
LU Zhiwei, WEN Xishan, SHI Yanling, et al. Numerical calculation of large substation grounding grids in industry frequency[J]. Proceedings of the CSEE, 2003, 23(12): 89-93
[19] 端木林楠, 赵习静, 周小明, 等. 基于CDEGS的接地网分流系数仿真与实测分析[J]. 高压电器, 2016, 52(1): 154-161
DUANMU Linnan, ZHAO Xijing, ZHOU Xiaoming, et al. Analysis of the experiment and simulation based on CDEGS of the shunt current coefficient of the grounding grid[J]. High Voltage Apparatus, 2016, 52(1): 154-161
[20] 豆朋, 陆培钧, 屈勇, 等. 利用CDEGS软件比较分析铜和钢接地网的性能[J]. 高电压技术, 2007, 33(12): 217-219
DOU Peng, LU Peijun, QU Yong, et al. Comparative analysis the property of copper and copper grounding grid using CDEGS[J]. High Voltage Engineering, 2007, 33(12): 217-219