Optimal Design of Grounding Grid for 110 kV Whole-Indoor Intelligent Substation

doi:10.11930/j.issn.1004-9649.201612032

Abstract

Abstract: Because of the small area and high level of ground fault current in today's whole-indoor urban intelligent substation, it is difficult to decrease the grounding resistance and the grounding potential rise, even with the low soil resistivity. Based on a soil model of a 110kV whole-indoor substation, the optimal grounding grid of a whole-indoor intelligent substation 110-A2-X1 is designed. In the process of optimal design, the threshold for grounding potential rise was relaxed appropriately by analyzing the requirements for grounding parameters in design code. The resistance reduction effects of two-layer grounding grid and deep-well grounding electrodes of different numbers and length were investigated with CDEGS software, and the safety and economy of the two resistance reduction measures were compared. The results show that the grounding deep-well has high cost but good resistance reduction effects compared with the two-layer grounding grid. And for unattended 110kV whole-indoor intelligent substation, it is suggested to use six grounding wells each with a depth of 55m for grounding grid o reduce the resistance.

Key words: whole-indoor intelligent substation, two-layer grounding grid, grounding parameters, grounding deep-well, optimal design

CLC Number:

TM835

WANG Ping, JIA Lili, LI Shouxue, LI Kang, LV Fangcheng. Optimal Design of Grounding Grid for 110 kV Whole-Indoor Intelligent Substation[J]. Electric Power, 2018, 51(3): 42-48.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.201612032

https://www.electricpower.com.cn/EN/Y2018/V51/I3/42

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] 沈扬. 变电站接地均压研究[D]. 杭州: 浙江大学, 2008.
[3] 国家电网公司科技部, 国网北京经济技术研究院组. 新一代智能变电站典型设计-110 kV变电站分册[M]. 北京: 中国电力出版社, 2015.
[4] 国家电网公司科技部, 国网北京经济技术研究院组. 新一代智能变电站典型设计-220 kV变电站分册[M]. 北京: 中国电力出版社, 2015.
[5] 曹方圆, 石卫东, 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.
[6] 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.
[7] 高延庆、何金良、曾嵘. 非均匀土壤中变电站接地网优化设计[J]. 清华大学学报(自然科学版), 2002(3), 345-348. GAO Yanqing, HE Jinliang, ZENG Rong, et al. Optimal design of grounding grids of substations in nonuniform soils [J]. Journal of Tsinghua University(Science and Technology), 2002(3), 345-348.
[8] 交流电气装置的接地设计规范: GB/T50065—2011 [S]. 北京: 中国计划出版社, 2011. Code for design of AC electrical installations earthing: GB/T50065—2011 [S]. Beijing: China Planning Press, 2011.
[9] 陈清鹤, 靳小喜. 城市中心区地下变电站接地网设计[J]. 电力与电工, 2013, 33(4): 85-87. CHEN Qinghe, JIN Xiaoxi. Grounding design for underground substations in downtown district[J]. Electric Power and Electrical engineering, 2013, 33(4): 85-87.
[10] 李谦, 杨劲松. 500 kV香山变电站接地网安全性状态评估及整改[J]. 广东电力, 2013, 26(5): 87-92. LI Qian, YANG Jinsong. Safety evaluation and rectification for 500 kV Xiangshan substation grounding grid[J]. Guangdong Electric Power, 2013, 26(5): 87-92.
[11] 赵佃云. 智能变电站运维模式的研究[D]. 济南: 山东大学, 2014
[12] 李谦, 张波. 接地网设计理念及其工程实践[J]. 中国电力, 2014, 47(11): 40-45. LI Qian, ZHANG Bo. Design and engineering practice of substation grounding[J]. Electric Power, 2014, 47(11): 40-45.
[13] 李孟超, 王允平, 李献伟, 等. 智能变电站及技术特点分析[J]. 电力系统保护与控制, 2010, 38(18): 59-62, 79. LI Mengchao, WANG Yunping, LI Xianwei, et al. Smart substation and technical characteristics analysis[J]. Power System Protection and Control, 2010, 38(18): 59-62, 79.
[14] 张云, 张波, 陈伟军, 等. 接地系统地面高阻层的特性[J]. 高电压技术, 2015, 41(5): 1582-1588. ZHANG Yun, ZHANG Bo, CHEN Weijun, et al. Characteristics of surface high-resistance coverings in grounding system[J]. High Voltage Engineering, 2015, 41(5): 1582-1588.
[15] 张婷, 张小亮. 接地网网内压降的仿真分析[J]. 中国电力, 2014, 47(3): 111-115. ZHANG Ting, ZHANG Xiaoliang. Simulation of inner-potential difference of grounding grid[J]. Electric Power, 2014, 47(3): 111-115.
[16] 刘琳, 姜惠兰, 刘琼, 等. 主接地网接地电阻对变电站安全运行的影响[J]. 中国电力, 2007, 40(5): 82-84. LIU Lin, JIANG Huilan, LIU Qiong, et al. Influence of grounding resistance value of main grounding grid on substation safe operation[J]. Electric Power, 2007, 40(5): 82-84.
[17] 电力工程电气设计手册(电气一次部分)[S]. 北京: 中国电力出版社, 1989. Power engineering electric design manual (electricity primary part) [S]. Beijing: China Electric Power Press, 1989.
[18] 李谦. 发电厂和变电站接地网安全性状态评估[M]. 北京: 中国电力出版社, 2013.
[19] 谭波, 杨建军, 鲁海亮, 等. 接地网电位升对10 kV避雷器的反击仿真分析[J]. 高电压技术, 2013, 39(5): 1265-1272. TAN Bo, YANG Jianjun, LU Hailiang, et al. Backflash simulation analysis of ground potential rise on 10 kV arrester[J]. High Voltage Engineering, 2013, 39(5): 1265-1272.