变电站接地网上两点间电位差的特性

doi:10.11930/j.issn.1004-9649.201907046

中国电力 ›› 2021, Vol. 54 ›› Issue (1): 150-158.DOI: 10.11930/j.issn.1004-9649.201907046

变电站接地网上两点间电位差的特性

王永红¹, 焦重庆², 肖冰¹, 郭安琪², 邱桂中¹, 秘立鹏¹, 徐克强³

1. 国网内蒙古东部电力有限公司电力科学研究院，内蒙古呼和浩特 010020;
2. 华北电力大学新能源电力系统国家重点实验室，北京 102206;
3. 南京恒经通电子科技有限公司，江苏南京 210000

收稿日期:2019-07-05 修回日期:2019-08-22 出版日期:2021-01-05 发布日期:2021-01-11
作者简介:王永红(1963—)，男，博士，高级工程师(教授级)，从事电化学工程、环境工程研究，E-mail: wyh88188@sina.com;郭安琪(1994—)，女，硕士研究生，从事电力系统电磁兼容研究，E-mail: guoanqi1006@qq.com
基金资助:
国家自然科学基金资助项目(51307055)。

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

WANG Yonghong¹, JIAO Chongqing², XIAO Bing¹, GUO Anqi², QIU Guizhong¹, BI Lipeng¹, XU Keqiang³

1. State Grid Inner Mongolia East Electric Power Co., Ltd. Power Science Research Institute, Hohhot 010020, China;
2. State Key Laboratory of Alternate Electric Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, China;
3. Hengjingtong Electronic Technology Co., Ltd., Nanjing 210000, China

Received:2019-07-05 Revised:2019-08-22 Online:2021-01-05 Published:2021-01-11
Supported by:
This work is supported by National Natural Science Foundation of China (No.51307055)

摘要/Abstract

摘要： 随着变电站的智能化发展，大量二次设备分布式布置于高压一次设备附近。这些二次设备的外壳就地与接地网连接。当故障电流注入接地网导致地电位升时，在接地网上两点之间存在电位差。对于2个由二次电缆连接的二次设备，该电位差可以在二次电缆端口感应共模和差模骚扰电压，严重时影响到二次系统的正常稳定运行。针对某220 kV变电站接地网，计算分析了地电位差随地网尺寸和网格大小、土壤电阻率、故障电流注入点位置、观测点位置的变化规律。研究成果对于指导的接地网设计、地电位差对二次设备的影响评估评估有参考价值。

关键词: CDEGS, 变电站, 接地网, 地电位差, 过电压保护与接地

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

王永红, 焦重庆, 肖冰, 郭安琪, 邱桂中, 秘立鹏, 徐克强. 变电站接地网上两点间电位差的特性[J]. 中国电力, 2021, 54(1): 150-158.

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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变电站接地网上两点间电位差的特性

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

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变电站接地网上两点间电位差的特性

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

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