| 引用本文: | 马成廉,姚新岳,宋萌清,等.计及高频雷电流下变电站接地网对周边燃气管网系统及新建地网系统阻性耦合影响分析[J].电力系统保护与控制,2025,53(9):166-175. |
| MA Chenglian,YAO Xinyue,SONG Mengqing,et al.Analysis of the impact of substation grounding network on the resistive coupling of the surrounding gas pipeline system and the newly built grounding system under high frequency lightning currents[J].Power System Protection and Control,2025,53(9):166-175 |
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| 摘要: |
| 针对电网中部分变电站面临的老旧接地网改造升级及周边管网系统安全防护问题，在工频接地网分析的基础上，以实际500 kV变电站新建接地网改造工程及220 kV变电站接地网管道杂散电流干扰防护工程为例进行分析。在应用ETAP Power Station及CDEGS实际测算的4层土壤模型基础上，结合CDEGS接地网仿真软件搭建了新旧地网以及周边金属管道的实际模型。对比分析工频及高频电流下对接地网及其周边构筑的阻性耦合影响，集中考虑雷电流相较于工频短路电流作用于变电站接地网及周边管网系统时的异同点，发现变电站接地网在高频雷电流排泄散流过程中的薄弱环节。结果表明，高频雷电流作用时，会导致电流入地点处地电位急剧升高，并且入地电流幅值逐级衰减很快，对接地网边缘处地电位升影响不大。变电站周边存在金属管道时，由于瞬时电压的升高，极易造成管道绝缘层的局部放电，导致燃气管道绝缘层电位骤降，造成击穿。 |
| 关键词: 变电站 接地网 埋地金属管道 雷击 阻性耦合 |
| DOI：10.19783/j.cnki.pspc.240846 |
| 分类号: |
| 基金项目:国家重点研发计划项目资助(2022YFB2403000)；吉林省教育厅科学技术研究项目资助(JJKH20230117KJ) |
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| Analysis of the impact of substation grounding network on the resistive coupling of the surrounding gas pipeline system and the newly built grounding system under high frequency lightning currents |
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MA Chenglian1, YAO Xinyue1, SONG Mengqing1, LIU Chunming2, YANG Mao1, SUN Li1
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1. Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology, Ministry of Education(Northeast Electric Power University), Jilin 132012, China; 2. State Key Laboratory of Alternate Electrical Power Systemwith Renewable Energy Sources (North China Electric Power University), Beijing 102206, China
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| Abstract: |
| Based on the analysis of the power frequency grounding network, this paper focuses on the upgrading of the old grounding networks in some substations and the safety protection of the surrounding pipeline systems in the power grid, taking a 500 kV substation’s new grounding network renovation project and a 220 kV substation’s grounding network pipeline stray current interference protection project as examples. Based on the four-layer soil model calculated using ETAP Power Station and CDEGS, combined with the CDEGS grounding network simulation software, actual models of the new and old grounding networks and surrounding metal pipelines are built. The resistive coupling effects on the grounding networks and its surrounding structures under power frequency and high-frequency currents are compared and analyzed. This paper specifically examines the similarities and differences between the effects of lightning currents and power frequency short-circuit currents on substation grounding networks and surrounding pipeline systems, identifying weak points in the discharge and dispersion process of high-frequency lightning currents. The results show that high-frequency lightning currents cause a sharp increase in the ground potential at the current injection point, with a rapid stepwise decaying of current amplitude, resulting in minimal impact on the ground potential at the edge of the grounding network. When metal pipelines exist around the substation, the sudden rise in transient voltage can easily cause partial discharge in the pipeline insulation layer, leading to a sudden drop in the potential of the gas pipeline insulation layer and resulting in breakdown. |
| Key words: substation grounding network buried metal pipeline lightning strike resistive coupling |
