基于CDEGS软件的高土壤电阻率地区主变电所接地网设计
曹建设
Design of Grounding Grid for Main Substations in High Soil Resistivity Areas Based on CDEGS Software
CAO Jianshe
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作者信息:轨道交通工程信息化国家重点实验室(中铁一院)，710043，西安
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Affiliation:State Key Laboratory of Rail Transit Engineering Informatization (FSDI), 710043, Xi’an, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2024.07.056
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中图分类号/CLCN:U231.8
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栏目/Col:应用技术
摘要:
［目的］为解决高土壤电阻率地区主变电所接地电阻难以降低的问题，有必要对高土壤电阻率地区主变电所的接地网设计进行研究。［方法］结合该主变电所的地理位置条件及土壤电阻率特点，通过单一变量法确定了水平接地体的合理数量；基于CDEGS仿真软件分析了水平接地体按指数非均匀布置时，接触电势、跨步电压及接地电阻的改善效果；提出了降低接地电阻的优化措施。［结果及结论］当水平接地网导体数量增加到一定程度后，导体的边际效应会大幅下降；垂直接地极对降低该主变电所的接地电阻作用不大，设计中不建议采用；采用深井接地极后，主变电所的接触电势、跨步电压均大幅降低，接地电阻也降至0.5Ω以下，均满足规范要求。
Abstracts:
［Objective］ To address the difficulty of reducing the grounding resistance of main substations in high soil resistivity areas, it is necessary to study the design of grounding grids for main substations in such regions. ［Method］ Combining the geographical location conditions and soil resistivity characteristics of the main substation, a reasonable quantity of horizontal grounding conductors is determined using single-variable method. The improvement effects of contact potential, step voltage, and grounding resistance are analyzed using CDEGS simulation software when horizontal grounding conductors are arranged in exponential non-uniform distribution. Optimization measures to reduce grounding resistance are proposed. ［Result & Conclusion］ After increasing the quantity of horizontal grounding grid conductors to a certain extent, the marginal effect of the conductors decreases significantly. The vertical grounding electrode has little effect on reducing the grounding resistance of the main substation and is not recommended for use in the design. With the use of deep well grounding electrodes, both the contact potential and step voltage of the main substation are significantly reduced, and the grounding resistance is reduced to below 0.5 Ω, meeting the requirements in related specifications.
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