山地多雷区变电站的防雷接地设计方案研究

发布时间：2018-04-14 20:48

本文选题：山地多雷地区 + 高密度电法　；参考：《华北电力大学(北京)》2016年硕士论文

【摘要】：变电站接地系统是保证设备与人身安全,维护电力系统可靠运行的重要设施。随着丽水电力系统电压水平不断提高和系统容量不断增大,接地故障电流不断增大,但发展土地征用越来越困难,变电所面积越来越小,更多的变电所建在山体附近甚至山顶等土壤电阻率高、地质条件复杂的地方。变电所的接地电阻、跨步电压、接触电压往往无法达到安全运行的要求,生产运行部门对于降低地网接地电阻、接触电压和跨步电压,保障电力系统安全、可靠运行的呼声越来越高。本次研究将高密度电法和CDEGS软件有效结合,对变电所进行安全性计算分析,在不满足条件的新建变电站提出解决方案。采用高密度电法对所址及其周边土壤电阻率进行测量,并反演得到较为准确直观的土壤电阻率分布情况；通过数学统计及CDEGS软件的RESAP模块,将高密度电法反演得到的土壤分布图转化为较为准确且能用于CDEGS软件的MALZ模块仿真计算的土壤模型。从数值和经济性上分析每种改进方式的优缺点。在实际施工过程中证明了将高密度电法和CDEGS软件结合应用在变电所接地运行的安全性计算是成功的,对丽水山地多雷区变电站的接地方案提出了具有参考性的意见。
[Abstract]:The substation grounding system is to ensure that the equipment and personal safety, maintenance facilities and reliable operation of power system. As the voltage level of Lishui power system and constantly improve the system capacity increasing, the fault current is increasing, but the development of land expropriation has become increasingly difficult, substation area is more and more small, more built substation in the mountains near the top, even the high soil resistivity, complex geological conditions. The grounding resistance, step voltage substation, contact voltage are often unable to meet the requirements of safety operation, production and operation departments to reduce the grounding resistance, contact voltage and step voltage, ensure the security of the power system, more and more reliable operation high. This study combines the high density resistivity method and CDEGS software, the safety of the substation calculation and analysis, put forward the solution in the new substation does not meet the conditions. Measurement of the site and its surrounding soil resistivity using high density resistivity method, and obtained the soil resistivity distribution more accurately; through the RESAP module of CDEGS software and mathematical statistics, the high density resistivity inversion of soil distribution map into a more accurate and can be used to calculate soil model MALZ simulation software CDEGS. Analysis of the advantages and disadvantages of each improvement pattern from the numerical and economy. In the actual construction process proved that the high density resistivity method and CDEGS software combined with the safety of the application of grounding operation in substation is calculated successfully, the grounding scheme of substation of Lishui mountain area is proposed with reference opinions.

【学位授予单位】：华北电力大学(北京)
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TM862;TM63

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