发电厂接地网土壤模型构建及其安全性评估

利用CDEGS软件对内蒙古地区某电厂接地网所处地区的土壤进行建模计算，分析了接地网的安全性。由于该电厂处于我国北方严寒地区，春冬季受地表覆盖冰雪的影响，土壤电阻率与夏秋季节差异较大，因此构建了冻土环境下的接地网仿真模型。结合当地气象条件，利用接地阻抗、接触电压和跨步电压等电气量分析全年不同季节土壤条件下接地网的安全性。分析结果表明：借助接地电阻值的实际测量值，利用CDEGS软件进行模拟，可有效弥补由现场测量中土壤电阻率信息不全所带来的深层土壤模型构建的缺陷；在内蒙古地区，冻土模型的引入是实现接地网综合评估不可或缺的环节。

Ground Soil Model Building and Its Safety Assessment on Power Plant Grounding Grid

Building a model to calculate the soil of the grounding grid area of a power plant in Inner Mongolia by CDEGS software, analysis the safety of grounding grid. It is important to build a grounding grid simulation model under the permafrost environment, because the influence of snow-covered surface in spring and winter in northern China cold area, soil resistivity is quite different from summer and autumn. The safety status of grounding grid for a power plant was evaluated by electrical quantities, such as, grounding resistance, contact voltage and step voltage in frozen soil environment, which should be combined with local meteorological conditions. This research showed that： the defects of deep soil model construction caused by the incomplete information of soil resistivity in the in-situ measurement, which could be effectively compensated values of grounding resistance by the actual measured; Believed that the permafrost model was an indispensable step to achieve the comprehensive assessment of grounding grid in Inner Mongolia.