双层土壤结构的简化分析  

Simplified analysis on two-layer soil structure

作　　者：高延庆[1] 曾嵘[1] 何金良[1] 梁曦东[1] 

机构地区：[1]清华大学电机工程与应用电子技术系,北京100084

出　　处：《清华大学学报（自然科学版）》2002年第3期349-352,共4页Journal of Tsinghua University(Science and Technology)

摘　　要：针对在接地系统进行简单设计和接地电阻估算时 ,采用多层土壤结构模型进行计算非常复杂的问题 ,论文将多层土壤结构等效为均匀土壤模型 ,提出了双层土壤结构的等效简化方法 ,分析了各个参数对等效均匀土壤电阻率的影响。双层土壤结构对应的等效均匀土壤电阻率只与地网的面积有关 ,而与地网的形状关系不大。接地系统的垂直接地极长度对等效的均匀土壤电阻率有较大的影响 ,影响程度与土壤的反射系数有关。采用等效均匀土壤模型可以对接地网接地电阻进行估算 ,但却不适于对地网的安全性能进行考核 。The multilayer soil structure model can not be easily used to design a grounding system and calculate its grounding resistance. Thereforce, a uniform soil model is needed that is equal to the multilayer soil structure. The simplification method for a two layer soil structure is proposed, and the influence of different parameters on the equivalent soil resistivity is analyzed. The equivalent soil resistivity of a multilayer soil structure depends on the soil parameters, the structure and the size of the grounding systems. The equivalent uniform soil model can be used to estimate the grounding resistance of a grounding system, but it can not be used to analyze the step and touch voltages.

关 键 词：接地系统 变电站 双层土壤结构 

分 类 号：TM63[电气工程—电力系统及自动化] TM862