发、变电站接地网安全性能分析

Safety Analysis of Grounding Grid for Substations with Different Structure

对发、变电站地表的接触、跨步电压和地网导体根数（导体长度）及地网导体排列方式的关系进行详细论述。根据文中提出的规律，可指导我们对不同面积地网进行合理设计，确定合理的导体根数，使导体上的泄漏电流密度更均匀，并由此显著地减小地网接地电阻及地表面的电位梯度和最大接触、跨步电压，从而有效、充分地利用接地网材料，实现地网的安全、经济设计。

In this paper the influences of the grounding conductor number for a ground system in different designs on the touch and step voltage on the earth＇s surface are analyzed in detail． The result of this study can be used to determine the rational numbers of grounding conductors which can equalize the leakage current density and decrease touch voltage and step voltage on the earth＇s surface markedly． Therefore the designers can design the grounding system for substations and power plants safely and economically． The same analysis is also performed with the unequally spaced grounding grid where the grid conductor spacing increases progressively from the periphery to the center instead of an equally spaced grounding grid．