大型变电站钢材和铜材接地网的性能比较

Performance Comparison of Copper and Steel Material Grounding Grids of Large Substation

基于场路结合的思想 ,考虑导体自感和导体间互感 ,用传统的节点电压法分析接地网。计算实际大型变电站接地网的结果与著名软件包CDEGS的计算相吻合。分析比较了大型铜材和钢材接地网接地阻抗、最大跨步和接触电势系数等方面的性能差异 ,并阐述了产生差异的原因 。

This paper analyses grounding grids by traditional nodal voltage method based on field-circuit coupling theory, considering self-inductance of conductors and mutual-inductance. This paper computes real large substation. The results accord with famous soft package CDEGS's. By comparing and analyzing the performance difference of grounding grids, maximal step and touch voltage coefficient of large copper and steel material grounding grids, and formulating the reason of these difference, this paper draws some useful conclusion.