深井接地极在变电站接地网中的应用分析

Application Analysis of Deep Well Grounding Electrode in Substation Grounding Grid

传统的水平接地网由于面积受限难以满足接地网的安全性日益提高的要求,离子接地深井这种降阻措施被逐步应用到接地网的降阻中。以典型的高土壤电阻率站址220 k V变电站设计为例,结合现场实测和仿真计算,计算不同深井接地参数下接地网性能的特性参数,仿真结果表明,离子接地深井降阻措施起到的效果比较有限,在变电站接地网设计中,不推荐使用该降阻措施。

The traditional horizontal grounding grid is difficult to meet the increasing safety requirements of the grounding grid due to the limited area,so that the ion-grounded deep wells are gradually applied to the resistance reduction of the grounding grid.Taking the typical design of 220kV substation in high soil resistivity site as an example and combining with the field measurement and simulation calculation,this paper calculated the characteristic parameters of grounding grid performance under different grounding parameters of deep wells.The simulation results show that the measurement of ion-grounded deep wells resistance reduction has limited effectiveness,which is not recommended in the design of transformer substation grounding grid.