引外接地对降低接地网接地阻抗的作用

Grounding Impedance Analysis of Grounding Grids Connected With Buried Conductors

采用接地网工频接地参数分析软件,计算了引外接地网对降低主接地网接地阻抗的作用。计算结果表明,随着辅助接地网与主接地网之间的距离的增加,辅助接地网的作用逐渐减小;并且在土壤电阻率较高的地区,引外接地具有较好的降低主接地网接地阻抗的作用。

The grounding impedance of grounding grids connected with buried conductors is calculated based on numerical calculation of large substation grounding grids in power frequency. The results show that the function of subsidiary grounding grids becomes smaller as the distance between two grounding grids becomes longer. The grounding impedance can be effectively reduced by subsidiary grids in high resistivity regions.