变电站地网接地阻抗感性分量影响因素分析

Analysis of inductive component influence factors of grounding impedance of substation grounding grid

随着电力系统容量的不断增大,接地网发生故障时的入地电流也将随之增大。考虑到入地电流实际上是交流电流,此时接地系统上的电位不仅含有阻性分量,而且含有感性分量。传统的接地设计并未考虑接地阻抗中的感性分量。基于此,计算分析了不同地网面积、地网优化、入地电流频率、不同土壤电阻率、不同电流注入点等情况下接地阻抗感性分量的影响。

Along with increasingly large electrical power system capacity, the earth current in grounding grid fault is also increasing. Considered the earth current is alternating current, the potential on the grounding, system is composed of not only the resistant component but also the inductive component, while the traditional earth design docks didn＇t consider the inductive component. To correct this, the influence of different conditions such as grounding grid area, ground network optimization, earth current frequency, electrical resistivity, and different current injection points on inductive component of grounding impedance were calculated and analyzed in this paper.