Research on Discharge Current Distribution inside and outside the Foundation of Transmission Tower

Abstract

It is necessary to inject test current into the tower grounding electrode and distribute multiple back-flow current electrodes inside or outside the tower foundation to form a current loop when measuring the grounding resistance of the tower by Multi-Electrode Method. The distribution of the injection current inside and outside the foundation of transmission tower will be different due to the conducting function of the grounding electrode of the transmission tower by this method, which will lead to the difference among the current of back-flow electrodes and then directly reduce the accuracy of grounding resistance measurement of the tower. In this paper, the distribution of the discharge current inside and outside the transmission tower under different soil conductivity is analysed, and the influence of soil conductivity on the distribution of the spillage current is obtained. This analysis provides a research basis for measuring the grounding resistance by Multi-Electrode Method in transmission tower.