Frequency Dependence of Grounding Impedances in Lightning Protection System

초록

Abstract: This paper presents a systematic approach of measurement and analysis of grounding system impedances for lightning protection in high technology branches or intelligent building. A novel method for measuring the grounding impedance as a function of frequency was proposed. The measurement device consists of a V/F inverter, data acquisition and processing unit and probe systems. Computations were made by using the equivalent circuit approach based on the resistivity and dielectric constant of the soil and the inductance of grounding electrodes. Frequency dependence of grounding system impedance was mainly caused by the inductive current flowing through grounding conductors over the frequency of some tens kHz.