Simulation calculation of impulse grounding resistance of 10 kV distribution line, Part 2: research on influencing factors

摘要

The reliable grounding of equipment in the power system is the key to ensuring the safe operation of equipment. The grounding resistance of grounding devices, especially the impulse grounding resistance, determines the overvoltage protection of equipment and the lightning protection of transmission and distribution lines. The impulse grounding resistance of grounding devices is related to many factors such as their structure size, soil resistivity, lightning current parameters and buried depth of the devices. Therefore, it is a practical problem to study the calculation method and measurement technology of impulse grounding resistance. In this paper, the impacts of soil resistivity, lightning current amplitude, wave-front time of lightning current, and other factors on the impulse grounding resistance of grounding bodies are analyzed by the simulation calculation model of impulse resistance, with the goal of providing a reference for the design of grounding devices of 10kV distribution line towers.