Simulation calculation of impulse grounding resistance of 10 kV distribution line, Part 1: model construction

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 a grounding device is related to many factors such as its structure size, soil resistivity, lightning current parameters and buried depth of the device. Therefore, it is a practical problem to study the calculation method and measurement technology of impulse grounding resistance. In this study, the simulation calculation method of impulse resistance under consideration of soil spark effect is explored, and the calculation formula of each parameter is determined. Then a simulation calculation model for impulse grounding resistance of grounding devices of 10 kV distribution line is constructed using the electromagnetic transient simulation software, and the model is verified to be correct.