Analysis of Lightning Overvoltage Base on Grounding Method of Lightning Arresters in Wind Farm

摘要

This study simulates lightning strikes and a wind farm using the simulation tool EMTP-RV and analyses the effects of lightning overvoltage. It compares the lightning overvoltage for two grounding methods of lightning arresters-common ground and connected ground. For the simulations, the ground impedance of the lightning arrester is selected according to the earth resistivity and lightning frequency. The study also analyses the resulting magnitude of the overvoltage when corona is the lightning strikes. Thereby, it suggests a method of reducing the lightning overvoltage through various simulations, depicting various conditions such as the change of ground impedance and the grounding method of the lightning arrester.