engleski

Investigation of lightning strikes to wind turbine blades

Lightning discharge is a serious cause of damage to wind turbines. Because of their height, they are exposed to direct lightning strikes which can damage the blades, mechanical parts or the electrical and control systems. According to the lightning protection zone concept, only the external parts are subjected to direct lightning strikes. The internal parts are subjected to indirect effects of lightning, but they are sensible because of their low insulation level. This paper elaborates the wind turbine exposure to lightning strikes and presents the EMTP-RV simulation of a direct strike to a wind turbine blade, identifying the overvoltages at the generator and the low voltage side of the step-up transformer, the ground potential rise and the energy absorbed by the surge protective devices, depending on the grounding resistance.

lightning location system, direct lightning strike, wind turbine, surge protective device

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