Wind turbines protection against the lightning struck using a combined method

Protection is a crucial function which has been considered for many years. Lightning is one of the natural phenomena that can heavily damage the turbine and its equipments; wind turbines are often struck by lightning because of their special shape, their tall structure and their being placed in the open air. The purpose of this paper is about protecting Wind Turbines (even Small Wind Turbines) against Lightning by introducing a combination of various methods, which have been invented or established, such as different designs and materials of blades, Two Ring-Shaped Electrodes and using a choke on the shaft. Then, we can understand which way can be more practical for turbines to withstand lightning.