The Earthing For Lightning Protection Design At The First Phase Of Wind Turbine In Dong Ma Fang Of Ningwu

In recent years, the wind power industry in china developed rapidly. With the increasing of unit capacity of the wind turbine and wind farm size, the higher wind turbine towers, and often placing wind turbines on the seaside, wilderness and hilltop, etc., lightning has become great natural danger to the safe operation of a wind farm.The CHNG's wind power project in Dong Ma Fang of Ningwu is the key construction project of Shanxi Province and Xinzhou City, listed in the wind power planning of Shanxi Province. The first installed capacity of 49.5 MW. A total of 33 of units of wind turbines with 1500kW. Land area of 11.4876 hectares project approval,33 north-south span of the typhoon motor group, the more dispersed arrangement.in the mountainous areas of North China. The areas are about 2000m above sea level, steep terrain, and the soil resistivity rate is high, the thunder storm activity is frequent. Earthing of Lightning Protection requires the impulse grounding resistance is smaller than 4Ω, which means the engineering design is difficult.This objective for the wind energy field buried, geology, soil, environment, climate, weather and lightning activities, such laws were adequate on-site investigation.In this paper, the danger of lighting to wind turbine is carefully analyzed, and the 33 units of wind turbines are divided into three kinds of ground network marked A, B and C, and based on national norms and standards relevant to design A, B, C are three types of lightning protection and grounding in network design.The design proposal is demonstrated to ensure that the ground network runs steadily and meet the requirement of the project. The design has comprehensive planning, advanced technology, economic rationality, and can ensure the safe operation of CHNG's wind farm of Ningwu in the lightning environment.