Wind turbine blade lightning protection structure and wind turbine blade

Abstract

The invention provides a wind turbine blade lightning protection structure and a wind turbine blade, and belongs to the technical field of wind turbine blade lightning protection. The wind turbine blade lightning protection structure comprises a metal blade tip and a metal probe, wherein the metal blade tip is arranged at the tip part of the blade and is electrically connected with a grounding wire in the blade; and the metal probe is arranged on the blade by being spaced from the metal blade tip and is electrically connected with the metal blade tip through a connecting wire. According to thewind turbine blade lightning protection structure, the metal probe, the connecting wire, the metal blade tip and the grounding wire form a discharge path, and under the action of a lightning strike descending pilot strong electric field, the metal probe which is closer to lightning starts the ascending pilot with a higher probability than the grounding wire to form a discharge path with the descending pilot. Therefore, the possibility that the induced charge around the grounding wire form flow column discharge and further forms the ascending pilot to break down the blade is effectively reduced, and the safety of the blade in a lightning strie environment can be effectively ensured

Description

technical field [0001] The invention relates to the technical field of lightning strike protection for wind turbine blades, in particular to a lightning protection structure for a wind turbine blade and the wind turbine blade. Background technique [0002] With the rapid development of the economy, people's demand for electric energy continues to increase, and the capacity of wind turbines and the scale of wind power generation also continue to expand. Due to the high and protruding body structure of wind turbines, they are often located in wilderness or mountainous areas, and lightning strikes are one of the main factors affecting the safe operation of wind turbines. The blades are the most vulnerable components of the entire generator set to be struck by lightning. Therefore, the lightning strike protection of wind turbine blades has become a key issue restricting the reliable operation of wind turbines. [0003] Chinese patent document CN102869882A discloses a wind turbi...

AI Technical Summary

Problems solved by technology

The charge accumulated on the ground lead further forms an upward leader, which forms a discharge path with the lightning strike downward leader. Since the ground lead is located inside the blade, the discharge path formed by the streamer discharge and the lightning strike downward leader is easy to break down the blade, and a large number of high-temperature lightning strikes The arc merges into the breakdown position, which may easily cause lightning damage to the blade

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