Wind turbine blade tip lightning protection device

Abstract

The invention relates to a wind driven generator blade point lightning protection device which comprises a metal protective sleeve mounted at a wind driven generator blade point part, and a lightning receptor conductively connected with the metal protective sleeve, wherein the lightning receptor is provided with an external contactor; the external contactor is in screw assembly and conductive connection with an internal contactor mounted inside a blade; the lightning receptor is conductively connected with the metal protective sleeve through the external contactor arranged in a first through hole in a penetrating manner; the metal protective sleeve is tightly connected with the blade point part through a fastener arranged in a second through hole in a penetrating manner; the fastener comprises two bolts and a casing pipe; and a lightning arrester device is mounted at the blind end of the metal protective sleeve. The wind driven generator blade point lightning protection device has the advantages that the lightning conducting effect is ideal, the damage, caused by thunder and lightning, of the wind driven generator blade point part can be effectively avoided and reduced, the mounting is firm and reliable, the service life is long, the safety is good, and the device is particularly suitable for being matched with a conventional wind driven generator blade for use.

Description

technical field [0001] The invention relates to a lightning protection device for a wind power generator, in particular to a lightning protection device for a blade tip of a wind power generator. Background technique [0002] Wind turbines are generally installed on high ground in the wild, and the blades of the wind turbines are extremely vulnerable to lightning strikes. At present, the general lightning protection technology focuses on how to quickly introduce lightning current into the ground when struck by lightning, minimize the current from lightning into the equipment, maximize the safety of equipment and personnel, and minimize the loss . In the design, it is mainly composed of the blade lightning receptor, the lightning guide channel inside the blade, and the grounding channel of the whole machine. With the increase of the single unit capacity of wind turbines, the length of the blades is also increasing, and some blades can reach more than 150 meters. In addition...

AI Technical Summary

Problems solved by technology

At present, most manufacturers increase the number of lightning receptors on the blade, or arrange multiple lightning receptors on the entire blade, hoping to solve the problem of lightning protection at the blade tip. However, due to the limitation of the blade structure, there is a certain distance between the installation position of the lightning receptor and the blade tip. , after the tip of the blade is struck by lightning, it cannot be effectively and quickly transmitted to the lightning protection channel, and the tip of the blade will be injured or destroyed in an instant. If a lightning rod is added to the tip of the blade alone, it is also limited by the structure of the tip of the blade. The laying of the blades requires a major modification of the blade structure, and because the blade itself is a high-speed rotating part, the service life and safety of the lightning protection components are poor

In addition, some lightning protection designs have also appeared in some technical documents, such as installing conductive caps on the tip of the blade, etc., but there are still poor conductive effects, and the fastening method between the conductive cap and the blade has a certain impact on the blade structure and working conditions And the degree of firmness cannot effectively meet the requirements of use, the conductive cap is heavy, poor in safety, high in cost, inconvenient for installation and maintenance, and many technical problems such as unreasonable individual designs

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