Lightning protection system of wind power blade

Abstract

The invention discloses a lightning protection system of a wind power blade. The lightning protection system of the wind power blade comprises a metal net I used for conducting thunder and lightning and fixed on the two surfaces of a wind power blade shell, an laying area of each surface of the metal net I is basically matched with a main beam, the end, close to the root of the blade, of the metalnet I is connected with a ground lead so as to conduct the thunder and lightning to the ground, a plurality of metal nets II are arranged on the metal net I in a lap joint mode at intervals, lightning conductors used for conducting the thunder and lightning are arranged at the end, far away from the metal net I, of the metal net II, and the end, extending into the shell, of the lightning conductors is connected with a main cable line through a branch cable to realize conduction of the metal net I and the main cable line; and the tip part of the wind power blade is provided with a pointed partlightning arrester, the main cable line is correspondingly connected with the pointed part lightning arrester and the ground lead so as to conduct the thunder and lightning to the ground through theground lead. The lightning protection system can carry out diversion of the double-guide flow channel of the metal net I and the main cable line after being subjected to lightning, the problem that the whole failure of the lightning protection system caused by breakage of lightning stroke of the metal net I is avoided, and the operation safety of the blade can be guaranteed more comprehensively.

Description

technical field [0001] The invention relates to the field of lightning protection for wind power blades, in particular to a lightning protection system for wind power blades. Background technique [0002] In recent years, with the increase in the size of wind turbines and the increasing number of offshore applications, high-strength, high-modulus carbon fiber main beams are widely used in wind turbine blades. Compared with the glass fiber main beam, the wind turbine blades are more likely to be struck by lightning because of the conductivity of carbon fiber, but its conductivity is extremely poor, and it cannot conduct lightning quickly after being struck by lightning, so more serious damage will occur. Repair costs are huge. [0003] In the prior art, the lightning protection method for carbon fiber main beam wind power blades is usually to lay metal mesh on the outer layer of the blade from the tip to the root as a whole. However, this method has the following problems: (...

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Problems solved by technology

[0005] In view of this, the purpose of the present invention is to provide a lightning protection system for wind turbine blades, which aims to solve the problem in the prior art that the metal mesh laid on the tip section is easily damaged by lightning strikes, and the metal mesh cannot conduct electricity due to the overall fracture after being struck by lightning. The problem that the lightning protection system fails due to current

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