Lightning protection device of windmill blade

Abstract

The present invention proposes a lightning protection device of a windmill blade, comprising a tip receptor assembly having receptors which are mounted, in particular to, the tip end part of the blade where the blade profile becomes smaller, and having a simple structure so as to be readily assembled, and an intermediate receptor assembly having a receptor which is set at the outer surface of the blade so as to exhibit an effective countermeasure against increasing of the air pressure in the blade upon a lightning striking upon the blade, a lightening current being discharged to the ground from the receptors through connection equipment such as lead wires laid through the inside of the blade the windmill body and bypass brushes, characterized in that a base plate made of an electrically conductive material and connected thereto with the lead wires is embedded in the blade, and the receptors are secured and supported to the base plate, being exposed at the outer surface of the blade. Further, the present invention also proposes a method of assembling the lightning protection device.

Description

Technical field [0001] The present invention relates to a lightning protection device for windmill blades and a method for assembling the lightning protection device. The lightning protection device includes: a lightning receiver connected to the outer surface of the blade, and lightning current is passed from the receiver through, for example, laying It is released to the ground through connecting devices such as conductors inside the wind turbine blades; and the wind turbine body part or bypass brush. Background technique [0002] As a measure to prevent the turbine blades of the windmill or the entire windmill device from being struck by lightning, for example, Patent Literature 1 (PCT-WO2004 / 111686A1) or Patent Literature 2 (PCT-WO2005 / 026538A1) proposes a lightning protection device, It includes: a lightning receiver connected to the outer surface of the blade, and the lightning current caused by the lightning hitting the receiver is guided from the outer surface to the grou...

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Problems solved by technology

[0005] However, although the technique disclosed in Patent Document 1 relates to a structure in which lightning current from a lightning receiver (the lightning receiver runs from the tip of the blade along the blade The length direction of the blade is arranged at several positions), and although the technology disclosed in Patent Document 2 involves lightning receivers exposed on the ventral shell of the blade and the back shell of the blade to allow lightning to strike the lightning receiver At the same time, the receiver is fixed to the rear surface of the ventral shell and the structure of the dorsal shell respectively by screws, but neither of the two patent documents discloses a method for assembling the receiver to a blade with a smaller airfoil profile. Effective measures at the tip portion, countermeasures against pressure increase caused in the inner side of the blade when lightning strikes the blade, etc.

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