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1. US20130098651 - Lightning protection structure of blade for wind power generation

注意: このテキストは、OCR 処理によってテキスト化されたものです。法的な用途には PDF 版をご利用ください。

Claims

1. A lightning protection structure of a fiber reinforced plastic blade for wind power generation, comprising:
a blade comprising a blade body formed of fiber reinforced plastic and a tip of the blade body having a shape defined by a lightning receptor formed of conductive material,
an outer surface of the lightning receptor being flush with an outer surface of the blade body;
a surface boundary formed at a boundary between the blade body and the lightning receptor;
the lightning receptor extending from the surface boundary to a distal end of the tip, the lightning receptor having a tapered width and thickness, wherein a width of the lightning receptor becomes smaller in a direction toward the distal end of the tip and a thickness of the lightning receptor becomes smaller in the direction toward the distal end of the tip; and
a lightning receiving protrusion formed of conductive material and configured to protrude outward from the outer surface of the lightning receptor so as to protrude outward from the surface of the blade,
wherein the lightning receiving protrusion is provided at a distance of 10 to 150 mm from the surface boundary in an axial direction of the blade, and
wherein the surface boundary configured to protect against lightning is positioned within a radius of a circle, which is centered on a tip of the lightning receiving protrusion and which has a radius of twice a length of the lightning receiving protrusion.
2. The lightning protection structure of the blade for wind power generation according to claim 1, wherein the lightning receiving protrusion has a cross-sectional area of 5 to 1000 mm 2.
3. The lightning protection structure of the blade for wind power generation according to claim 1, wherein the lightning receiving protrusion is provided at an angle of 45 to 135 degrees to an axial direction of the blade.
4. The lightning protection structure of the blade for wind power generation according to claim 1, wherein in a direction perpendicular to an axial direction of the blade and the tip of the lighting receiving protrusion is positioned, the tip of the lightning receiving protrusion is positioned at an outside across the surface boundary configured to protect against the lightning.
5. The lightning protection structure of the blade for wind power generation according to claim 1, wherein the surface boundary configured to protect against the lightning is positioned at an edge of the lightning receptor in a flattened direction thereof.
6. The lightning protection structure of the blade for wind power generation according to claim 1, wherein the conductive material of the lightning receptor is aluminum.
7. The lightning protection structure of the blade for wind power generation according to claim 1, wherein a ratio (H/L), of the distance (H) of the attached position of the lightning receiving protrusion from the surface boundary to the length (L) of the receiving protrusion, is equal to or less than 1.67.