WIND TURBINE BLADE WITH A LIGHTNING PROTECTION SYSTEM
First Claim
1. A wind turbine blade with a lightning protection system (1, 51, 101, 201), wherein the blade (1, 51, 101, 201) comprises a shell body made of a composite material and comprises a longitudinal direction with a root end and a tip end, the blade further comprising a profiled contour including a pressure side and a suction side, as well as a leading edge and a trailing edge with a chord having a chord length extending there between, the profiled contour, when being impacted by an incident airflow, generating a lift, and wherein the lightning protection system comprises:
- at least one lightning receptor (3, 53, 103, 203) arranged freely accessible in or on a surface of the shell body surface, anda lightning down conductor (2, 52, 102, 202) made of or comprising an electrically conductive material and extending within the shell body from the lightning receptor (3, 53, 103, 203) to the root end of the blade (1, 51, 101, 201), and whereinthe lightning receptor (3, 53, 103, 203) and the lightning down conductor (2, 52, 102, 202) are electrically connected, characterized in thatthe shell body comprises at least a first conductive layer (60, 62) extending along at least a longitudinal part of the lightning down conductor (2, 52, 102, 202) in a transverse distance therefrom, wherein the first conductive layer (60, 62) is electrically isolated from the lightning down conductor (2, 52, 102, 202) and from the lightning receptor (3, 53, 103, 203), and wherein the first conductive layer (60, 62) has a sheet resistance in the range of 1 to 5 Mega Ohm per square.
1 Assignment
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Accused Products
Abstract
The invention relates to a wind turbine blade with a lightning protection system, where the blade comprises a shell body made of a composite material and comprises a longitudinal direction with a root end and a tip end. The blade further comprises a profiled contour including a pressure side and a suction side, as well as a leading edge and a trailing edge with a chord having a chord length extending there between, the profiled contour, when being impacted by an incident airflow, generating a lift. The lightning protection system comprises at least one lightning receptor arranged freely accessible in or on the shell unit surface at or in the immediate vicinity of the tip of the blade. The lightning protection system further comprises a lightning down conductor made of electrically conductive material extending within the shell body from the lightning receptor to the root end of the blade. The lightning receptor and the lightning down conductor are electrically connected. The shell body comprises at least a first conductive layer extending along at least a longitudinal part of the lightning down conductor in a transverse distance therefrom. The first conductive layer is electrically isolated from the lightning down conductor and from the lightning receptor, and has a sheet resistance in the range 1-5 Mega Ohm per square.
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Citations
15 Claims
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1. A wind turbine blade with a lightning protection system (1, 51, 101, 201), wherein the blade (1, 51, 101, 201) comprises a shell body made of a composite material and comprises a longitudinal direction with a root end and a tip end, the blade further comprising a profiled contour including a pressure side and a suction side, as well as a leading edge and a trailing edge with a chord having a chord length extending there between, the profiled contour, when being impacted by an incident airflow, generating a lift, and wherein the lightning protection system comprises:
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at least one lightning receptor (3, 53, 103, 203) arranged freely accessible in or on a surface of the shell body surface, and a lightning down conductor (2, 52, 102, 202) made of or comprising an electrically conductive material and extending within the shell body from the lightning receptor (3, 53, 103, 203) to the root end of the blade (1, 51, 101, 201), and wherein the lightning receptor (3, 53, 103, 203) and the lightning down conductor (2, 52, 102, 202) are electrically connected, characterized in that the shell body comprises at least a first conductive layer (60, 62) extending along at least a longitudinal part of the lightning down conductor (2, 52, 102, 202) in a transverse distance therefrom, wherein the first conductive layer (60, 62) is electrically isolated from the lightning down conductor (2, 52, 102, 202) and from the lightning receptor (3, 53, 103, 203), and wherein the first conductive layer (60, 62) has a sheet resistance in the range of 1 to 5 Mega Ohm per square. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method for retrofitting a lightning protection system to a wind turbine blade, wherein the blade (1, 51, 101, 201) comprises a shell body made of a composite material and comprises a longitudinal direction with a root end and a tip end, the blade further comprising a profiled contour including a pressure side and a suction side, as well as a leading edge and a trailing edge with a chord having a chord length extending there between, the profiled contour, when being impacted by an incident airflow, generating a lift, the method comprising the steps of:
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providing the blade (1, 51, 101, 201) with at least a first lightning receptor (3, 53, 103, 203) arranged freely accessible in or on a surface of the shell body surface, and optionally at or in the immediate vicinity of the tip end of the blade (1, 51, 101, 201), providing the blade (1, 51, 101, 201) with a lightning down conductor (2, 52, 102, 202) made of electrically conductive material extending within the shell body from the lightning receptor (3, 53, 103, 203) to the root end of the blade (1, 51, 101, 201), the lightning receptor (3, 53, 103, 203) and the lightning down conductor (2, 52, 102, 202) being electrically connected, and providing the shell body with at least a first conductive layer (60) extending along at least a longitudinal part of the lightning down conductor (2, 52, 102, 202) in a transverse distance therefrom, wherein the first conductive layer (60) is electrically isolated from the lightning down conductor (2, 52, 102, 202) and/or the lightning receptor (3, 53, 103, 203), and wherein the sheet resistance of the conductive layer (60) is in the range of 1 to 5 Mega Ohm pr. square.
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Specification