Lightning protection of a pitch-controlled wind turbine blade

F - Mech Eng,Light,Heat,Weapons – 03 – D

Patent

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Details

F03D 11/00 (2006.01) H02G 13/00 (2006.01)

Patent

CA 2500643

A wind turbine rotor including a rotor hub (3) and a plurality of blades (4), and where each blade root (16) is connected to said rotor hub through a pitch bearing (5) in such a manner that the pitch angle of the blade is adjustable by a turning of the blade about its longitudinal axis relative to the rotor hub. The blade is provided with at least one electrically conducting lightening down-conductor (6) extending in the longitudinal direction of the blade to the blade root and being electrically isolated from the pitch bearing (5). A spark gap (15) is provided between the lightning down-conductor and the rotor hub, said spark gap (15) being adapted to conduct a lightning current passing through the lightning down-conductor. A sliding contact connection (7, 12) is provided parallel to the spark gap (15) between the lightning down- conductor (6) and the rotor hub (3), said sliding contact connection ensuring electrical contact between said lightening down-conductor (6) and said rotor hub (3) irrespective of the pitch angle of the blade. The invention also relates to a wind turbine including such a rotor.

La présente invention se rapporte à un rotor d'éolienne comprenant un moyeu de rotor (3) et une pluralité de pâles (4), chaque emplanture de pâle (16) étant raccordée audit moyeu de rotor par l'intermédiaire d'une articulation de pas (5) de telle manière que l'angle de pas de la pâle soit réglable par rotation de la lame autour de son axe longitudinal relativement au moyeu du rotor. La pâle est dotée d'au moins un câble de descente de foudre électriquement conducteur (6) s'étendant longitudinalement à la pâle jusqu'à l'emplanture de pâle et se trouvant électriquement isolé de l'articulation de pas (5). Un éclateur (15) est situé entre le câble de descente de foudre et le moyeu de rotor, ledit éclateur (15) étant conçu pour conduire un courant de foudre à travers le câble de descente de foudre. Une connexion à contact coulissant (7, 12) est disposée parallèlement à l'éclateur (15) située entre le câble de descente de foudre (6) et le moyeu de rotor (3), ladite connexion à contact coulissant assurant le contact électrique entre le câble de descente de foudre (6) et ledit moyeu de rotor (3) quelque soit l'angle de pas de la pâle. L'invention se rapporte également à une éolienne comportant un tel rotor.

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