Abstract: Wind turbine lightning stroke diagnostic apparatus for a wind turbine having conductive blades. A lightning protection system input is provided for receiving measured current data associated with a current conducted by the lightning protection system following a lightning stroke. An air pressure sensor is mounted using a mount within an internal cavity of a conducive wind turbine blade assembly. A sensor monitor monitors the measured current data and the output of the air pressure sensor for identifying a bypass lightning stroke when a measured current increase coincides with the detection of a lightning generated shockwave within the internal cavity by the air pressure sensor.

Abstract: Wind turbine lightning stroke diagnostic apparatus for a wind turbine having conductive blades. A lightning protection system input is provided for receiving measured current data associated with a current conducted by the lightning protection system following a lightning stroke. An air pressure sensor is mounted using a mount within an internal cavity of a conducive wind turbine blade assembly. A sensor monitor monitors the measured current data and the output of the air pressure sensor for identifying a bypass lightning stroke when a measured current increase coincides with the detection of a lightning generated shockwave within the internal cavity by the air pressure sensor.

Abstract: 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.

Abstract: 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.

Abstract: The invention relates to a wind turbine rotor blade which in its tip (1) is provided with a lightning receptor (2) and a drain passage (6; 16; 26; 36; 46; 56) connecting the blade interior (11, 12) with the blade exterior, the drain passage (6; 16; 26; 36; 46; 56) and the lightning receptor (2) having a common interface. The invention further relates to a lightning receptor provided with a drain passage (6; 36; 46; 56).

Abstract: Wind turbine blade comprises a first (1) and a second (2) electric conductor extending in the longitudinal direction of the blade (25), and one or more electric heating elements (4) for heating the surface of the blade. The heating elements (4) are connected to the first and the second electric conductor. At its tip the wind turbine blade (25) is provided with a lightning receptor 5 for catching lightning, and the lightning receptor (5) is electrically connected to a third (3) conductor earthed so as to be able to carry the current from a stroke of lightning to the earth. The first and the second conductor are connected to the lightning receptor through spark gaps adjacent said lightning receptor and connected to earth through spark gaps adjacent the blade root.

Abstract: A wind turbine blade with a lightning conductor, where said lightning conductor is formed by one or more oblong strips (1, 2, 3) of carbon fiber-reinforced plastics preferably forming part of the wind turbine blade. In this manner the oblong strips (1, 2, 3) of carbon fiber-reinforced plastics both reinforce the blade and divert the lightning.