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AssigneeLm Glasfiber A/S
InventorsKaj Olsen, Flemming Møller Larsen, Peter Grabau, John Ellermann Jespersen
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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.
Wind turbine blade comprising a first (1) and a second (2) electric conductor extending in the longitudinal direction of the blade (25), one or more electric heating elements (4) for heating the surface of the blade, said heating elements (4) being connected to the first (1) and the second (2) conductor, characterised in that said wind turbine blade is provided with a lightning conductor system known per se and comprising a lightning receptor (5) at the tip of the wind turbine blade and a third (3) electric conductor electrically connected to said lightning receptor (5), and which is earthed at the blade root, and that the first (1) and the second (2) conductor are connected through spark gaps (7a, 7b) adjacent the lightning receptor (5) to said lightning receptor and are earthed through spark gaps (9a, 9b) at the blade root.
Dependencies are inferred from the claim text.