Patent ID: 6612810
Filing Date: 2003-09-02
Classification: F03D,Y02E,Y10S

Abstract:
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.