Method of lightning protection of a blade for a wind power plant, a lightning protection wing and a wind power plant with such a blade

摘要

The invention relates to a method of lightning-proofing a blade (1) on a wind-energy plant, which blade comprises a blade shell (2) configured essentially as a fiber-reinforced laminate, which laminate comprises electrically conductive fibers, wherein the blade comprises at least one lightning arrester (9) configured for conducting lightning current, including preferably to ground. The method comprises that the electrically conductive fibers are connected to each other, and that at least one metallic receptor (4, 24, 25) is arranged for capturing lightning current at or in proximity of the external face of the blade; and that the receptor and the fibers are connected to the lightning arrester for equalizing the difference in potential between the lightning arrester and the electrically conductive fibers. When the electrically conductive fibers are connected to each other, the fibers will cooperate on the conduction of a possible lightning current to prevent the current from running in individual fibers. Simultaneously the metallic receptor will serve as the primary lightning capturing device and reduce the risk of lightning striking the laminate. The receptor being connected to the lightning arrester, the current will predominately be conducted to ground, while the risk of transfer to the laminate is minimized in that a possible difference in potential between fibers and lightning arrester has been equalized.