Abstract: A lightning protection device includes a lightning arrester arranged on a nonmetallic blade and configured to receive a lightning current, and a blade down lead electrically connected to the lightning arrester. The lighting protection device further includes: a first lightning current conducting component, electrically connected to the blade down lead and connected to an outer surface of a generator rotor in an insulation manner; a second lightning current conducting component, connected to the outer surface of the generator rotor and an insulated nacelle cover in insulation manner, and electrically connected to the first lightning current conducting component via a metal conductor; and a lightning protection down lead, configured to electrically connect the second lightning current conducting component and a grounding component arranged inside a tower, to discharge the lightning current to ground through the tower.

Abstract: A lightning protection device for a wind turbine generator system includes at least a blade arrester, a down lead of a blade connected to the blade arrester, a lightning-proof element of a pitch bearing, a lightning-proof element of a rotor bearing. The lightning-proof element of the pitch bearing is arranged at the blade root, with one end connected to the down lead of blade and the other end connected to the lightning-proof element of the rotor bearing. The lightning protection device forms a lightning current conducting path passing through a cavity of the pitch bearing, a hollow of a rotor shaft and a cavity of the rotor bearing. A wind turbine generator system having the above mentioned lightning protection device is provided.

Abstract: A lightning protection device includes a lightning arrester arranged on a nonmetallic blade and configured to receive a lightning current, and a blade down lead electrically connected to the lightning arrester. The lighting protection device further includes: a first lightning current conducting component, electrically connected to the blade down lead and connected to an outer surface of a generator rotor in an insulation manner; a second lightning current conducting component, connected to the outer surface of the generator rotor and an insulated nacelle cover in insulation manner, and electrically connected to the first lightning current conducting component via a metal conductor; and a lightning protection down lead, configured to electrically connect the second lightning current conducting component and a grounding component arranged inside a tower, to discharge the lightning current to ground through the tower.

Abstract: A lightning protection device for a wind turbine generator system includes at least a blade arrester, a down lead of a blade connected to the blade arrester, a lightning-proof element of a pitch bearing, a lightning-proof element of a rotor bearing. The lightning-proof element of the pitch bearing is arranged at the blade root, with one end connected to the down lead of blade and the other end connected to the lightning-proof element of the rotor bearing. The lightning protection device forms a lightning current conducting path passing through a cavity of the pitch bearing, a hollow of a rotor shaft and a cavity of the rotor bearing. A wind turbine generator system having the above mentioned lightning protection device is provided.