| 摘要 |
The invention provides a wind turbine with a lightning arrester system including one or more lightning receptors mounted on one or more rotor blades. A down conductor electrically connects one or more lightning receptors (R) to electrical ground via a sliding contact arrangement, and an electromagnetic radiation(EM) reductiondevice encircles a portion of the down conductor so as to reduce EM radiation from the down conductor. Such wind turbine will have a lowEM radiation, since electric impulses in the down conductor are attenuated by such EM radiation reductiondevices. Such electric impulses can be created because of static electric discharges caused by imperfect electric contact in the sliding contact arrangement. Known types of EM radiation reductiondevices in the form of commercially available common mode choke coils, cylindrically shaped nano- crystalline solid body types, or the like, can be used. A plurality of different types with different EM radiation reductionproperties can be used in combination. To obtain more effective EM radiation reduction, a plurality of EM radiation reduction devices can be used, e.g. positioned at several portions of the down conductor, especially close to sliding contact arrangements. A preferred position of an EM radiation reductiondevice (D)is on a down conductor part(W)in each rotor blade, at an end of the electrical conductor(W)facing the sliding contact arrangement (RL) serving to electrically connect the electrical conductor(W)to electrical ground. |
