摘要:
A lightning current transfer system for a wind turbine generator is provided, the wind turbine generator comprising a rotor including a hub, a blade bearing, a blade, and a spinner, and a nacelle, the blade being rotatable relative to the hub and the hub being rotatable relative to the nacelle. In order to effectively protect the wind turbine generator from damage caused by lightning, to increase flexibility of use, simplicity, rigidness, operational safety and durability of such a lightning current transfer system, especially for use in a wind turbine generator brought into offshore operation, the lightning current transfer system comprises a first electrical contact arrangement including first and second complementary contact members, the first contact member being supported at the blade and being in electrical connection with a blade conductor arrangement arranged on the blade, the second contact member being supported at the hub, the spinner or the blade bearing, wherein the first and the second contact members are arranged to be electrically connectable to each other, conducting means connected to the first electrical contact arrangement, a second electrical contact arrangement connected to the conducting means and including third and fourth complementary contact members, the third contact member being supported at the hub, the spinner or the blade bearing, the fourth contact member being supported at the nacelle, wherein the third and the fourth contact members are arranged to be electrically connectable to each other, the lightning current transfer system providing a current path for a lightning current from the blade to the nacelle, the current path including the first electric contact arrangement, the conducting means and the second electric contact arrangement, the first contact member being arranged in a predetermined distance from a blade root of the blade, said blade root being mounted to the hub by means of the blade bearing, and wherein the first contact member is formed as a discharge ring being connected to the blade conductor arrangement, the blade conductor arrangement being formed by a metal foil or a metal mesh extending over at least a part of a longitudinal extension of the blade, wherein the lightning current transfer system is disposed inside of the spinner and/or inside of the nacelle, and wherein the conducting means is mounted stationarily at a mounting member, the mounting member being supported at the spinner, the hub or the blade bearing or being formed by the spinner, the hub or the blade bearing. Moreover, a wind turbine generator comprising a lightning current transfer system of the aforementioned kind is provided.
摘要:
A receptor assembly (1; 5) for a lightning protection system for a wind turbine blade (2) is disclosed, comprising electrically conducting current carriers (6; 19) and mounting bolts (9) and/or threaded rods (20), wherein each of the current carriers is a metallic part arranged and dimensioned to surround at least a part of a mounting bolt or a threaded rod without being in electrical contact with the mounting bolt or threaded rod, at least a part of the external surface at one end of each current carrier is arranged to be a contact surface (10) for mechanical and electrical contact to a receptor base (3; 16) in such a way that, in the case of a lightning impact on the receptor, the lightning current passes through the one or more current carriers rather than through the one or more mounting bolts and/or threaded rods on its way through the receptor.
摘要:
A side receptor (1) for a lightning protection system for a wind turbine blade (2) is disclosed, comprising a receptor cylinder (6), a mounting bolt (9) and a receptor plug (7), wherein the receptor cylinder is a tubular metallic part with one partly closed end penetrated by a centred hole, the diameter of which centred hole is slightly larger than the diameter of the thread part of the mounting bolt, wherein the inner diameter of the receptor cylinder is larger than the diameter of the head of the mounting bolt and the internal length of the receptor cylinder is larger than the height of the head of the bolt, and wherein the receptor plug is dimensioned to fit into the end of the receptor cylinder opposite the partly closed end to cover the head of the mounting bolt concealed therein.
摘要:
A lightning measuring system (LMS) for measuring lightning current parameters in a down conductor(DC) in a wind turbineis disclosed, said lightning measuring system (LMS) comprising -a sensor arrangement (SEA) being arranged to measure on said down conductor (DC), -a data collection unit (DCU), -a connection arrangement (CA) electrically connecting said sensor arrangement (SEA) with said data collection unit (DCU), and -an insulating arrangement (INS), wherein said sensor arrangement (SEA) and at least a part of said connection arrangement (CA) and/or said down conductor (DC) being enclosed insaid insulating arrangement (INS) thereby defining -a minimum insulation distance (MID) between said sensor arrangement (SEA) and said down conductor (DC), and -a minimum surface distance (MSD) between an exposed part of said down conductor (DC) not being enclosed by said insulating arrangement (INS) and an exposed part of said connection arrangement (CA) not being enclosed by said insulating arrangement (INS), for which said insulating arrangement (INS) is effective to prevent insulation breakdown between said down conductor (DC) and said sensor arrangement (SEA) and to prevent surface flashover between said exposed part of said down conductor (DC) and said exposed part of said connection arrangement (CA).
摘要:
A fully insulated tip unit (1) for a lightning protection system for a wind turbine blade (2) is disclosed, comprising an electrically conducting tip (3), which tip consists of an external part (4) and an internal part (5), at least one side receptor base (6), an internal tip unit conductor (8), an insulated electric cable (9) for forming the outermost part of a down conductor (10), and a connection element (12) for establishing electrical connection between the insulated electric cable and the other conducting parts of the tip unit, wherein the internal part of the tip, the side receptor base(s), the internal tip conductor, the connection element and one end of the insulated electric cable are all embedded by casting in an insulating material (13) leaving only the external part of the tip and the other end of the insulated electric cable uncovered by the insulating material. Furthermore, a wind turbine blade comprising such a tip unit is disclosed.