CN117989081A

CN117989081A - Lightning protection device and wind generating set

Info

Publication number: CN117989081A
Application number: CN202211349312.4A
Authority: CN
Inventors: 杨鹏飞; 陈媛媛; 李强
Original assignee: Jinfeng Technology Co ltd
Current assignee: Jinfeng Technology Co ltd
Priority date: 2022-10-31
Filing date: 2022-10-31
Publication date: 2024-05-07

Abstract

The present disclosure provides a lightning protection device and a wind generating set. The lightning protection device is used for a wind generating set, the wind generating set comprises a tower drum, a yaw system and a cabin base, and the yaw system comprises a yaw annular member, a yaw moving member and a yaw bearing, wherein the yaw annular member is fixed at the top of the tower drum and arranged below the cabin base, and the yaw moving member moves relative to the yaw annular member and is fixed below the cabin base. The lightning protection device comprises: a conductive bracket fixed to and insulated from the nacelle base, a first end of the conductive bracket being remote from a sidewall of the tower and adapted to be connected to a lightning down conductor; and a brush having a second end of the conductive bracket near a side wall of the tower, the brush being fixed to the second end of the conductive bracket, wherein an outgoing cable of the brush is electrically connected to the conductive bracket, and the brush head is capable of contacting one of the side wall of the tower and a side surface of the yaw ring member or forming a discharge gap, and is used to transfer lightning current to the tower.

Description

Lightning protection device and wind generating set

Technical Field

The present disclosure relates to the field of wind power generation, and more particularly, to a lightning protection device and a wind generating set.

Background

With the increasing single-machine capacity of the wind generating set, the height of the hub and the diameter of the impeller are also increased, so that the wind generating set is easy to be struck by lightning. Typically, lightning protection systems are installed on wind power plants to direct lightning current from the impeller to the ground.

Typically, the bearings (e.g., pitch, main shaft, yaw, etc.) of the wind turbine are metal components and lightning current directed by the lightning protection system may flow through these bearings. When the wind generating set is struck by lightning, if lightning current flows through the metal bearing, the bearing is damaged by electric corrosion, lightning current breakdown and the like, and finally the safe operation of the bearing is seriously influenced. In addition, electrical corrosion and breakdown, etc., damage typically occurs inside the bearing or between two components that move relative to each other through the bearing, and thus such structural damage is not readily noticeable (e.g., burning the inner raceways and balls, etc.), and is typically only noticeable when the structural damage is exposed outside the bearing. Once the structural damage is exposed to the outside, the bearings have presented serious problems, which greatly increase the safety risk of the wind power plant.

The yaw bearing is a core part of the wind generating set. Once the yaw bearing is damaged, it directly affects the consistency, stability, and accuracy of the yaw motion. If maintenance or replacement of the yaw bearing is required, a longer downtime is required. Furthermore, replacement of the yaw bearing requires removal of the entire nacelle of the wind turbine and a large tonnage of hoisting machine for hoisting.

Disclosure of Invention

Accordingly, it is an object of the present disclosure to provide a lightning protection device capable of transferring lightning current to a tower independently of a yaw bearing.

The present disclosure also aims to provide a lightning protection device capable of ensuring stable transfer of lightning current and preventing concentrated discharge or flashover of the lightning current.

According to an aspect of the present disclosure, there is provided a lightning protection device for a wind power generation set including a tower and a yaw system and a nacelle bedplate located at a top of the tower, the yaw system including a yaw ring member fixed at the top of the tower and disposed below the nacelle bedplate, a yaw movement member moving relative to the yaw ring member and fixed below the nacelle bedplate, and a yaw bearing disposed between the yaw ring member and the yaw movement member or the nacelle bedplate. The lightning protection device comprises: a conductive bracket secured to and insulated from the nacelle base, a first end of the conductive bracket being remote from a sidewall of the tower and adapted to be connected to a lightning down conductor; and a brush having a second end of the conductive bracket near a side wall of the tower, the brush being fixed to the second end of the conductive bracket, wherein an outgoing cable of the brush is electrically connected to the conductive bracket, and the brush head is capable of contacting one of the side wall of the tower and a side surface of the yaw ring member or forming a discharge gap, and is used to transfer lightning current to the tower.

Preferably, the lightning protection device may further include: a first insulating member for being disposed between the electrically conductive bracket and the nacelle base; and a second insulating member for clamping the conductive bracket together with the first insulating member, wherein the conductive bracket is fixedly connected to the nacelle base through the first insulating member and the second insulating member.

Preferably, the lightning protection device may further include: an insulating member disposed between the conductive bracket and the nacelle base; an insulating fastening assembly secures the electrically conductive bracket to the nacelle base through the electrically conductive bracket and the insulating member.

Preferably, a plurality of brushes may be fixed to the conductive bracket, and an angle of 0 ° to 10 ° is formed between the brushes.

Preferably, the brush may be a constant voltage brush.

Preferably, the conductive support may include: a first mounting portion extending in a horizontal direction and for fixing the conductive bracket to the nacelle base; the first bending part is positioned at the first end of the first installation part and bends downwards and is used for conforming to the extending direction of the lightning-protection down conductor.

Preferably, the conductive bracket may further include: a second bending part extending vertically downward from a second end of the first mounting part and for connecting to an outgoing cable of the brush; and a second mounting portion extending horizontally from the second bending portion toward the one of the side wall of the tower and the side surface of the yaw ring member for fixing the brush.

Preferably, a brush box of the brush may be disposed around the brush head, wherein the brush box may be fixed to the conductive holder, and the brush head may be fixed to the conductive holder through the brush box.

According to another aspect of the present disclosure, a wind power plant is provided, comprising a lightning protection device as described above.

Preferably, the lightning protection means may be provided inside or outside the tower or the yaw ring member.

Preferably, the tower can comprise a tower main body and a tower top flange positioned at the top of the tower main body, the lightning protection device is arranged on the inner side of the tower, and the brush head is contacted with the inner side wall of the tower top flange or forms a discharge gap.

Preferably, the wind generating set may further include a plurality of yaw brake calipers, the yaw ring member includes a brake disc located at a radially inner side, the lightning protection device is disposed at an inner side of the tower and between two adjacent yaw brake calipers of the plurality of yaw brake calipers, and the brush head contacts with the brake disc or forms a discharge gap.

Preferably, the tower may include a tower body and a tower top flange located at a top of the tower body, the yaw ring member is a yaw ring gear, the yaw bearing is a sliding bearing and is disposed between the yaw ring gear and the nacelle bedplate, the yaw movement member is a driving pinion engaged with the yaw ring gear, the driving pinion is connected with a rotating shaft of the driving motor, wherein the yaw ring gear includes a yaw ring gear body portion and a tower connection portion located at a lower side of the yaw ring gear body portion, the sliding bearing is disposed on an upper surface of the yaw ring gear body portion, a brake disc is formed at a radially inner side of the yaw ring gear body portion, a tooth portion for engaging with the driving pinion is formed at a radially outer side of the yaw ring gear body portion, the tower connection portion is connected with the tower top flange, and the brush head is in contact with an inner side wall of the tower connection portion or forms a discharge gap.

By adopting the lightning protection device, the lightning current from the lightning down conductor can be transmitted to the tower along the independent flow path independent of the yaw bearing, so that the yaw bearing is prevented from being broken down by the lightning current, and damage of the lightning current to the yaw bearing is avoided. In addition, lightning current is transmitted from the brush head of the brush to the arc-shaped surface of the tower or the yaw annular member in a point-to-surface manner, so that stable transmission of the lightning current can be ensured, and the condition of concentrated discharge or flashover of the lightning current can be prevented. In addition, lightning current is led to the tower from the lightning down conductor through the conductive support and the electric brush, so that the occurrence of twisting of cables can be avoided, and the lightning current path is far away from a communication cable and the like positioned in the center of the tower.

Drawings

The foregoing and other objects, features, and advantages of the disclosure will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings in which:

FIG. 1 is a perspective view of a structure in which a lightning protection device according to an embodiment of the present disclosure is mounted inside a yaw ring member;

Fig. 2 is an enlarged view of the region P in fig. 1;

FIG. 3 is a partial cross-sectional view of the structure of FIG. 1 with the lightning protection device mounted inside the yaw annular member.

Detailed Description

Embodiments in accordance with the present disclosure will now be described in detail with reference to the drawings, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the like elements throughout.

Fig. 1 is a perspective view of a structure in which a lightning protection device according to an embodiment of the present disclosure is mounted inside a yaw ring member, fig. 2 is an enlarged view of a region P in fig. 1, and fig. 3 is a partial sectional view of the structure in which the lightning protection device in fig. 1 is mounted inside the yaw ring member. In fig. 1 to 3, in order to make the positional relationship between the lightning protection device 10 and the yaw system and the nacelle bedplate 40 clear, some components of the wind turbine generator set (e.g., tower main body, tower top flange, yaw movement member, yaw bearing, etc.) are omitted, or only a portion of some components of the wind turbine generator set (e.g., only a portion of the nacelle bedplate 40 is shown) are omitted. The specific structure of the lightning protection device 10 according to the present disclosure will be described below with reference to fig. 1 to 3.

The lightning protection device 10 according to the present disclosure may be used in a wind power generation set. The wind park comprises a tower and a yaw system and nacelle bedplate 40 at the top of the tower, the yaw system typically comprising a yaw ring member 30 fixed at the top of the tower and arranged below the nacelle bedplate 40, a yaw movement member moving relative to the yaw ring member 30 and fixed below the nacelle bedplate 40, and a yaw bearing arranged between the yaw ring member 30 and the nacelle bedplate 40.

The lightning protection device 10 according to the embodiment of the present disclosure includes: a conductive bracket 11 fixed to the nacelle base 40 and insulated from the nacelle base 40, a first end of the conductive bracket 11 being remote from a sidewall of the tower and adapted to be connected to the lightning down conductor 20; the second end of the brush 12, the conductive holder 11 being close to the side wall of the tower, the brush 12 being fixed to the second end of the conductive holder 11, wherein the outgoing cable 122 of the brush 12 is electrically connected with the conductive holder 11, and the brush head 121 is capable of contacting one of the side wall of the tower and the side face of the yaw annular member 30 or forming a discharge gap. During yaw, the nacelle bedplate 40 drives the brushes 12 to rotate along the side wall of the tower or the side surface of the yaw annular member 30, and the brushes 12 are always in contact with the side wall of the stationary tower or the side surface of the yaw annular member 30 or form a discharge gap, so that the continuous lightning current transmission path is ensured.

Yaw ring member 30 is mounted on top of the tower so that yaw ring member 30 forms an equipotential with the tower and the earth. By employing the lightning protection device 10 described above, lightning current from the lightning down conductor 20 will flow through the conductive bracket 11, the outgoing cable 122 of the brush 12 and the brush head 121 of the brush 12 in that order, then to the side wall of the tower or the side face of the yaw ring member 30, and finally the lightning current will flow to the ground through the tower. Compared to yaw bearings, the tower has very little resistance and forms an equipotential with the earth, so lightning current flows towards the tower and earth without flowing towards the yaw bearings. That is, in embodiments of the present disclosure, the lightning current transfer paths described above are independent paths from the yaw bearing, i.e., the yaw bearing does not participate in lightning current transfer. In particular, in case the yaw bearing is a rolling bearing, the moving coil, the fixed coil and the rolling bodies of the rolling bearing do not transfer lightning current, which can prevent lightning current breakdown from occurring between any two of the moving coil, the fixed coil and the rolling bodies of the rolling bearing, which would cause structural damage to the bearing, thereby avoiding damage to the yaw bearing by lightning current. In the case of a yaw bearing being a plain bearing, the lightning current is not transferred between the two relatively moving parts located on both sides of the bearing shell of the plain bearing, so that lightning current breakdown does not occur between the two relatively moving parts.

Further, the side wall of the tower or the side surface of the yaw ring member 30 is an arc-shaped surface, and lightning current is transferred from the brush head 121 of the brush 12 to the arc-shaped surface of the tower or the yaw ring member 30 (i.e., lightning current is transferred from point to point), so that stable transfer of lightning current can be ensured and concentrated discharge or flashover of lightning current can be prevented, compared to transfer of lightning current from point to point. In addition, compared with directly guiding lightning current from the lightning down conductor to the ground through the cable, guiding lightning current from the lightning down conductor to the side wall of the tower or the side face of the yaw annular member through the conductive bracket can prevent the occurrence of twisting of the cable, and the lightning flow path from the lightning down conductor to the side wall of the tower or the side face of the yaw annular member is close to the side wall of the tower, away from the communication cable or the like located at the center of the tower, which can avoid interference of lightning current to signal transmission.

Furthermore, the lightning protection device 10 may further comprise: a first insulating member 13 for being disposed between the electrically conductive bracket 11 and the nacelle base 40; the second insulating member 14 is used for clamping the conductive bracket 11 together with the first insulating member 13, and the conductive bracket 11 is fixedly connected to the nacelle base 40 through the first insulating member 13 and the second insulating member 14. For example, the second insulating member 14, the conductive bracket 11, and the first insulating member 13 are formed with mounting holes, and fasteners pass through the mounting holes of the second insulating member 14, the conductive bracket 11, and the first insulating member 13 to detachably fix the conductive bracket 11 to the nacelle base 40. The mounting hole formed on the conductive bracket 11 has a size larger than that of the fastener to prevent the fastener from contacting the conductive bracket 11, so that the conductive bracket 11 can be insulated from the nacelle base 40 even if the fastener is a conductive member, which can prevent lightning from being transmitted to the nacelle base 40.

However, the present disclosure is not limited thereto, and the conductive brackets 11 may also be fixed to the nacelle base 40 and insulated from the nacelle base 40 by other means. Optionally, the lightning protection device 10 may further include: an insulating member provided between the conductive bracket 11 and the nacelle base 40; an insulating fastening assembly secures the electrically conductive bracket 11 to the nacelle base 40 through the electrically conductive bracket 11 and the insulating member. The insulating fastening component may be a fastener having an insulating coating or insulating sleeve on the surface engaging the nacelle bedplate 40, or may be an integral insulating fastener. As another example, the conductive bracket 11 may also be fixed to the nacelle base 40 only by an insulating member, for example, the insulating member may be provided around the conductive bracket 11, and an upper side of the insulating member is fixed on a lower surface of the nacelle base 40.

As shown in fig. 2, three brushes 12 are fixed to the conductive bracket 11. However, the present disclosure is not limited thereto, and one, two, four, or more brushes 12 may be fixed on the conductive bracket 11. In the case where a plurality of brushes 12 are fixed to the conductive holder 11, even if there is a failure in the brushes or lightning current cannot be transmitted to the side wall of the tower or the side surface of the yaw ring member, the lightning current can be transmitted through the other brushes.

In addition, since the side wall of the tower or the side surface of the yaw ring member 30 is an arc surface, and the arc surfaces of the tower and the yaw ring member 30 of different specifications are different, an included angle of 0 ° to 10 ° may be formed between the plurality of brushes 12 in order to accommodate the different arc surfaces. For example, the brushes 12 may be rotated as needed to adjust the angle between the brushes 12, thereby increasing the contact area between the brush head 121 and the circular arc surface of the brushes 12 as much as possible.

In an embodiment of the present disclosure, the brush 12 may be a constant voltage brush. The constant voltage brush ensures the constant contact pressure between the brush head and the arc surface through the constant voltage spring. However, the present disclosure is not limited thereto, and the brush 12 may be replaced with other conductive members, such as a conductive cable, etc., capable of transmitting lightning current from the conductive brackets 11 to the arc surface of the tower or yaw ring member 30. Or in addition to the lightning current transferred from the conductive holder 11 to the circular arc surface of the tower or yaw ring member 30 through the brushes 12, a tip may be formed on the conductive holder 11, and a discharge gap may be formed between the tip and the circular arc surface of the tower or yaw ring member 30 for lightning current transfer.

The brush 12 may include a brush box 123 disposed around the brush head 121 in addition to the brush head 121 and the lead-out cable 122, the brush box 123 being fixed to the conductive holder 11, and the brush head 121 may be fixed to the conductive holder 11 by the brush box 123.

As shown in fig. 3 in combination with fig. 2, the conductive bracket 11 may include: a first mounting portion 111 extending in a horizontal direction and for fixing the conductive bracket 11 to the nacelle base 40; the first bending part 112 is located at the first end of the first mounting part 111 and bends downward to conform to the extending direction of the lightning down conductor 20. Through making the extending direction of lightning protection down lead is complied with to first kink, can make lightning protection down lead and electrically conductive support smooth connection, can not buckle the lightning protection down lead, prevent that the emergence of electrodynamic force from leading to lightning protection down lead to stretch out. In addition, by bending the first bending portion downward, structural interference caused by oversized nacelle base can also be avoided. Further, as shown in fig. 2 and 3, the mounting hole of the conductive bracket 11 for the fastener or the insulating fastening member to pass through is formed at the first mounting portion 111.

In addition, the conductive bracket 11 may further include: a second bending portion 113 extending vertically downward from a second end of the first mounting portion 111 and for connecting to an outgoing cable 122 of the brush 12; a second mounting portion 114 extending horizontally from the second bending portion 113 toward the one of the side wall of the tower and the side surface of the yaw ring member 30 for fixing the brush 12. Through setting up the second kink of vertical extension (being connected to the lead-out cable) between the first installation department of horizontal extension and second installation department, can effectively reduce the horizontal length of electrically conductive support, make it more be applicable to the narrow and small space near yaw system.

Although it is described above that the lightning current is transferred to the brush 12 through the second bent portion 113 of the conductive bracket 11, the present disclosure is not limited thereto, and for example, if the length of the outgoing cable of the brush is sufficient, the outgoing cable may be directly connected with the lightning-protection down conductor 20.

The present disclosure also provides a wind power generation set comprising a lightning protection device 10 as described above. As shown in fig. 1, the lightning protection device 10 described above is mounted inside a yaw ring member 30. However, embodiments of the present disclosure are not limited thereto, and the lightning protection device 10 may also be mounted outside the yaw annular member 30, or inside or outside the tower, so long as lightning current can be transferred to the tower independently of the yaw bearing.

In embodiments of the present disclosure, the lightning protection device 10 may be mounted with the brush head 121 of the brush 12 facing the side wall of the tower or the side of the yaw ring member 30 to directly electrically connect the brush head 121 of the brush 12 with the side wall of the tower or the side of the yaw ring member 30 or to form a discharge gap. In particular, the side wall of the tower may refer to the side wall of any component comprised by the tower, and the side of the yaw ring member 30 may refer to the side of any component comprised by the yaw ring member 30. The specific location of the lightning protection device 10 on a wind turbine will be described in detail below.

As a first example, the tower may include a tower body and an overhead flange at the top of the tower body. The lightning protection device 10 according to the present disclosure may be disposed inside the tower and the brush head 121 may contact the inside wall of the tower top flange or form a discharge gap. In this way, lightning current can be transferred from the brush 12 to the tower.

As a second example, as shown in FIG. 1, the wind turbine may also include a plurality of yaw brake calipers 50, and the yaw ring member 30 includes a brake disc (not shown) located radially inward, with which the yaw brake calipers 50 cooperate to effect braking of the yaw system. The lightning protection device 10 is arranged inside the tower and between two adjacent yaw brake calipers 50, the brushes 12 being in contact with the brake disc to transfer lightning current directly from the brush heads 121 of the brushes 12 to the brake disc and subsequently to the yaw annular member 30. Alternatively, a discharge gap may be formed between the brush head 121 and the brake disc. Further, since the yaw ring member 30 is mounted on top of the tower, lightning current can be transferred from the yaw ring member 30 to the tower.

As a third example, the yaw ring member 30 may be a yaw ring gear, the yaw bearing may be a plain bearing and disposed between the yaw ring gear and the nacelle bedplate 40, and the yaw movement member may be a drive pinion engaged with the yaw ring gear, the drive pinion being connected with a rotational shaft of the drive motor. In this case, the yaw movement member 40 can move the nacelle along the circumferential direction of the yaw ring member 30 to achieve yaw. The yaw ring gear may include a yaw ring gear main body portion and a tower connection portion located at a lower side of the yaw ring gear main body portion, and the slide bearing is provided at an upper surface of the yaw ring gear main body portion. A brake disc is formed on the radially inner side of the yaw ring gear main body portion, and a tooth portion for meshing with the drive pinion is formed on the radially outer side of the yaw ring gear main body portion. The tower connecting part is used for being connected with the tower top flange, and the brush head 121 is contacted with the inner side wall of the tower connecting part or forms a discharge gap. Since the tower connection is mounted on top of the tower, lightning current can be transferred from the tower connection to the tower.

In the first and second examples described above, the yaw bearing may be a sliding bearing or a rolling bearing. In the case where the yaw bearing is a slide bearing, the yaw ring member 30 may be a yaw ring gear, and the yaw bearing may be disposed between an upper surface of the yaw ring gear and a lower surface of the nacelle bedplate 40, similarly to the third example, and the yaw movement member may be a drive pinion engaged with the yaw ring gear, the drive pinion being connected with a rotation shaft of the drive motor. In contrast, in the case where the yaw bearing is a rolling bearing, the rolling bearing is disposed between the yaw ring member 30 and the yaw movement member, and a fixed ring of the rolling bearing is fixed to the yaw ring member 30, and a moving ring of the rolling bearing is fixed with respect to the nacelle bedplate 40. In this case, gear teeth are fixed to the moving coil of the rolling bearing, and the yaw movement member 40 may be a drive pinion engaged with the gear teeth, the drive pinion being connected to a rotation shaft of the drive motor. Likewise, the yaw movement member 40 can move the nacelle along the circumferential direction of the yaw ring member 30 to achieve yaw.

However, the present disclosure is not limited thereto, and the yaw movement member 40 may be moved with respect to the yaw ring member 30 by other means than the gear transmission manner described above. For example, the yaw movement member 40 is a roller, and the yaw ring member 30 is formed with a track to be engaged with the roller. As another example, yaw movement member 40 may move relative to yaw ring member 30 via a belt or chain drive.

In embodiments of the present disclosure, the brush 12 may be mounted horizontally, with the brush head 121 facing a side surface of the yaw ring member 30 (as shown in fig. 1-3). However, the present disclosure is not limited thereto, and the brushes may be installed vertically, and accordingly, the brush heads of the brushes may contact with a plane extending in a horizontal direction of the tower or yaw ring member or form a discharge gap. For example, the brake disc may be a projection formed on the radially inner side of the yaw ring member 30, which is rectangular in cross section in the circumferential direction, so that the projection has an upper surface, a lower surface, and a side surface exposed to the outside. The brush 12 shown in fig. 1 to 3 is horizontally installed so that the brush head 121 can be in contact with the convex side surface. In contrast, in the case of a brush mounted vertically, the brush head of the brush may face the convex upper or lower surface and contact the convex upper or lower surface or form a discharge gap.

Preferably, the arrangement of the lightning current transmission paths in the wind turbine generator system is as smooth as possible away from electromagnetic environment sensitive components such as signal cables or sensors, and adverse effects on signal transmission and normal operation of electrical components caused by large current inrush in the process of lightning strike of the wind turbine generator system can be reduced to the greatest extent.

Preferably, in the present disclosure, the lightning current path from the fan blade to the ground does not pass through other bearings of the wind power plant (e.g. pitch bearings and main shaft bearings), which makes the lightning current flow to the ground completely independent of all bearings of the wind power plant, ensuring a stable operation of all bearings of the wind power plant. Further, the lightning down conductor 20 in the present disclosure receives lightning current from at the pitch bearing or the main shaft bearing, e.g., receives lightning current that is transferred independent of the pitch bearing and the main shaft bearing.

By adopting the lightning protection device disclosed by the invention, lightning current from the lightning down conductor can be transmitted to the tower along the independent flow path independent of the yaw bearing, and the yaw bearing can be prevented from being broken down by the lightning current, so that damage of the lightning current to the yaw bearing is avoided. In addition, lightning current is transmitted from the brush head of the brush to the arc-shaped surface of the tower or the yaw annular member in a point-to-surface manner, so that stable transmission of the lightning current can be ensured, and the condition of concentrated discharge or flashover of the lightning current can be prevented. In addition, lightning current is guided to the tower from the lightning-proof down conductor through the conductive support and the electric brush, so that the occurrence of twisting of cables can be avoided, the lightning current path is close to the side wall of the tower and is far away from a communication cable and the like positioned in the center of the tower, and the interference of the lightning current on signal transmission can be avoided.

Although a few embodiments of the present disclosure have been shown and described, it would be appreciated by those skilled in the art that changes may be made in these embodiments without departing from the principles and spirit of the disclosure, the scope of which is defined in the claims and their equivalents.

Claims

1. A lightning protection device (10) for a wind power generation unit comprising a tower and a yaw system and a nacelle bedplate (40) located at the top of the tower, the yaw system comprising a yaw ring member (30) fixed at the top of the tower and arranged below the nacelle bedplate (40), a yaw movement member moving relative to the yaw ring member (30) and fixed below the nacelle bedplate (40), and a yaw bearing arranged between the yaw ring member (30) and the yaw movement member or the nacelle bedplate (40), characterized in that the lightning protection device (10) comprises:

-an electrically conductive bracket (11) fixed to the nacelle base (40) and insulated from the nacelle base (40), the first end of the electrically conductive bracket (11) being remote from the side wall of the tower and being adapted for connection to a lightning down conductor (20);

-a brush (12), the second end of the conductive holder (11) being close to the side wall of the tower, the brush (12) being fixed to the second end of the conductive holder (11), wherein an outgoing cable (122) of the brush (12) is electrically connected to the conductive holder (11), and the brush head is capable of contacting one of the side wall of the tower and the side face of the yaw ring member (30) or forming a discharge gap, and for transferring lightning current to the tower.

2. The lightning protection device according to claim 1, wherein the lightning protection device (10) further comprises:

a first insulating member (13) for being arranged between the electrically conductive bracket (11) and the nacelle base (40);

a second insulating member (14) for holding the conductive bracket (11) together with the first insulating member (13),

Wherein the electrically conductive bracket (11) is fixedly connected to the nacelle foundation (40) by means of the first insulating member (13) and the second insulating member (14).

3. The lightning protection device according to claim 1, wherein the lightning protection device (10) further comprises:

an insulating member provided between the conductive bracket (11) and the nacelle base (40);

an insulating fastening assembly, securing the electrically conductive bracket (11) to the nacelle base (40) through the electrically conductive bracket (11) and the insulating member.

4. The lightning protection device according to claim 1, characterized in that a plurality of the brushes (12) are fixed on the conductive bracket (11), and an included angle of 0 ° to 10 ° is formed between the plurality of brushes (12).

5. The lightning protection device according to claim 1, characterized in that the brush (12) is a constant voltage brush.

6. The lightning protection device according to claim 1, characterized in that the electrically conductive support (11) comprises:

A first mounting portion (111) extending in a horizontal direction and for fixing the electrically conductive bracket (11) to the nacelle base (40);

the first bending part (112) is positioned at the first end of the first mounting part (111) and bends downwards and is used for conforming to the extending direction of the lightning-protection down conductor (20).

7. The lightning protection device according to claim 6, wherein the electrically conductive bracket (11) further comprises:

A second bending portion (113) extending vertically downward from a second end of the first mounting portion (111) and for connecting to an outgoing cable (122) of the brush (12);

A second mounting portion (114) extending horizontally from the second bending portion (113) toward the one of the side wall of the tower and the side surface of the yaw ring member (30) for fixing the brush (12).

8. The lightning protection device according to claim 1, characterized in that a brush box (123) of the brush (12) is arranged around the brush head (121), wherein the brush box (123) is fixed to the electrically conductive holder (11) and the brush head (121) is fixed to the electrically conductive holder (11) by means of the brush box (123).

9. A wind power plant, characterized in that it comprises a lightning protection device (10) according to any of claims 1 to 8.

10. Wind power plant according to claim 9, characterized in that the lightning protection means (10) are arranged inside or outside the tower or the yaw ring member (30).

11. Wind power generator set according to claim 9, characterized in that the tower comprises a tower body and a tower top flange at the top of the tower body, the lightning protection device (10) is arranged at the inner side of the tower, and the brush head (121) is in contact with the inner side wall of the tower top flange or forms a discharge gap.

12. The wind power generator set of claim 9, further comprising a plurality of yaw brake calipers (50), the yaw ring member (30) comprising a brake disc located radially inward, the lightning protection device (10) being arranged inward of the tower and between two adjacent yaw brake calipers (50) of the plurality of yaw brake calipers (50), the brush head (121) being in contact with the brake disc or forming a discharge gap.

13. Wind park according to claim 9, wherein the tower comprises a tower body and a tower top flange at the top of the tower body, wherein the yaw ring member (30) is a yaw ring gear, wherein the yaw bearing is a slide bearing and is arranged between the yaw ring gear and the nacelle bedplate (40), wherein the yaw movement member is a drive pinion engaging with the yaw ring gear, wherein the drive pinion is connected with a rotating shaft of the drive motor, wherein the yaw ring gear comprises a yaw ring gear body part and a tower connection part located below the yaw ring gear body part, wherein the slide bearing is arranged on the upper surface of the yaw ring gear body part, wherein the radially inner side of the yaw ring gear body part forms a brake disc, wherein the radially outer side of the yaw ring gear body part forms a tooth part for engaging with the drive pinion, wherein the tower connection part is adapted to be connected with the tower top flange, and wherein the brush head (121) is in contact with the inner side wall of the tower connection part or forms a discharge gap.