CN211287980U

CN211287980U - Wind generating set cabin cover lightning protection system

Info

Publication number: CN211287980U
Application number: CN201922376130.6U
Authority: CN
Inventors: 陈国飞
Original assignee: Beijing Xinye New Energy Technology Co ltd
Current assignee: Beijing Xinye New Energy Technology Co ltd
Priority date: 2019-12-25
Filing date: 2019-12-25
Publication date: 2020-08-18
Anticipated expiration: 2029-12-25

Abstract

The utility model relates to a wind generating set cabin cover lightning protection system, including lightning protection arrester, equipotential cage and ground bus. The lightning protection lightning arrester is arranged at the tail of the cabin shell; the lightning protection lightning arrester is connected with an equipotential cage, the equipotential cage is annularly arranged on the inner wall of the cabin, and the equipotential cage is connected with the hub through a first carbon brush device; the equipotential cage is connected with the equipotential cage through a second carbon brush device, and the grounding busbar is sleeved outside the tower barrel. The utility model discloses a set up the lightning protection arrester on the cabin shell, avoid the thunderbolt as protection anemometer and wind indicator to avoid the thunderbolt, pass through earthing cable with the lightning current to cabin upper platform under the condition that suffers the thunderbolt, avoid the lightning current along transmission system's conduction. Inside the cabin, become complete equipotential cage with cabin, tower section of thick bamboo global design, belong to the clean area of electromagnetism in the equipotential cage, can effectively shield the circuit thunder and lightning interference that thunder and lightning electromagnetic pulse arouses.

Description

Wind generating set cabin cover lightning protection system

Technical Field

The utility model relates to a lightning-arrest equipment, concretely relates to wind generating set cabin cover lightning protection system.

Background

Wind energy is a renewable green clean energy, and a wind turbine generator is a device capable of generating power by utilizing the wind energy, and along with the increase of the capacity of a single machine of the wind turbine generator and the increase of the height of a machine body, the severity of lightning disasters of the wind turbine generator is becoming remarkable day by day.

Direct lightning is an atmospheric discharge process, the path of which includes the area of the top of an object or building having a lightning receptor, and even the area protected by direct lightning. In the area of direct lightning, any person and electrical equipment are at risk. The direct lightning strikes result in a series of destructive effects, such as electrical, thermal or mechanical effects, along the discharge path. The wind generating set comprises a tower barrel and an engine room cover arranged at the top end of the tower barrel, lightning current of the engine room cover of the wind generating set mainly comes from the leakage lightning current of a hub blade and the leakage lightning current of a lightning receptor at the top of a wind vane, and therefore a lightning protection system needs to be installed inside the wind generating set to protect the wind generating set.

SUMMERY OF THE UTILITY MODEL

The direct lightning protection is based on maxwell equilibrium equations. The discharge time of lightning current is very short, the high-frequency discharge current makes the inductance of the current discharge path more important than the actual resistance, and the inductance of the current discharge path can quickly fall back along with the end of the discharge process. Thus, it is not important for the current discharge path to be a solid or peripherally charged conductor around it, since the electromagnetic field is zero inside the enclosed object. Based on the above, the line connected with the lightning arrester comprises an equipotential cage and a lightning protection system.

Lightning current is generally conducted to all metal parts of equipment in the wind turbine generator system, and the lightning protection claw and carbon brush structure is used for protecting the bearing of the rotating part and performing electrostatic compensation, and the static balance generally occurs in the time before the thunderstorm comes.

The utility model aims at providing a wind generating set cabin cover lightning protection system utilizes the characteristic of direct lightning current to protect wind generating set, installs the equipotential cage on wind generating set's cabin shell inner wall, avoids wind generating set impaired.

In order to accomplish the above object, the utility model provides a wind generating set cabin cover lightning protection system, including lightning protection arrester, equipotential cage and ground bus. The lightning protection lightning receptor is arranged at the tail part of the cabin shell and is electrically connected with the cabin shell; the equipotential cage is annularly arranged on the inner wall of the cabin shell, and the equipotential cage is connected with the hub through the first carbon brush device; the equipotential cage is connected with the grounding busbar through the second carbon brush device, the grounding busbar is sleeved outside the tower barrel, and the gear box and the generator are connected with the grounding busbar through the grounding cable.

Preferably, the equipotential cage is formed by winding a copper wire, and the connection position of the equipotential cage is fastened through a bolt.

Further preferably, a through pipe is coaxially arranged outside the copper wire, and the copper wire is attached to the shell of the engine room.

Preferably, the first carbon brush device comprises a first carbon brush, a first carbon brush support and a first current collecting claw, the first carbon brush is fixedly connected with the first current collecting claw, the first current collecting claw is connected with the first carbon brush support in a sliding mode, and the first carbon brush support is installed on the engine room shell.

Preferably, one end of the first carbon brush is connected with the equipotential cage through a copper wire, and the other end of the first carbon brush is abutted to the flange of the wheel hub.

Preferably, the second carbon brush device comprises a second carbon brush, a second carbon brush support and a second current collecting claw, the second carbon brush is fixedly connected with the top end of the second current collecting claw, the second current collecting claw is connected with the second carbon brush support in a sliding mode, and the second carbon brush support is mounted on the engine room shell.

Preferably, one end of the second carbon brush is connected with the equipotential cage through a copper wire, and the other end of the second carbon brush is abutted to the grounding busbar.

Preferably, the grounding busbar is connected with the gear box through a grounding cable, and the grounding busbar is connected with the generator through two grounding cables.

Further preferably, the grounding busbar is connected with the cabin control cabinet through a cable.

The utility model has the advantages that:

the utility model discloses a set up the lightning protection arrester on the cabin shell, avoid the thunderbolt as protection anemometer and wind indicator to avoid the thunderbolt, pass through earthing cable with the lightning current to cabin upper platform under the condition that suffers the thunderbolt, avoid the lightning current along transmission system's conduction. The lightning current of the nacelle shell mainly comes from the leakage lightning current of the hub blades and the leakage lightning current of the lightning receptor at the top of the wind vane, so that the nacelle cover is designed into an equipotential cage. Inside the cabin, become complete equipotential cage with cabin, tower section of thick bamboo global design, belong to the clean area of electromagnetism in the equipotential cage, can effectively shield the circuit thunder and lightning interference that thunder and lightning electromagnetic pulse arouses. The grounding busbar is sleeved at the joint of the tower barrel and the engine room shell, lightning received by the equipotential cage is conducted to the grounding busbar, and then the grounding busbar conducts the lightning to the ground through the tower barrel, so that the lightning protection purpose of the engine room group is achieved.

Drawings

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

Fig. 1 is an internal cross-sectional view of a nacelle of a wind turbine generator system nacelle cover lightning protection system of the present invention;

fig. 2 is a schematic structural diagram of a first carbon brush device of the lightning protection system for the nacelle cover of the wind generating set of the present invention;

fig. 3 is a schematic structural diagram of an equipotential cage of the lightning protection system for the nacelle cover of the wind turbine generator system of the present invention;

fig. 4 is a schematic structural diagram of a second carbon brush device of the lightning protection system for the nacelle cover of the wind turbine generator system of the present invention.

Description of the reference numerals

100. A nacelle cover; 110. a gear case; 120. a generator; 200. a hub; 300. A tower drum;

10. a lightning arrester; 11. a ground cable; 20. an equipotential cage; 40. A first carbon brush device;

41. a first carbon brush; 42. a first carbon brush holder; 43. A first current collecting claw; 50. a grounding busbar;

60. a second carbon brush device; 61. a first carbon brush; 62. a second carbon brush holder;

63. and a second current collecting claw.

Detailed Description

The technical solution in the embodiment of the present invention is clearly and completely described below with reference to the drawings in the embodiment of the present invention. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be implemented in other ways different from the specific details set forth herein, and one skilled in the art may similarly generalize the present invention without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.

As shown in fig. 1, the utility model provides a wind generating set cabin cover lightning protection system, aerogenerator's cabin includes cabin shell 100, installs gear box 110, generator 120 and cabin switch board (not shown in the figure) in the cabin, installs wheel hub 200 in one side of cabin, installs the blade on wheel hub 200 (not shown in the figure). In which wind blows blades to rotate the hub 200, the hub 200 then drives the gearbox 110 to rotate through a main shaft (not shown), the gearbox 110 drives the generator 120 to rotate through a high speed shaft (not shown), and the generator 120 converts the wind into electricity, which is then transmitted to the grid through wires. In addition, a cabin control cabinet (not shown) is provided within the cabin for housing associated control devices.

In this embodiment, as shown in fig. 1, a lightning protection system for a generator set is installed in the nacelle to protect various devices in the nacelle from being damaged by lightning. Specifically, the lightning protection system includes a lightning protection lightning receptor 10, an equipotential cage 20, and a grounding bus 50, and in this embodiment, the grounding bus 50 is a thick cable. The lightning protection lightning receptor 10 is disposed at the rear of the nacelle housing 100 and is connected to the upper platform of the nacelle housing 100 through the grounding cable 11, that is, the lightning protection lightning receptor 10 conducts the received lightning current to the nacelle housing 100 through the grounding cable 11.

The equipotential cage ring 20 is established on the inner wall of cabin shell 100, and the equipotential cage 20 is connected with wheel hub 200 through first carbon brush device 40 to receive the lightning current on the wheel hub 200 (the current mainly derives from the conduction of the electric current of blade on wheel hub 200, installs the conduction scheme of thunder and lightning on the blade, has the lightning current conduction of a plurality of schemes in order to solve the blade among the prior art, consequently, in the utility model discloses no longer detailed description. Since the lightning current of the nacelle housing 100 mainly comes from the leakage lightning current of the hub 200 and the leakage lightning current of the lightning arrester 10 on the top of the wind vane, in order to make the nacelle housing 100 a faraday cage, it is necessary to make the inside of the nacelle housing an equipotential cage 20. In the present embodiment, the equipotential cage 20 adopts 70 mm copper wires for winding, and is attached and mounted on the inner wall of the nacelle shell to form an annular cage-shaped region (as shown in fig. 3). The first carbon brush device 40 is connected to the hub 200, the second carbon brush device 60 is connected to the ground busbar 50 on the tower 300, the ground busbar 50 is used for transmitting the lightning current to the tower 300, and the tower 300 transmits the lightning current to the ground. Wherein the copper wires are laid on the inner wall of the entire nacelle cover 100 in a form of a through pipe. At the joints (i.e., since the equipotential cage 20 is made of copper wires by winding, there are a plurality of joints on the equipotential cage 20, and these joints form respective nodes), in order to prevent the displacement and deformation of the respective joints, copper wires in different directions are fastened together and fixed to the nacelle cover 100 by bolts (not shown). The wind turbine generator system lightning protection system adopts an equipotential protection principle, the engine room and the tower 300 are integrally designed into a complete equipotential cage, and the inside of the equipotential cage belongs to an electromagnetic clean area, so that the line lightning interference caused by lightning electromagnetic pulses can be effectively shielded.

Specifically, in the present embodiment, as shown in fig. 2, the first carbon brush device 40 includes a first carbon brush 41, a first carbon brush holder 42, and a first current collecting claw 43, the first carbon brush 41 is fixedly connected to the first current collecting claw 43, the first current collecting claw 43 is slidably connected to the first carbon brush holder 42, and the first carbon brush holder 42 is mounted on the nacelle cover 100. In addition, when the wheel hub is installed, the first carbon brush 41 exceeds the first current collecting claw 43 by a certain length, so that one end of the first carbon brush 41 is in contact with the flange of the wheel hub 200, and the other end of the first carbon brush 41 is connected with the equipotential cage 20 through a copper wire.

In addition, in this embodiment, as shown in fig. 4, the second carbon brush device 60 and the first carbon brush device 40 have the same mounting structure, and the structure of the second carbon brush device 60 refers to the structure of the first carbon brush device 40. Specifically, the second carbon brush device 60 includes a second carbon brush 61, a second carbon brush holder 62, and a second current collecting claw 63, where the second carbon brush 61 is fixedly connected to the second current collecting claw 63, the second current collecting claw 63 is slidably connected to the second carbon brush holder 62, and the second carbon brush holder 62 is mounted on the nacelle cover. In this embodiment, one end of the second carbon brush apparatus 60 is connected to the equipotential cage through a copper wire, and the other end of the second carbon brush is abutted to the grounding busbar 50.

In addition, the complete equipotential measure can effectively suppress the system overvoltage caused by the ground potential counterattack, so that the gear box 110, the generator 120 and the unit control cabinet in the cabin are all well grounded. Specifically, the generator 120 adopts 2 grounding cables, preferably, 70 mm grounding cables connected to the cabin grounding busbar; the gearbox 110 adopts 1 grounding cable, preferably a 70 mm grounding cable, connected to the cabin grounding busbar; for the cabin control cabinet, the grounding busbar is connected by a cable, preferably, the grounding busbar 50 is connected by a 16mm cable.

It is obvious that the described embodiments are only some of the embodiments of the present invention, and not all of them. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Claims

1. The utility model provides a wind generating set cabin cover lightning protection system which characterized in that includes:

the lightning protection lightning arrester is arranged at the tail part of the cabin shell and is electrically connected with the cabin shell;

the electric motor comprises an electric motor, a first carbon brush device, an electric motor, a second carbon brush device, an electric motor, a first electric motor and a second electric motor, wherein the electric motor is arranged on the inner wall of the cabin shell;

the electric generator comprises a grounding busbar, an equipotential cage is connected with the grounding busbar through a second carbon brush device, the grounding busbar is sleeved outside a tower barrel, and a gear box and the generator are connected with the grounding busbar through a grounding cable.

2. The lightning protection system for the hood of the wind generating set according to claim 1, wherein the equipotential cage is formed by winding copper wires, and the connection position of the equipotential cage is fastened through bolts.

3. The wind generating set nacelle cover lightning protection system of claim 2, wherein a penetration pipe is arranged outside the copper wire, and the copper wire is attached to the nacelle cover.

4. The lightning protection system for the nacelle cover of the wind generating set according to claim 1, wherein the first carbon brush device comprises a first carbon brush, a first carbon brush support and a first current collecting claw, the first carbon brush is fixedly connected with the first current collecting claw, the first current collecting claw is slidably connected with the first carbon brush support, and the first carbon brush support is mounted on a nacelle shell.

5. The lightning protection system for the nacelle cover of the wind generating set according to claim 1, wherein one end of the first carbon brush is connected to the equipotential cage through a copper wire, and the other end of the first carbon brush abuts against a flange of the hub.

6. The lightning protection system for the nacelle cover of the wind generating set according to claim 1, wherein the second carbon brush device comprises a second carbon brush, a second carbon brush support and a second current collecting claw, the second carbon brush is fixedly connected with the top end of the second current collecting claw, the second current collecting claw is slidably connected with the second carbon brush support, and the second carbon brush support is mounted on the nacelle shell.

7. The lightning protection system for the hood of the wind generating set according to claim 6, wherein one end of the second carbon brush is connected with the equipotential cage through a copper wire, and the other end of the second carbon brush is abutted against the grounding busbar.

8. The lightning protection system for the hood of the wind generating set according to claim 1, wherein the grounding busbar is connected with the gear box through one grounding cable, and the grounding busbar is connected with the generator through two grounding cables.

9. The wind generating set nacelle cover lightning protection system of claim 8, wherein the ground busbar is connected to the nacelle control cabinet by a cable.