CN212366239U

CN212366239U - Grounding device for wind generating set

Info

Publication number: CN212366239U
Application number: CN202021101350.4U
Authority: CN
Inventors: 张青云
Original assignee: Cgn Beijing New Energy Technology Co ltd
Current assignee: Cgn Beijing New Energy Technology Co ltd
Priority date: 2020-06-15
Filing date: 2020-06-15
Publication date: 2021-01-15
Anticipated expiration: 2030-06-15

Abstract

The utility model provides a wind generating set uses earthing device, including the ground connection main part, the ground connection main part is cyclic annular setting or rectangle base setting, specifically can set up according to unidimensional fan base not, and the top fixedly connected with limiting plate of ground connection main part, the top of ground connection main part are connected with the connecting electrode, and the outer end position fixedly connected with Y type connecting electrode of connecting electrode. When installing outside fan, and the limiting plate that grounding body top dislocation set up supports the connection to the fan base, through connecting electrode, Y type connecting electrode and first telluric electricity field, the free stream of electric current has been increased, the increase decline speed of electric current is accelerated, and increased the distance between the adjacent electrode, the shielding effect between the adjacent conductor has been reduced, thereby promote free stream, on the other hand simultaneously, through Y type connecting electrode distortion earthing device's local electric field, reinforcing spark ionization effect promotes tip free stream.

Description

Grounding device for wind generating set

Technical Field

The utility model relates to a aerogenerator technical field, more specifically the theory relates to a earthing device for wind generating set.

Background

In the lightning protection grounding engineering of a wind power generation field, a grounding device for discharging lightning current is usually arranged, and as most of underground parts of the wind power generation field are rocks, the soil resistance is high, the grounding devices of a plurality of wind power generators are generally required to be connected with each other to improve the effect of discharging current, and the grounding requirement is met. Along with the increase of the single machine capacity of the wind turbine generator and the increase of the machine body height, the interval distance of the wind turbine generator in the wind power plant is larger and larger, so that the cost of interconnecting the grounding devices of each wind turbine generator into a net is higher and higher.

The lightning protection of the wind generating set mainly considers two aspects: the nacelle and the blade are the two parts. The lightning protection of the engine room is realized by arranging a lightning rod at the rear end of the shell of the engine room and grounding the shell of the engine room and a tower drum through a steel shell. Lightning protection of blades is mainly characterized in that lightning receptors are arranged on two sides of the blades and connected with a conduction system, lightning current is led to the blades in a controlled mode and enters the ground through a tower barrel, so that the blades are protected, a generator in a cabin is connected with a grounding device of a wind driven generator by using a special grounding cable, and other components in the cabin are directly connected with a cabin base. In consideration of guaranteeing normal safe operation of the wind turbine generator and personal safety of workers, the grounding resistance of the wind turbine generator is generally smaller than 4 ohms, the grounding resistance of the grounding device directly influences the lightning protection level of the wind turbine generator, the acceptance of the grounding device still takes the power frequency grounding resistance as the only standard, however, under the action of high-frequency and large-amplitude lightning current, spark effect and inductance effect can be generated in the process of ground grid leakage current, the lightning protection effect of the grounding device cannot be truly reflected by the power frequency characteristic at the moment, and the impact characteristic of a grounding electrode needs to be considered. In areas with high soil resistivity, the current dispersion capability is poor, the impulse grounding resistance is high, and the threat to the normal safe operation of a wind power generation field and the personal safety of workers is caused.

The Chinese patent 'wind turbine generator vertical multilayer composite lightning protection grounding device (CN 202495578U)' provides a grounding device consisting of a plurality of single-layer horizontal grounding conductors and vertical grounding conductors, and has obvious resistance reduction effect, but the structure is relatively complex.

The Chinese patent 'grounding body (CN202523855U) for reducing the grounding resistance of the wind driven generator' provides a steel reinforcement cage grounding body, the resistance reduction effect is obvious, but the grounding device has larger volume and complex structure, and is not convenient for construction and installation.

In the construction of wind power generation field, can set up the earthing device of the lightning current of releasing usually, traditional wind generating set earthing device is generally horizontal circular, and only adopts circularly, and area is big, and the construction degree of difficulty is high, and ground resistance is high, can't satisfy wind generating set to the ground resistance requirement. In order to reduce the ground resistance of the wind turbine generator, the measures generally adopted include interconnection of a plurality of wind turbine generator grounding devices, grounding modules, enlargement of the area of a ground grid, external grounding introduction and the like to reduce the ground resistance. However, in the actual construction process, along with the increase of the single-machine capacity and the increase of the height of the machine body of the wind turbine generator, the interval distance of the wind turbine generator in the wind turbine generator field is larger and larger, so that the cost of interconnecting the grounding devices of each wind turbine generator into a network is higher and higher, and the grounding project is often limited by the grounding area, and the grounding resistance cannot be reduced by methods of enlarging the grounding network area, leading out the ground and the like.

SUMMERY OF THE UTILITY MODEL

The utility model discloses earthing device for wind generating set's purpose and efficiency are reached by following specific technological means:

the utility model provides a earthing device for wind generating set, including the ground connection main part, the ground connection main part is cyclic annular setting or rectangular base setting, specifically can set up according to not unidimensional fan base, the top fixedly connected with limiting plate of ground connection main part, the top of ground connection main part is connected with the connecting electrode, the outer end position fixedly connected with Y type connecting electrode of connecting electrode, the first telluric electricity field of bottom position fixedly connected with of Y type connecting electrode, the fixed surface of connecting electrode is connected with the backup pad, the fixed surface of ground connection main part is connected with the outer panel, the bottom position fixedly connected with second telluric electricity field of outer panel, the inboard position fixedly connected with interior plate of ground connection main part, the bottom fixedly connected with third telluric electricity field.

Further preferred embodiments: the limiting plates are arranged in an arc shape, the number of the limiting plates is four, and the limiting plates are located at the edge position of the top end of the grounding main body.

Further preferred embodiments: the limiting plate occupies a half position of the top edge of the grounding body.

Further preferred embodiments: the top position of connecting electrode at the ground connection main part sets up two sets ofly, is the crisscross setting, and the top border position of ground connection main part corresponds connecting electrode and sets up the opening.

Further preferred embodiments: the front end of the Y-shaped connecting electrode is in a split arrangement, and the Y-shaped connecting electrode and the connecting electrode are in spiral sleeve joint.

Further preferred embodiments: every group of first grounding electrode is provided with two, and the first grounding electrode is fixedly connected to the bottom of the front end opening of the Y-shaped connecting electrode.

Further preferred embodiments: the backup pad is circular setting, and the backup pad sets up as supporting platform.

Further preferred embodiments: the outer plate is arranged at the bottom position of the connection electrode and supports the connection electrode.

Further preferred embodiments: the second grounding electrode is vertically arranged, and the third grounding electrode is arranged corresponding to the bottom position of the limiting plate.

Has the advantages that:

this kind of earthing device for wind generating set when installing outside fan, supports the connection with the limiting plate that earthing main part top edge straggly set up the fan base.

Through the connecting electrode, the Y-shaped connecting electrode and the first grounding electrode, the current dispersion is increased when the grounding device is used, the increasing and decreasing speed of the current is accelerated, the distance between the adjacent electrodes is increased, and the shielding effect between the adjacent conductors is reduced, so that the current dispersion is promoted.

When the fan is installed, the supporting plate supports the fan.

The second grounding electrode and the third grounding electrode are arranged in a matched mode, and current borne by the grounding main body is dispersed when the device is fixed.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention.

Fig. 2 is a top view of the grounding main body structure of the present invention.

In FIGS. 1-2: the grounding body 1, the limiting plate 2, the connecting electrode 3, the Y-shaped connecting electrode 4, the first grounding electrode 5, the supporting plate 6, the outer plate 7, the second grounding electrode 8, the inner measuring plate 9 and the third grounding electrode 10.

Detailed Description

As shown in figures 1 to 2:

the utility model provides a earthing device for wind generating set, including ground connection main part 1, ground connection main part 1 is cyclic annular setting or rectangular base setting, specifically can set up according to unidimensional fan base not, ground connection main part 1's top fixedly connected with limiting plate 2, ground connection main part 1's top is connected with connecting electrode 3, connecting electrode 3's outer end position fixedly connected with Y type connecting electrode 4, Y type connecting electrode 4's bottom position fixedly connected with first telluric electricity field 5, connecting electrode 3's fixed surface is connected with backup pad 6, ground connection main part 1's fixed surface is connected with outer panel 7, outer panel 7's bottom position fixedly connected with second telluric electricity field 8, ground connection main part 1's inboard fixed surface is connected with interior plate 9, interior plate 9's bottom fixedly connected with third telluric electricity field 10.

The four limit plates 2 are arranged in an arc shape, and the limit plates 2 are located at the edge of the top end of the grounding main body 1.

Wherein, limiting plate 2 occupies the half position at 1 top edge of ground connection main part, when installing outside fan, supports the connection with the limiting plate 2 of 1 top edge straggly setting of ground connection main part to the fan base.

Wherein, connecting electrode 3 sets up two sets ofly at the top position of grounding body 1, is the crisscross setting, and the top edge position of grounding body 1 corresponds connecting electrode 3 and sets up the opening.

Wherein, Y type connecting electrode 4 front end is the jag setting, and Y type connecting electrode 4 and connecting electrode 3 spiral cover simultaneously cup joints.

Wherein, first telluric electricity field 5 every group sets up two, fixed connection is in Y type connecting electrode 4 front end opening bottom, through connecting electrode 3, Y type connecting electrode 4 and the first telluric electricity field 5 who sets up, increased the free stream of electric current when using, the increase decline speed of electric current is accelerated, and increased the distance between the adjacent electrode, the shielding effect between the adjacent conductor has been reduced to promote the free stream, on the other hand simultaneously, through Y type connecting electrode 4's existence, distorted earthing device's local electric field, reinforcing spark ionization effect, promote tip free stream.

Wherein, backup pad 6 is circular setting, and backup pad 6 sets up as supporting platform, and when installing the fan, backup pad 6 supports it.

The outer plate 7 is disposed at the bottom of the connection electrode 3 and supports the connection electrode 3.

Wherein, second telluric electricity field 8 is perpendicular setting, and third telluric electricity field 10 corresponds the bottom position setting of limiting plate 2 simultaneously, and second telluric electricity field 8 and the supporting setting of third telluric electricity field 10 are being dispersed the electric current that the grounding body 1 received simultaneously when will this device is fixed.

The working principle is as follows:

the concrete using mode and function of the embodiment, when in use, the grounding main body 1 of the device is connected with the external wind driven generator main body, the fan is supported by the upward convex support plate 6, after the device and the fan are installed, the device and the fan are buried under the ground surface, the second ground electrode 8 and the third ground electrode 10 are embedded in the ground to fix the device, and when a lightning strike happens, because the device is provided with a plurality of ground electrode structures, when being struck by lightning, equivalently, a current dispersion channel is additionally arranged, the increasing and decreasing speed of current is accelerated, the diffusion of homopolar current in soil is promoted, the current dispersion resistance is reduced, the spark ionization effect is enhanced, the effective length of a grounding electrode structure is increased, the spark effect in the current dispersion process is promoted, therefore, the aim of reducing the impulse grounding resistance of the wind turbine generator is achieved, and the lightning protection level of the wind turbine generator is improved.

Claims

1. The utility model provides a earthing device for wind generating set, includes ground connection main part (1), ground connection main part (1) are cyclic annular setting or rectangle base setting, specifically can set up its characterized in that according to not unidimensional fan base: the top fixedly connected with limiting plate (2) of ground connection main part (1), the top of ground connection main part (1) is connected with joint electrode (3), the outer end position fixedly connected with Y type joint electrode (4) of joint electrode (3), the first telluric electricity field of bottom position fixedly connected with (5) of Y type joint electrode (4), the fixed surface of joint electrode (3) is connected with backup pad (6), the fixed surface of ground connection main part (1) is connected with outer panel (7), the bottom position fixedly connected with second telluric electricity field (8) of outer panel (7), the inboard position fixedly connected with inside plate (9) of ground connection main part (1), the bottom fixedly connected with third telluric electricity field (10) of inside plate (9).

2. The grounding device for a wind generating set according to claim 1, wherein: the limiting plates (2) are arranged in an arc shape, the number of the limiting plates is four, and the limiting plates (2) are located at the edge position of the top end of the grounding main body (1).

3. The grounding device for a wind turbine generator set according to any one of claims 1 or 2, wherein: two of the limit plates (2) occupy half of the top edge of the grounding body (1).

4. The grounding device for a wind generating set according to claim 1, wherein: the top end position of connecting electrode (3) at ground connection main part (1) sets up two sets ofly, is the crisscross setting, and the top edge position of ground connection main part (1) corresponds connecting electrode (3) and sets up the opening.

5. The grounding device for a wind generating set according to claim 1, wherein: the front end of the Y-shaped connecting electrode (4) is in a split arrangement, and the Y-shaped connecting electrode (4) and the connecting electrode (3) are in spiral sleeve connection.

6. The grounding device for a wind generating set according to claim 1, wherein: two first grounding electrodes (5) are arranged in each group and fixedly connected to the bottom of the front end opening of the Y-shaped connecting electrode (4).

7. The grounding device for a wind generating set according to claim 1, wherein: the supporting plate (6) is arranged in a circular shape, and the supporting plate (6) is arranged as a supporting platform.

8. The grounding device for a wind generating set according to claim 1, wherein: the outer side plate (7) is arranged at the bottom position of the connecting electrode (3) and supports the connecting electrode (3).

9. The grounding device for a wind generating set according to claim 1, wherein: the second grounding electrode (8) is vertically arranged, and the third grounding electrode (10) is arranged at the bottom position corresponding to the limiting plate (2) at the same time.