CN204632938U - A kind of arm of many diffusings for Wind turbines earthing device - Google Patents

Abstract

A multi-scattering arm grounding device for wind turbines, including a ring-shaped grounding body, passing through the center of the ring-shaped grounding body, connecting electrodes are provided to connect with the ring electrodes, and the midpoint of the connecting electrodes is provided with a vertically downward vertical grounding body; 4 horizontal ray electrodes are connected to the annular grounding body, and 3 outgoing terminal electrodes are arranged on the horizontal ray electrode; the annular grounding body, horizontal ray electrodes, and outgoing terminal electrodes are located on the same plane. The utility model has a small volume and is convenient for construction and installation. A vertical grounding body is arranged on the connecting electrode of the annular grounding body to speed up the flow. The spark effect in the process of dispersing the flow can reduce the impact grounding resistance of the wind turbine and improve the lightning protection level of the wind turbine.

Description

A multi-diffuse arm grounding device for wind turbines

technical field

The utility model relates to the technical field of electrical grounding, in particular to a multi-diffuse arm grounding device for wind turbines.

Background technique

In the construction of wind farms, the wind turbines should be connected to the grounding device through the grounding down conductor, and the grounding device should be buried below the ground surface. The grounding resistance of the grounding device directly affects the lightning protection level of the wind turbine. The acceptance of the grounding device is still Whether the power frequency grounding resistance is qualified or not is the only criterion, but under the action of high-frequency and large-scale lightning current, spark effects and inductance effects will occur during the leakage current of the ground grid. At this time, the power frequency characteristics cannot truly reflect the grounding device The lightning protection effect needs to consider the impact characteristics of the grounding electrode. In areas with high soil resistivity, the current dissipating ability is poor, and the impact grounding resistance is high, which poses a threat to the normal operation of the wind farm and the personal safety of the staff. The utility model proposes a multi-diffusion arm grounding electrode layout structure for wind turbines. By rearranging the grounding electrode structure, the speed of current dispersion is accelerated, and the impact dispersion capacity of the grounding device is promoted to reduce the impact grounding impedance. the goal of. The Chinese patent "Vertical Multilayer Composite Lightning Protection Grounding Device for Wind Turbine Units (CN202495578U)" provides a grounding device composed of multiple single-layer horizontal grounding conductors and vertical grounding conductors. The structure is simple, but its resistance reduction effect is not obvious. The Chinese patent "Grounding Body for Reducing Grounding Resistance of Wind Turbine Generators (CN202523855U)" provides a steel cage grounding body, which has an obvious effect of reducing resistance, but the grounding device is large in size and complex in structure, which is not convenient for construction and installation.

Since wind turbines are usually built in the wilderness, high mountains, and beaches, the soil resistivity in these areas is relatively high, and the grounding resistance of wind turbines is difficult to meet the design requirements. Measures to reduce resistance need to be taken. Traditional methods for reducing resistance include: The typhoons are interconnected into a network, soil is replaced, external grounding is introduced, chemical resistance reducing agents are used, and grounding modules are used. However, these methods always have some disadvantages, such as polluting the soil, causing damage to the ecological environment, or occupying a large area of land, or the effect of reducing resistance is not obvious and unstable, which not only increases the amount of engineering, but also increases the construction cost. .

Utility model content

The technical problem to be solved by the utility model is to provide a multi-spread arm grounding device for wind turbines in view of the deficiencies of the above-mentioned prior art.

In order to achieve the above object, the technical solution of the utility model is: a multi-diffuse arm grounding device for wind turbines, including a ring-shaped grounding body, passing through the center of the ring-shaped grounding body, connecting electrodes are provided to connect with the ring electrodes, connected The midpoint of the electrode is provided with a vertical grounding body vertically downward; 4 horizontal ray electrodes are connected to the ring-shaped grounding body, and 3 outgoing terminal electrodes are arranged on the horizontal ray electrode; the ring-shaped grounding body, the horizontal ray electrode, The outlet terminal electrodes are located on the same plane.

The included angle between the horizontal ray electrodes is 90 degrees, so that the horizontal ray electrodes are evenly distributed.

The length of the outlet end is 0.8m to 2m.

The ratio of the connecting electrode, the horizontal ray electrode, and the vertical grounding body is 3:7:1.

The electrode at the end of the outgoing line is located at 1/4 of the horizontal ray electrode close to the annular grounding body.

With the above structure, the utility model has a small volume and is convenient for construction and installation. A vertical grounding body is arranged on the connecting electrode of the annular grounding body to speed up the flow. The strength of the electric field can promote the spark effect in the process of scattering, achieve the purpose of reducing the impact grounding resistance of the wind turbine, and improve the lightning protection level of the wind turbine.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the utility model is further described:

Fig. 1 is the structural representation of the utility model;

In the figure: annular grounding body 1, horizontal ray electrode 2, outlet terminal electrode 3, connecting electrode 4, and vertical grounding body 5.

Detailed ways

As shown in Figure 1, a multi-diffuse arm grounding device for wind turbines includes a ring-shaped grounding body 1, passing through the center of the ring-shaped grounding body 1, a connection electrode 4 is connected to the ring electrode 1, and the connection electrode 4 A vertical grounding body 5 vertically downward is provided at the midpoint; four horizontal ray electrodes 2 are connected to the annular grounding body 1, and three outlet terminal electrodes 3 are arranged on the horizontal ray electrode 2; the annular grounding body 1, The horizontal ray electrode 2 and the outlet terminal electrode 3 are located on the same plane.

The angle between the horizontal ray electrodes 2 is 90 degrees, so that the horizontal ray electrodes 2 are evenly distributed.

The length of the outlet terminal 3 is 0.8m to 2m.

The ratio of the lengths of the connection electrode 4 , the horizontal ray electrode 2 , and the vertical grounding body 5 is 3:7:1.

The outgoing line terminal electrode 3 is arranged on the horizontal ray electrode 2 at 1/4 of the annular grounding body 1 .

With the above structure, the utility model has a small volume and is convenient for construction and installation. A vertical grounding body is arranged on the connecting electrode of the annular grounding body, which speeds up the scattered flow. The strength of the electric field can promote the spark effect in the process of scattering, achieve the purpose of reducing the impact grounding resistance of the wind turbine, and improve the lightning protection level of the wind turbine.

Claims (4)

1. the many diffusings arm earthing device for Wind turbines, comprise Ring earth electrode (1), it is characterized in that: the center crossing Ring earth electrode (1), be provided with connecting electrode (4) to be connected with annular electrode (1), the midpoint of connecting electrode (4) is provided with Grounding Grids (5) vertically downward; Ring earth electrode (1) is connected with 4 horizontal rays electrodes (2), horizontal rays electrode (2) is provided with 3 wire outlet end electrodes (3); Described Ring earth electrode (1), horizontal rays electrode (2), wire outlet end electrode (3) are in the same plane.

2. a kind of arm of many diffusings for Wind turbines earthing device according to claim 1, is characterized in that: the angle between described horizontal rays electrode (2) is 90 degree.

3. a kind of arm of many diffusings for Wind turbines earthing device according to claim 1, is characterized in that: the length of described wire outlet end (3) is 0.8m to 2m.

4. a kind of arm of many diffusings for Wind turbines earthing device according to claim 1, is characterized in that: the length ratio of described connecting electrode (4), horizontal rays electrode (2), Grounding Grids (5) is 3:7:1.