CN204696253U - A kind of possess the earthing device reducing Transient grounding resistance - Google Patents

Abstract

A kind of possess the earthing device reducing Transient grounding resistance, comprise regular hexagon earth electrode, horizontal rays electrode, it is characterized in that: six summits of regular hexagon earth electrode are fixedly connected with horizontal rays electrode, and horizontal rays electrode and regular hexagon earth electrode are in same level.The utility model structure is simple, easy construction, excellent performance, by connecting electrode on horizontal rays electrode, improve the impact characteristics of earthing device, improve earthing device and impact diffusing ability, strengthen spark effect, reach the object reducing Wind turbines centralized earthing device Transient grounding resistance, improve the lightning protection level of Wind turbines.

Description

A grounding device with reduced impact grounding impedance

technical field

The utility model relates to the technical field of electrical grounding, in particular to a grounding device capable of reducing impact grounding impedance.

Background technique

The impact grounding impedance of centralized grounding devices for wind turbines is an important parameter in the lightning protection grounding design of wind farms. Reducing the impact grounding impedance of centralized grounding devices for wind turbines can significantly improve the lightning protection level of wind turbines. In order to obtain more wind energy, wind turbines are usually built in the wilderness, high mountains, and beaches. The soil resistivity in these areas is high. Under high soil resistivity, the impact grounding impedance of the wind turbine centralized grounding device is relatively high. Existing The resistance reduction effect of wind turbines is not obvious, and the lightning protection level of wind turbines is low.

In order to ensure the normal operation of wind turbines and the personal safety of staff, the requirements for lightning protection of wind turbines are getting higher and higher. In order to improve the lightning protection level of wind turbines, grounding devices are usually arranged. When the wind turbine is struck by lightning, the lightning current flows into the ground through the centralized grounding device. Under the action of the lightning current, the impact grounding impedance value of the centralized grounding device of the wind turbine has a direct impact on the lightning protection performance of the wind turbine. In areas with high soil resistivity, the ability to dissipate lightning current is poor, and the impact grounding impedance value is high, which poses a threat to the normal operation of the wind farm and the personal safety of the staff.

The Chinese patent "Vertical Multilayer Composite Lightning Protection Grounding Device for Wind Turbines (CN202495578U)" provides a grounding device composed of multiple single-layer horizontal grounding conductors and vertical grounding conductors. complex.

The Chinese patent "Wind Power Generator Welding Grounding Device (CN202103173)" proposes a good contact between the grounding device and the tower to improve the conductive quality of the grounding, but its resistance reduction effect is not very obvious.

In the actual lightning protection grounding project, to reduce the grounding impedance of the centralized grounding device of wind turbines, the main measures usually adopted include increasing the size of the grounding body, using natural grounding bodies, local soil replacement, deep buried grounding, and the use of resistance reducing agents. to reduce ground impedance. However, these methods have problems such as complex structure, low reliability and high cost in practical engineering applications.

Utility model content

The technical problem to be solved by the utility model is to provide a grounding device capable of reducing the impact grounding impedance in view of the deficiencies of the above-mentioned prior art.

In order to achieve the above purpose, the technical solution of the utility model is: a grounding device with reduced impact grounding impedance, including a regular hexagonal grounding body and a horizontal ray electrode, characterized in that: six vertices of the regular hexagonal grounding body are fixed A horizontal ray electrode is connected, and the horizontal ray electrode is on the same level as the regular hexagonal grounding body.

Two bifurcated electrodes are arranged on the horizontal ray electrode.

The bifurcated electrodes are on the same level as the regular hexagonal grounding body, and the angle between the bifurcated electrodes and the horizontal ray electrodes is 60 degrees.

The horizontal ray electrodes are provided with vertical electrodes.

The vertical electrodes are on the same horizontal plane as the regular hexagonal grounding body, and the midpoints of the vertical electrodes are set on the horizontal ray electrodes and are perpendicular to the horizontal ray electrodes.

The ratio of the side length of the regular hexagonal grounding body 1 to the length of the horizontal ray electrode 2 is 1/4~1/2, which reduces the inductance effect of the conductor itself and maximizes the length of the conductor, so that the regular hexagon and the ray electrode The length ratio is optimized.

The bifurcated electrodes are connected at a distance of 1.2d from the intersection of the regular hexagonal grounding body and the horizontal ray electrode, where d is the side length of the regular hexagonal grounding body, which reduces the shielding effect of the bifurcated electrodes 3 and the regular hexagonal grounding body.

The vertical electrode is connected at a distance of 1.2d from the intersection of the regular hexagonal grounding body and the horizontal ray electrode, where d is the side length of the regular hexagonal grounding body, which reduces the shielding effect of the vertical electrode and the regular hexagonal grounding body.

With the above structure, the utility model has the advantages of simple structure, convenient construction and excellent performance. By connecting the electrodes on the horizontal ray electrodes, the impact characteristics of the grounding device can be improved, the impact dispersion capacity of the grounding device can be improved, and the spark effect can be enhanced to reduce the centralized grounding of wind turbines. The purpose of the device to impact the grounding impedance is to 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;

Fig. 2 is a structural schematic diagram using vertical electrodes;

In the figure: a regular hexagonal grounding body 1, a horizontal ray electrode 2, a bifurcated electrode 3, and a vertical electrode 4.

Detailed ways

Example 1:

As shown in Figure 1, a grounding device with reduced impact grounding impedance includes a regular hexagonal grounding body 1 and a horizontal ray electrode 2, and is characterized in that six vertices of the regular hexagonal grounding body 1 are fixedly connected with horizontal ray electrodes The electrode 2, the horizontal ray electrode 2 and the regular hexagonal grounding body 1 are on the same level.

Two bifurcated electrodes 3 are arranged on the horizontal ray electrode 2 .

The bifurcated electrode 3 is on the same level as the regular hexagonal grounding body 1 , and the angle between the bifurcated electrode 3 and the horizontal ray electrode is 60 degrees.

The ratio of the side length of the regular hexagonal grounding body 1 to the length of the horizontal ray electrode 2 is 1/4~1/2, which reduces the inductance effect of the conductor itself and maximizes the length of the conductor, so that the regular hexagon and the ray electrode The length ratio is optimized.

The bifurcated electrodes 3 are connected at a distance of 1.2d from the intersection of the regular hexagonal grounding body 1 and the horizontal ray electrode 2, where d is the side length of the regular hexagonal grounding body 1, reducing the distance between the bifurcated electrodes 3 and the regular hexagonal grounding body. 1 shielding effect.

Example 2:

As shown in Figure 2, a grounding device with reduced impact grounding impedance includes a regular hexagonal grounding body 1 and a horizontal ray electrode 2, and is characterized in that six vertices of the regular hexagonal grounding body 1 are fixedly connected with horizontal ray electrodes The electrode 2, the horizontal ray electrode 2 and the regular hexagonal grounding body 1 are on the same level.

The horizontal ray electrode 2 is provided with a vertical electrode 4 .

The vertical electrode 4 is on the same horizontal plane as the regular hexagonal grounding body 1 , and the midpoint of the vertical electrode 4 is set on the horizontal ray electrode 2 and is perpendicular to the horizontal ray electrode 2 .

The ratio of the side length of the regular hexagonal grounding body 1 to the length of the horizontal ray electrode 2 is 1/4~1/2, which reduces the inductance effect of the conductor itself and maximizes the length of the conductor, so that the regular hexagon and the ray electrode The length ratio is optimized.

The vertical electrode 4 is connected at a distance of 1.2d from the intersection of the regular hexagonal grounding body 1 and the horizontal ray electrode 2, where d is the side length of the regular hexagonal grounding body 1, which reduces the distance between the vertical electrode 4 and the regular hexagonal grounding body 1. shielding effect.

With the above structure, the utility model has the advantages of simple structure, convenient construction and excellent performance. By connecting the electrodes on the horizontal ray electrodes, the impact characteristics of the grounding device can be improved, the impact dispersion capacity of the grounding device can be improved, and the spark effect can be enhanced to reduce the centralized grounding of wind turbines. The purpose of the device to impact the grounding impedance is to improve the lightning protection level of the wind turbine.

Claims (5)

1. one kind possesses the earthing device reducing Transient grounding resistance, comprise regular hexagon earth electrode (1), horizontal rays electrode (2), it is characterized in that: six summits of regular hexagon earth electrode (1) are fixedly connected with horizontal rays electrode (2), horizontal rays electrode (2) and regular hexagon earth electrode (1) are in same level.

2. a kind of according to claim 1 possess the earthing device reducing Transient grounding resistance, it is characterized in that: described horizontal rays electrode (2) is provided with two divergent electrode (3).

3. a kind of according to claim 2 possess the earthing device reducing Transient grounding resistance, it is characterized in that: described divergent electrode (3) and regular hexagon earth electrode (1) are in same level, and the angle between divergent electrode (3) and horizontal rays electrode is 60 degree.

4. a kind of according to claim 1 possess the earthing device reducing Transient grounding resistance, it is characterized in that: described horizontal rays electrode (2) is provided with vertical electrode (4).

5. a kind of according to claim 4 possess the earthing device reducing Transient grounding resistance, it is characterized in that: described vertical electrode (4) and regular hexagon earth electrode (1) are in same level, the mid point of vertical electrode (4) is located on horizontal rays electrode (2), and vertical with horizontal rays electrode (2).