CN204424463U - A kind of branch is the horizontal grounding objects of the three stage structure of 120 ° - Google Patents

Abstract

A three-stage horizontal grounding body with 120° branches, the first electrode 1, the second electrode 2, and the third electrode 3 are fixedly connected to each other on the same horizontal plane at an angle of 120°. The length of the second electrode 2 and the third electrode 3 are equal, and the length of the first electrode 1 is 1-2 times that of the second electrode 2 . The stray current is injected from the beginning of the first electrode, and spreads the current to the surrounding soil through the second electrode 2 and the third electrode 3 . The utility model is a horizontal grounding body with a three-section structure with 120° branches, which has a simple structure, a small footprint, convenient installation, and can effectively reduce the impact grounding resistance.

Description

A horizontal grounding body with a three-stage structure with 120° branches

technical field

The utility model relates to a horizontal grounding body with a three-section structure with 120° branches, which relates to the field of lightning protection for overhead power transmission lines.

Background technique

Tower grounding resistance is an important technical index that affects the lightning protection performance of overhead transmission lines. Reducing the impact grounding resistance of towers can significantly improve the lightning resistance level of overhead transmission lines, thereby reducing the lightning tripping rate of lines. In the research on the electrical performance of tower grounding, the long-standing main problem is that the grounding resistance of towers is too high under the condition of high resistivity soil, and the effect of existing resistance reduction measures is not obvious.

Many scholars at home and abroad have carried out relevant theoretical and experimental research on reducing grounding resistance, and proposed different resistance reduction methods and measures to improve the grounding impact performance of towers. Professor Leonid Grcev from the Faculty of Electrical Engineering and Information Technology, St. Cyril Murdodi University in Skopje, Macedonia, used the frequency-domain electromagnetic field method to estimate the grounding shock characteristics, and fitted the empirical calculation formula of the shock coefficient, but this method only applies to soil The discharge was simulated, and no effective resistance reduction measures were proposed. Chinese patent CN203434295U "A radial ground electrode with multiple diffuser arms" provides a radial ground electrode with two diffuser arms with an angle of 60 degrees at each vertex of the quadrilateral electrode, which has the effect of reducing the impact grounding resistance Significant, but its structure is relatively complex.

Contents of the invention

In view of the existing resistance reduction measures, the resistance reduction effect of the ground electrode with a simple structure is not obvious, and the structure of the ground electrode with a good resistance reduction effect is relatively complicated. The utility model provides a horizontal grounding body with a three-segment structure with branches of 120°. The guiding idea is to reduce the inductance effect and enhance the spark effect, and the simple structure can effectively reduce the grounding resistance.

The technical scheme that the utility model takes is:

A horizontal grounding body with a three-stage structure with branches of 120°, the first electrode, the second electrode, and the third electrode are fixedly connected to each other on the same horizontal plane at an angle of 120°. The length of the second electrode and the third electrode are equal, and the length of the first electrode is 1-2 times that of the second electrode. The horizontal grounding body with a three-stage structure with branches of 120° is a resistance-reducing retrofit scheme for the horizontal rays connected to the frame grounding body. The increase in the length of the first electrode is mainly to reduce the impact of the square frame grounding body on the second electrode and the second electrode. Three-electrode shielding. The stray current is injected from the beginning of the first electrode, and spreads the current to the surrounding soil through the first electrode and the third electrode.

The first electrode, the second electrode, and the third electrode are stainless steel with a circular cross section.

The first electrode, the second electrode, and the third electrode are stainless steel with a rectangular cross section.

The first electrode, the second electrode, and the third electrode are stainless steel with an L-shaped cross section.

The first electrode, the second electrode and the third electrode are connected by welding.

The utility model is a horizontal grounding body with a three-section structure with 120° branches. The utility model has the advantages of simple structure, small occupied area, convenient installation, and can effectively reduce the grounding resistance.

Description of drawings

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

Fig. 2 is the electrode structure schematic diagram of circular section described in the utility model;

Fig. 3 is the electrode structure schematic diagram of rectangular section described in the utility model;

Fig. 4 is a schematic diagram of the electrode structure of the L-shaped section of the utility model.

Detailed ways

Example 1:

The object of the utility model is the horizontal ray conductor of the square ray-type grounding body of the overhead transmission line pole tower. The utility model transforms the original single horizontal ray conductor into a three-section structure with 120° branches, reduces the inductance effect in the transient process of the grounding body by reducing the longitudinal inductance of the grounding body, and increases the grounding body end The stray current in the part increases the spark effect of the grounding body, thereby significantly reducing the impact grounding resistance of the box-ray type grounding body.

Adopt circular cross-section steel as shown in Figure 1 and Figure 2, the length of the first electrode 1 is 50m, the length of the second electrode 2 and the third electrode 3 is 50m, and the three sections of electrodes are connected into one by welding, so that They are on the same plane, and the angle between each two segments is 120 degrees. The grounding body of this structure is horizontally buried 1m underground, and the beginning of the first electrode 1 is connected to the grounding lead wire. When the lightning current invades, the stray current is injected from the first electrode 1, and spreads the current to the surrounding soil through the second electrode 2 and the third electrode 3, so as to reduce the grounding resistance.

Example 2:

Adopt rectangular cross-section steel as shown in Figure 1 and Figure 3, the length of the first electrode 1 is 30m, the length of the second electrode 2 and the third electrode 3 is 25m, and the three sections of electrodes are connected into one by welding, so that In the same plane, and the angle between each two sections is 120 degrees. The grounding body of this structure is horizontally buried 1m underground, and the beginning of the first electrode 1 is connected to the grounding lead wire. When the lightning current invades, the stray current is injected from the first electrode 1, and spreads the current to the surrounding soil through the second electrode 2 and the third electrode 3, so as to reduce the grounding resistance.

Example 3:

The L-shaped cross-section steel material shown in Figure 1 and Figure 4 is adopted, the length of the first electrode 1 is 60m, the length of the second electrode 2 and the third electrode 3 is 30m, and the three sections of electrodes are connected as one by welding, so that They are on the same plane, and the angle between each two segments is 120 degrees. The grounding body of this structure is horizontally buried 1m underground, and the beginning of the first electrode 1 is connected to the grounding lead wire. When the lightning current invades, the stray current is injected from the first electrode 1, and spreads the current to the surrounding soil through the second electrode 2 and the third electrode 3, so as to reduce the grounding resistance.

Circular cross-section, rectangular cross-section, and L-shaped cross-section steel are currently commonly used in the market. They are cheap, easy to purchase, simple in secondary processing, and less difficult to weld, and their corrosion resistance can be significantly improved by galvanizing their surfaces. Therefore, steel materials with three cross-sections have been widely used in the field of grounding materials.

Claims (5)

1. a branch is the horizontal grounding objects of the three stage structure of 120 °, it is characterized in that, the first electrode (1), the second electrode (2), third electrode (3) are each other in same level, be fixedly connected with in 120 ° of angles;

Second electrode (2), third electrode (3) length are equal, and the length of the first electrode (1) is 1 ~ 2 times of the second electrode (2);

Dispersed current of grounding grids is injected, by the second electrode (2) and third electrode (3) soil dissufion current towards periphery by the first electrode (1) top.

2. a kind of branch is the horizontal grounding objects of the three stage structure of 120 ° according to claim 1, it is characterized in that, the stainless steel that described first electrode (1), the second electrode (2), third electrode (3) are circular cross-section.

3. a kind of branch is the horizontal grounding objects of the three stage structure of 120 ° according to claim 1, it is characterized in that, the stainless steel that described first electrode (1), the second electrode (2), third electrode (3) are square-section.

4. a kind of branch is the horizontal grounding objects of the three stage structure of 120 ° according to claim 1, it is characterized in that, the stainless steel that described first electrode (1), the second electrode (2), third electrode (3) are L-type cross section.

5. according to Claims 1 to 4 any one, a kind of branch is the horizontal grounding objects of the three stage structure of 120 °, it is characterized in that, the first electrode (1), the second electrode (2), third electrode are welded to connect between (3).