Multi-current scattering arm star-shaped grounding electrode topological structure

A technology of topology structure and grounding electrode, applied in the field of lightning protection and grounding of power system, can solve the problems of inability to truly reflect the lightning protection effect of grounding devices, insufficient impact characteristics, etc., and achieve the effect of avoiding construction difficulties, improving impact characteristics, and being easy to install.

Active Publication Date: 2013-12-18
EXAMING & EXPERIMENTAL CENT OF ULTRAHIGH VOLTAGE POWER TRANSMISSION COMPANY CHINA SOUTHEN POWER GRID +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The acceptance of the grounding device is still based on whether the power frequency grounding resistance is qualified or not. The characteristics cannot truly reflect the lightning protection effect of the grounding device, and the impact characteristics of the grounding electrode need to be considered
The above commonly used grounding electrodes meet the standards in terms of power frequency characteristics, but often have insufficient impact characteristics.

Method used

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  • Multi-current scattering arm star-shaped grounding electrode topological structure
  • Multi-current scattering arm star-shaped grounding electrode topological structure
  • Multi-current scattering arm star-shaped grounding electrode topological structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0018] The following introduces the specific content of the new ground electrode:

[0019] The arrangement of the double diffuser arm star ground electrode is as follows: figure 2 . The specific method is: add three forked diffuser arms to each radiation branch of the star-shaped ground electrode, one end of the forked diffuser arm is connected to the end of the radiation branch, and the other end extends radially.

[0020] In order to reduce the impact grounding resistance of the grounding body, the method of increasing the size or equivalent radius of the grounding body is usually relied on. The present invention achieves the goal by increasing the diffusion channel of the grounding body and increasing the effective length of the grounding body.

[0021] The impact characteristics of the improved star-shaped grounding electrode: such as figure 1 As shown, the common star-shaped grounding electrode has two radial branches, and the multi-scattered arm star-shaped grounding ...

Embodiment approach

[0025] in such as figure 2 , using as figure 1 The electrodes are made of the same material, and the star-shaped grounding electrode R-R1-R2 is welded so that the angle between R and R1 is 135°, and the angle between R1 and R2 is 90°, and the lengths of R, R1, and R2 are a, b, and b respectively . Weld the star electrodes R11-R12-R13 and R21-R22-R23 at the two ends of A and B respectively according to the above standard, and their lengths are c, c, c, c, c, c respectively. The electrode length satisfies the proportional relationship a:b:c=5:2:1.

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Abstract

The invention belongs to the field of electric system grounding for lightening protection, and relates to a multi-current scattering arm star-shaped grounding electrode topological structure. The multi-current scattering arm star-shaped grounding electrode topological structure is specifically suitable for a grounding electrode in a pole tower earth screen. A novel grounding electrode arrangement form is designed so that an impact grounding resistance value under a high earth resistivity can be reduced. According to the arrangement form, current scattering channels, in the grounding electrode, of a lightning current are increased, namely, each radiation branch of the star-shaped grounding electrode is additionally provided with at least one bifurcate current scattering arm, one end of each bifurcate current scattering arm is connected with the tail end of the corresponding radiation branch, the other end of each bifurcate current scattering arm extends in the radial direction, therefore, the better current scattering effect can be achieved, the impact performance of a grounding body is effectively improved, and the impact grounding resistance value of the grounding electrode is reduced. The structure is easy to manufacture and install, construction difficulty caused by the fact that the grounding electrode is lengthened blindly is avoided, a very good resistance reducing effect can be achieved, the performance is superior, and the structure is economical and reasonable.

Description

[0001] technical field [0002] The invention belongs to the field of lightning protection and grounding of electric power systems, and relates to a star-shaped grounding pole topology structure with multiple scattered flow arms, which is particularly suitable for grounding poles in pole tower grounding grids. By designing a new grounding pole layout form, high soil resistance can be effectively reduced The impact grounding resistance value under the rate. Background technique [0003] The design criteria for the commonly used tower grounding electrode form mainly include: [0004] 1. Grounding body structure - due to the four-legged structure of the tower in practical applications, and considering the shielding effect as small as possible, and considering the construction engineering volume, the radial grounding body is widely used because of its symmetrical structure and few welding points. [0005] 2. Effective length - due to the high equivalent frequency of lightning c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01R4/66H01R4/58
Inventor 周文俊张建刚陈欢王昕常安杨跃光苏国磊张福张厚荣李文荣罗望春夏长征魏绍东
Owner EXAMING & EXPERIMENTAL CENT OF ULTRAHIGH VOLTAGE POWER TRANSMISSION COMPANY CHINA SOUTHEN POWER GRID
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