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

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...

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.

Images