Grading ring used on electric transmission line tower

Abstract

The invention relates to a grading ring used on an electric transmission line tower, and belongs to the technical field of high-voltage electrical equipment. The grading ring is a hollow flat round shape, an installation hole is formed in the center of the grading ring, the height H of the grading ring ranges from 20 cm to 30 cm, the thickness d of a shell of the grading ring ranges form 0.1 cm to 1 cm, the radius R of the grading ring ranges form 15 cm to 25 cm, and the arc radius r of the shell of the grading ring is equal to H / 2. Tests and simulated analysis of the compact electric transmission line tower with the grading ring prove that compared with a common grading ring 37 cm in diameter at present, the grading ring used on an electric transmission line tower has the advantages that 50% of discharged voltage of shielding failure and counter attracts of positive thunders and negative thunders simulated in a thunder impact test can be improved, and the thunder withstand level of the electric transmission line tower on the shielding failure and the counter attracts of the positive thunders and the negative thunders can be further improved. The grading ring is simple in structure and convenient to install and manufacture, and bringing convenience to large-scale production and application.

Description

technical field [0001] The invention relates to a voltage equalizing ring used on a power transmission line tower, and belongs to the technical field of high-voltage electrical equipment. Background technique [0002] On the transmission line tower using composite insulators, when the voltage level is greater than 110kV, it is necessary to install a voltage equalizing ring to make the voltage at the end of the insulator uniform. However, after adding a voltage equalizing ring, although the voltage distribution at both ends of the insulator can be improved, the effective air gap of the insulator will be reduced, thereby reducing the lightning resistance level of the transmission line tower. Experiments have shown that after installing ordinary pressure equalizing rings, the lightning resistance level is reduced by 6-11% compared with that without pressure equalizing rings. [0003] According to the statistics of lightning discharge channels of compact towers over the years, ...

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Problems solved by technology

[0003] According to the statistics of lightning discharge channels of compact towers over the years, most of the discharge channels are discharges from the equalizing ring at the upper phase conductor to the tower, or the discharge from the upper phase conductor to the insulator hanging the lower phase conductor near the equalizing ring on the side of the tower. The reason is that the inhomogeneity of the electric field near the existing voltage equalizing ring is more likely to cause discharge

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