Device and method for reducing grounding resistance of grounding grid

Abstract

The invention discloses a device for reducing grounding resistance of grounding grid. The device comprises at least one horizontal grounding conductor which is fixed at the bottom of the tower. The horizontal grounding conductor is provided with at least one spark thorn conductor which is fixed between the middle part of the horizontal grounding conductor and the impingement current injection point of the horizontal grounding conductor. By setting the spark thron conductor at the front middle of the impingement current injection point near the horizontal grounding conductor, a large part of the current flow of the injection point will flow to the spark thorn conductor, so that the equivalent radius of the spark effect of the spark conductor is enlarged, the soil is more prone to breakdown, and the spark effect is very significant, which, at the same time, has a great influence on the current distribution of the horizontal grounding conductor, so that the resistance value of the grounding resistance is reduced, and the resistance reduction effect is remarkable.

Description

technical field [0001] The invention belongs to the technical field of lightning protection and grounding of electric power systems, and in particular relates to a device and method for reducing the impact grounding resistance of a ground grid. Background technique [0002] The grounding device of the transmission line is the basic guarantee and important measure to maintain the safe and reliable operation of the power system and to ensure the safety of electrical equipment and operating personnel. A grounding body with good impact characteristics can provide effective protection for transmission lines, thereby avoiding power outages caused by lightning strikes, which is of great significance to the safe operation of the power system and the reliability of power supply. [0003] With the development of my country's power grid and the improvement of power system stability, among all power system faults, the proportion of accidents caused by lightning strikes is on the rise. ...

AI Technical Summary

Problems solved by technology

As far as a single horizontal grounding body is concerned, increasing the number or length of buried grounding conductors can effectively reduce the power frequency grounding resistance, but when the length of the conductor increases to a certain value (this length is the effective length of the grounding body impact), with the length of the grounding body The power frequency grounding resistance continues to decrease, while the impact grounding resistance maintains a constant value and does not continue to decrease. The impact grounding resistance will also decrease with the increase of the length of the additional vertical grounding body, and finally tends to be stable. The additional vertical grounding body increases, and the impact grounding resistance decreases; but too many vertical grounding bodies, the shielding effect between the grounding bodies is obvious, which will hinder the reduction of the impact grounding resistance

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