Grounding resistance reducing method for expanding current diffusing channel in ground

Abstract

The invention provides a grounding resistance reducing method for expanding a current diffusing channel in a ground, and belongs to the technical field of high voltage. The method comprises the following steps: vertically drilling a hole in the ground at any position within the coverage range of a grounding grid; the hole is filled with water, explosives are placed at set intervals from the bottom of the hole to the position away from the ground by a set distance, and the explosives are used for blasting; a steel pipe is placed in the hole to serve as a vertical grounding electrode; pressing the resistance reducing agent which is prepared into slurry into the hole and a crack generated by blasting; and connecting the steel pipe with the horizontal grounding body to finish construction. According to the resistance reduction method for safely expanding the current diffusion channel in the ground, the grounding resistance of a grounding system can be effectively reduced through a small amount of multiple times of underwater blasting, and reliable operation of an electric power system is maintained while the equipment and personal safety is guaranteed.

Description

technical field [0001] The invention relates to the technical field of high voltage, in particular to a method for reducing grounding resistance by expanding the current dispersal channel in the ground, which can be used to reduce the grounding resistance of a grounding system and enhance the ability of lightning and fault current to disperse in the ground. Background technique [0002] For the sake of work and safety in the power system, it is often necessary to connect some parts of the power system and its electrical equipment to the ground, which is grounding. The grounding system is an important measure to ensure equipment and personal safety and maintain the reliable operation of the power system. The lower the grounding resistance, the better. In areas with high soil resistivity such as mountainous areas, it is difficult for the grounding resistance of the grounding system to meet the standard requirements. [0003] In order to reduce the grounding resistance of the ...

AI Technical Summary

Problems solved by technology

Therefore, the drag reduction effect corresponding to blindly increasing the amount of explosives does not increase proportionally, and there is a saturation trend

Secondly, the increase in the amount of explosives means that the safety becomes worse. This is not only because the blasting itself is more destructive, but because the geology near the explosives layout becomes more fragmented, the bearing capacity of the foundation deteriorates, and the long-term stability of its surface power equipment become worse

Finally, in order to make the blasting shock wave propagate as far as possible, the existing method needs to use a large number of sandbags to seal the orifice on the surface tightly, which not only increases the workload, but once the sandbag is washed away, it will be more destructive

It can be seen that although blasting grounding technology has an outstanding resistance reduction effect, the current technology is poor in safety, the concentration of cracks is trivial, and its expansion range is limited. Better technology needs to be developed

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