Grounding method of reducing local impact grounding resistance of power plant and substation

Abstract

The invention discloses a grounding method of reducing local impact grounding resistance of a power plant and a substation, which comprises an inner-layer annular horizontal grounding body, an outer-layer annular horizontal grounding body, a horizontal connection body and a vertical grounding body. According to the grounding method of reducing local impact grounding resistance of a power plant and a substation, local impact grounding resistance of a power plant and a substation can be reduced, diffusion of local impact grounding current is enhanced, a grounding grid local electric potential can be prevented from rising, and safety of primary and secondary devices such as a transformer can be protected; electric potential and electric field distribution around a grounding electrode can be improved, the step voltage, device contact voltage values and the like can be reduced; and the grounding method of reducing local impact grounding resistance of a power plant and a substation has the advantages of wide application range, convenient construction, corrosion resistance, safety and reliability, and long service life.

Description

technical field [0001] The invention mainly relates to the field of reducing the impact grounding resistance, in particular to a method for reducing the impact grounding resistance of lightning conductors, lightning rods or grounding down conductors of lightning arresters in power plants and substations. Background technique [0002] As the transmission capacity of the power grid continues to increase, the stability requirements of the power system are gradually increased, and the system failures caused by human factors are gradually decreasing, while the proportion of failures caused by lightning strikes is gradually increasing. When lightning strikes power plants and substations The grounding resistance presented by the grounding device is called the impact grounding resistance. When the lightning current enters the ground through the lightning conductor, the lightning rod or the grounding conductor of the lightning arrester, the voltage of the surrounding transformer and o...

AI Technical Summary

Problems solved by technology

[0007] In order to solve the problem of excessively high local impact grounding resistance in power plants and substations, the present invention provides a new grounding method, which lays a grounding line at a depth of about 1 meter from the surface of the ground where the lightning conductor, lightning rod or lightning arrester grounding lead enters the site. Inner and outer double-layer annular grounding bodies (see attached figure 1 ), and then lay a horizontal connector between the inner and outer ring-shaped grounding bodies (5 meters, which can be appropriately reduced if limited by the terrain) to connect the inner and outer rings together, and connect the outer ring-shaped horizontal grounding body to the Embed a 1.2-1.5m vertical ground electrode at each connection point of the original ground grid, effectively weld the horizontal ground body and the vertical ground electrode together, and coat the horizontal ground body with a resistance reducing agent

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