Environment-friendly anti-corrosion large grounding grid with adjustable grounding impedance and construction method

Abstract

The invention relates to an environment-friendly anti-corrosion large grounding grid with adjustable grounding impedance. A voltage-sharing bus is made of a seamless steel tube of which the inner walland the outer wall are subjected to conductive and antiseptic treatment, and release holes are uniformly distributed in the tube; the grounding grid comprises a circle of outer edge voltage-sharing bus buried at the outermost edge of a whole area and a grounding grid main body buried in an device area, the grounding grid main body comprises a tubular voltage-sharing bus and a grounding wire whichare buried in the device area, and an outer edge voltage-sharing bus and a grounding grid main body voltage-sharing bus are communicated with each other; a steel pipe vertically communicated with thevoltage-sharing buses is mounted above the ground of each device area to serve as an injection hole, the top end of each injection hole is of a sealed structure, and a grounding electrode which is vertically communicated with the tubular voltage-sharing bus and is downwards inserted into the ground is arranged on the tubular voltage-sharing bus of the grounding grid. According to the invention, the problems of oxidation and disconnection of the grounding grid caused by electrochemical erosion of harmful substances in soil can be effectively prevented, and the safe operation period of the large grounding grid can be prolonged exponentially.

Description

technical field [0001] The invention relates to power plants, substations, electrified railways, petroleum, chemical industry, dangerous goods storage, large-scale grounding grid anti-corrosion, resistance reduction, grounding grid design and construction technology, specifically a large-scale grounding grid with environmentally friendly anti-corrosion and adjustable grounding impedance and Construction method. Background technique [0002] Large-scale grounding grids for electric power, railways, petroleum, and chemicals are electrical equipment that integrates several major functions, including system working grounding, protective grounding, lightning protection grounding, anti-static grounding, and anti-interference grounding. [0003] The grounding grid is usually made of galvanized flat steel and copper bars. Electrochemical erosion by harmful substances in the soil, causing severe corrosion and disconnection. After iron oxide and copper oxide are produced, the ground...

AI Technical Summary

Problems solved by technology

Electrochemical erosion by harmful substances in the soil, causing severe corrosion and disconnection

After iron oxide and copper oxide are produced, the grounding resistance increases and cannot be restored to the safe operating value

[0004] It is very difficult to lay measuring wires due to the damage of young crops and urban buildings when measuring large-scale grounding grids according to regulations. The measured grounding resistance and conduction value cannot correctly judge the electrical integrity, safety and reliability of the grounding grid.

[0005] It is very difficult to reduce the grounding impedance for large grounding grids in areas with high soil resistivity

Unable to meet the technical requirements of conducting the grounding short-circuit current of the power system and releasing the lightning current

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