Protective method for grounding grid

A technology for grounding grids and steel wires, applied in coatings, conductive coatings, epoxy resin coatings, etc., can solve problems such as corrosion cracks, reduced leakage capacity of grounding grids, and power failure accidents, and achieve excellent corrosion resistance and extended service life age, the effect of good grounding conductivity

Inactive Publication Date: 2016-10-05
STATE GRID CORP OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to historical and economic reasons, galvanized steel is mainly used as the grounding grid material in my country, but galvanized steel has been in a complex soil environment for a long time, and corrosion is inevitable
The corrosion of power grounding grids in my country is relatively serious. Almost every province has different degrees of corrosion in power grounding grids, especially in humid and rainy South China, Central China and coastal areas. Serious corrosion will occur on galvanized steel that has been in operation for several years. Even corrosion and fracture will reduce the discharge capacity of the entire grounding grid, thereby endangering the operation of the equipment on the bottom surface and easily causing power outages

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] In this embodiment, the grounding grid is a grounding grid connected by cast copper steel wires; the steel wires are drawn from low-carbon steel with a carbon content of 0.10 wt % through a wire drawing machine. Wherein, the diameter of the steel wire is selected to be 2-12 mm according to the design requirements for the conduction of the main line and the branch line, and the thickness of the cast copper layer outside the steel wire is 0.1-0.2 mm. The cast copper steel wire is dip-plated with a tin coating through a hot-dip tinning process, and an epoxy conductive sealing layer is coated on the tin coating. When hot-dip tinning, the surface of the cast copper wire is first cleaned, and the surface is activated with chloride salt or fluoride salt of alkali metal or alkaline earth metal, and then hot-dip tinning is performed in molten tin liquid. The thickness of the tin plating layer was 20 μm. The thickness of the epoxy conductive sealing layer is 100 μm. The epoxy c...

Embodiment 2

[0019] In this embodiment, the grounding grid is a grounding grid connected by cast copper steel wires; the steel wires are drawn from low-carbon steel with a carbon content of 0.10 wt % through a wire drawing machine. Wherein, the diameter of the steel wire is selected to be 2-12 mm according to the design requirements for the conduction of the main line and the branch line, and the thickness of the cast copper layer outside the steel wire is 0.1-0.2 mm. The cast copper steel wire is dip-plated with a tin coating through a hot-dip tinning process, and an epoxy conductive sealing layer is coated on the tin coating. When hot-dip tinning, the surface of the cast copper wire is first cleaned, and the surface is activated with chloride salt or fluoride salt of alkali metal or alkaline earth metal, and then hot-dip tinning is performed in molten tin liquid. The thickness of the tin coating can be controlled at 20 μm. The thickness of the epoxy conductive sealing layer is 100 μm. ...

Embodiment 3

[0021] In this embodiment, the grounding grid is a grounding grid connected by cast copper steel wires; the steel wires are drawn from low-carbon steel with a carbon content of 0.10 wt % through a wire drawing machine. Wherein, the diameter of the steel wire is selected to be 2-12 mm according to the design requirements for the conduction of the main line and the branch line, and the thickness of the cast copper layer outside the steel wire is 0.1-0.2 mm. The cast copper steel wire is dip-plated with a tin coating through a hot-dip tinning process, and an epoxy conductive sealing layer is coated on the tin coating. When hot-dip tinning, the surface of the cast copper wire is first cleaned, and the surface is activated with chloride salt or fluoride salt of alkali metal or alkaline earth metal, and then hot-dip tinning is performed in molten tin liquid. The thickness of the tin coating can be controlled at 20 μm. The thickness of the epoxy conductive sealing layer is 100 μm. ...

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Abstract

The invention relates to a protective method for a grounding grid which is an earthing system formed by connecting copper casting steel wires. Tin-plated layers are arranged on the copper casting steel wires through the hot-dip tinplating process in a dip plating mode and coated with epoxy conductive closed layers. The steel wires are formed by drawing low-carbon steel with the carbon content, by weight, at 0.05%-0.20% through a drawbench. The diameter of the steel wires is 2-12 mm; the thickness of copper layers is 0.05-0.5 mm; the thickness of the tin-plated layers is 5-50 micrometers; and the thickness of the epoxy conductive closed layers is 10-100 micrometers. The grounding grid not only has excellent grounding conductivity, but also has excellent corrosion resistance even on the humid or acidic geological condition by adoption of the tin-plated layers and the epoxy conductive closed layers, and the service life of the copper casting steel wires can be substantially prolonged.

Description

technical field [0001] The present invention relates to the technical field of grounding wire protection, and more specifically, the present invention relates to a protection method for grounding grids. Background technique [0002] The grounding body, also known as the grounding electrode, is a metal conductor that is in direct contact with the earth. The grounding network is a network that connects multiple grounding bodies with grounding trunk lines. It has the characteristics of reliable grounding and small grounding resistance, and is suitable for the grounding of a large number of electrical equipment. The grounding grid is a necessary facility to ensure the safe operation of power generation, transformation and transmission system equipment and personal safety. Due to historical and economic reasons, galvanized steel is mainly used as the grounding grid material in my country, but galvanized steel has been in a complex soil environment for a long time, and corrosion ...

Claims

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Application Information

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IPC IPC(8): C23C2/08C09D5/24C09D163/00
Inventor 陈瑞刘兖松赵帅余田清周金双王凯王泽晓夏永平杨志李明
Owner STATE GRID CORP OF CHINA
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