CN101752684A - Corrosion-proof grounding electrode with adjustable grounding resistance - Google Patents

Abstract

The invention relates to a grounding electrode in a lightning protection grounding system of a power plant, a transformer substation grounding grid, a high-voltage transmission line iron tower, an electrified railway grounding system, a wireless communication launching tower, a transformer neutral point and a high-rise building, a large-scale computer and a microelectronic equipment system equipment center. The invention comprises a thick-wall seamless steel tube of a grounding electrode main body, wherein the wall thickness of the steel tube is more than 8-10mm, the inner wall and the outer wall of the steel tube are both provided with an anticorrosive conductive film, the lower end of the steel tube is provided with an end socket, the top end of the steel tube is provided with an openable filling opening, the wall of the steel tube is provided with a release hole, the steel tube is filled with an inner filling material with water absorption and water retention properties, the inner filling material is provided with a plug, the steel tube is externally provided with an outer filling material with good electric conduction, non-corrosion and water permeability, and the lower part. The invention has the advantages of convenient installation and construction, good resistance reduction effect, convenient maintenance and service life not less than that of ground equipment, and not only meets the anticorrosion function of the grounding electrode in the grounding grid, but also achieves the purpose of reducing the grounding resistance performance of the grounding electrode.

Description

Anti-corrosion, ground electrode with adjustable ground resistance

technical field

The invention relates to grounding poles of power plants and substation grounding grids, iron towers of high-voltage transmission lines, grounding systems of electrified railways, wireless communication transmission towers, grounding poles of neutral points of transformers, and equipment centers of high-rise buildings, large computers, and microelectronic equipment systems. The grounding electrode in the lightning protection grounding system, the resistance reduction of the grounding electrode, the anti-corrosion of the grounding electrode, and the technical field of grounding electrode production.

Background technique

The grounding electrode refers to the part of the grounding wire buried in the ground, generally including the grounding electrode of the power plant, the grounding grid of the substation, the iron tower of the high-voltage transmission line, the grounding system of the electrified railway, the wireless communication tower, the grounding electrode of the neutral point of the transformer, and the high-level Ground electrode in the lightning protection grounding system of buildings, large-scale computers, and microelectronic equipment system equipment centers. The grounding electrode installed in the large grounding grid is usually φ60 galvanized steel pipe or 50×5 galvanized angle steel. Due to the leakage of high-voltage equipment and the electrochemical erosion caused by soil acid and alkali, the loss of the cross-sectional area of the grounding electrode is relatively large. Fast, the grounding resistance value of the grounding electrode is increased, the ability of the grounding electrode to release lightning current is reduced, and the potential gradient difference of the grounding grid when releasing lightning current is increased, which poses a threat to the safety of electrical equipment in power plant substations. Especially high-rise buildings, large-scale computer system work centers, high-voltage transmission towers, wireless communication towers, etc., once the grounding electrode is severely corroded or the grounding resistance increases, it is equivalent to losing the lightning protection grounding protection. The hazards to persons and electrical equipment will be catastrophic.

Although the grounding grid and grounding electrodes of electric power and communication systems in some areas use nano-carbon anti-corrosion conductive coatings to increase the service life of the grounding electrodes, it is impossible to reduce the grounding resistance value, enhance the release ability of lightning current, and Lightning disasters cannot be reduced.

The grounding resistance of high-rise buildings and electrical equipment in areas with low rainfall and severe groundwater level drops increases significantly, especially in power plants, substations, high-voltage transmission towers, and wireless communication towers in mountainous, hilly, and desert drought-stricken areas. It is very difficult to make the grounding resistance meet the requirements of the regulations.

At present, methods to reduce grounding resistance are commonly used in the field: such as installing a large number of graphite resistance-reducing modules and grounding electrodes that can release electrolytes. There is a certain amount of pollution, and the grounding resistance cannot be kept running stably for a long time. After many years, the grounding resistance has risen again, and it is difficult to reduce the grounding resistance. It can only be replaced by investing a lot of money again, and a lot of manpower and material resources are required. In general, graphite resistance modules can only be added to reduce grounding resistance, and graphite resistance-reducing powder is used to bury grounding grid wires and grounding electrodes, or copper-clad steel is used to release electrolyte grounding electrodes. All steels are corrosive to a certain extent, especially the galvanized grounding electrode is severely corroded by the use of graphite-based resistance reducing agents, and it will cause irreversible pollution to groundwater and soil environments.

Contents of the invention

The purpose of the present invention is to provide a new anti-corrosion grounding electrode with adjustable grounding resistance. The anti-corrosion function of the grounding electrode can also achieve the grounding electrode that reduces the grounding resistance of the grounding electrode.

The technical solution of the present invention is: the present invention—the grounding electrode with anti-corrosion and adjustable grounding resistance, including a thick-walled seamless steel pipe as the main body of the grounding electrode, the wall thickness of the steel pipe is above 8-10mm, and the inner and outer walls of the steel pipe are equipped with Anti-corrosion conductive film, the lower end of the steel pipe is provided with a head that is easy to insert into the earth, the top of the steel pipe is provided with an openable filling port, and a release hole is opened on the steel pipe wall, and the inner filler with water absorption and water retention properties is filled in the steel pipe. As a water-retaining and drag-reducing agent, there is a dust-proof and sundry-proof plug on the inner filler at the upper end of the steel pipe, which can be opened at any time with a special tool, and the inner filler is added as a water-retaining and drag-reducing agent. The outer filler with good performance is provided with an interface for connecting the grounding grid and the grounding wire of the equipment under the opening of the upper end of the steel pipe.

According to the present invention, the anti-corrosion conductive film arranged on the inner and outer walls of the steel pipe adopts nano-carbon anti-corrosion conductive paint; the inner filler filled in the steel pipe adopts an environmentally friendly and conductive water-retaining agent; the outer filler adopts a good conductive Raw ore granular material: The raw ore granular material with good conductivity can be a single pure conductive metal raw ore powder or a mixed conductive metal raw ore powder. An extension joint capable of connecting an extension pipe is provided at the middle and lower section of the steel pipe of the ground electrode main body.

The working principle of the present invention is: the grounding pole of the present invention is inserted into the ground with an anti-corrosion conductive pipe, and the depth and angle are arbitrarily determined according to geological conditions and grounding resistance requirements. Filled with green and environmentally friendly crystal compounds, the breathing holes absorb the water backfilled during construction, and absorb natural rainwater after being put into operation, so that the green and environmentally friendly chemical crystals become electrolytic solutions, which infiltrate into the soil and become electrolytic ion soils with good conductivity, forming electrolytic The liquid penetrates in the depth direction in the mountains, hills and arid desert areas, making the geological structure with extremely poor conductivity to form a good conductive channel. Minimizes leakage resistance between the ground electrode and the surrounding soil.

The present invention adopts above-mentioned technical scheme and its produced beneficial effect is:

It adopts the grounding electrode with adjustable grounding resistance and conductive anti-corrosion. It integrates professional technology of anti-corrosion and resistance reduction. It not only has the anti-corrosion function, but also has the function of adjusting the grounding resistance, and can automatically reduce the grounding resistance by natural precipitation. Its maintenance cycle can be once in many years, and the filling, inspection and maintenance methods are very convenient. The value required by the regulations can make the corrosion resistance life of the ground electrode longer than the service life of the ground equipment.

After anti-corrosion treatment is carried out on the inner wall and outer wall of the grounding electrode steel pipe, the grounding electrode steel pipe has strong acid and alkali corrosion resistance, and the construction does not need to dig a large amount of earthwork. It is drilled with a micro-hydraulic drilling machine or a small drilling machine, and then inserted into the adjustable grounding resistance and conductive anti-corrosion. Grounding electrode, add conductive ore metal powder particles to the outer gap of the grounding electrode, install dust-proof and soil-proof plugs after adding water-retaining agent inside the grounding electrode tube, the dust-proof plug must be opened with a special tool, connect the grounding wire, and install it on the outside of the grounding electrode Water tamping. It is very convenient for post-corrosion inspection and measurement of grounding resistance. The grounding electrode pipe is equipped with an environmentally friendly water-retaining drag-reducing agent. For the first time, artificial water is added to reach the design value, and then it is supplemented by natural rainwater accumulation to maintain the conditions for the decomposition of the environmentally friendly water-retaining agent in the grounding electrode and to add corrosion-resistant raw ore conductive granular materials to the ground electrode. The deep penetration of the earth achieves the natural combination of rainwater and environmental protection water-retaining agent by the sky, without the need for manpower to carry out routine and frequent inspections and measurements. Can save a lot of time, manpower and material resources. Significantly improve safety and reliability.

After a few years, the grounding resistance will rise, and the resistance-reducing and water-retaining agent will be consumed. You can open the dust-proof plug at any time and add an environmentally friendly water-retaining and reducing agent to keep the grounding resistance value permanently stable.

The conductive anti-corrosion material added to the external coating of the ground electrode adopts raw ore particle materials with good conductivity, such as various iron ore and other good conductive raw ore powders. Effective surface area reduces ground resistance. (According to the experimental results, the raw ore powder particles have been buried in various environments for ten years without signs of corrosion).

The environmental protection anti-corrosion ground electrode of the present invention is developed according to the special environment and the complexity of the changeable operation mode of the electric power system and the electrified railway ground system. The invention makes the grounding resistance of power plants, substations, traction substations of electrified railways and towers of high-voltage transmission lines in special environments reach the value required by regulations for a long time. The scope of application of the present invention is:

1. It is suitable for grounding grid projects of power plants, substations and wind farms;

2. It is suitable for lightning protection grounding, mobile communication base stations, and microwave communication stations of ultra-high voltage transmission line towers passing through mountainous areas, hills, and desert arid areas;

3. It is suitable for ground network engineering in areas with severe corrosion and areas with high soil grounding resistivity;

4. It is suitable for grounding grids in computer rooms whose design value is less than 1Ω, grounding grids in automation control rooms, and precision equipment grounding grids;

5. Electrified railway track voltage balance coil, ground electrode of return line

6. It is suitable for the grounding resistance of the equipment installed in a special environment to drop to the value required by the regulations. Grounding

Description of drawings

Fig. 1 is a structural representation of the present invention

Fig. 2 is the structural schematic diagram of the anti-corrosion conductive film coated on the inner and outer walls of the main steel pipe in the present invention

Detailed ways

As shown in the accompanying drawings, the anti-corrosion, grounding electrode with adjustable grounding resistance of the present invention includes a thick-walled seamless steel pipe 3 as the main body of the grounding electrode. Conductive film 9, the lower end of the steel pipe 3 is provided with a head for easy insertion into the earth, the top of the steel pipe is provided with an openable filling port 1, the wall of the steel pipe 3 is provided with an electrolyte release hole 11, and the steel pipe is filled with water absorption and water retention. The inner filler 5 can also be called a water-retaining and drag-reducing agent. The upper end of the inner filler 5 is equipped with a dust-proof and sundry-proof plug 2, which can be opened at any time by using a special tool, so as to add the inner filler, that is, the water-retaining and drag-reducing agent. 3. Outer filler 6 with good conduction, non-corrosion and water permeability is provided on the outside. Below the opening at the upper end of the steel pipe, there is an interface 4 for connecting the grounding grid 7 and the equipment grounding lead 8. An extension joint 10 capable of connecting an extension pipe is provided at the middle and lower section of the ground electrode main body steel pipe 3 .

According to the present invention, the anti-corrosion conductive film 9 arranged on the inner and outer walls of the steel pipe 3 adopts nano-carbon anti-corrosion conductive paint; the inner filler 5 packed in the steel pipe adopts environmental protection and conductive water retention agent; Raw ore granular material with good conductivity; the raw ore granular material with good conductivity here can be a single pure conductive metal raw ore powder, or a mixed conductive metal raw ore powder.

Claims (3)

1. anticorrosion, the adjustable ground resistance earth utmost point, it is characterized in that: this earth electrode comprises the thick-walled seamless steel pipes as the earth electrode main body, thickness of steel pipe is located at more than the 8-10mm, in the steel pipe, outer wall all is provided with anticorrosion conducting film, the steel pipe lower end is provided with the end socket of being convenient to insert the earth, the steel pipe top is provided with can open feeding port, on steel pipe walls, offer release aperture, in steel pipe, fill out to be provided with and have suction, the interior filler of water retention property, in the steel pipe upper end, be provided with dustproof anti-foreign material on the filler and enter plug, outside steel pipe, be provided with conduction, do not corrode, the outer filler that water permeability is good below steel pipe upper end open place, is provided with the interface that connects ground network and equipment ground lead-in wire.

2. anticorrosion, the adjustable ground resistance earth utmost point according to claim 1 is characterized in that: the described anticorrosion conducting film that is located on the steel pipe inner and outer walls adopts nano-carbon anticorrosion conductive coating; The described interior filler that is filled in the steel pipe adopts environmental protection, the water-loss reducer of conduction; The good raw ore granular materials of described outer filler conduction.

3. anticorrosion, the adjustable ground resistance earth utmost point according to claim 1 is characterized in that: the middle hypomere at above-mentioned earth electrode main body steel pipe is provided with the lengthening joint that can connect extension pipe.

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