Liquid resistance reduction material and application thereof in auxiliary grounding resistance reduction

Abstract

The invention provides a liquid resistance reduction material and application thereof in auxiliary grounding resistance reduction, and belongs to the technical field of grounding resistance reduction. The liquid resistance-reducing material provided by the invention contains the conductive fibers, the graphene and the gelatin, so that the contact resistance of a grounding body can be effectively reduced, and the grounding lightning protection effect is improved. As the grounding grid is in a liquid state, the permeability is good, the grounding grid can be better combined with complex terrains, and the grounding grid is suitable for grounding grid use scenes in more geographical environments. After the liquid resistance reducing material is solidified, the effective area of the earth screen is enlarged, charges carried by thunder and lightning are neutralized with charges of different polarities in the ground in a short time, and thunder and lightning discharge is completed. In addition, the liquid resistance-reducing material provided by the invention can also wrap a grounding system, has excellent wear resistance, effectively avoids grounding faults caused by the property defects of the grounding system, and improves the safety of a grounding grid application scheme.

Description

Technical Field

[0001] The present invention relates to the technical field of grounding resistance reduction, and in particular to a liquid resistance reduction material and application thereof in auxiliary grounding resistance reduction. Background Art

[0002] The grounding grid is a lightning discharge network composed of a main grounding wire and several grounding bodies, where the grounding body is a conductor buried underground, one end of each grounding body is connected to the main grounding wire, and the other end is buried underground. Take the iron tower that connects the transmission line as an example. The building material of the iron tower is generally metal. When the iron tower is struck by lightning, the lightning is discharged into the grounding grid through the iron tower, and flows to each grounding body through the main grounding wire. Then, each grounding body discharges the lightning into the earth, so that the large amount of electric charge carried by the lightning is neutralized with the opposite charge carried by the earth, and then the lightning is discharged to achieve the lightning protection effect.

[0003] In the prior art, the grounding body used in the grounding grid generally includes a metal rod and a non-metallic block of a fixed shape (such as a graphite block). One end of the metal rod is inserted into the graphite block, and the other end is connected to the main grounding wire in the grounding grid. However, the geographical environment where the grounding grid needs to be laid is often more complex: for example, in rocky areas, due to the high resistivity of the rock, the conductivity is poor, and thus the conductive performance of the grounding grid is required to be high. If the non-metallic blocks in the prior art are used, they are fragile during long-distance transportation, and the contact area with the rock is small after being buried in the rock, so that lightning cannot quickly enter the rock and the soil gap. Therefore, in a short period of time, the charge carried by the lightning cannot contact with more opposite charges, and cannot quickly neutralize with the opposite charges in the earth, resulting in poor lightning discharge effect.

[0004] In addition, the current grounding system uses grounding electrodes made of galvanized steel, graphite flake premixed composite materials, copper-clad steel, etc. Although such core rods can improve their electrical conductivity, mechanical strength, and corrosion resistance, due to the large differences in the metallographic structures of different raw materials and the weak adhesion between the materials, the grounding electrodes are prone to partial detachment or peeling due to friction with soil, sand, etc. in actual applications, thus affecting the service life of the grounding system. In addition to poor wear resistance, the grounding system also has the disadvantages of being bulky, easy to crack, and easy to fall off the metal core, which can easily cause grounding faults. Summary of the invention

[0005] The purpose of the present invention is to provide a liquid resistance reduction material and its application in auxiliary grounding resistance reduction, which can improve the lightning protection effect of the grounding grid and at the same time improve the mechanical properties and service life of the grounding system.

[0006] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0007] The present invention provides a liquid drag-reducing material, comprising the following components:

[0008] Conductive fibers, graphene, gelatin and base solvent.

[0009] Preferably, the weight ratio of the conductive fiber, graphene and gelatin in the liquid resistance reducing material is 15-25:0.5-2:20-40.

[0010] Preferably, the base solvent is water.

[0011] Preferably, the liquid drag-reducing material comprises the following components in parts by weight:

[0012] 15-25 parts of conductive fibers, 0.5-2 parts of graphene, 20-40 parts of gelatin, and 40-60 parts of base solvent.

[0013] Preferably, the liquid drag-reducing material comprises the following components in parts by weight:

[0014] 19 parts of conductive fiber, 1 part of graphene, 30 parts of gelatin, and 50 parts of base solvent.

[0015] The present invention also provides application of the above-mentioned liquid resistance reduction material in auxiliary grounding resistance reduction.

[0016] The present invention also provides an auxiliary grounding resistance reduction method, comprising the following steps:

[0017] S1, digging trench;

[0018] S2. Lay horizontal and vertical grounding electrodes of the grounding grid in the trench;

[0019] S3, pouring the above-mentioned liquid resistance reduction material to wrap the horizontal grounding body and the vertical grounding body of the grounding grid;

[0020] S4. After the liquid resistance reduction material solidifies, auxiliary grounding resistance reduction is completed.

[0021] In the present invention, the horizontal grounding and vertical grounding bodies can be made of materials such as flexible graphite fiber grounding wires, round steel, flat steel, copper wires, copper bars, and metal alloy rods.

[0022] Technical effects and advantages of the present invention:

[0023] The liquid resistance reduction material provided by the present invention contains conductive fibers, graphene and gelatin, which can effectively reduce the contact resistance of the grounding body and improve the grounding lightning protection effect. Because it is in a liquid state, it can be better combined with complex terrain and is suitable for grounding grid usage scenarios in more geographical environments. When the liquid resistance reduction material solidifies, it expands the effective area of ​​the grounding grid, neutralizes the charge carried by lightning with the opposite charge in the earth in a short time, and completes the lightning discharge.

[0024] The liquid resistance-reducing material provided by the present invention can also wrap the grounding system and has excellent wear resistance, effectively avoiding grounding faults caused by defects in the nature of the grounding system itself, and improving the safety of the grounding grid application solution. DETAILED DESCRIPTION

[0025] The technical solutions provided by the present invention are described in detail below in conjunction with the embodiments, but they should not be construed as limiting the protection scope of the present invention.

[0026] Example 1

[0027] Preparation of liquid drag reduction material:

[0028] Conductive fiber 19%, graphene solution 1%, gelatin 30%, water 50%.

[0029] Weigh the materials in the above weight ratio and mix well.

[0030] Example 2

[0031] Digging a trench, laying horizontal grounding electrodes and vertical grounding electrodes, and pouring the liquid resistance-reducing material obtained in Example 1;

[0032] In this embodiment, flexible graphite fiber grounding wires are selected for horizontal grounding and vertical grounding.

[0033] After pouring the liquid resistance reduction material, the liquid resistance reduction material diffuses around the trench and wraps the horizontal joint and the vertical grounding body, and forms an integral joint with the soil around the trench after solidification.

[0034] Comparative Example 1

[0035] In a conventional manner, horizontal and vertical grounding electrodes are laid on the ground, one end of a metal rod is inserted into the graphite block, and the other end is connected to the main grounding wire in the grounding grid.

[0036] Prepare 4 round steel bars with a diameter of 16 mm and a length of 1200 mm (weld an L-shaped terminal at the end of the round steel bar for easy testing).

[0037] In uniform soil with a soil resistivity of 65Ω.m:

[0038] Drive a galvanized round steel bar with a diameter of 16 mm and a length of 1200 mm into the trench.

[0039] Place a galvanized round steel with a diameter of Φ16mm and a length of 1200mm in the flat horizontal trench, backfill with soil in layers, and compact it completely.

[0040] Make a groove in the trench and drive in a Φ16mm, 1200mm long round galvanized steel bar, then slowly pour the prepared liquid resistance reduction material on it.

[0041] Place a Φ16mm, 1200mm long galvanized round steel in the flat horizontal trench, pour the prepared liquid resistance reduction material on it, and after the liquid resistance reduction material solidifies, backfill the trench with plain soil.

[0042] An electrode is buried in the trench, which is a Φ16mm galvanized round steel, a cylindrical graphite block with an outer diameter of 100mm and a length of 1200mm.

[0043] Experimental example

[0044] Drag reduction effect test:

[0045] A comparative experiment was conducted in a uniform soil with a soil resistivity of 65Ω·m:

[0046] Comparison of drag reduction effect before and after adding liquid drag reduction material:

[0047] Experimental methods and procedures

[0048] A1.1 Experimental Preparation

[0049] Experimental tools and equipment: AR4105+ ground resistance tester, electric pick, shovel, hammer, ruler.

[0050] Experimental materials: round steel electrodes with a diameter of 16 mm and a length of 1200 mm, and liquid resistance reduction materials (containing 19% conductive fiber, 1% graphene solution, 30% gelatin, and 50% water).

[0051] A1.2 Experimental procedures

[0052] Step 1: Drive the round steel vertically In a trench with a depth of 800mm and a width of 300mm, drive a round steel electrode with a diameter of 16mm and a length of 1200mm vertically into the soil until it is completely buried. Use a ground resistance tester to measure the ground resistance value at this time and get 35.2Ω.

[0053] Step 2: Horizontally install round steel. Place round steel electrodes with a diameter of 16 mm and a length of 1200 mm horizontally in a pre-dug trench with a depth of 800 mm and a width of 300 mm and backfill with soil. Then backfill the soil in layers and ensure that each layer of soil is fully compacted. After backfilling, use a ground resistance tester to measure and obtain a ground resistance value of 37.6Ω.

[0054] Step 3: Vertical pouring of liquid resistance reduction material. Dig a groove of appropriate size in the pre-dug trench with a depth of 800mm and a width of 300mm. Vertically drive a round steel electrode with a diameter of 16mm and a length of 1200mm into the groove, and then slowly pour the pre-configured liquid resistance reduction material. The liquid resistance reduction material diffuses around the round steel electrode and wraps the round steel electrode until it is completely covered. After the liquid resistance reduction material solidifies, use a ground resistance tester to measure the ground resistance, and the measured resistance value is 14.1Ω.

[0055] Step 4: Place round steel horizontally and pour liquid resistance reduction material. After placing a round steel electrode with a diameter of 16mm and a length of 1200mm in a trench with a depth of 800mm and a width of 300mm, pour the liquid resistance reduction material. The liquid resistance reduction material will spread around the round steel electrode and wrap the round steel electrode until it is completely covered. After the liquid resistance reduction material solidifies, fill the trench with soil and further compact it. The ground resistance tester was used to measure, and the result showed that the ground resistance value was 15.3Ω.

[0056] Step 5: Vertical installation of built-in electrode graphite block. Dig a hole of suitable size at the bottom of the pre-dug trench with a depth of 800mm and a width of 300mm. Put the cylindrical graphite block with built-in Φ16mm and 1200mm long galvanized round steel electrode into the hole, backfill with soil, and tamp it completely. Use a ground resistance tester to measure the ground resistance, and the measured resistance value is 28.4Ω.

[0057] Step 6: Horizontally install the built-in electrode graphite block. Place a cylindrical graphite block with a built-in Φ16mm and 1200mm long galvanized round steel electrode in a pre-dug trench with a depth of 800mm and a width of 300mm. The outer diameter of the graphite is 100mm. Backfill with plain soil and tamp it. Use a ground resistance tester to measure the ground resistance, and the measured resistance value is 28.5Ω.

[0058] A1.3. Experimental results

[0059] The resistance value of a Φ16mm, 1200mm long round steel electrode driven vertically is 35.2Ω.

[0060] The resistance value of a Φ16mm, 1200mm long round steel electrode placed horizontally and backfilled with soil is 37.6Ω. The resistance value of a Φ16mm, 1200mm long round steel electrode placed vertically in a groove and then poured with liquid resistance-reducing material is 14.1Ω.

[0061] The resistance value after horizontally placing a Φ16mm, 1200mm long round steel electrode and pouring liquid resistance reduction material and backfilling with plain soil is: 15.3Ω.

[0062] The resistance value of a cylindrical graphite block with a built-in Φ16mm and 1200mm long round steel electrode installed vertically and backfilled with soil is 28.4Ω.

[0063] The resistance value of a cylindrical graphite block with a built-in Φ16mm and 1200mm long round steel electrode placed horizontally and backfilled with soil is: 28.5Ω.

[0064] The test results are shown in Table 1 below:

[0065] Table 1 Drag reduction effect test results

[0066]

[0067] The test results of the control group are shown in Table 2 below:

[0068] Table 2 Resistance reduction effect test results

[0069]

[0070]

[0071] Anti-corrosion performance test before adding liquid resistance reduction material:

[0072] Alkali resistance

[0073] The round steel with a diameter of 16 mm and a length of 50 mm was washed, dried, and weighed to 79.01 g. It was then immersed in a 5% NaOH solution and kept at room temperature for 480 h. After immersion, yellow rust products appeared on the surface. After washing and drying, it weighed to 78.895 g, with a weight loss rate of 0.146%.

[0074] Acid resistance

[0075] The round steel with a diameter of 16 mm and a length of 50 mm was washed, dried, and weighed, and then immersed in a 5% HCI solution and kept at room temperature for 480 hours. After the immersion, yellow rust products appeared on the surface. After cleaning and drying, the weight was 78.882, and the weight loss rate was 0.162%.

[0076] Salt tolerance

[0077] The round steel sample with a diameter of 16mm and a length of 50mm was washed, dried, and weighed to 79.01g, and immersed in 5% NaCl solution and kept at room temperature for 480h. After the immersion, yellow rust products appeared on the surface. After washing and drying, the weight was 78.845, and the weight loss rate was 0.209%.

[0078] Anti-corrosion performance test after adding pouring liquid resistance reduction material:

[0079] Alkali resistance

[0080] The round steel with a diameter of 16mm and a length of 50mm was washed, dried, and weighed to 79.01g, and then placed in the prepared liquid resistance reduction material solution. After the resistance reduction solution wrapped the round steel and the resistance reduction solution was completely solidified, the wrapped block was immersed in a 5% NaOH solution and kept at room temperature for 480h. After the immersion was completed, the wrapped block was fished out and the round steel was taken out. There was no obvious change in appearance. It was cleaned and dried and weighed to 79.01g, and the weight loss rate was 0

[0081] Acid resistance

[0082] The round steel with a diameter of 16mm and a length of 50mm was washed, dried, and weighed to 79.01g, and then placed in the prepared liquid resistance reduction material solution. After the resistance reduction solution wrapped the round steel and the resistance reduction solution was completely solidified, the wrapped block was immersed in 5% HCI solution and kept at room temperature for 480h. After the immersion was completed, the wrapped block was fished out and the round steel was taken out. There was no obvious change in appearance. It was cleaned and dried and weighed to 78.009g, with a weight loss rate of 0.00127%

[0083] Salt tolerance

[0084] The round steel with a diameter of 16mm and a length of 50mm was washed, dried, and weighed to 79.01g, and then placed in the prepared liquid resistance reduction material solution. After the resistance reduction solution wrapped the round steel and the resistance reduction solution was completely solidified, the wrapped block was immersed in a 5% NaCl solution and kept at room temperature for 480h. After the immersion was completed, the wrapped block was fished out and the round steel was taken out. There was no obvious change in appearance. It was cleaned and dried and weighed to 79.008g, with a weight loss rate of 0.00253%.

[0085] The comparison results of the weight loss rate of anti-corrosion performance before and after pouring the liquid resistance reduction material are shown in Table 3 below:

[0086] Table 3 Comparison of weight loss rate of anti-corrosion performance before and after pouring liquid resistance reduction material

[0087]

[0088] It can be seen from the above experimental examples that the liquid resistance reduction material of the present invention can not only significantly reduce the contact resistance of the grounding body in practical applications, but also performs well in terms of corrosion resistance. Through comparative experiments, we can see that the round steel electrodes without liquid resistance reduction materials all showed obvious rust after being immersed in alkaline, acidic and saline solutions, and the weight loss rate was all above 0.1%. However, the round steel electrodes using liquid resistance reduction materials showed almost no change in appearance after being immersed under the same conditions, and the weight loss rate was close to zero, which shows that the liquid resistance reduction material has a good anti-corrosion effect, can effectively protect the grounding body from corrosion, and extend the service life of the grounding body.

[0089] In addition, the liquid resistance reduction material also shows great convenience during the construction process. Due to its liquid characteristics, it can be easily poured around the grounding body and can fully fill the tiny gaps in the soil to ensure good contact between the grounding body and the soil. The fluidity of this material makes it particularly suitable for irregular or difficult-to-construct terrain, such as rocky soil, stony soil, etc., and can significantly improve the overall performance of the grounding system.

[0090] In practical applications, the use of liquid resistance reduction materials can also reduce the maintenance cost of the grounding system. Due to its excellent anti-corrosion performance, the maintenance cycle of the grounding body can be extended, reducing grounding faults caused by corrosion, thereby reducing maintenance frequency and related costs. At the same time, the use of liquid resistance reduction materials also improves the reliability of the grounding system, ensures the stable operation of the power system, and is of great significance to the safety of power facilities.

[0091] In summary, the liquid resistance reduction material and its application method provided by the present invention are not only innovative in technology, but also have significant economic and social benefits in practical applications. It provides a new solution for grounding resistance reduction in power systems and has broad market application prospects.

[0092] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A liquid drag-reducing material, characterized in that: Includes the following components: Conductive fibers, graphene, gelatin and base solvent.

2. The liquid drag-reducing material according to claim 1, characterized in that: The weight ratio of the conductive fiber, graphene and gelatin in the liquid resistance-reducing material is 15-25:0.5-2:20-40.

3. The liquid drag-reducing material according to claim 1 or 2, characterized in that: The base solvent is water.

4. The liquid drag-reducing material according to claim 1, characterized in that: The liquid drag-reducing material comprises the following components in parts by weight: 15-25 parts of conductive fibers, 0.5-2 parts of graphene, 20-40 parts of gelatin, and 40-60 parts of base solvent.

5. The liquid drag-reducing material according to claim 4, characterized in that: The liquid drag-reducing material comprises the following components in parts by weight: 19 parts of conductive fiber, 1 part of graphene, 30 parts of gelatin, and 50 parts of base solvent.

6. Use of the liquid resistance-reducing material according to any one of claims 1 to 5 in auxiliary grounding resistance reduction.

7. An auxiliary grounding resistance reduction method, characterized in that: The following steps are involved: S1, digging trench; S2. Lay horizontal and vertical grounding electrodes of the grounding grid in the trench; S3. pouring the liquid resistance reduction material according to any one of claims 1 to 5 to wrap the horizontal grounding body and the vertical grounding body of the grounding grid; S4. After the liquid resistance reduction material solidifies, auxiliary grounding resistance reduction is completed.

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