CN112447310A - Resistance reducing agent and preparation method and application thereof - Google Patents
Resistance reducing agent and preparation method and application thereof Download PDFInfo
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- CN112447310A CN112447310A CN202011268247.3A CN202011268247A CN112447310A CN 112447310 A CN112447310 A CN 112447310A CN 202011268247 A CN202011268247 A CN 202011268247A CN 112447310 A CN112447310 A CN 112447310A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/14—Conductive material dispersed in non-conductive inorganic material
- H01B1/18—Conductive material dispersed in non-conductive inorganic material the conductive material comprising carbon-silicon compounds, carbon or silicon
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/14—Conductive material dispersed in non-conductive inorganic material
- H01B1/16—Conductive material dispersed in non-conductive inorganic material the conductive material comprising metals or alloys
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
- H01R4/58—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation characterised by the form or material of the contacting members
- H01R4/66—Connections with the terrestrial mass, e.g. earth plate, earth pin
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R43/00—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors
Abstract
The invention provides a resistance reducing agent and a preparation method and application thereof, wherein the resistance reducing agent comprises a combination of carbon, a sodium chloride source and iron powder, and the combination of the carbon, the sodium chloride source and the iron powder ensures that the resistance reducing agent has excellent resistance reducing effect, excellent corrosion resistance, long-acting property and stability; when the resistance reducing agent is used for reducing the resistivity of the soil around the grounding body, the construction amount is small, the transportation cost is low, the economic benefit is obvious, the resistance reducing agent has no influence on the environment such as the surrounding soil, the ecological environment cannot be damaged, and the application value is high.
Description
Technical Field
The invention belongs to the technical field of electric power engineering materials, and particularly relates to a resistance reducing agent, and a preparation method and application thereof.
Background
As an indispensable part of a power system, the voltage of a transformer is controlled within a safe range, and the voltage must be effectively regulated and controlled by a transformer resistance grounding technology. The main evaluation index of the grounding device is the grounding resistance of the grounding device, and according to the requirement of the national standard on the grounding resistance of electrical equipment, when the capacity of a transformer does not exceed 100 kilovolts, the grounding resistance is not more than 10 ohms, and when the capacity of the transformer exceeds kilovolts, the grounding resistance is not more than 4 ohms; the ground resistance of the ground is proportional to the resistivity of the soil in the area and inversely proportional to the square root of the total area of the ground grid. In high-resistivity areas with neutral pH value of soil, such as mountainous areas and sandy soils, the grounding resistance of a grounding grid is difficult to be effectively reduced, and the effect of enabling the grounding resistance to reach the standard without increasing the area of the grounding grid is generally realized by methods of enlarging the contact area of a grounding body, improving the resistivity of surrounding soil, increasing the current dispersion area and the like.
At present, the addition of a resistance reducing agent is a common technology for effectively reducing the resistivity of soil around a grounding body, and the resistance reducing agent is composed of various components, such as fine graphite, bentonite, a curing agent, a lubricant, conductive cement and the like, so that the resistance reducing agent becomes a good conductor. CN106941028A discloses a preparation method of an environment-friendly grounding resistance-reducing agent for high-resistivity soil. Firstly, lanthanum oxide, nitric acid solution and the like are reacted to prepare mixed solution, then graphene is crushed and heated to expand and is subjected to alkaline corrosion to enable the graphene to generate a porous structure, then a resin group is introduced onto the graphene, the graphene is embedded in a bacterial cellulose network structure generated by microorganisms, the bacterial cellulose has strong water retention capacity, the equivalent cross section area of a grounding body and the contact area with soil can be increased, then organic rare earth and the graphene surface resin group are loaded in pores of the graphene, and finally the graphene is mixed with an auxiliary agent and the like to obtain the grounding resistance reducing agent. CN104218334A discloses a method for reducing corrosion of a grounding resistance reducer to a grounding body and the grounding resistance reducer, which comprises the preparation of a long-acting anticorrosive agent, the preparation of the grounding resistance reducer and the mixing of the long-acting anticorrosive agent in the grounding resistance reducer; the preparation of the long-acting anticorrosive agent comprises the following steps: feeding ammonium carbonate, powdered activated carbon and bentonite into a mixer, stirring and mixing, wherein the ammonium carbonate is adsorbed by the powdered activated carbon and is coated by the bentonite, so as to prepare the long-acting anticorrosive agent; the long-acting anticorrosive agent has the characteristics of alkalescence and slow release, can keep the long-acting property of the anticorrosive effect, and has the advantages of obvious resistance reducing effect of the grounding resistance reducing agent, environmental protection, convenient use and low cost. CN105957577A discloses a calcium bentonite resistance-reducing agent for grounding, which comprises the following components: calcium bentonite, carbon fiber, ammonium chloride, calcium oxide, zinc powder, nickel powder, ammonium persulfate, sodium molybdate, conductive cement, graphene, aluminum powder, aniline and sodium tripolyphosphate. The resistance reducing agent solves the defects of common resistance reducing agents such as high packaging and construction difficulty and the like, and solves the problem that the grounding body cannot be normally used for a long time. However, research shows that the resistance reducing agent provided in the prior art mostly uses graphene and other components, which results in higher cost of the resistance reducing agent; on the other hand, in the process of practical use, the resistance reducing agent provided by the prior art has poor resistance reducing continuity, can only maintain the resistance reducing effect for 3-4 months generally, and needs to be replaced at irregular time, otherwise, the safe and stable operation of the transformer and the line equipment thereof can be damaged.
Therefore, it is necessary to develop a sustainable resistance-reducing agent which has low cost, convenient transportation, good resistance-reducing effect, no influence from seasons and no damage to the environment.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a resistance reducing agent, a preparation method and application thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the present invention provides a friction reducer comprising a combination of carbon, a sodium chloride source, and iron powder.
The resistance reducing agent provided by the invention comprises the combination of carbon, a sodium chloride source and iron powder; wherein, the carbon has excellent conductivity, corrosion resistance, stability and water absorption, can reduce the resistivity of the soil near the grounding body and can exist stably for a long time; the sodium chloride source also has good hydrophilicity and can absorb moisture in soil near the grounding body, so that the resistance reducing agent has higher water content when in use, can reduce barriers for particle migration and reduce migration resistance of charged particles, the sodium chloride source generates free sodium ions when meeting water, and the pore structure of the carbon can well absorb the free sodium ions and fix the free sodium ions in the pore structure, thereby avoiding loss of the sodium ions; the main effect of the iron powder is to fill gaps existing between the carbon and the sodium chloride source to improve the stability of the resistance reducing agent, and in addition, the interfaces of various materials are connected, so that the interface resistance of the materials can be effectively reduced, and the resistivity of the soil near the grounding body is further reduced. Therefore, the resistance reducing agent with good resistance reducing effect, stability and excellent corrosion resistance is finally obtained through the combination of the carbon, the sodium chloride source and the iron powder.
Preferably, the resistance reducing agent comprises the following components in percentage by mass:
carbon 10-24%, such as 11%, 11.5%, 12%, 12.5%, 13%, 13.5%, 14%, 14.5%, 15%, 15.5%, 16%, 16.5%, 17%, 17.5%, 18%, 18.5%, 19%, 19.5%, 20%, 20.5%, 21%, 21.5%, 22%, 22.5%, 23%, or 23.5%, and specific points between the above points, are not intended to be limiting to the space and for brevity and the present disclosure is not intended to be exhaustive of the specific points included in the scope.
Sodium chloride source 40-60%, such as 41%, 42%, 43%, 44%, 45%, 46%, 47%, 48%, 49%, 50%, 51%, 52%, 53%, 54%, 55%, 56%, 57%, 58%, or 59%, and specific points therebetween, limited to space and for brevity, the invention is not exhaustive of the specific points included in the ranges.
Iron powder 20-46%, such as 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34%, 35%, 36%, 37%, 38%, 39%, 40%, 41%, 42%, 43%, 44%, or 45%, and specific points therebetween, not to be limited by the space and for brevity, the invention is not exhaustive of the specific points encompassed by the scope.
As a preferred technical scheme, the resistance reducing agent with excellent resistance reducing effect can be obtained only when the mass percentage of the carbon is 10-24%, the mass percentage of the sodium chloride source is 40-60%, and the mass percentage of the iron powder is 20-46%; if the carbon content is too much, the mass percentage content of the iron powder is not changed, and the content of the sodium chloride source is too low, the water absorption of the resistance reducing agent is poor, and the migration resistance of the charged particles is increased; if the carbon content is too much and the sodium chloride source is not changed, the content of the iron powder is too low, so that the interfaces of the substances cannot be well connected together, and the interface resistance is increased; if the carbon content is too low and the iron powder content is not changed, the sodium chloride source is too much, the generated free sodium ions cannot be completely absorbed by the carbon, and finally the loss of the sodium ions is caused, and in addition, the resistance reducing agent is also unstable; if the carbon content is too low and the sodium chloride source content is not changed, the iron powder content is too high, and the cost is increased. Therefore, the mass percentages of the carbon, the sodium chloride source and the iron powder are related to each other, each component cannot be too much or too little, and only within the range limited by the preferred technical scheme of the invention, the obtained resistance reducing agent has excellent resistance reducing effect, stability and low cost.
Preferably, the char comprises charcoal and/or coke.
Preferably, the coke comprises any one of coal coke, petroleum coke, or pitch coke, or a combination of at least two of the foregoing.
Preferably, the sodium chloride source comprises any one of common salt, sea salt or sodium chloride purities or a combination of at least two of the foregoing.
Preferably, the iron powder comprises raw iron powder and/or atomized iron powder.
In a second aspect, the present invention provides a method for preparing the resistance reducing agent according to the first aspect, the method comprising: and mixing carbon, a sodium chloride source and iron powder to obtain the resistance reducing agent.
In a third aspect, the present invention provides the use of a friction reducer according to the first aspect for reducing the resistivity of soil.
In a fourth aspect, the present invention provides a method of reducing the resistivity of soil in the vicinity of a ground engaging body, the method comprising: arranging a foundation pit in the soil near the grounding body, wherein the foundation pit comprises a resistance reducing agent area and a backfill area from bottom to top; placing the drag reducer of the first aspect in the drag reducer area and filling the backfill area with backfill.
The invention provides a method for reducing the resistivity of soil near a grounding body, which comprises the following steps of firstly, arranging a foundation pit comprising a resistance reducing agent area and a backfill area near the grounding body, wherein the schematic cross-sectional structure of the foundation pit is shown in figure 1, wherein 1 represents the ground, 2 represents the backfill area, 3 represents the resistance reducing agent area, 4 represents the position for arranging the grounding body, and 5 represents an upper lead; and (3) connecting a grounding body, placing the resistance reducing agent in the resistance reducing agent area 3, and finally filling and leveling the backfill area 2 by using backfill. The whole process has the advantages of small construction amount, convenient operation and suitability for large-scale use.
The method for reducing the resistivity of the soil near the grounding body by adopting the resistance reducing agent comprises the following two principles: on one hand, the resistance reducing agent is tightly wrapped around the grounding body and tightly connected with the adjacent soil layer to form a conductor with a larger diameter, and the conductor can form a dendritic extension body in the ground to generate the dendritic benefit, so that the resistance reducing agent becomes a best medium, the inner layer of the resistance reducing agent is tightly connected with the grounding body, and the outer layer of the resistance reducing agent is tightly connected with the surrounding soil, thereby greatly reducing the contact resistance of the grounding body and the soil; on the other hand, the size of the grounding body is increased by the resistance reducing agent wrapped on the grounding body, so that the resistance of the grounding body is reduced, because the resistivity of the resistance reducing agent is very small, the resistance reducing agent is wrapped around the grounding body, and compared with the resistivity of soil, the resistivity of the resistance reducing agent is generally two orders of magnitude smaller, so that the resistance of the resistance reducing agent can be ignored, and the resistance reducing agent is regarded as metal, which is equivalent to the size increase of the grounding body, so that the purpose of reducing the grounding resistance is achieved, and the effect of connecting a plurality of foundation pits in parallel is better.
Preferably, the depth of the foundation pit is 1-1.5 m, such as 1.1m, 1.15m, 1.2m, 1.25m, 1.3m, 1.35m, 1.4m or 1.45m, and the specific values therebetween are limited by the space and for the sake of brevity, and the invention is not exhaustive.
Preferably, the shape of the top view of the foundation pit is an isosceles triangle.
Preferably, the depth ratio of the resistance reducing agent area to the backfill soil area is 1 (1-1.2), such as 1:1.02, 1:1.04, 1:1.06, 1:1.08, 1:1.1, 1:1.12, 1:1.14, 1:1.16 or 1: 1.18.
Preferably, the method comprises: arranging a foundation pit with the depth of 1-1.5 m in the soil near the grounding body, wherein the foundation pit comprises a resistance reducing agent area and a backfill area with the depth ratio of 1 (1-1.2) from bottom to top, pouring the resistance reducing agent in the first aspect into the resistance reducing agent area, and filling the backfill area with backfill soil; the top view shape of the foundation pit is an isosceles triangle.
Compared with the prior art, the invention has the following beneficial effects:
the resistance reducing agent provided by the invention comprises a combination of carbon, a sodium chloride source and iron powder, and has excellent resistance reducing effect, excellent corrosion resistance, long-acting property and stability through the cooperation of the carbon, the sodium chloride source and the iron powder; the resistance reducing agent provided by the invention is applied to a method for reducing the resistivity of soil near a grounding body, and the resistance obtained by testing is 3-18 omega, and the resistance reducing agent has excellent stability and long-acting property; and when the resistance reducing agent is used for reducing the resistivity of the soil around the grounding body, the construction amount is small, the transportation cost is low, the economic benefit is obvious, the resistance reducing agent does not damage the surrounding soil and other environments, the application value is high, and the market application prospect is wide.
Drawings
Fig. 1 is a schematic cross-sectional structure diagram of a foundation pit, wherein 1-ground, 2-backfill region, 3-resistance reducing agent region, 4-position of grounding body, and 5-lead-up line.
Detailed Description
The technical solution of the present invention is further explained by the following embodiments. It should be understood by those skilled in the art that the examples are only for the understanding of the present invention and should not be construed as the specific limitations of the present invention.
Examples 1 to 8
The specific components of the resistance reducing agent are shown in Table 1, and the unit of the usage of each component is weight portion; wherein the sea salt is from salt monopoly market in Chaozhou city, the coal tar is from maple spring market in Chaozhou city, and the reduced iron powder is from hematite ore in Chaozhou city.
TABLE 1
The preparation method comprises the following steps:
and mixing the coal coke, the sea salt and the reduced iron powder to obtain the resistance reducing agent.
Example 9
A resistance reducing agent which is different from example 1 only in that common salt is used instead of sea salt, and other components, amounts and preparation methods are the same as example 1, and the resistance reducing agent is obtained.
Example 10
A resistance reducing agent, which is different from example 1 only in that charcoal (maple spring market, tidal city) is used instead of coal tar, and other components, amounts and preparation methods are the same as those of example 1, to obtain the resistance reducing agent.
Comparative example 1
The resistance reducing agent comprises 17 parts by weight of coal coke and 33 parts by weight of reduced iron powder; the preparation method is the same as that of example 1, and the resistance reducing agent is obtained.
Comparative example 2
A resistance-reducing agent comprises 50 parts by weight of sea salt and 33 parts by weight of reduced iron powder; the preparation method is the same as that of example 1, and the resistance reducing agent is obtained.
Comparative example 3
The resistance reducing agent comprises 17 parts by weight of coal coke and 50 parts by weight of sea salt; the preparation method is the same as that of example 1, and the resistance reducing agent is obtained.
Application examples 1 to 10
A method of reducing the resistivity of soil in the vicinity of a grounded body, the method comprising: digging a foundation pit with the depth of 1.5m and an isosceles triangle top view in the soil near the grounding body, wherein the foundation pit comprises a resistance reducing agent area and a backfill area with the depths of 750m from bottom to top, pouring the resistance reducing agent obtained in the embodiments 1-10 into the resistance reducing agent area, and filling the backfill area with backfill soil.
Comparative application examples 1 to 3
A method of reducing the resistivity of soil in the vicinity of a grounded body, the method comprising: digging a foundation pit with the depth of 1.5m and an isosceles triangle in plan view in soil near a grounding body, wherein the foundation pit comprises a resistance reducing agent area and a backfill area with the depths of 750m from bottom to top, pouring the resistance reducing agent obtained in the comparative examples 1-3 into the resistance reducing agent area, and filling the backfill area with backfill soil.
And (3) performance testing:
(1) resistance: using a ground resistance meter model WK-ZC29B (mechanical) or VICTOR4106 (electronic), 3 measurements were averaged per position;
(2) stability: after testing the resistivity for one week, the resistance value is in accordance with the national standard, namely the stability is good. (national standard: ground resistance less than 100kvA (dry tile) is not more than 10 ohm, and ground resistance more than 100kvA is not more than 4 ohm) (3) long-term effect: after testing the resistivity for one year, the resistance value is in accordance with the national standard, namely the long-term effect is good. (national standard: ground resistance less than 100kvA (dry tile) should not be greater than 10 ohm, ground resistance greater than 100kvA should not be greater than 4 ohm)
The resistance reduction effect generated by the method in the application examples 1-10 and the comparative application examples 1-3 is tested by using the test method, and the test results are shown in table 2:
TABLE 2
| Resistance (omega) | Stability of | Long effect | |
| Application example 1 | 3.9 | Good effect | Good effect |
| Application example 2 | 3 | Good effect | Good effect |
| Application example 3 | 3.5 | Good effect | Good effect |
| Application example 4 | 3.9 | Good effect | Good effect |
| Application example 5 | 18 | Good effect | Good effect |
| Application example 6 | 3.9 | In general | In general |
| Application example 7 | 3 | In general | Is poor |
| Application example 8 | 10 | Good effect | Good effect |
| Application example 9 | 3.9 | Good effect | Good effect |
| Application example 10 | 3.1 | Good effect | Good effect |
| Comparative application example 1 | 50 | Is poor | Is poor |
| Comparative application example 2 | 9.7 | Is poor | Is poor |
| Comparative application example 3 | 4 | In general | Is poor |
As can be seen from the data in table 2:
the resistance reducing agent provided by the invention has excellent conductivity, stability and long-acting property;
specifically, the resistance obtained by testing the soil near the grounding body in the method for reducing the resistivity of the soil near the grounding body provided in application examples 1 to 10 is 3 to 18 Ω, and compared with comparative application example 1, the resistance is reduced by 177 to 1566%, because sodium ions can be provided in sea salt, the resistance is effectively reduced; compared with the comparative application example 2, the comparative application example 2 has poor stability and long-term effect because the coal coke or the charcoal is a material with good adsorbability and is fused with the contacted soil after adsorbing saturated sodium ions, so that the resistivity of the soil is reduced, and if no coal coke or charcoal is used for protecting free sodium ions, the sodium ions are lost quickly, so that the resistance is increased quickly, and the stability and the long-term effect are poor; compared with comparative application example 3, the stability is general, and the long-term effect is poor, because the sodium ion preservation protection of the pores of the coal coke or the charcoal is poor, and the iron powder bonding effect is needed to ensure the resistivity stability and the long-term effect.
The resistances obtained by tests in the method for reducing the resistivity of the soil near the grounding body provided in application example 5 and application example 8 are 18 Ω and 10 Ω respectively, and the stability and the long-term durability are also poor, because the addition amount of the sea salt is too small to provide enough sodium ions, thereby resulting in higher resistance.
The reason why the stability and the long-term effect of application example 6 are poor is that the addition amount of the coal coke is too low to provide effective protection for sodium ions, so that the loss of the sodium ions is rapid, and the stability and the long-term effect are poor.
The reason why the stability of application example 7 is good but the long-term effect is poor is that the iron powder is added in too small amount, and although the coke protects sodium ions, the protection strength is not enough, and the sodium ions are still easy to lose in severe weather, and the iron powder is required to be added to play a role in binding, so that the long-term effect of the resistivity is ensured.
The applicant states that the present invention is illustrated by the above examples to provide a resistance reducing agent, a preparation method thereof and a process method applied thereto, but the present invention is not limited to the above process steps, i.e. it is not meant that the present invention must rely on the above process steps to be implemented. It will be apparent to those skilled in the art that any modification of the present invention, equivalent substitutions of selected materials and additions of auxiliary components, selection of specific modes and the like, which are within the scope and disclosure of the present invention, are contemplated by the present invention.
Claims (10)
1. A drag reducing agent, characterized in that the drag reducing agent comprises a combination of carbon, a sodium chloride source, and iron powder.
2. The resistance reducing agent according to claim 1, characterized in that the resistance reducing agent comprises the following components in percentage by mass:
10-24% of carbon;
40-60% of a sodium chloride source;
20-46% of iron powder.
3. The friction reducer of claim 1 or 2, wherein the char comprises coke and/or charcoal;
preferably, the coke comprises any one of coal coke, petroleum coke, or pitch coke, or a combination of at least two of the foregoing.
4. The resistance reducing agent according to any one of claims 1 to 3, wherein the sodium chloride source comprises any one of salt, sea salt, or a pure sodium chloride, or a combination of at least two of the above.
5. The resistance reducing agent according to any one of claims 1 to 4, wherein the iron powder comprises reduced iron powder and/or atomized iron powder.
6. The method for preparing the resistance reducing agent according to any one of claims 1 to 5, wherein the method comprises: and mixing carbon, a sodium chloride source and iron powder to obtain the resistance reducing agent.
7. Use of the drag reducer of any one of claims 1-5 for reducing the resistivity of soil.
8. A method of reducing the resistivity of soil adjacent a grounded body, the method comprising: arranging a foundation pit in the soil near the grounding body, wherein the foundation pit comprises a resistance reducing agent area and a backfill area from bottom to top; placing the drag reducer according to any one of claims 1 to 5 in the drag reducer area, and filling the backfill area with backfill.
9. The method according to claim 8, wherein the depth of the foundation pit is 1-1.5 m;
preferably, the shape of the top view of the foundation pit is an isosceles triangle;
preferably, the depth ratio of the resistance reducing agent area to the backfill soil area is 1 (1-1.2).
10. The method according to claim 8 or 9, characterized in that the method comprises: a foundation pit with the depth of 1-1.5 m is arranged in soil near a grounding body, the foundation pit comprises a resistance reducing agent area and a backfill area with the depth ratio of 1 (1-1.2) from bottom to top, the resistance reducing agent according to any one of claims 1-5 is poured into the resistance reducing agent area, and the backfill area is filled with backfill soil.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113035404A (en) * | 2021-03-12 | 2021-06-25 | 广东电网有限责任公司 | Resistance reducing agent, foundation pit, preparation method and application thereof |
| CN113285250A (en) * | 2021-05-17 | 2021-08-20 | 东莞市长益光电有限公司 | Conductive grounding device and using method |
| CN117410007A (en) * | 2023-10-18 | 2024-01-16 | 湖北兆丰矿业有限公司 | Bentonite powder for grounding resistance reduction |
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| CN106683745A (en) * | 2016-12-16 | 2017-05-17 | 北京先研科技有限责任公司 | Resistance changing agent for changing soil resistance |
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| CN113035404A (en) * | 2021-03-12 | 2021-06-25 | 广东电网有限责任公司 | Resistance reducing agent, foundation pit, preparation method and application thereof |
| CN113285250A (en) * | 2021-05-17 | 2021-08-20 | 东莞市长益光电有限公司 | Conductive grounding device and using method |
| CN117410007A (en) * | 2023-10-18 | 2024-01-16 | 湖北兆丰矿业有限公司 | Bentonite powder for grounding resistance reduction |
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