CN113270738B - Improved structure of grounding down lead of transmission line tower - Google Patents
Improved structure of grounding down lead of transmission line tower Download PDFInfo
- Publication number
- CN113270738B CN113270738B CN202110594879.7A CN202110594879A CN113270738B CN 113270738 B CN113270738 B CN 113270738B CN 202110594879 A CN202110594879 A CN 202110594879A CN 113270738 B CN113270738 B CN 113270738B
- Authority
- CN
- China
- Prior art keywords
- parts
- galvanized steel
- steel pipe
- grounding
- transmission line
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
- H01R13/46—Bases; Cases
- H01R13/533—Bases, cases made for use in extreme conditions, e.g. high temperature, radiation, vibration, corrosive environment, pressure
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/14—Extreme weather resilient electric power supply systems, e.g. strengthening power lines or underground power cables
Landscapes
- Paints Or Removers (AREA)
Abstract
The invention relates to an improved structure of a grounding down lead of a power transmission line tower, and belongs to the technical field of grounding devices. The utility model provides a transmission line shaft tower ground connection downlead improves structure, includes the steel strand wires, first galvanized steel pipe and second galvanized steel pipe are connected at the both ends of steel strand wires, the ground connection nose is all connected to the other end of first galvanized steel pipe and second galvanized steel pipe, in first galvanized steel pipe and the second galvanized steel pipe with the one end surface that the steel strand wires are connected all sets up the waterproof sealing layer, the steel strand wires and the partial surface of waterproof sealing layer sets up the protective material layer, the surface cladding graphite cloth on protective material layer. According to the technical scheme, the galvanized steel down conductor anti-corrosion performance is improved.
Description
Technical Field
The invention belongs to the technical field of grounding devices, and particularly relates to an improved structure of a grounding down lead of a power transmission line tower.
Background
Reliable grounding of a power transmission line tower of a power system is an important measure for maintaining the practical effectiveness of power equipment to be fully exerted and ensuring the stability and safety of the surrounding environment. In the existing grounding process of the power transmission line tower, a series of problems such as design problems of a grounding grid, corrosion of a grounding down lead and a grounding body, construction problems of the grounding body and the like exist, so that the problems of overhigh resistance, short operation time, high maintenance cost and the like of the grounding body of the power transmission line tower are caused, and the operation benefit of the power transmission line tower is seriously influenced.
Because the operation environment of the grounding device of the power transmission line tower is severe, the danger of electrochemical corrosion is easy to occur in the long-time operation process. In addition, the quality of the selected materials of part of the grounding body is lower than the qualified standard, or some metal chemical elements exist in the grounding body, a corrosive micro-battery can be formed, and the conductivity of the whole grounding device is threatened. At present, a grounding down lead mainly adopts galvanized steel, 304 stainless steel, copper metal, graphite cloth and the like, wherein the galvanized steel is earlier in application, more common, not corrosion-resistant and short in service life; copper metal is expensive and not suitable for large-scale application.
Traditionally for preventing ground connection downlead emergence ground and the 30cm internal part below the ground from taking place the corrosion, can embolia a PVC pipe (like plastic cold water pipe) on ground connection downlead, again with the cement shutoff of cold water pipe both ends, to prevent that the intraductal water logging corrodes the steel strand wires, can make steel strand wires and soil isolation like this to prevented that the steel strand wires from being corroded by soil and rusted, simultaneously not influenced the discharge of lightning current again (the discharge of lightning current mainly depends on steel strand wires self and iron tower and grounding body between be connected).
Patent document CN201413872Y discloses an anticorrosive grounding down conductor, which comprises a conductor, an anticorrosive conductive coating layer and an anticorrosive plastic-plated layer; the outer part of the conductor is coated with an anti-corrosion conductive coating layer, and the anti-corrosion plastic coating layer is wrapped outside the anti-corrosion conductive coating layer. The utility model discloses a compare its greatly increased anticorrosive electrically conductive effect through anticorrosive conductor of plating the plastics processing with traditional conductor, effectually isolated harmful substance such as acid, alkali, salt, microorganism in the soil to the erosion of ground net, isolated the contact of oxygen in ground net and the moist soil, greatly reduced the oxygen uptake of ground net and corrode. On the basis of coating the surface of the conductor with paint, a layer of anti-corrosion plastic-plated material is added to play a role in double protection of a steel structure, so that the service life of the grounding device is greatly prolonged compared with the traditional grounding belt coated with anti-corrosion paint only.
For another example, patent document CN206003981U discloses a galvanized copper-clad steel grounding down-lead device, which includes a galvanized connecting plate, and a galvanized layer is coated on the exterior of the galvanized connecting plate; the galvanized connecting plate is provided with a bolt hole, the lower part of the galvanized connecting plate is connected with a connecting plate and a copper-clad steel connecting piece, and a galvanized copper-clad steel piece is connected below the connecting plate and the copper-clad steel connecting piece; the longitudinal section of the galvanized connecting plate is rectangular, and at least one surface of the galvanized connecting plate is a plane; the number of the bolt holes is at least two, and the bolt holes are uniformly and symmetrically arranged in a line from top to bottom on the galvanized connecting plate; the connecting plate and the copper-clad steel connecting piece are cylindrical; the galvanized copper steel-coated piece is cylindrical, and the down lead device is good in corrosion resistance and good in conductivity.
As can be seen from the above technical documents, the corrosion resistance of the down conductor can be improved or optimized by improving the structure of the grounding down conductor, but the above technique has a small improvement degree on the corrosion resistance of the down conductor, and is generally applied as a completely new grounding down conductor, so that it is not easy to maintain or improve the existing down conductor structure.
Disclosure of Invention
In view of this, the technical problem to be solved by the present invention is to provide an improved structure of a grounding down conductor of a power transmission line tower, so as to improve the corrosion resistance of a galvanized steel down conductor.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
the utility model provides a transmission line shaft tower ground connection downlead improves structure, includes the steel strand wires, first galvanized steel pipe and second galvanized steel pipe are connected at the both ends of steel strand wires, the ground connection nose is all connected to the other end of first galvanized steel pipe and second galvanized steel pipe, in first galvanized steel pipe and the second galvanized steel pipe with the one end surface that the steel strand wires are connected all sets up waterproof sealing layer, the steel strand wires and waterproof sealing layer's partial surface sets up protective material layer, protective material layer's surface cladding graphite cloth.
Preferably, the thickness of the waterproof sealing layer is 4-5 mm, and the coating width of the waterproof sealing layer is 1-2 cm.
Preferably, the waterproof sealing layer is made of polyurethane waterproof sealing glue or silicone waterproof sealing glue.
Preferably, the protective material layer is prepared from novolac epoxy resin, eigen-state polyaniline, nano boron nitride, zinc phosphate, an auxiliary agent, a modified curing agent and acetone.
Preferably, the weight parts of the novolac epoxy resin are 50-70 parts, the weight parts of the eigen-state polyaniline are 3-10 parts, the total weight parts of the nano boron nitride and the zinc phosphate are 8-20 parts, the weight parts of the auxiliary agent are 1-5 parts, the weight parts of the modified curing agent are 3-15 parts, and the weight parts of the acetone are 10-20 parts.
Preferably, the weight ratio of the nano boron nitride to the zinc phosphate is (1-2): (1.5-3).
Preferably, the epoxy value of the novolac epoxy resin is 0.51-0.54mol/100g, and the softening point is 20-30 ℃.
Preferably, the modified curing agent is obtained by the following preparation method: the compound is prepared by taking isophorone diamine and polyether amine as raw materials, and performing Mannich reaction on the isophorone diamine, formaldehyde and phenol.
Preferably, the molar ratio of the isophorone diamine to the polyether amine is (1-2): 1.
preferably, the protective material layer is obtained by mixing, stirring and coating novolac epoxy resin, eigenstate polyaniline, nano boron nitride, zinc phosphate, an auxiliary agent, a modified curing agent and acetone.
Preferably, the first galvanized steel pipe is connected with an above-ground grounding nose, and the second galvanized steel pipe is connected with an underground grounding nose.
Because copper metal reserves are insufficient in China, galvanized steel and flat steel are generally used as grounding materials in a grounding system. The galvanized steel lightning protection downlead that often uses utilizes the oxide film that forms under atmospheric corrosion at the galvanizing coat on steel surface to protect inside steel not to corrode, but in case take place the damage, because the electrode potential difference of zinc and steel, will accelerate the corruption of zinc, very big reduction galvanized steel's life. Therefore, the galvanized steel grounding material needs to be frequently replaced and maintained, and the safe operation of the power line is seriously influenced. The non-metal graphite material has the advantages of corrosion resistance, high temperature resistance, soft ground and the like. Therefore, grounding products made of graphite have been gradually applied to grounding systems in place of metal materials such as galvanized steel, carbon steel, and copper-plated steel in power construction. However, graphite products are generally used for the ground radiating mesh portion, and a metal material is currently used for the ground down conductor portion. Therefore, the down lead is completely buried in the soil, the chemical reaction mechanism of the soil is complex and changeable, a plurality of parameters influencing the soil corrosion are not completely understood, the corrosion process of the buried material is difficult to master, and the difficulty in preventing and controlling the material corrosion in the soil is increased. Based on the research and the current situation actual investigation on the corrosion principle of galvanized steel, the invention provides an improved structure of a galvanized steel down lead to optimize the current galvanized steel down lead and improve the corrosion resistance.
Compared with the prior art, the invention has the following beneficial effects:
the invention is an improvement on the basis of the existing galvanized steel down lead structure, in the traditional galvanized steel down lead, the corrosion of galvanized steel is mainly pitting corrosion and less flaking corrosion, aiming at the current situation, the invention adds the protective material layer and reasonably arranges graphite cloth outside the protective material layer, thereby solving the corrosion problem of the galvanized steel down lead. The existing research shows that the galvanized steel and the graphite belt are coupled and then placed in the soil solution together for catalytic corrosion, and after a period of time, the galvanized steel at the coupling part of the galvanized steel and the graphite belt is relatively seriously corroded, but the galvanized steel on the non-contact surface is not particularly obviously corroded. Based on the structure, the galvanized steel is not contacted with the graphite cloth through reasonable arrangement of the waterproof sealing layer and the protective material layer, the graphite cloth has good corrosion resistance, is arranged at the most prominent part of the galvanized steel down lead corrosion and is directly contacted with soil to serve as a first barrier to prevent the galvanized steel down lead from being corroded by the soil; the protective material layer is used as a second barrier, has good corrosion resistance in the soil environment through reasonable matching of raw materials, and can not react with galvanized steel and graphite cloth, thereby ensuring the barrier function of the protective material layer to be exerted. Meanwhile, the waterproof sealing layer is adopted at the contact position of the protective material layer and the galvanized steel for connection, so that the contact position of the protective material layer and the galvanized steel is kept in a good waterproof state, the water in the soil is prevented from permeating from the contact position, and the corrosion of the galvanized steel is improved.
The protective material layer takes the novolac epoxy resin as a matrix, the novolac epoxy resin has excellent dielectric property and chemical stability, and the novolac epoxy resin is combined with a proper amount of eigen-state polyaniline, so that the comprehensive properties, particularly the corrosion resistance, of the novolac epoxy resin and the proper amount of eigen-state polyaniline are remarkably improved. The eigenstate polyaniline is a structure of polyaniline, due to the existence of a benzene ring structure, the rigidity of polyaniline molecular chains is larger, and the processability is poorer, so the processability can be effectively improved by adopting the compounding of the novolac epoxy resin, and a more stable system can be formed by compounding a plurality of components. The detection proves that the adhesive force of the protective material is 7.6-8.5MPa, and the corrosion prevention efficiency of the protective material is more than 90% when the protective material is corroded for 6 hours by a sulfuric acid solution of 2mol/L.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1: the invention discloses a structural schematic diagram of an improved structure of a tower grounding down lead of a power transmission line;
the steel wire comprises 1-steel strand, 2-first galvanized steel pipe, 3-second galvanized steel pipe, 4-waterproof sealing layer, 5-protective material layer, 6-graphite cloth, 7-ground grounding nose and 8-underground grounding nose.
Detailed Description
In order to better understand the present invention, the following examples are further provided to clearly illustrate the contents of the present invention, but the contents of the present invention are not limited to the following examples. In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art, that the present invention may be practiced without one or more of these specific details. In other instances, well-known features have not been described in order to avoid obscuring the present invention.
In the invention, novolac epoxy resin, eigen-state polyaniline, nano boron nitride, zinc phosphate, acetone, an auxiliary agent (a leveling agent and a dispersing agent), isophorone diamine, polyether amine, formaldehyde and phenol can be obtained commercially.
The eigenstate polyaniline is a structure in which a benzene ring and a quinone ring are alternately connected, and the structural formula is as follows:
Referring to fig. 1, an improved structure of a grounding downlead of a power transmission line tower comprises a steel strand 1, wherein two ends of the steel strand 1 are connected with a first galvanized steel pipe 2 and a second galvanized steel pipe 3, the other ends of the first galvanized steel pipe 2 and the second galvanized steel pipe 3 are connected with a grounding nose, a waterproof sealing layer 4 is arranged on the outer surface of one end, connected with the steel strand 1, of the first galvanized steel pipe 2 and the second galvanized steel pipe 3, a protective material layer 5 is arranged on the outer surface of the steel strand 1 and part of the outer surface of the waterproof sealing layer 4, and a graphite cloth 6 is coated on the outer surface of the protective material layer 5.
In the invention, the galvanized steel strand 1 is adopted as the steel strand 1, and the mechanical property is good.
In the invention, the thickness of the waterproof sealing layer 4 is 4-5 mm, and the coating width of the waterproof sealing layer 4 is 1-2 cm. The thickness and the width of the waterproof sealing layer 4 are not too large, and too thick or too wide are too late, so that the structural stability of the edge of the protective material layer 5 is not good; and too thin or too narrow may not effectively exert its waterproof effect. The thickness refers to the distance from the outer surface layer to the inner surface layer of the waterproof sealing layer 4, and the coating width refers to the extension length of the waterproof sealing layer 4 on the corresponding galvanized steel pipe along the axial direction of the galvanized steel pipe.
In the invention, the waterproof sealing layer 4 adopts polyurethane waterproof sealant or silicone waterproof sealant which has good waterproofness, good weather resistance and good chemical stability, and is proved to be suitable for the complex environment of soil.
In the invention, the protective material layer 5 is prepared from novolac epoxy resin, eigen-state polyaniline, nano boron nitride, zinc phosphate, an auxiliary agent, a modified curing agent and acetone. The auxiliary agent preferably adopts a leveling agent and/or a dispersing agent, the leveling agent mainly has the main function of effectively reducing the surface tension of the material, so that a coating film obtained after the material is cured is uniform, flat and smooth, and the permeation resistance of the coating is improved, and for the invention, the acetylene glycol surfactant is preferably adopted; the main function of the dispersant is wetting dispersion, the dissolution of the eigen state polyaniline and the novolac epoxy resin is improved, the dispersion performance of the nano boron nitride and the zinc phosphate is improved, the wetting and the spreading of the coating to a base surface are facilitated, the good wetting is the basis of the high adhesive force of the coating, the polyurethane high molecular dispersant is preferably adopted, for example, VOK-6461, VOK-639, other types such as sodium dodecyl sulfate and acrylate dispersant, the dispersion effect is not good, the material is easy to agglomerate, and the coating is not uniform. Any adjuvant, if used, will perform a positive effect with half the effort, but will conversely exert a negative effect. For example, a dispersant can reduce the surface tension of a coating material, improve dispersion stability, and facilitate wetting of a coating material on a base surface, but excessive use of a dispersant generates air bubbles during production and construction, and an excessive dispersant remains in a coating film after film formation to serve as a penetrant, thereby reducing water resistance and washability of the coating layer. Therefore, the content of the auxiliary of the present invention is controlled to 1 to 5 parts by weight, and the content in the material is most suitable.
In the invention, the weight parts of the novolac epoxy resin are 50-70 parts, and can be selected from: 50 parts, 52 parts, 55 parts, 58 parts, 60 parts, 62 parts, 65 parts, 68 parts and 70 parts, wherein the intrinsic polyaniline is 3-10 parts by weight, and can be selected from the following components: 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, 8 parts, 9 parts and 10 parts, wherein the total weight parts of the nanometer boron nitride and the zinc phosphate are 8-20 parts, and can be selected from the following components: 8 parts, 9 parts, 10 parts, 12 parts, 15 parts, 18 parts and 20 parts of auxiliary agent, wherein the auxiliary agent is 1-5 parts by weight, and can be selected from the following components: 1 part, 2 parts, 3 parts, 58 parts, 4 parts and 5 parts of modified curing agent, wherein the modified curing agent is 3-15 parts by weight and can be selected from the following components: 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, 10 parts, 11 parts, 12 parts, 13 parts, 14 parts and 15 parts of acetone, wherein the acetone accounts for 10-20 parts by weight, and can be selected from the following components: 10 parts, 12 parts, 13 parts, 15 parts, 16 parts, 18 parts and 20 parts.
In the invention, the weight ratio of the nano boron nitride to the zinc phosphate is (1-2): (1.5-3), optionally: 1:1.5, 1:1.8, 1:2. 1:2.5, 1: 3. 1:1. 1.5: 2. 2:1.5, 2:3; the nano boron nitride and the zinc phosphate have a synergistic anticorrosion effect in the material, and researches show that the proportion of the nano boron nitride and the zinc phosphate is more prominent in anticorrosion effect in the range, and if the proportion is improper or a single raw material is adopted, the anticorrosion effect is poorer. Therefore, the weight ratio of the two should be noted in practical configuration.
In the invention, the epoxy value of the novolac epoxy resin is 0.51-0.54mol/100g, and the softening point is 20-30 ℃. Compared with other epoxy resins, the epoxy resin has lower viscosity, and is suitable for being compounded with polyaniline to be used as an anticorrosive material.
In the invention, the modified curing agent is obtained by the following preparation method: the preparation method is characterized in that isophorone diamine and polyether amine are used as raw materials, and formaldehyde and phenol are subjected to Mannich reaction to prepare the isophorone diamine. As a preferred embodiment, the mole ratio of the isophorone diamine to the polyether amine is (1-2): 1, can select: 1:1. 1.2: 1. 1.5:1. 1.7: 1. 1.8: 1. 2.0:1. the modified curing agent can perform a crosslinking curing reaction with epoxy resin to form a compact solid coating, and the coating formed after blending with the epoxy resin can be well attached to the outer surface of a matrix, so that the adhesive force of the material is improved to more than 8.0MPa, and the modified curing agent also has certain flexibility and small viscosity, and is convenient for coating construction and thickness control.
In the present invention, preferably, the protective material layer 5 is obtained by mixing, stirring and coating novolac epoxy resin, eigen-state polyaniline, nano boron nitride, zinc phosphate, an auxiliary agent, a modified curing agent and acetone. The eigenstate polyaniline is ground and dispersed by ultrasonic wave before mixing so as to improve the mixing effect and the service performance of the coating.
In the present invention, the first galvanized steel pipe 2 is connected to an above-ground nose 7, and the second galvanized steel pipe 3 is connected to an underground ground nose 8.
Example 1
Preparing a protective material:
providing the following raw materials in parts by weight: 50 parts of novolac epoxy resin, 5 parts of eigen-state polyaniline, 4 parts of nano boron nitride, 12 parts of zinc phosphate, 1 part of acetylene glycol surfactant, 2 parts of polyurethane polymer dispersant, 6 parts of modified curing agent and 12 parts of acetone, grinding and scattering the eigen-state polyaniline, mixing with the rest raw materials, and stirring uniformly to obtain the modified nano polyaniline.
The modified curing agent is obtained by the following preparation method: the compound is prepared by taking isophorone diamine and polyether amine as raw materials, and performing Mannich reaction on the isophorone diamine, formaldehyde and phenol.
The molar ratio of the isophorone diamine to the polyether amine is 1:1.
preparing a protective material layer 5: and coating the protective material to a required position, and curing to obtain the protective material.
Example 2
Preparing a protective material:
providing the following raw materials in parts by weight: 60 parts of novolac epoxy resin, 8 parts of eigenstate polyaniline, 6 parts of nano boron nitride, 8 parts of zinc phosphate, 2 parts of acetylene glycol surfactant, 3 parts of polyurethane polymer dispersant, 10 parts of modified curing agent and 17 parts of acetone, grinding and scattering the eigenstate polyaniline, mixing with the rest raw materials, and stirring uniformly to obtain the modified polyaniline modified phenolic resin.
The modified curing agent is obtained by the following preparation method: the compound is prepared by taking isophorone diamine and polyether amine as raw materials, and performing Mannich reaction on the isophorone diamine, formaldehyde and phenol.
The molar ratio of the isophorone diamine to the polyether amine is 1.5:1.
the protective material layer 5: and (3) coating the obtained protective material on a required part, and curing to obtain the protective material.
Example 3
Preparing a protective material:
providing the following raw materials in parts by weight: 70 parts of novolac epoxy resin, 10 parts of eigenstate polyaniline, 9 parts of nano boron nitride, 9 parts of zinc phosphate, 0.5 part of acetylene glycol surfactant, 4 parts of polyurethane polymer dispersant, 15 parts of modified curing agent and 20 parts of acetone, grinding and scattering the eigenstate polyaniline, mixing with the rest raw materials, and stirring uniformly to obtain the modified polyaniline modified water dispersible agent.
The modified curing agent is obtained by the following preparation method: the compound is prepared by taking isophorone diamine and polyether amine as raw materials, and performing Mannich reaction on the isophorone diamine, formaldehyde and phenol.
The molar ratio of the isophorone diamine to the polyether amine is 2:1.
the protective material layer 5: and coating the protective material to a required position, and curing to obtain the protective material.
Comparative example 1: preparing a protective material:
providing the following raw materials in parts by weight: 50 parts of novolac epoxy resin, 5 parts of eigenstate polyaniline, 10 parts of nano boron nitride, 5 parts of zinc phosphate, 1 part of acetylene glycol surfactant, 2 parts of polyurethane high-molecular dispersant, 6 parts of modified curing agent and 12 parts of acetone, grinding and scattering the eigenstate polyaniline, mixing with the rest raw materials, and stirring uniformly to obtain the modified polyaniline modified water-soluble emulsion. Wherein the weight ratio of the nano boron nitride to the zinc phosphate is 2:1. the modified curing agent was the same as in example 1.
Comparative example 2: preparing a protective material:
providing the following raw materials in parts by weight: 50 parts of novolac epoxy resin, 5 parts of eigen-state polyaniline, 12 parts of nano boron nitride, 10 parts of zinc phosphate, 1 part of acetylene glycol surfactant, 2 parts of polyurethane polymer dispersant, 6 parts of modified curing agent and 12 parts of acetone, grinding and scattering the eigen-state polyaniline, mixing with the rest raw materials, and stirring uniformly to obtain the modified nano polyaniline. Wherein, the total weight of the nanometer boron nitride and the zinc phosphate is 22 parts. The modified curing agent was the same as in example 1.
Comparative example 3: preparing a protective material:
providing the following raw materials in parts by weight: 50 parts of novolac epoxy resin, 5 parts of eigen-state polyaniline, 4 parts of nano boron nitride, 12 parts of zinc phosphate, 1 part of acetylene glycol surfactant, 2 parts of polyurethane macromolecular dispersant, 4 parts of isophorone diamine, 2 parts of polyether amine and 12 parts of acetone, grinding and scattering the eigen-state polyaniline, mixing the ground and scattered eigen-state polyaniline with the rest raw materials, and stirring the mixture uniformly to obtain the nano-polyaniline/nano-composite material.
Comparative example 4: preparing a protective material:
providing the following raw materials in parts by weight: 50 parts of novolac epoxy resin, 15 parts of eigenstate polyaniline, 4 parts of nano boron nitride, 12 parts of zinc phosphate, 1 part of acetylene glycol surfactant, 2 parts of polyurethane high-molecular dispersant, 6 parts of modified curing agent and 12 parts of acetone, grinding and scattering the eigenstate polyaniline, mixing with the rest raw materials, and stirring uniformly to obtain the modified polyaniline modified water-soluble emulsion. The modified curing agent was the same as in example 1.
Evaluation of Performance
1) Adhesion force: the protective materials of examples 1 to 3 and comparative examples 1 to 4 were tested for adhesion to galvanized steel, using a galvanized steel sheet with a thickness of 2.0mm as the test object, according to GB/T5210-1985, using an Elcometer F106 adhesion tester, and the test results are as follows:
the results show that the binding force between the protective material and the galvanized steel sheet can reach 8.3MPa, and the adhesive force is strong. Meanwhile, the use of the curing agent has obvious influence on the adhesive force of the protective material, and the effect of the modified curing agent adopting the isophorone diamine and the polyether amine is better. In addition, although the intrinsic polyaniline has good corrosion resistance, when the addition amount is increased to a certain degree, the content of novolac epoxy resin in the coating is relatively reduced due to excessive polyaniline, and polyaniline also generates polymerization to a certain degree, which is not beneficial to uniform dispersion of polyaniline, so that the bonding force between the epoxy resin and the metal matrix is obviously reduced.
2) Corrosion resistance:
the galvanized steel sheet was used as an experimental object, the thickness of the galvanized steel sheet was 2.0mm, and the galvanized steel sheet was cut into a sheet having a width of 10mm and a length of 50 mm. The metal sheet was polished with 120 mesh sandpaper. The galvanized steel sheet was used as a blank control group, the galvanized steel sheet coated with the protective materials of examples 1 to 3 and comparative examples 1 to 4 was used as an experimental group, and a weight loss method was used as a means for testing the metal corrosion efficiency.
The method specifically comprises the following steps: weighing the mass of the metal sheet, soaking the sample sheet in 2mol/L sulfuric acid diluent at 25 ℃, corroding for 6 hours, taking out the metal sheet from the corrosive liquid, polishing the surface corrosive substances, drying and weighing. The corrosion rate of the metal was calculated from the mass before and after corrosion. And calculating according to the corrosion rate of the metal sheet with or without the protective material, thereby obtaining the corrosion prevention efficiency of the protective material to the galvanized steel.
Data records before and after the metal sheet is corroded need to be completely polished by abrasive paper, the metal sheet is washed by distilled water and then dried, and respective masses of the metal sheet and the metal sheet are weighed by an electronic balance and are accurate to three decimal places.
The non-corroded galvanized steel sheet was used as a blank control group, the corroded galvanized steel sheets of coating examples 1-3 and comparative examples 1-4 were used as experimental groups, and each group was recorded in parallel for 3 times, and the average value, the weight data before and after corrosion, and the calculation results are shown in the following table.
The calculation result shows that after the sulfuric acid diluent of 2mol/L corrodes 6H, the corrosion-resistant efficiency of the invention can reach 92.65%, and the protective material coated on the surface of the galvanized steel has a quite good protective effect. Meanwhile, the corrosion prevention effect of comparative example 1 is the worst, and secondly, comparative example 2, the two comparative examples have significant influence on the corrosion prevention effect although only the proportion and the content of the nano boron nitride and the zinc phosphate are adjusted, which indicates that the proper proportion and the content of the nano boron nitride and the zinc phosphate are very critical for obtaining the protective material with excellent corrosion prevention effect. Again, comparative examples 3 and 4 show that the adhesion of the protective material is poor in the index test, and the poor adhesion easily causes liquid penetration in the immersion of sulfuric acid, so that the protective material has poor corrosion prevention effect. The results show that the combination tightness of the protective material with large adhesive force and the matrix material is better, the effect of well isolating the corrosive environment is achieved, and the stronger the corrosion resistance is; the protective material with small adhesive force can crack and fall off, so that the coating fails, and the anti-corrosion effect can be effectively improved by improving the adhesive force of the protective material.
Although specific embodiments of the invention have been described above, it will be understood by those skilled in the art that the specific embodiments described are illustrative only and are not limiting upon the scope of the invention, and that equivalent modifications and variations can be made by those skilled in the art without departing from the spirit of the invention, which is to be limited only by the appended claims.
Claims (10)
1. The utility model provides a transmission line shaft tower ground connection downlead improves structure, includes the steel strand wires, first galvanized steel pipe and second galvanized steel pipe are connected at the both ends of steel strand wires, the ground connection nose is all connected to the other end of first galvanized steel pipe and second galvanized steel pipe, its characterized in that: the outer surface of one end of each of the first galvanized steel pipe and the second galvanized steel pipe, which is connected with the steel strand, is provided with a waterproof sealing layer, the outer surface of the steel strand and part of the outer surface of the waterproof sealing layer are provided with a protective material layer, and the outer surface of the protective material layer is coated with graphite cloth, so that the first galvanized steel pipe and the second galvanized steel pipe are not in contact with the graphite cloth.
2. The improved structure of the grounding downlead of the power transmission line tower according to claim 1, characterized in that: the thickness of the waterproof sealing layer is 4-5 mm, and the coating width of the waterproof sealing layer is 1-2 cm.
3. The improved structure of the grounding downlead of the power transmission line tower according to claim 1, characterized in that: the waterproof sealing layer is made of polyurethane waterproof sealing glue or silicone waterproof sealing glue.
4. The improved structure of the grounding downlead of the power transmission line tower according to claim 1, characterized in that: the protective material layer is prepared from phenolic epoxy resin, eigen-state polyaniline, nano boron nitride, zinc phosphate, an auxiliary agent, a modified curing agent and acetone.
5. The improved structure of the grounding down lead of the transmission line tower according to claim 4, characterized in that: the phenolic epoxy resin is 50-70 parts by weight, the eigen state polyaniline is 3-10 parts by weight, the total weight of the nano boron nitride and the zinc phosphate is 8-20 parts by weight, the auxiliary agent is 1-5 parts by weight, the modified curing agent is 3-15 parts by weight, and the acetone is 10-20 parts by weight.
6. The improved structure of the grounding down conductor of the transmission line tower as claimed in claim 4 or 5, wherein: the epoxy value of the novolac epoxy resin is 0.51-0.54mol/100g, and the softening point is 20-30 ℃.
7. The improved structure of the grounding down conductor of the transmission line tower according to claim 4 or 5, characterized in that: the modified curing agent is obtained by the following preparation method: the preparation method is characterized in that isophorone diamine and polyether amine are used as raw materials, and formaldehyde and phenol are subjected to Mannich reaction to prepare the isophorone diamine.
8. The improved structure of the grounding downlead of the transmission line tower according to claim 7, characterized in that: the mole ratio of the isophorone diamine to the polyether amine is (1-2): 1.
9. the improved structure of the grounding down conductor of the transmission line tower as claimed in claim 4 or 5, wherein: the protective material layer is obtained by mixing, stirring and coating novolac epoxy resin, eigenstate polyaniline, nano boron nitride, zinc phosphate, an auxiliary agent, a modified curing agent and acetone.
10. The improved structure of the grounding downlead of the power transmission line tower according to claim 1, characterized in that: the first galvanized steel pipe is connected with the ground grounding nose, and the second galvanized steel pipe is connected with the underground grounding nose.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110594879.7A CN113270738B (en) | 2021-05-28 | 2021-05-28 | Improved structure of grounding down lead of transmission line tower |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110594879.7A CN113270738B (en) | 2021-05-28 | 2021-05-28 | Improved structure of grounding down lead of transmission line tower |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113270738A CN113270738A (en) | 2021-08-17 |
| CN113270738B true CN113270738B (en) | 2022-10-18 |
Family
ID=77233545
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110594879.7A Active CN113270738B (en) | 2021-05-28 | 2021-05-28 | Improved structure of grounding down lead of transmission line tower |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113270738B (en) |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20020019941A (en) * | 2002-01-28 | 2002-03-13 | 조옥현 | Ground |
| CN201966332U (en) * | 2010-08-12 | 2011-09-07 | 绍兴市宇迅防雷科技有限公司 | Grounding leading-out device |
| CN203205551U (en) * | 2013-04-22 | 2013-09-18 | 潍坊市宏宇电力设备防护有限公司 | Lightning protective grounding body |
| CN204118279U (en) * | 2014-09-18 | 2015-01-21 | 河南盛煌电力设备有限公司 | Lightning protection electrode |
| CN108429019A (en) * | 2018-04-28 | 2018-08-21 | 深圳供电局有限公司 | A kind of lamination of Based on Dual-Aperture five connection device |
| CN108448362A (en) * | 2018-04-28 | 2018-08-24 | 深圳供电局有限公司 | A kind of cast bilayer compression bonding apparatus of strip armour |
| CN208444957U (en) * | 2018-08-30 | 2019-01-29 | 成都雷斯特科技有限公司 | Shaft tower base station lightning protection earthing or grounding means |
| CN208570949U (en) * | 2018-04-20 | 2019-03-01 | 深圳供电局有限公司 | A kind of cast bilayer compression bonding apparatus of strip armour |
| CN210200969U (en) * | 2019-07-22 | 2020-03-27 | 南方电网科学研究院有限责任公司 | Compound graphite alkene ground connection downlead anticorrosive device |
| CN210379456U (en) * | 2019-10-16 | 2020-04-21 | 成都英华科技有限公司 | Corrosion-resistant flexible graphite down lead |
| CN212542715U (en) * | 2020-07-20 | 2021-02-12 | 昆明宇恬科技工程有限公司 | Anticorrosive downlead device of cathodic protection |
| CN112688094A (en) * | 2020-12-31 | 2021-04-20 | 国网河南省电力公司南阳供电公司 | Anti-corrosion down lead structure for lightning protection grounding system |
-
2021
- 2021-05-28 CN CN202110594879.7A patent/CN113270738B/en active Active
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20020019941A (en) * | 2002-01-28 | 2002-03-13 | 조옥현 | Ground |
| CN201966332U (en) * | 2010-08-12 | 2011-09-07 | 绍兴市宇迅防雷科技有限公司 | Grounding leading-out device |
| CN203205551U (en) * | 2013-04-22 | 2013-09-18 | 潍坊市宏宇电力设备防护有限公司 | Lightning protective grounding body |
| CN204118279U (en) * | 2014-09-18 | 2015-01-21 | 河南盛煌电力设备有限公司 | Lightning protection electrode |
| CN208570949U (en) * | 2018-04-20 | 2019-03-01 | 深圳供电局有限公司 | A kind of cast bilayer compression bonding apparatus of strip armour |
| CN108429019A (en) * | 2018-04-28 | 2018-08-21 | 深圳供电局有限公司 | A kind of lamination of Based on Dual-Aperture five connection device |
| CN108448362A (en) * | 2018-04-28 | 2018-08-24 | 深圳供电局有限公司 | A kind of cast bilayer compression bonding apparatus of strip armour |
| CN208444957U (en) * | 2018-08-30 | 2019-01-29 | 成都雷斯特科技有限公司 | Shaft tower base station lightning protection earthing or grounding means |
| CN210200969U (en) * | 2019-07-22 | 2020-03-27 | 南方电网科学研究院有限责任公司 | Compound graphite alkene ground connection downlead anticorrosive device |
| CN210379456U (en) * | 2019-10-16 | 2020-04-21 | 成都英华科技有限公司 | Corrosion-resistant flexible graphite down lead |
| CN212542715U (en) * | 2020-07-20 | 2021-02-12 | 昆明宇恬科技工程有限公司 | Anticorrosive downlead device of cathodic protection |
| CN112688094A (en) * | 2020-12-31 | 2021-04-20 | 国网河南省电力公司南阳供电公司 | Anti-corrosion down lead structure for lightning protection grounding system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113270738A (en) | 2021-08-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Sakhri et al. | Chlorinated rubber paints for corrosion prevention of mild steel: A comparison between zinc phosphate and polyaniline pigments | |
| Alhumade et al. | Enhanced protective properties and UV stability of epoxy/graphene nanocomposite coating on stainless steel. | |
| CN109666370B (en) | Conductive anticorrosive paint containing graphene and preparation method thereof | |
| CN106497330A (en) | A kind of Graphene modified epoxy resin paint and preparation method thereof | |
| CN112778817B (en) | Corrosion-resistant coating for steel bar for marine concrete and preparation method of corrosion-resistant coating | |
| CN109608994A (en) | Graphene anticorrosive paint and preparation method thereof applied to marine settings | |
| CN113270738B (en) | Improved structure of grounding down lead of transmission line tower | |
| CN101717608B (en) | Conductive anti-corrosion coating of electric power grounding grid and preparation method thereof | |
| CN114437617A (en) | High-toughness glass flake daub and preparation method thereof | |
| CN110330863A (en) | A kind of aqueous salt spray resistance polishes and preparation method thereof | |
| CN115819943B (en) | Grounding resistance-reducing material and application method thereof | |
| CN103965746A (en) | High-temperature acid-resistant interface agent for inner wall of chimney | |
| CN105969074B (en) | A kind of anticorrosion power equipment composite coating | |
| CN102993915A (en) | 3PP (Propene Polymer) anti-corrosion epoxy powder primer and preparation method thereof | |
| CN108342110A (en) | A kind of novel redox graphene enhancing wear-proof anticorrosive paint preparation method | |
| CN109066262B (en) | preparation method of graphene modified flexible non-metal conductive grounding body | |
| CN114045100B (en) | Transmission line grounding anticorrosive material | |
| CN106050581B (en) | A kind of anticorrosive wind power generation blade | |
| CN103483525A (en) | Modified epoxy resin with corrosion resistance and wear resistance and preparation method thereof | |
| CN110629266A (en) | Preparation method of super-hydrophobic stainless steel surface with self-repairing characteristic | |
| CN107312429A (en) | A kind of preparation method of conductive aqueous polythiophene anticorrosive paint | |
| CN114410182A (en) | Preparation process of rapidly-cured conductive anticorrosive composite coating | |
| CN208489369U (en) | Earthing device of electrical equipment | |
| CN210200969U (en) | Compound graphite alkene ground connection downlead anticorrosive device | |
| CN116396662B (en) | Conductive anticorrosive composite coating and preparation method and application thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |