CN112280306B - Liquid repairing agent for improving electric corrosion of water-blocking buffer belt of high-voltage and ultrahigh-voltage cable, and preparation method, filling equipment and filling method thereof - Google Patents
Liquid repairing agent for improving electric corrosion of water-blocking buffer belt of high-voltage and ultrahigh-voltage cable, and preparation method, filling equipment and filling method thereof Download PDFInfo
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- CN112280306B CN112280306B CN202011138605.9A CN202011138605A CN112280306B CN 112280306 B CN112280306 B CN 112280306B CN 202011138605 A CN202011138605 A CN 202011138605A CN 112280306 B CN112280306 B CN 112280306B
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/04—Carbon
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/34—Silicon-containing compounds
- C08K3/36—Silica
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K7/00—Use of ingredients characterised by shape
- C08K7/16—Solid spheres
- C08K7/18—Solid spheres inorganic
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K9/00—Use of pretreated ingredients
- C08K9/04—Ingredients treated with organic substances
- C08K9/06—Ingredients treated with organic substances with silicon-containing compounds
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/28—Protection against damage caused by moisture, corrosion, chemical attack or weather
- H01B7/2806—Protection against damage caused by corrosion
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/28—Protection against damage caused by moisture, corrosion, chemical attack or weather
- H01B7/282—Preventing penetration of fluid, e.g. water or humidity, into conductor or cable
- H01B7/285—Preventing penetration of fluid, e.g. water or humidity, into conductor or cable by completely or partially filling interstices in the cable
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/002—Physical properties
- C08K2201/003—Additives being defined by their diameter
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
Abstract
The invention discloses a liquid repairing agent for improving electric corrosion of a water-blocking buffer belt of a high-voltage and ultrahigh-voltage cable, and a preparation method, a filling device and a filling method of the liquid repairing agent, and belongs to the technical field of repairing of the water-blocking buffer belt of the cable. The technical scheme is as follows: comprises 40-80% of polydimethylsiloxane; 5% -40% of graphite particles; 10% -20% of silicon dioxide spheres; 1% -3% of silane coupling agent; placing graphite particles, silicon dioxide spheres and a silane coupling agent into a stirrer, adding absolute ethyl alcohol, fully stirring, drying to obtain mixed powder, adding polydimethylsiloxane into the mixed powder, and placing the mixed powder in a three-roll grinder for grinding and dispersing to obtain the liquid repairing agent. The liquid repair agent is injected between the corrugated aluminum sheath and the insulated wire core by a filling device. The invention can obviously improve the electric corrosion condition of the cable water-blocking buffer belt, has simple construction, short period and low requirement on environment, can greatly reduce the repair cost of the cable and prolong the service life of the cable.
Description
Technical Field
The invention belongs to the technical field of repair of water-blocking buffer belts of cables, and particularly relates to a liquid repair agent for improving electric corrosion of a water-blocking buffer belt of a high-voltage and ultrahigh-voltage cable, and a preparation method, a filling device and a filling method thereof.
Background
Moisture can get into the buffering area that blocks water in the processing and the storage process of 110kV and above high-voltage cable for the buffering area that blocks water inflation powder that absorbs water inflation, and partial separation can appear between the two-layer semi-conductive non-woven fabrics of buffering area that blocks water, makes the buffering area that blocks water resistance increase. In the cable which runs or generates the electric corrosion of the water-blocking buffer belt, the increase of the resistance of the water-blocking buffer belt causes the potential difference between the cable insulation shielding layer and the corrugated aluminum sheath, the potential difference is not enough to cause the discharge, but the potential difference causes the current to flow through the resistance, the resistance generates heat, the water-blocking buffer belt is locally damaged by the final heat, and the cable breakdown is caused in severe cases.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the defects of the prior art are overcome, and the liquid repairing agent, the preparation method, the filling equipment and the filling method for improving the electric corrosion of the water-blocking buffer belt of the high-voltage and ultrahigh-voltage cable are provided, so that the electric corrosion condition of the water-blocking buffer belt of the cable is improved.
The technical scheme of the invention is as follows:
in a first aspect, the invention provides a liquid repairing agent for improving the electric corrosion of a water-blocking buffer belt of a high-voltage and ultrahigh-voltage cable, which comprises the following components:
the mass ratio of the polydimethylsiloxane is 40-80 percent;
the mass ratio of the graphite particles is 5-40%;
the mass ratio of the silicon dioxide spheres is 10-20 percent;
the mass ratio of the silane coupling agent is 1-3%.
Preferably, the polydimethylsiloxane has a kinematic viscosity of 10 to 100mm at 25 ℃2/S。
Preferably, the graphite particles have a particle size of 1-20 μm.
Preferably, the silica spheres have a particle size of 10-50 nm.
According to the second aspect, the invention provides a preparation method of a liquid repairing agent for improving electric corrosion of a water-blocking buffer belt of a high-voltage and ultrahigh-voltage cable, which comprises the steps of weighing the components in proportion, putting graphite particles, silica spheres and a silane coupling agent into a stirrer, adding absolute ethyl alcohol, fully stirring, then putting the mixture into a drying room at the temperature of 60-70 ℃ for drying for 4-8 hours to obtain mixed powder, adding polydimethylsiloxane into the mixed powder, and putting the mixture into a three-roll grinder for grinding and dispersing to obtain the liquid repairing agent.
The invention provides a filling device of a liquid repairing agent for improving the electric corrosion of a water-blocking buffer belt of a high-voltage ultrahigh-voltage cable, which is characterized by comprising a filling device body, a device connecting pipe and a sealing clamp, wherein the sealing clamp comprises a first sealing clamp and a second sealing clamp, the first sealing clamp and the second sealing clamp respectively comprise semicircular shells, connecting plates are respectively arranged on two sides of each shell, the first sealing clamp and the second sealing clamp are detachably connected through the connecting plates, and a repairing agent inlet and outlet is arranged on each shell of the first sealing clamp; the filling equipment body is connected with the repairing agent liquid inlet and outlet through an equipment connecting pipe.
Preferably, the sealing clamp is 150-.
Preferably, after the first sealing clamp and the second sealing clamp are connected together, the gap between the shell and the outer diameter of the cable insulation core or the corrugated aluminum sheath is 2-3 mm.
Preferably, two sealing grooves are oppositely arranged on the shell of the second sealing clamp along the length direction, and silicone rubber sealing strips are filled in the sealing grooves.
In a fourth aspect, the invention provides a filling method of the liquid repairing agent for improving the electric corrosion of the water-blocking buffer belt of the high-voltage and ultrahigh-voltage cable,
s1: stripping the outer sheath 350 and 450mm of the cable from the two ends of the cable which runs or generates the water-blocking buffer belt electric corrosion, and exposing the corrugated aluminum sheath;
s2: stripping off the 150-250mm corrugated aluminum sheath along the direction of the solution filling, and exposing the water-blocking buffer belt;
s3: stripping off the 100-200mm water-blocking buffer tape along the direction of the solution filling to expose the insulated wire core;
s4: along the direction of filling solution, winding and fastening 50-100mm of the exposed corrugated aluminum sheath and 100-150mm of the exposed insulated wire core by using an insulated self-adhesive tape according to the overlapping rate of not less than 10 percent, wherein the winding thickness is 2-5 mm;
s5: symmetrically stripping the other end of the cable which runs or generates the water-blocking buffer belt electric corrosion by the same method of S1-S4;
s6: placing a sealing clamp at the position where the insulating self-adhesive tape is wound, and connecting a first sealing clamp and a second sealing clamp, wherein the joint gap between the first sealing clamp and the second sealing clamp is not more than 1 mm; fully stirring the prepared liquid repairing agent solution, adding the solution into a filling equipment body, connecting a liquid outlet of the filling equipment body with a repairing agent inlet and outlet at one end of a cable by using an equipment connecting pipe, keeping the repairing agent inlet and outlet at the other end of the cable in an open state, filling the liquid repairing agent between the corrugated aluminum sheath and the insulated wire core by using the filling equipment, continuing to fill for 10-30min when the repairing agent inlet and outlet in the open state flows out of the liquid repairing agent, stopping the machine, standing for 24h, and finishing filling.
Compared with the prior art, the invention has the following beneficial effects: (1) by adopting the liquid repairing agent and the filling method thereof, the situation that the cable water-blocking buffer belt is corroded electrically due to resistance heating caused by the potential difference formed by the water-blocking buffer belt between the cable insulation shielding layer and the corrugated aluminum sheath can be obviously improved, and the probability of cable failure due to electric corrosion is greatly reduced; (2) the technology disclosed by the invention is simple in construction, short in period and low in environmental requirement, and can greatly reduce the repair cost of the cable water-blocking buffer tape and prolong the service life of the cable; (3) the silane coupling agent is added to form a layer of film on the surface of the graphite particles, so that the graphite particles have better dispersibility and are not easy to agglomerate; polydimethylsiloxane as a diluent for the binder; the conductive capability of the repairing agent can be enhanced by adding the graphite particles; the addition of the silica balls makes the grinding more fully uniform.
Drawings
FIG. 1 is a schematic illustration of the filling structure of the present invention.
FIG. 2 is a schematic view of the processing head of the present invention.
Fig. 3 is a schematic cross-sectional view of a first sealing jig of the present invention.
Fig. 4 is a schematic cross-sectional view of a first sealing clamp of the present invention.
Fig. 5 is a schematic cross-sectional view of a second sealing jig of the present invention.
Fig. 6 is a schematic cross-sectional view of a second sealing jaw of the present invention.
In the figure, 1-cable outer sheath; 2-corrugated aluminum sheathing; 3-insulating self-adhesive tape; 4-a repairing agent liquid inlet and outlet; 5-connecting plates; 6-a water-blocking buffer tape; 7-an insulated wire core; 8-equipment connecting pipe; 9-filling equipment body; 10-seal groove.
Detailed Description
Examples 1 to 4 and comparative example 1
The components of the liquid repairing agent for improving the electric corrosion of the water blocking buffer tape of the high-voltage extra-high-voltage cables in the examples 1 to 4 and the comparative example are shown in the following table 1:
TABLE 1
After the components are weighed according to the proportion, firstly placing graphite particles, silicon dioxide spheres and a silane coupling agent into a stirrer, adding absolute ethyl alcohol, fully stirring, then placing the stirrer in a drying room at the temperature of 60-70 ℃ to dry for 4-8 hours to obtain mixed powder, adding polydimethylsiloxane into the mixed powder, and placing the mixed powder in a three-roll grinder to grind and disperse to obtain the liquid repairing agent. In the preparation process, the graphite particles of comparative example 1 have poor dispersibility and are easy to agglomerate, while the graphite particles of examples 1 to 4 have good dispersibility and are not easy to agglomerate, because the silane coupling agent is added to form a layer of film on the surface of the graphite particles, so that the graphite particles have better dispersibility and are not easy to agglomerate.
Example 5
The embodiment provides a filling device for filling a liquid repairing agent of embodiments 1 to 4, which comprises a filling device body 9, a device connecting pipe 8 and sealing clamps, wherein each sealing clamp comprises a first sealing clamp and a second sealing clamp, each first sealing clamp and each second sealing clamp comprise semicircular shells, connecting plates 5 are respectively arranged on two sides of each shell, the first sealing clamp and the second sealing clamp are connected through threads arranged on the connecting plates 5, and a repairing agent inlet and outlet 4 is arranged on each shell of the first sealing clamp; the filling equipment body is connected with the repairing agent liquid inlet and outlet 4 through an equipment connecting pipe 8.
The using method comprises the following steps:
s1: stripping the outer sheath 1 of the cable from two ends of the cable which runs or generates the water-blocking buffer belt electric corrosion, wherein the length of the outer sheath is 350-450mm, and the corrugated aluminum sheath 2 is exposed;
s2: stripping the 150-250mm corrugated aluminum sheath 2 along the direction of the solution filling to expose the water-blocking buffer belt 6;
s3: stripping the 100-200mm water-blocking buffer tape 6 along the direction of the solution filling to expose the insulated wire core 7;
s4: along the direction of filling solution, winding and fastening the exposed corrugated aluminum sheath at the position of 250-100mm and the exposed insulated wire core 7 at the position of 100-150mm by using an insulated self-adhesive tape 3 according to the overlapping rate of not less than 10 percent, wherein the winding thickness is 3-5mm, and the insulated self-adhesive tape plays a role in sealing and protecting the cable;
s5: symmetrically stripping the other end of the cable which runs or generates the water-blocking buffer belt electric corrosion by the same method of S1-S4;
s6: placing a sealing clamp at the position where the insulating self-adhesive tape 3 is wound, and connecting a first sealing clamp and a second sealing clamp, wherein the joint clearance between the first sealing clamp and the second sealing clamp is not more than 1 mm; fully stirring the prepared liquid repairing agent solution, adding the solution into a filling equipment body 9, connecting a liquid outlet of the filling equipment body 9 with a repairing agent inlet and outlet 4 at one end of a cable by using an equipment connecting pipe 8, keeping the repairing agent inlet and outlet 4 at the other end of the cable in an open state, filling the liquid repairing agent between the corrugated aluminum sheath 2 and the insulating wire core 7 through filling equipment, continuing to fill for 10-30min when the repairing agent inlet and outlet 4 in the open state flows out of the liquid repairing agent, stopping the machine, standing for 24h, and finishing filling.
Claims (7)
1. The liquid repairing agent for improving the electric corrosion of the water-blocking buffer belt of the high-voltage and ultrahigh-voltage cable is characterized by comprising the following components in percentage by mass:
40% -80% of polydimethylsiloxane;
5% -40% of graphite particles;
10% -20% of silicon dioxide spheres;
1% -3% of silane coupling agent;
the kinematic viscosity of polydimethylsiloxane at 25 ℃ is 10-100mm2/S；
The particle size of the graphite particles is 1-20 mu m;
the particle size of the silicon dioxide spheres is 10-50 nm.
2. The method for preparing the liquid repairing agent for improving the electric erosion of the water blocking buffer belt of the high-voltage and ultrahigh-voltage cable according to claim 1, wherein after the components are weighed, the graphite particles, the silica spheres and the silane coupling agent are placed in a stirrer, absolute ethyl alcohol is added, the mixture is fully stirred, then the mixture is placed in a drying room at the temperature of 60-70 ℃ and dried for 4-8 hours, mixed powder is obtained, polydimethylsiloxane is added into the mixed powder, and the mixture is placed in a three-roll grinder for grinding and dispersing, so that the liquid repairing agent is obtained.
3. The filling equipment for improving the liquid repairing agent of the high-voltage and ultrahigh-voltage cable water-blocking buffer belt galvanic corrosion as claimed in claim 1, comprising a filling equipment body (9), an equipment connecting pipe (8) and sealing clamps, wherein the sealing clamps comprise a first sealing clamp and a second sealing clamp, the first sealing clamp and the second sealing clamp both comprise semicircular shells, two sides of each shell are respectively provided with a connecting plate (5), the first sealing clamp and the second sealing clamp are detachably connected through the connecting plate (5), and the shell of the first sealing clamp is provided with a repairing agent liquid inlet and outlet (4); the filling equipment body (9) is connected with the repairing agent liquid inlet and outlet (4) through an equipment connecting pipe (8).
4. The apparatus for improving the liquid repairing agent for the electric corrosion of the water blocking buffer belt of the extra-high voltage cable as claimed in claim 3, wherein the length of the sealing clamp is 150-250 mm.
5. The filling equipment of the liquid repairing agent for improving the electric corrosion of the water blocking buffer belt of the high-voltage and ultrahigh-voltage cable as claimed in claim 3, wherein after the first sealing clamp and the second sealing clamp are connected together, the clearance between the outer shell and the outer diameter of the cable insulation core (7) or the corrugated aluminum sheath (2) is 2-3 mm.
6. The filling equipment of the liquid repairing agent for improving the electric corrosion of the water blocking buffer belt of the high-voltage and ultrahigh-voltage cable as claimed in claim 3, wherein two sealing grooves (10) are oppositely arranged on the outer shell of the second sealing clamp along the length direction, and a silicone rubber sealing strip is filled in each sealing groove (10).
7. A method for filling a liquid repairing agent for improving the electric corrosion of a water blocking buffer belt of a high-voltage extra-high-voltage cable by using the filling equipment as claimed in claim 3,
s1: stripping the outer sheath (1) of the cable for 350-450mm from one end of the cable which runs or generates the water-blocking buffer belt electric corrosion, and exposing the corrugated aluminum sheath (2);
s2: along the direction of the filling solution, the 150-250mm corrugated aluminum sheath (2) is stripped to expose the semi-conductive buffer
A belt (6);
s3: stripping the 100-200mm water-blocking buffer tape (6) along the direction of the filling solution to expose the insulated wire core (7);
s4: along the direction of filling solution, winding and fastening 50-100mm of the exposed corrugated aluminum sheath (2) and 100-150mm of the exposed insulating wire core (7) by adopting an insulating self-adhesive tape (3) according to the covering rate of not less than 10 percent, wherein the winding thickness is 2-5 mm;
s5: symmetrically stripping the other end of the cable which runs or generates the water-blocking buffer belt electric corrosion by the same method of S1-S4;
s6: placing a sealing clamp at the position of winding the insulating self-adhesive tape (3), and connecting a first sealing clamp and a second sealing clamp, wherein the joint gap between the first sealing clamp and the second sealing clamp is not more than 1 mm; fully stirring the prepared liquid repairing agent solution, adding the solution into a filling equipment body (9), connecting a liquid outlet of the filling equipment body (9) with a repairing agent liquid inlet and outlet (4) at one end of the cable by using an equipment connecting pipe (8), keeping the repairing agent liquid inlet and outlet (4) at the other end of the cable in an open state, filling the liquid repairing agent between the corrugated aluminum sheath (2) and the insulating wire core (7) through the filling equipment, continuing to fill for 10-30min when the repairing agent liquid inlet and outlet (4) in the open state flows out of the liquid repairing agent, stopping the machine, standing for 24h, and finishing filling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011138605.9A CN112280306B (en) | 2020-10-22 | 2020-10-22 | Liquid repairing agent for improving electric corrosion of water-blocking buffer belt of high-voltage and ultrahigh-voltage cable, and preparation method, filling equipment and filling method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011138605.9A CN112280306B (en) | 2020-10-22 | 2020-10-22 | Liquid repairing agent for improving electric corrosion of water-blocking buffer belt of high-voltage and ultrahigh-voltage cable, and preparation method, filling equipment and filling method thereof |
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| CN112280306A CN112280306A (en) | 2021-01-29 |
| CN112280306B true CN112280306B (en) | 2022-04-22 |
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| KR101363589B1 (en) * | 2005-04-29 | 2014-02-13 | 유틸스 코포레이션 | Electrical cable restoration fluid |
| CN101866706B (en) * | 2010-06-08 | 2011-08-31 | 四川大学 | Cross-linked polyethylene power cable nano repairing liquid and repairing method thereof |
| CN107275991B (en) * | 2017-07-24 | 2021-02-05 | 广州番禺电缆集团有限公司 | Cable repairing device and cable repairing method |
| CN107337982A (en) * | 2017-08-23 | 2017-11-10 | 国网山东省电力公司荣成市供电公司 | A kind of nanometer power cable repairs liquid |
| CN111718582A (en) * | 2020-04-15 | 2020-09-29 | 国网安徽省电力有限公司电力科学研究院 | Aluminum core power cable repair liquid, preparation method, repair device and repair method |
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