CN111333941A - Cable repairing reagent and using method thereof - Google Patents
Cable repairing reagent and using method thereof Download PDFInfo
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- CN111333941A CN111333941A CN202010221429.9A CN202010221429A CN111333941A CN 111333941 A CN111333941 A CN 111333941A CN 202010221429 A CN202010221429 A CN 202010221429A CN 111333941 A CN111333941 A CN 111333941A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/04—Homopolymers or copolymers of ethene
- C08L23/06—Polyethene
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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
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/09—Carboxylic acids; Metal salts thereof; Anhydrides thereof
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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
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/10—Esters; Ether-esters
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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
- C08K7/02—Fibres or whiskers
- C08K7/04—Fibres or whiskers inorganic
- C08K7/14—Glass
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G1/00—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines
- H02G1/16—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for repairing insulation or armouring of cables
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
- C08L2203/20—Applications use in electrical or conductive gadgets
- C08L2203/202—Applications use in electrical or conductive gadgets use in electrical wires or wirecoating
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/14—Polymer mixtures characterised by other features containing polymeric additives characterised by shape
- C08L2205/16—Fibres; Fibrils
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- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
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Abstract
The invention discloses a cable repair reagent, which comprises 40-70% of a basic reagent, 20-40% of a reinforcing fiber, 5-10% of a catalyst and 10-20% of an antioxidant by mass percent; the invention adopts the basic reagents with different proportions aiming at the cables with different operation years, thereby saving the cost and improving the practicability; different injection pressures are selected according to the size of the cable, the aging repair of the cable is more precise, and compared with the traditional fixed pressure, the mode of fixing the formula is more targeted, and the cable has higher economic value and use value.
Description
Technical Field
The invention relates to a cable repair reagent and a using method thereof, belonging to the field of electric power repair reagents.
Background
The existing power cable is subjected to construction, environmental factors, operation load and the like in the operation process, so that the cable is easy to age in advance, on one hand, the loss is increased, on the other hand, the insulation is further reduced, and the brewing power failure accident is caused. Cable premature aging is currently mainly a replacement and chemical liquid repair method, with replacement being the primary means.
The existing chemical liquid repairing mode has several problems, which influence the popularization:
1. the cost is high, which usually accounts for 50% of the cable cost, and the repair technology is affected by popularization concerns because large-area popularization and application are not formed;
2. no very precise means is provided in the repairing process; if different cables are used, a unified formula is adopted at present, which inevitably causes another concern: if the cable has special chemical substances inside, whether new reaction and reaction products can be formed on the chemical reagents or not, and whether the products are harmful to the continuously running cable or not;
3. the field application of the repair reagent is to roughly estimate the pressure encapsulated in the cable without considering the actual bearing capacity of the cable;
4. atmospheric pressure effects are not considered in field repairs, so the existing fixed pressure may cause high altitude cables to be over-stressed, while low altitude cables to be under-stressed, affecting the repair effect.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a cable repair reagent, which comprises the following components in percentage by mass: 40-70% of basic reagent, 20-40% of reinforced fiber, 5-10% of catalyst and 10-20% of antioxidant. .
The basic reagent is liquid silica gel, silane or nano polyethylene.
The reinforced fiber is one of glass fiber, ceramic fiber, boron nitride and polyester fiber.
The catalyst is tetraisopropoxy titanate or organic bismuth.
The antioxidant is benzoic acid or benzophenone.
When the cable operation life is less than 5 years, the proportion of the basic reagent is selected to be 40 percent; when the cable operation time is longer than five years and less than 10 years, the proportion of the basic reagent is selected from 40 to 50 percent; when the cable operation life is more than 10 years and less than 15 years, the proportion of the basic reagent is selected from 50 to 60 percent; when the cable operation life is longer than 15 years, the proportion of the basic reagent is selected from 60-70%.
The application method of the cable repair reagent comprises the following steps:
(1) heating the cable repair reagent at a temperature not lower than 45 ℃, and stirring the reagent for a time not lower than 1 min;
(2) injecting the heated cable repair reagent into the cable under the action of initial injection pressure (1.1P 0, P0 is standard atmospheric pressure), adding a catalyst with the initial mass of 0.1% of that of the catalyst into the cable repair reagent when the injection flow rate is lower than 1cm/s, wherein the total amount of the added catalyst is not higher than 2% of that of the basic reagent, and injecting the catalyst into the cable repair reagent by multiplying the initial injection pressure by 1.1-1.3;
when the injection flow rate is higher than 1cm/s, catalyst addition and pressurization injection are not needed;
(3) the injection time t (h) is calculated according to the following formula:
T=1.25×C×（L-1）/100；
wherein C is the section coefficient of the cable, and when the insulation diameter of the cable is less than 20mm, C = 0.6-0.8; when the cable insulation diameter is more than 30 and is more than or equal to 20, C = 0.5; when the cable insulation diameter is > 30, C =0.45, and L is the cable length to be repaired.
The method for using the cable repair reagent also comprises an analysis method for observing the outflow repair reagent at the tail end of the cable, and the method comprises the following steps:
(1) when the resistivity of the cable repair reagent is reduced by more than 3%, continuously injecting the cable repair reagent into the cable end until the resistivity is reduced by less than 3%, and stopping injecting the cable repair reagent into the cable end;
(2) comparing and analyzing the amplitude and phase characteristics of the cable repair reagent at the injection end and the infrared light penetrating repair reagent flowing out from the tail end by using an infrared light analysis method, and analyzing the impurities inside the cable after the cable repair reagent penetrates through the cable; under the infrared light with specific wavelength, when the difference of the intensity ratio of the cable repair agent before repair and after repair exceeds 10 percent and the phase difference increment exceeds 5 degrees, the repair is considered to produce positive effect.
The specific wavelength is 0.8 μm to 10 μm.
The invention has the advantages and technical effects that:
1. aiming at cables with different operation years, basic reagents with different proportions are adopted, so that the cost is saved, and the practicability is improved. Because a higher proportion or concentration of basic reagent is adopted for a cable with a lower operation life, the flow speed is slow, the compression degree of the cable is increased, and negative effects are generated;
2. aiming at the situation that the humidity of the field environment is changed greatly or the humidity is high and the traditional measuring method sensitive to the humidity, such as insulation resistance or dielectric loss, can not be used, the method of analyzing the outflow reagent by infrared is adopted for comparative observation, so that the environment adaptability can be improved;
3. the aspects of heating, stirring and the like are combined, and the uniformity is improved before the repairing reagent is encapsulated in the cable;
4. the pressure in the repair process is optimized; selecting different injection pressures according to the cable size;
the invention ensures that the aging repair of the cable is more precise, and compared with the traditional mode of fixing pressure and formula, the mode of fixing the formula is more targeted and has higher economic value.
Detailed Description
The present invention is further illustrated by the following examples, but the scope of the invention is not limited to the above-described examples.
Example 1: the cable repair reagent comprises 40% of liquid silica gel, 40% of glass fiber, 10% of tetra-isopropoxy titanate and 10% of benzoic acid;
the cable repair reagent of the embodiment is used for repairing a cable running for 4.5 years, and the specific method comprises the following steps:
(1) heating the cable repair reagent to 65 ℃, and stirring the reagent for 10 min;
(2) in the repairing, the initial injection pressure is 1.1 standard atmospheric pressure, the injection flow rate is 1.5cm/s, the cable to be repaired is 500m, and the insulation diameter of the cable is 25 mm;
(3) pressurizing and injecting a cable repair reagent, and calculating pressurizing and injecting time T according to the length of the cable:
t =1.25 × C × (L-1)/100, so T =1.25 × 0.5 × 4.99.99 =3h, boost injection, the original injection pressure is 1.1 atm, the boost pressure is 1.1 times of the initial pressure, i.e. the boost value is 1.1 × 1.1.1 =1.21 times of the pressure;
(3) when the resistivity of the cable repair reagent is reduced by more than 3%, continuously injecting the cable repair reagent into the cable end until the resistivity is reduced by less than 3%, and stopping injecting the cable repair reagent into the cable end;
(4) comparing and analyzing the amplitude and phase characteristics of the cable repair reagent at the injection end and the infrared light penetrating repair reagent flowing out from the tail end by using an infrared light analysis method, and analyzing the impurities inside the cable after the cable repair reagent penetrates through the cable;
under the specific wavelength (such as 1 μm) of infrared light, the data of the repaired liquid phase difference before repair is 3 degrees, the intensity ratio is 95 percent, the detected phase difference after repair is 15 degrees, the intensity ratio is 70 percent, the phase difference increment is 12 degrees, and the intensity ratio changes by 25 percent, which indicates that the repair has a positive effect.
Example 2: the cable repair reagent comprises 50% of silane, 30% of ceramic fiber, 8% of tetra-isopropoxy titanate and 12% of benzophenone;
the cable repair reagent is used for repairing a cable running for 8 years, and the specific method comprises the following steps:
(1) heating the cable repair reagent to 65 ℃, and stirring the reagent for 15 min;
(2) in the repairing, the initial injection pressure is 1.1 standard atmospheric pressure, the injection flow rate is 0.8cm/s, the cable to be repaired is 700m, and the insulation diameter of the cable is 31 mm; injecting at a flow rate lower than 1cm/s, and adding tetraisopropoxy titanate (the addition amount is 0.1 percent of the mass of the initial tetraisopropoxy titanate) into the cable repair reagent;
(3) pressurizing and injecting a cable repair reagent, and calculating pressurizing and injecting time T according to the length of the cable:
t =1.25 × C × (L-1)/100, so T =1.25 × 0.45 × 6.99.99 =3.9h, pressurized injection, the original injection pressure being 1.1 atm, the pressurized pressure being 1.1 times the initial pressure, i.e. the pressurized value being 1.1 × 1.2.2 =1.32 times the pressure;
(3) when the resistivity of the cable repair reagent is reduced by more than 3%, continuously injecting the cable repair reagent into the cable end until the resistivity is reduced by less than 3%, and stopping injecting the cable repair reagent into the cable end;
(4) comparing and analyzing the amplitude and phase characteristics of the cable repair reagent at the injection end and the infrared light penetrating repair reagent flowing out from the tail end by using an infrared light analysis method, and analyzing the impurities inside the cable after the cable repair reagent penetrates through the cable;
under the specific wavelength (such as 1 μm) of infrared light, the data of the repaired liquid phase difference before repair is 8 degrees, the intensity ratio is 95 percent, the detected phase difference after repair is 14 degrees, the intensity ratio is 75 percent, the phase difference increment is 6 degrees, and the intensity ratio changes by 20 percent, which indicates that the repair has a positive effect.
Example 3: the cable repair reagent comprises 65% of nano polyethylene, 20% of polyester fiber, 5% of organic bismuth and 10% of benzophenone;
the cable repair reagent of the embodiment is used for repairing a cable running for 16 years, and the specific method comprises the following steps:
(1) heating the cable repair reagent to 65 ℃, and stirring the reagent for 15 min;
(2) in the repairing, the initial injection pressure is 1.1 standard atmospheric pressure, the injection flow rate is 2.0cm/s, the cable to be repaired is 400m, and the insulation diameter of the cable is 20 mm;
(3) pressurizing and injecting a cable repair reagent, and calculating pressurizing and injecting time T according to the length of the cable:
t =1.25 × C × (L-1)/100, so T =1.25 × 0.5 × 3.99.99 =2.5h, boost injection, the original injection pressure is 1.1 atm, the boost pressure is 1.1 times of the initial pressure, i.e. the boost value is 1.1 × 1.2.2 =1.32 times of the pressure;
(3) when the resistivity of the cable repair reagent is reduced by more than 3%, continuously injecting the cable repair reagent into the cable end until the resistivity is reduced by less than 3%, and stopping injecting the cable repair reagent into the cable end;
(4) comparing and analyzing the amplitude and phase characteristics of the cable repair reagent at the injection end and the infrared light penetrating repair reagent flowing out from the tail end by using an infrared light analysis method, and analyzing the impurities inside the cable after the cable repair reagent penetrates through the cable;
under the specific wavelength (such as 10 microns) of infrared light, the data of the repaired liquid phase difference before repair is 30 degrees, the intensity ratio is 80 percent, the detected phase difference after repair is 45 degrees, the intensity ratio is 65 percent, the phase difference increment is 15 degrees, and the intensity ratio is changed by 15 percent, which indicates that the repair has a positive effect.
It should be added that, after the repair liquid passes through the cable, the liquid contains impurities inside the cable, even if the cable is not aged obviously, the phase difference and the amplitude difference of the repair liquid flowing out from the end of the cable can be changed through analysis, and experience accumulation shows that the method is reasonable by taking the change of the intensity ratio of more than 10% and the phase difference increment of more than 5 degrees as a scale, but if a more accurate monitoring and analyzing method is provided, the more accurate analysis of the amplitude and phase offset of the liquid flowing out from the end of the cable is realized, so that the determination condition value to which the method belongs is better limited and is also within the protection scope of the application.
Claims (10)
1. A cable repair reagent is characterized by comprising the following components in percentage by mass: 40-70% of basic reagent, 20-40% of reinforced fiber, 5-10% of catalyst and 10-20% of antioxidant.
2. The cable repair agent according to claim 1, wherein: the basic reagent is liquid silica gel, silane or nano polyethylene.
3. The cable repair agent according to claim 2, wherein: the reinforced fiber is one of glass fiber, ceramic fiber, boron nitride and polyester fiber.
4. The cable repair agent according to claim 3, wherein: the catalyst is tetraisopropoxy titanate or organic bismuth.
5. The cable repair agent according to claim 4, wherein: the antioxidant is benzoic acid or benzophenone.
6. The cable repair agent according to claim 5, wherein: when the cable operation life is less than 5 years, the proportion of the basic reagent is selected to be 40 percent; when the cable operation time is longer than five years and less than 10 years, the proportion of the basic reagent is selected from 40 to 50 percent; when the cable operation life is more than 10 years and less than 15 years, the proportion of the basic reagent is selected from 50 to 60 percent; when the cable operation life is longer than 15 years, the proportion of the basic reagent is selected from 60-70%.
7. The method of using the cable repair agent of claim 1, comprising the steps of:
(1) heating the cable repair reagent at a temperature not lower than 45 ℃, and stirring the reagent for a time not lower than 1 min;
(2) injecting the heated cable repair reagent into a cable under the action of initial injection pressure, adding a catalyst with the initial mass of 0.1% of that of the catalyst into the cable repair reagent when the injection flow rate is lower than 1cm/s, wherein the addition amount of the catalyst is not higher than 2% of that of the basic reagent, and injecting the catalyst into the cable repair reagent according to the multiplication of the initial injection pressure of 1.1-1.3;
when the injection flow rate is higher than 1cm/s, catalyst addition and pressurization injection are not needed;
(3) the injection time t (h) is calculated according to the following formula:
T=1.25×C×（L-1）/100；
wherein C is the section coefficient of the cable, and when the insulation diameter of the cable is less than 20mm, C = 0.6-0.8; when the cable insulation diameter is more than 30 and is more than or equal to 20, C = 0.5; when the cable insulation diameter is > 30, C =0.45, and L is the cable length to be repaired.
8. The method of using a cable repair agent according to claim 7, wherein: the initial injection pressure was 1.1 atm.
9. The method of using a cable repair reagent according to claim 8, further comprising an analytical method of observing the outflow of the repair reagent at the end of the cable:
(1) when the resistivity of the cable repair reagent is reduced by more than 3%, continuously injecting the cable repair reagent into the cable end until the resistivity is reduced by less than 3%, and stopping injecting the cable repair reagent into the cable end;
(2) comparing and analyzing the amplitude and phase characteristics of the infrared light penetrating repair reagent of the cable repair reagent at the injection end and the cable repair reagent flowing out from the tail end by using an infrared light analysis method; under the infrared light with specific wavelength, when the difference of the intensity ratio of the cable repair agent before repair and after repair exceeds 10 percent and the phase difference increment exceeds 5 degrees, the repair is considered to produce positive effect.
10. Use according to claim 9, characterized in that: the specific wavelength is 0.8 μm to 10 μm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010221429.9A CN111333941A (en) | 2020-03-26 | 2020-03-26 | Cable repairing reagent and using method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010221429.9A CN111333941A (en) | 2020-03-26 | 2020-03-26 | Cable repairing reagent and using method thereof |
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| CN111333941A true CN111333941A (en) | 2020-06-26 |
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| CN202010221429.9A Pending CN111333941A (en) | 2020-03-26 | 2020-03-26 | Cable repairing reagent and using method thereof |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080173467A1 (en) * | 2007-01-19 | 2008-07-24 | Novinium, Inc. | Acid-catalyzed dielectric enhancement fluid and cable restoration method employing same |
| CN102618037A (en) * | 2012-02-17 | 2012-08-01 | 四川大学 | Power cable repair liquid capable of automatically generating nano-particles, preparation method for power cable repair liquid and application |
| CN105037911A (en) * | 2015-07-28 | 2015-11-11 | 浙江万马高分子材料有限公司 | Easy-peel highlighted silane crosslinking flame-retardant polyolefin insulation material, preparation method and application thereof |
-
2020
- 2020-03-26 CN CN202010221429.9A patent/CN111333941A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080173467A1 (en) * | 2007-01-19 | 2008-07-24 | Novinium, Inc. | Acid-catalyzed dielectric enhancement fluid and cable restoration method employing same |
| CN102618037A (en) * | 2012-02-17 | 2012-08-01 | 四川大学 | Power cable repair liquid capable of automatically generating nano-particles, preparation method for power cable repair liquid and application |
| CN105037911A (en) * | 2015-07-28 | 2015-11-11 | 浙江万马高分子材料有限公司 | Easy-peel highlighted silane crosslinking flame-retardant polyolefin insulation material, preparation method and application thereof |
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