CN112331385A - Low-loss power cable and manufacturing method and application thereof - Google Patents

Low-loss power cable and manufacturing method and application thereof Download PDF

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CN112331385A
CN112331385A CN202011188953.7A CN202011188953A CN112331385A CN 112331385 A CN112331385 A CN 112331385A CN 202011188953 A CN202011188953 A CN 202011188953A CN 112331385 A CN112331385 A CN 112331385A
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power cable
low
conductor material
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巨佳
王章忠
胡亮
闫晨
于皓
刘欢
李旋
李华冠
强新发
吴萌
刘敏敏
陈慧敏
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Nanjing Institute of Technology
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    • H—ELECTRICITY
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    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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    • C22C1/03—Making non-ferrous alloys by melting using master alloys
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C9/00—Alloys based on copper
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/002—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working by rapid cooling or quenching; cooling agents used therefor
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/08—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of copper or alloys based thereon
    • H—ELECTRICITY
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    • H01B13/02—Stranding-up
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    • H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/06—Insulating conductors or cables
    • H01B13/14—Insulating conductors or cables by extrusion
    • H01B13/148—Selection of the insulating material therefor
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/22—Sheathing; Armouring; Screening; Applying other protective layers
    • H01B13/26—Sheathing; Armouring; Screening; Applying other protective layers by winding, braiding or longitudinal lapping
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    • H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
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    • H01B7/26—Reduction of losses in sheaths or armouring
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B9/00—Power cables
    • H01B9/02—Power cables with screens or conductive layers, e.g. for avoiding large potential gradients
    • H01B9/021—Features relating to screening tape per se
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B9/00—Power cables
    • H01B9/02—Power cables with screens or conductive layers, e.g. for avoiding large potential gradients
    • H01B9/023—Power cables with screens or conductive layers, e.g. for avoiding large potential gradients composed of helicoidally wound tape-conductors

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Abstract

The invention discloses a low-loss power cable which comprises a conductor material layer, an XLPE insulating layer, a metal shielding layer, a wrapping lining layer and a flame-retardant outer sheath layer which are sequentially arranged from inside to outside. The invention also discloses a manufacturing method of the low-loss power cable, which comprises the following steps: s1, adopting high-strength low-loss conductor material wires to be twisted in the positive and negative directions to serve as a conductor material layer of a power cable; s2, drawing out microporous modified cross-linked polyethylene on the surface of the conductor material layer by using extrusion equipment to serve as an XLPE insulating layer; s3, winding an Al-Si alloy flat belt outside the XLPE insulating layer to serve as a metal shielding layer; and S4, extruding a layer of modified polytetrafluoroethylene at the periphery of the metal shielding layer to serve as a wrapping lining layer. The invention also discloses application of the low-loss power cable in a high-speed railway cable and/or a submarine cable. The invention has the characteristics of low resistance loss, low dielectric loss, low sheath loss and the like.

Description

Low-loss power cable and manufacturing method and application thereof
Technical Field
The invention relates to a low-loss power cable and a manufacturing method and application thereof, belonging to the technical field of power cables.
Background
The power cable must produce the loss in service to arouse and generate heat, the cable temperature risees, therefore the heat dissipation problem of cable need be considered in laying of cable, guarantee that the cable can not lead to insulating ageing accelerating because of the overtemperature in service, the cable life-span shortens, and the cable destroys at once even. And factors influencing the temperature field of the cable are complex and changeable, and the current-carrying capacity of the cable is difficult to accurately determine.
Particularly, high-speed railway cables and submarine cables are manufactured in large lengths, laid in long distances and wide intervals, and metal sheaths cannot be connected in a segmented or crossed mode to ground, so that great circulation loss is caused to the metal sheaths of the cables, and happy layered structures made of ferromagnetic materials generate great eddy current loss, so that great loss is caused, and although the cables are laid in natural environments with good heat dissipation, the conductor temperature of the cables is still high, and the current-carrying capacity of the cables is severely limited. Therefore, for the long distance transmission of the power cable, how to reduce the transmission loss becomes a difficult problem for the development of the high speed railway cable and the submarine cable.
In view of the above, there is a need to develop a power cable with low loss and suitable for long distance transmission, which can be applied to the field of high speed railway and submarine cable.
Disclosure of Invention
The invention aims to solve the technical problem of providing a low-loss power cable which has the characteristics of low resistance loss, low dielectric loss, low sheath loss and the like.
Meanwhile, the invention provides a manufacturing method of the low-loss power cable, and the cable manufactured by the method can solve the problem of high cable loss in the long-distance transmission process.
Meanwhile, the invention provides an application of the low-loss power cable in a high-speed railway cable and/or a submarine cable.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
the utility model provides a low-loss power cable, includes conductor material layer, XLPE insulating layer, metallic shield layer, around package inner liner and fire-retardant oversheath layer that sets gradually from inside to outside.
The conductor material layer is made of high-strength low-loss conductor material wires through positive and negative twisting.
The XLPE insulating layer is made of microporous modified cross-linked polyethylene.
The wrapping lining layer is made of modified polytetrafluoroethylene.
A method of manufacturing a low loss power cable comprising the steps of:
s1, adopting high-strength low-loss conductor material wires to be twisted in the positive and negative directions to serve as a conductor material layer of a power cable;
s2, drawing out microporous modified cross-linked polyethylene on the surface of the conductor material layer by using extrusion equipment to serve as an XLPE insulating layer;
s3, winding an Al-Si alloy flat belt outside the XLPE insulating layer to serve as a metal shielding layer;
s4, extruding a layer of modified polytetrafluoroethylene on the periphery of the metal shielding layer to serve as a wrapping inner liner layer;
and S5, extruding a layer of polytetrafluoroethylene on the periphery of the wrapping inner liner layer to serve as a flame-retardant outer sheath layer, and forming a final product.
A manufacturing method of a low-loss power cable comprises the following raw materials in percentage by mass:
Figure BDA0002752161860000021
the preparation method of the high-strength low-loss conductor material wire comprises the following steps:
s1, alloy smelting: proportioning raw materials according to a ratio, mixing Cu, Ag and CuCe intermediate alloys, heating to 1580-1620 ℃ for smelting, adding CuCr, CuTi intermediate alloys and a simple substance W according to a mass ratio of 2:1:1 after the intermediate alloys are fully molten, heating to 1960-2010 ℃ for fully smelting until the intermediate alloys are fully molten, and obtaining a smelting alloy liquid;
s2, continuous casting and rolling: controlling the casting temperature to be 1890-1920 ℃ and the pulling speed to be 4.1-4.8 m/min, and casting the S1 smelted alloy liquid into an alloy rod; then, continuously rolling, namely performing rough rolling and finish rolling by a finishing mill set, arranging a water cooling device in the process, controlling the initial rolling temperature to be 1250-1280 ℃, controlling the finish rolling temperature to be 1080-1130 ℃, and simultaneously ensuring that the finish rolling total surface reduction rate is more than or equal to 60% to obtain an alloy wire;
s3, pressure processing: and (4) drawing the alloy wire obtained in the step (S2) into a wire drawing die, and performing wire drawing treatment, wherein the wire drawing deformation rate is 60-75%, and the wire drawing temperature is 410-450 ℃, so as to obtain the alloy wire.
S4, performance heat treatment: drawing the alloy wire processed under the pressure of S3 into a performance heat treatment combination furnace, and then, feeding the alloy wire into an induction heat treatment tunnel furnace at the temperature of 880-960 ℃ for 50-70 min; and then entering a quenching tank for rapid cooling to obtain the high-strength low-loss conductor material wire.
The rapid cooling speed of the quenching tank is 5-8 ℃/s.
Cu which is continuously distributed is formed at the grain boundary of the wire surface of the high-strength low-loss conductor material wire51Ag14Ce7Alloy phase, wherein a large amount of Cr is dispersed and distributed around the grain boundary of the high-strength low-loss conductor material wire2A TiW alloy phase.
The preparation method of the microporous modified crosslinked polyethylene for the XLPE insulating layer comprises the following steps:
s1, introducing a polyethylene monomer into a polymerization kettle in a gas phase, wherein the polyethylene monomer is continuously added, the adding flow rate is 180-190 mL/min, the adding time is 8-14 min, the temperature in the kettle is adjusted to 32-38 ℃, then 5-10 g/L sodium thiosulfate is added, and the polymerization reaction is started;
s2, continuously adding a polyethylene monomer and nano manganese sulfide in the polymerization reaction process, wherein the added polyethylene monomer is a gas phase, the added polyethylene monomer is continuously added, and the adding flow is 55-67 mL/min; and (3) adding the supplemented nano manganese sulfide as a solid phase, continuously adding the supplemented nano manganese sulfide, keeping the adding flow at 5-11 mg/min, keeping the pressure of the polymerization reaction at 0.79-0.88 MPa, keeping the time of the polymerization reaction at 3-4 h, then mechanically stirring for coagulation, washing with water, and drying to obtain the microporous modified crosslinked polyethylene with the pore diameter of 50-80 microns.
The preparation method of the modified polytetrafluoroethylene for the wrapping inner liner comprises the following steps:
s1, introducing a tetrafluoroethylene monomer and a hexafluoropropylene monomer into a polymerization kettle in a mixed gas phase with a volume ratio of 4.5:1.2, continuously adding the tetrafluoroethylene monomer and the hexafluoropropylene monomer, wherein the adding flow rate of the tetrafluoroethylene monomer is 180-220 mL/min, the adding time is 12-18 min, adjusting the temperature in the kettle to 33-38 ℃, then adding 8-10 g/L of sodium metabisulfite, and starting to carry out polymerization reaction;
s2, continuously and continuously replenishing a gas-phase tetrafluoroethylene monomer, a gas-phase hexafluoropropylene monomer and a solid-phase magnesium carbonate whisker in the polymerization reaction process, wherein the flow rate of the replenished tetrafluoroethylene monomer is 60-70 mL/min; the flow rate of the supplemented hexafluoropropylene monomer is 100-108 mL/min; the supplemented solid-phase magnesium carbonate crystal whisker is 1.2-1.8 mg/min, and the length of the crystal whisker is 10-30 nm; keeping the pressure of the polymerization reaction at 0.77-0.82 MPa, keeping the time of the polymerization reaction at 90-100 min, diluting the obtained dispersion after polymerization with water to the concentration of 440-460 g/L, adjusting the temperature to 25-35 ℃, mechanically stirring for coagulation, washing with water, and drying to obtain the modified polytetrafluoroethylene.
Use of a low loss power cable in a high speed railway cable and/or a submarine cable.
The invention has the following beneficial effects:
1. low resistance loss: according to the conductor material of the power cable, the Ag, Ce and W are designed in the preparation process, and in the smelting and subsequent continuous casting and rolling processes, W which does not react with Cu is preferentially solidified at the grain boundary, so that the defect energy at the grain boundary is increased, and the separation of large Cu blocks at the grain boundary is promoted51Ag14Ce7An alloy phase. The phases are elongated in the drawing direction by a drawing force and penetrate each other during the subsequent press working, forming a continuous distribution state. Due to Cu51Ag14Ce7The alloy phase belongs to a multi-electron layer phase, has more free electrons, has a great enhancement effect on the conductivity of the conductor material when being continuously distributed at the alloy crystal boundary, and greatly reduces the resistance of the system, so that the loss of the conductor material caused by the resistance in the power transmission process is obviously reduced, and the whole power transmission loss of the power cable is greatly reduced.
2. Low dielectric loss: the XLPE insulating layer of the power cable is composed of microporous modified cross-linked polyethylene. The cross-linked polyethylene is modified to form a microporous composite nano manganese sulfide structure, the dielectric constant of the structure is greatly reduced, and the dielectric loss caused by high dielectric constant of the insulating material is obviously improved.
3. Low sheath loss: the Al-Si alloy flat belt is wound outside the insulating layer of the power cable to serve as a metal shielding layer. The existence of Si in the metal shielding layer greatly reduces the conductivity of the metal shielding layer, and in an alternating magnetic field generated by taking a conductor material as a center, induced current formed in the Al-Si alloy flat belt is obviously weakened, so that the influence on the conductor material is weakened, and the power transmission loss formed by the induced current is greatly reduced.
Drawings
Fig. 1 is a schematic view of a low loss power cable according to the present invention;
fig. 2 is a schematic structural view of a high strength low loss conductor material filament according to the present invention;
fig. 3 is a microstructure of a high strength low loss conductor material filament according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clear, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. The specific embodiments described herein are merely illustrative of the invention and are not intended to be limiting.
Example 1:
as shown in fig. 1, the low-loss power cable comprises a conductor material layer 1, an XLPE insulating layer 2, a metal shielding layer 3, a wrapping lining layer 4 and a flame-retardant outer sheath layer 5 which are sequentially arranged from inside to outside.
As shown in fig. 2, the conductor material layer 1 is made of high-strength low-loss conductor material wires twisted in opposite directions.
The XLPE insulating layer 2 is made of microporous modified cross-linked polyethylene.
The wrapping lining layer 4 is made of modified polytetrafluoroethylene.
The metal shielding layer 3 is formed by winding an Al-Si alloy flat belt.
The flame-retardant outer sheath layer 5 is made of polytetrafluoroethylene.
A method of manufacturing a low loss power cable comprising the steps of:
s1, adopting high-strength low-loss conductor material wires to be twisted in the positive and negative directions to serve as a conductor material layer 1 of the power cable;
s2, drawing microporous modified cross-linked polyethylene on the surface of the conductor material layer 1 by using extrusion equipment to serve as an XLPE insulating layer 2;
s3, winding an Al-Si alloy flat belt outside the XLPE insulating layer 2 to serve as a metal shielding layer 3;
s4, extruding a layer of modified polytetrafluoroethylene on the periphery of the metal shielding layer 3 to serve as a wrapping lining layer 4;
and S5, extruding a layer of polytetrafluoroethylene serving as a flame-retardant outer sheath layer 5 from the periphery of the wrapping inner liner layer 4 to form a final product.
A manufacturing method of a low-loss power cable comprises the following raw materials in percentage by mass: ag: 1.46 percent; w: 2.9 percent; CuCe: 2.8 percent; CuCr: 5.7 percent; and (3) CuTi: 2.9 percent; cu: the balance;
the preparation method of the high-strength low-loss conductor material wire comprises the following steps:
s1, alloy smelting: mixing the raw materials according to a ratio, heating the intermediate alloy of Cu, Ag and CuCe to 1580 ℃ for smelting, adding the intermediate alloy of CuCr and CuTi and the simple substance W according to a mass ratio of 2:1:1 after the intermediate alloy is fully molten, heating to 1960 ℃ for full smelting until the intermediate alloy is fully molten to obtain a smelting alloy liquid;
s2, continuous casting and rolling: controlling the casting temperature to 18900 ℃ and the drawing speed to be 4.1m/min, and casting the S1 molten alloy liquid into an alloy rod; then, continuous rolling is carried out, the alloy wire is rolled by a rough rolling unit and a finishing rolling unit, a water cooling device is arranged in the process, the initial rolling temperature is controlled at 1250 ℃, the finish rolling temperature is controlled at 1080 ℃, and meanwhile, the total reduction rate of finish rolling is ensured to be 60 percent, so that an alloy wire is obtained;
s3, pressure processing: and (4) drawing the alloy wire obtained in the step (S2) into a wire drawing die, and drawing the alloy wire at the wire drawing temperature of 410 ℃ to obtain the alloy wire, wherein the wire drawing deformation rate is 60%.
S4, performance heat treatment: drawing the alloy wire processed under the pressure of S3 into a performance heat treatment combination furnace, and then entering an induction heat treatment tunnel furnace at the temperature of 880 ℃ for 50 min; and then entering a quenching tank for rapid cooling to obtain the high-strength low-loss conductor material wire.
As shown in fig. 3, the high-strength low-loss conductor material wire forms a continuous distribution of Cu at the wire surface grain boundaries51Ag14Ce7Alloy phase, wherein a large amount of Cr is dispersed and distributed around the grain boundary of the high-strength low-loss conductor material wire2A TiW alloy phase.
The preparation method of the microporous modified crosslinked polyethylene for the XLPE insulating layer 2 comprises the following steps:
s1, introducing a polyethylene monomer into a polymerization kettle in a gas phase, wherein the polyethylene monomer is continuously added, the adding flow rate is 180mL/min, the adding time is 8min, the temperature in the kettle is adjusted to 32 ℃, and then 5g/L sodium thiosulfate is added to start a polymerization reaction;
s2, continuously adding a polyethylene monomer and nano manganese sulfide in the polymerization reaction process, wherein the added polyethylene monomer is a gas phase, the added polyethylene monomer is continuously added, and the adding flow rate is 55 mL/min; and (3) adding the supplemented nano manganese sulfide as a solid phase at a flow rate of 5mg/min, maintaining the pressure of the polymerization reaction at 0.79MPa for 3h, mechanically stirring for coagulation, washing with water, and drying to obtain the microporous modified crosslinked polyethylene with the pore diameter of 50-55 microns.
The preparation method of the modified polytetrafluoroethylene for the wrapping lining layer 4 comprises the following steps:
s1, introducing a tetrafluoroethylene monomer and a hexafluoropropylene monomer into a polymerization kettle in a mixed gas phase with a volume ratio of 4.5:1.2, continuously adding the tetrafluoroethylene monomer and the hexafluoropropylene monomer, wherein the adding flow rate of the tetrafluoroethylene monomer is 180mL/min, the adding time is 12min, adjusting the temperature in the kettle to 33 ℃, then adding 8g/L sodium metabisulfite, and starting to carry out polymerization reaction;
s2, continuously and continuously replenishing a gas-phase tetrafluoroethylene monomer, a gas-phase hexafluoropropylene monomer and a solid-phase magnesium carbonate whisker in the polymerization reaction process, wherein the flow rate of the replenished tetrafluoroethylene monomer is 60 mL/min; the flow rate of the supplemented hexafluoropropylene monomer is 100 mL/min; the supplemented solid-phase magnesium carbonate crystal whisker is 1.2mg/min, and the length of the crystal whisker is 10-15 nm; keeping the pressure of the polymerization reaction at 0.77MPa and the time of the polymerization reaction at 90min, diluting the dispersion obtained after polymerization with water to the concentration of 440g/L, adjusting the temperature to 25 ℃, mechanically stirring and coagulating, washing with water, and drying to obtain the modified polytetrafluoroethylene.
Use of a low loss power cable in a high speed railway cable and/or a submarine cable.
The power cable of this example was subjected to performance testing, the results of which are shown in table 1 below:
table 1 performance of the power cable of this example
Figure BDA0002752161860000071
Therefore, the power cable prepared by the embodiment can be used for long-distance transmission and has the characteristics of low resistance loss, low dielectric loss, low sheath loss and the like.
Example 2:
this example differs from example 1 only in that:
a manufacturing method of a low-loss power cable comprises the following raw materials in percentage by mass: ag: 3.77 percent; w: 4.3 percent; CuCe: 4.7 percent; CuCr: 9.6 percent; and (3) CuTi: 4.3 percent; cu: the balance;
the preparation method of the high-strength low-loss conductor material wire comprises the following steps:
s1, alloy smelting: proportioning raw materials according to a ratio, mixing Cu, Ag and CuCe intermediate alloys, heating to 1620 ℃ for smelting, adding CuCr, CuTi intermediate alloys and a simple substance W according to a mass ratio of 2:1:1 after the intermediate alloys are fully molten, heating to 2010 ℃, and fully smelting until the intermediate alloys are fully molten to obtain a smelting alloy liquid;
s2, continuous casting and rolling: controlling the casting temperature to 1920 ℃ and the drawing speed to 4.8m/min, and casting the S1 smelted alloy liquid into an alloy rod; then, continuously rolling, namely, rolling by a rough rolling unit and a finishing rolling unit, arranging a water cooling device in the process, controlling the initial rolling temperature at 1280 ℃, controlling the finish rolling temperature at 1130 ℃, and simultaneously ensuring that the total reduction rate of finish rolling is 65 percent to obtain an alloy wire;
s3, pressure processing: and (4) drawing the alloy wire obtained in the step (S2) into a wire drawing die, and carrying out wire drawing treatment, wherein the wire drawing deformation rate is 75%, and the wire drawing temperature is 450 ℃, so as to obtain the alloy wire.
S4, performance heat treatment: drawing the alloy wire processed under the pressure of S3 into a performance heat treatment combination furnace, and then entering an induction heat treatment tunnel furnace at the temperature of 960 ℃ for 70 min; and then entering a quenching tank for rapid cooling to obtain the high-strength low-loss conductor material wire.
The preparation method of the microporous modified crosslinked polyethylene for the XLPE insulating layer 2 comprises the following steps:
s1, introducing a polyethylene monomer into a polymerization kettle in a gas phase, wherein the polyethylene monomer is continuously added, the adding flow rate is 190mL/min, the adding time is 14min, the temperature in the kettle is adjusted to 38 ℃, and then 10g/L sodium thiosulfate is added to start a polymerization reaction;
s2, continuously adding a polyethylene monomer and nano manganese sulfide in the polymerization reaction process, wherein the added polyethylene monomer is a gas phase, the added polyethylene monomer is continuously added, and the adding flow is 67 mL/min; and (3) adding the supplemented nano manganese sulfide as a solid phase at a flow rate of 11mg/min, maintaining the pressure of the polymerization reaction at 0.88MPa for 4h, mechanically stirring for coagulation, washing with water, and drying to obtain the microporous modified crosslinked polyethylene with the pore diameter of 70-80 microns.
The preparation method of the modified polytetrafluoroethylene for the wrapping lining layer 4 comprises the following steps:
s1, introducing a tetrafluoroethylene monomer and a hexafluoropropylene monomer into a polymerization kettle in a mixed gas phase with a volume ratio of 4.5:1.2, continuously adding the tetrafluoroethylene monomer and the hexafluoropropylene monomer, wherein the adding flow rate of the tetrafluoroethylene monomer is 220mL/min, the adding time is 18min, adjusting the temperature in the kettle to 38 ℃, then adding 10g/L sodium metabisulfite, and starting to carry out polymerization reaction;
s2, continuously and continuously replenishing a gas-phase tetrafluoroethylene monomer, a gas-phase hexafluoropropylene monomer and a solid-phase magnesium carbonate whisker in the polymerization reaction process, wherein the flow rate of the replenished tetrafluoroethylene monomer is 70 mL/min; the flow rate of the supplemented hexafluoropropylene monomer is 108 mL/min; the supplemented solid-phase magnesium carbonate whisker is 1.8mg/min, and the length of the whisker is 25-30 nm; keeping the pressure of the polymerization reaction at 0.82MPa and the time of the polymerization reaction at 100min, diluting the dispersion obtained after polymerization with water to the concentration of 460g/L, adjusting the temperature to 35 ℃, mechanically stirring and coagulating, washing with water, and drying to obtain the modified polytetrafluoroethylene.
The power cable of this example was subjected to performance testing, the results of which are shown in table 2 below:
table 2 performance of the power cable of the present embodiment
Figure BDA0002752161860000091
Therefore, the power cable prepared by the embodiment can be used for long-distance transmission and has the characteristics of low resistance loss, low dielectric loss, low sheath loss and the like.
Example 3:
this example differs from example 1 only in that:
a manufacturing method of a low-loss power cable comprises the following raw materials in percentage by mass: ag: 2.56 percent; w: 3.4 percent; CuCe: 4.5 percent; CuCr: 6.8 percent; and (3) CuTi: 3.4 percent; cu: the balance;
the preparation method of the high-strength low-loss conductor material wire comprises the following steps:
s1, alloy smelting: proportioning raw materials according to a ratio, mixing Cu, Ag and CuCe intermediate alloys, heating to 1600 ℃ for smelting, adding CuCr, CuTi intermediate alloys and a simple substance W according to a mass ratio of 2:1:1 after the intermediate alloys are fully molten, heating to 2000 ℃, and fully smelting until the intermediate alloys are fully molten to obtain a molten alloy liquid;
s2, continuous casting and rolling: controlling the casting temperature to 1900 ℃ and the drawing speed to be 4.5m/min, and casting the S1 smelted alloy liquid into an alloy rod; then, continuously rolling, namely, performing rough rolling and finish rolling by a finish rolling unit, arranging a water cooling device in the process, controlling the initial rolling temperature to 1265 ℃, controlling the finish rolling temperature to 1100 ℃, and simultaneously ensuring that the total reduction rate of finish rolling is 70% to obtain an alloy wire;
s3, pressure processing: and (4) drawing the alloy wire obtained in the step (S2) into a wire drawing die, and drawing the alloy wire at the wire drawing deformation rate of 70% and the wire drawing temperature of 430 ℃ to obtain the alloy wire.
S4, performance heat treatment: drawing the alloy wire processed under the pressure of S3 into a performance heat treatment combination furnace, and then entering an induction heat treatment tunnel furnace at the temperature of 920 ℃ for 60 min; and then entering a quenching tank for rapid cooling to obtain the high-strength low-loss conductor material wire.
Example 4:
this example differs from example 3 only in that:
a manufacturing method of a low-loss power cable comprises the following raw materials in percentage by mass: ag: 1.92 percent; w: 4.0 percent; CuCe: 3.1 percent; CuCr: 8.0 percent; and (3) CuTi: 4.0 percent; cu: and (4) the balance.
Example 5:
this example differs from example 3 only in that:
a manufacturing method of a low-loss power cable comprises the following raw materials in percentage by mass: ag: 3.59 percent; w: 3.15 percent; CuCe: 4.58 percent; CuCr: 6.30 percent; and (3) CuTi: 3.15 percent; cu: and (4) the balance.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (10)

1. A low loss power cable, characterized by: including conductor material layer, XLPE insulating layer, metallic shield layer, around package inner liner and fire-retardant oversheath layer that sets gradually from inside to outside.
2. A low loss power cable according to claim 1, wherein: the conductor material layer is made of high-strength low-loss conductor material wires through positive and negative twisting.
3. A low loss power cable according to claim 1, wherein: the XLPE insulating layer is made of microporous modified cross-linked polyethylene.
4. A low loss power cable according to claim 1, wherein: the wrapping lining layer is made of modified polytetrafluoroethylene.
5. A manufacturing method of a low-loss power cable is characterized by comprising the following steps: the method comprises the following steps:
s1, adopting high-strength low-loss conductor material wires to be twisted in the positive and negative directions to serve as a conductor material layer of a power cable;
s2, drawing out microporous modified cross-linked polyethylene on the surface of the conductor material layer by using extrusion equipment to serve as an XLPE insulating layer;
s3, winding an Al-Si alloy flat belt outside the XLPE insulating layer to serve as a metal shielding layer;
s4, extruding a layer of modified polytetrafluoroethylene on the periphery of the metal shielding layer to serve as a wrapping inner liner layer;
and S5, extruding a layer of polytetrafluoroethylene on the periphery of the wrapping inner liner layer to serve as a flame-retardant outer sheath layer, and forming a final product.
6. A method of manufacturing a low loss power cable according to claim 5, wherein: the high-strength low-loss conductor material wire comprises the following raw materials in percentage by mass:
Figure FDA0002752161850000011
the preparation method of the high-strength low-loss conductor material wire comprises the following steps:
s1, alloy smelting: proportioning raw materials according to a ratio, mixing Cu, Ag and CuCe intermediate alloys, heating to 1580-1620 ℃ for smelting, adding CuCr, CuTi intermediate alloys and a simple substance W according to a mass ratio of 2:1:1 after the intermediate alloys are fully molten, heating to 1960-2010 ℃ for fully smelting until the intermediate alloys are fully molten, and obtaining a smelting alloy liquid;
s2, continuous casting and rolling: controlling the casting temperature to be 1890-1920 ℃ and the pulling speed to be 4.1-4.8 m/min, and casting the S1 smelted alloy liquid into an alloy rod; then, continuously rolling, namely performing rough rolling and finish rolling by a finishing mill set, arranging a water cooling device in the process, controlling the initial rolling temperature to be 1250-1280 ℃, controlling the finish rolling temperature to be 1080-1130 ℃, and simultaneously ensuring that the finish rolling total surface reduction rate is more than or equal to 60% to obtain an alloy wire;
s3, pressure processing: and (4) drawing the alloy wire obtained in the step (S2) into a wire drawing die, and performing wire drawing treatment, wherein the wire drawing deformation rate is 60-75%, and the wire drawing temperature is 410-450 ℃, so as to obtain the alloy wire.
S4, performance heat treatment: drawing the alloy wire processed under the pressure of S3 into a performance heat treatment combination furnace, and then, feeding the alloy wire into an induction heat treatment tunnel furnace at the temperature of 880-960 ℃ for 50-70 min; and then entering a quenching tank for rapid cooling to obtain the high-strength low-loss conductor material wire.
7. A method of manufacturing a low loss power cable according to claim 6, wherein: cu which is continuously distributed is formed at the grain boundary of the wire surface of the high-strength low-loss conductor material wire51Ag14Ce7Alloy phase, wherein a large amount of Cr is dispersed and distributed around the grain boundary of the high-strength low-loss conductor material wire2A TiW alloy phase.
8. A method of manufacturing a low loss power cable according to claim 5, wherein: the preparation method of the microporous modified crosslinked polyethylene for the XLPE insulating layer comprises the following steps:
s1, introducing a polyethylene monomer into a polymerization kettle in a gas phase, wherein the polyethylene monomer is continuously added, the adding flow rate is 180-190 mL/min, the adding time is 8-14 min, the temperature in the kettle is adjusted to 32-38 ℃, then 5-10 g/L sodium thiosulfate is added, and the polymerization reaction is started;
s2, continuously adding a polyethylene monomer and nano manganese sulfide in the polymerization reaction process, wherein the added polyethylene monomer is a gas phase, the added polyethylene monomer is continuously added, and the adding flow is 55-67 mL/min; and (3) adding the supplemented nano manganese sulfide as a solid phase, continuously adding the supplemented nano manganese sulfide, keeping the adding flow at 5-11 mg/min, keeping the pressure of the polymerization reaction at 0.79-0.88 MPa, keeping the time of the polymerization reaction at 3-4 h, then mechanically stirring for coagulation, washing with water, and drying to obtain the microporous modified crosslinked polyethylene with the pore diameter of 50-80 microns.
9. A method of manufacturing a low loss power cable according to claim 5, wherein: the preparation method of the modified polytetrafluoroethylene for the wrapping inner liner comprises the following steps:
s1, introducing a tetrafluoroethylene monomer and a hexafluoropropylene monomer into a polymerization kettle in a mixed gas phase with a volume ratio of 4.5:1.2, continuously adding the tetrafluoroethylene monomer and the hexafluoropropylene monomer, wherein the adding flow rate of the tetrafluoroethylene monomer is 180-220 mL/min, the adding time is 12-18 min, adjusting the temperature in the kettle to 33-38 ℃, then adding 8-10 g/L of sodium metabisulfite, and starting to carry out polymerization reaction;
s2, continuously and continuously replenishing a gas-phase tetrafluoroethylene monomer, a gas-phase hexafluoropropylene monomer and a solid-phase magnesium carbonate whisker in the polymerization reaction process, wherein the flow rate of the replenished tetrafluoroethylene monomer is 60-70 mL/min; the flow rate of the supplemented hexafluoropropylene monomer is 100-108 mL/min; the supplemented solid-phase magnesium carbonate crystal whisker is 1.2-1.8 mg/min, and the length of the crystal whisker is 10-30 nm; keeping the pressure of the polymerization reaction at 0.77-0.82 MPa, keeping the time of the polymerization reaction at 90-100 min, diluting the obtained dispersion after polymerization with water to the concentration of 440-460 g/L, adjusting the temperature to 25-35 ℃, mechanically stirring for coagulation, washing with water, and drying to obtain the modified polytetrafluoroethylene.
10. Use of a low loss power cable according to claim 1 in high speed railway cables and/or submarine cables.
CN202011188953.7A 2020-10-30 2020-10-30 Low-loss power cable and manufacturing method and application thereof Withdrawn CN112331385A (en)

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JPH0935553A (en) * 1995-07-14 1997-02-07 Natl Res Inst For Metals Manufacture of oxide superconducting wire rod
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CN1856588A (en) * 2003-09-19 2006-11-01 住友金属工业株式会社 Copper alloy and method for production thereof
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CN103606405A (en) * 2013-11-21 2014-02-26 无锡市明珠电缆有限公司 35kV and below novel environment-friendly type middle voltage fireproof cable and production method thereof
CN103724772A (en) * 2013-12-19 2014-04-16 安徽特力电缆有限公司 Low-temperature-resistant modified polyethylene cable sheath material
CN104829905A (en) * 2015-04-21 2015-08-12 蚌埠天光传感器有限公司 Corrosion-resistant silane crosslinked polyethylene cable material and preparation method therefor
CN111087672A (en) * 2019-12-20 2020-05-01 周璇 Preparation method of modified crosslinked polyethylene insulated wire and cable

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0935553A (en) * 1995-07-14 1997-02-07 Natl Res Inst For Metals Manufacture of oxide superconducting wire rod
CN1856588A (en) * 2003-09-19 2006-11-01 住友金属工业株式会社 Copper alloy and method for production thereof
WO2006104152A1 (en) * 2005-03-28 2006-10-05 Sumitomo Metal Industries, Ltd. Copper alloy and process for producing the same
CN202307295U (en) * 2011-11-04 2012-07-04 安徽新亚特电缆集团有限公司 Novel environmental protection boat power cable
CN103606405A (en) * 2013-11-21 2014-02-26 无锡市明珠电缆有限公司 35kV and below novel environment-friendly type middle voltage fireproof cable and production method thereof
CN103724772A (en) * 2013-12-19 2014-04-16 安徽特力电缆有限公司 Low-temperature-resistant modified polyethylene cable sheath material
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CN111087672A (en) * 2019-12-20 2020-05-01 周璇 Preparation method of modified crosslinked polyethylene insulated wire and cable

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