CN114255909B - Manufacturing method of heat-resistant grade 140 transposed conductor for vegetable oil transformer - Google Patents

Manufacturing method of heat-resistant grade 140 transposed conductor for vegetable oil transformer Download PDF

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Publication number
CN114255909B
CN114255909B CN202011002133.4A CN202011002133A CN114255909B CN 114255909 B CN114255909 B CN 114255909B CN 202011002133 A CN202011002133 A CN 202011002133A CN 114255909 B CN114255909 B CN 114255909B
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layer
paint layer
acetal
enameled wire
heat
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CN114255909A (en
Inventor
李翔
雍学东
迈克霍恩
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ASTA Elektrodraht GmbH
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ASTA Elektrodraht GmbH
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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01BCABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00Insulated conductors or cables characterised by their form
    • H01B7/0045Cable-harnesses
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01BCABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00Insulated conductors or cables characterised by their form
    • H01B7/0009Details relating to the conductive cores
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01BCABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00Insulated conductors or cables characterised by their form
    • H01B7/08Flat or ribbon cables
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01BCABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00Insulated conductors or cables characterised by their form
    • H01B7/17Protection against damage caused by external factors, e.g. sheaths or armouring
    • H01B7/18Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
    • H01B7/1805Protections not provided for in groups H01B7/182 - H01B7/26
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01BCABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00Insulated conductors or cables characterised by their form
    • H01B7/17Protection against damage caused by external factors, e.g. sheaths or armouring
    • H01B7/29Protection against damage caused by extremes of temperature or by flame
    • H01B7/292Protection against damage caused by extremes of temperature or by flame using material resistant to heat
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02ATECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A30/00Adapting or protecting infrastructure or their operation
    • Y02A30/14Extreme weather resilient electric power supply systems, e.g. strengthening power lines or underground power cables

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  • Insulating Of Coils (AREA)
  • Organic Insulating Materials (AREA)

Abstract

The invention discloses a manufacturing method of a heat-resistant grade 140 transposed conductor for a vegetable oil transformer, which comprises an outer insulating layer, a first enameled wire, central lining paper, a second enameled wire and a third enameled wire, wherein the top of an inner cavity of the outer insulating layer is provided with the first enameled wire, the left side and the right side of the bottom of the first enameled wire are symmetrically provided with enameled wire unit bodies, the central lining paper is arranged between the two groups of enameled wire unit bodies, the enameled wire unit bodies comprise the second enameled wire, the bottom of the second enameled wire is uniformly provided with the third enameled wire from top to bottom, the first enameled wire comprises a first flat copper wire, the second enameled wire comprises a second flat copper wire, the outer layer of the second flat copper wire is coated with a first acetal paint layer, the right side of the top of the first acetal paint layer is provided with a main epoxy self-adhesive paint layer, and the left side and the right side of the main epoxy self-adhesive layer are both provided with first heat-resistant paper layers.

Description

Manufacturing method of heat-resistant grade 140 transposed conductor for vegetable oil transformer
Technical Field
The invention relates to the technical field of transformer equipment, in particular to a manufacturing method of a heat-resistant grade 140 transposed conductor for a vegetable oil transformer.
Background
The transformer is a device for changing alternating voltage by utilizing the principle of electromagnetic induction, and the main components are a primary coil, a secondary coil and an iron core (magnetic core), and the main functions are as follows: voltage transformation, current transformation, impedance transformation, isolation, voltage stabilization (magnetic saturation transformer) and the like, wherein the vegetable oil transformer is a transformer in which an iron core and a winding are immersed in vegetable oil, a transposition wire is a plurality of enameled copper flat wires which are combined into two rows with wide surfaces in contact with each other, transposition is carried out on the upper surfaces and the lower surfaces of the two rows of enameled wires along the narrow surfaces in the same direction as required, and the transposition wire is formed by using an electrician insulating paper tape as a multilayer continuous tight wrapping.
In the current use process of the transposition wire in the vegetable oil transformer, the working temperature in the vegetable oil transformer is sometimes too high, so that the common transposition wire cannot meet the heat-resistant requirement and the working of the vegetable oil transformer is easy to influence.
Disclosure of Invention
The invention aims to overcome the problems in the prior art and provide a manufacturing method of a heat-resistant grade 140 transposed conductor for a vegetable oil transformer, which improves the heat resistance of the transposed conductor and is convenient for working and use in the vegetable oil transformer.
In order to achieve the technical purpose and the technical effect, the invention is realized by the following technical scheme:
the manufacturing method of the heat-resistant grade 140 transposed conductor for the vegetable oil transformer comprises an outer insulating layer, a first enameled wire, central lining paper, a second enameled wire and a third enameled wire, wherein the first enameled wire is arranged at the top of an inner cavity of the outer insulating layer, enameled wire unit bodies are symmetrically arranged at the left side and the right side of the bottom of the first enameled wire, and central lining paper is arranged between the two groups of enameled wire unit bodies;
the enameled wire unit body comprises a second enameled wire, and a third enameled wire is uniformly arranged at the bottom of the second enameled wire from top to bottom;
the first enameled wire comprises a first flat copper wire, a first acetal paint layer is coated on the outer layer of the first flat copper wire, and a first epoxy self-adhesive paint layer is coated on the outer layer of the first acetal paint layer;
the second enameled wire comprises a second flat copper wire, the outer layer of the second flat copper wire is coated with a first acetal paint layer, the right side of the top of the first acetal paint layer is provided with a first main epoxy self-adhesive paint layer, the left side and the right side of the first main epoxy self-adhesive paint layer are respectively provided with a first heat-resistant paper layer, a second acetal paint layer is coated between the first heat-resistant paper layer and the first acetal paint layer, and a second epoxy self-adhesive paint layer is coated between the second acetal paint layer and the first heat-resistant paper layer;
the third enameled wire comprises a third flat copper wire, the outer layer of the third flat copper wire is coated with a second acetal paint layer, the left side and the right side of the top of the second acetal paint layer are both provided with second heat-resistant paper layers, a main epoxy self-adhesive paint layer II is arranged between the two groups of the second heat-resistant paper layers, a third acetal paint layer is coated between the outer layer of the second acetal paint layer and the second heat-resistant paper layers, and a third epoxy self-adhesive paint layer is coated between the outer layer of the third acetal paint layer and the second heat-resistant paper layers.
Preferably, in the method for manufacturing the heat-resistant grade 140 transposed conductor for a vegetable oil transformer, the left and right side walls of the first flat copper wire, the left and right side walls of the second flat copper wire and the left and right side walls of the third flat copper wire are all semicircular, so that the structure is compact, the winding volume is reduced, and the cost is saved.
Preferably, in the method for manufacturing the heat-resistant grade 140 transposed conductor for vegetable oil transformers, the first, second, and third flat copper wires are all C 1 The level semi-hard transposed conductor has small resistivity and reduces the heat generated by work.
Preferably, in the method for manufacturing the heat-resistant grade 140 transposed conductor for a vegetable oil transformer, the first acetal paint layer, the second acetal paint layer and the third acetal paint layer are all manufactured by adopting polyester imine with the heat-resistant grade of 155 ℃, so that the whole transposed conductor can meet the heat-resistant grade of 140 ℃ and is convenient to use in the vegetable oil transformer.
Preferably, in the above manufacturing method for the heat-resistant grade 140 transposed conductor for vegetable oil transformers, the thickness of the paint film of the first acetal paint layer is 0.11-01.16 mm, the sum of the paint film thicknesses of the first acetal paint layer and the second acetal paint layer and the sum of the paint film thicknesses of the second acetal paint layer and the third acetal paint layer are equal to the paint film thickness of the first acetal paint layer, and better insulation performance is achieved within the range of the paint film thickness.
Preferably, in the method for manufacturing the heat-resistant grade 140 transposed conductor for the vegetable oil transformer, the thickness of the paint film of the first epoxy self-adhesive paint layer is 0.03-0.05 mm, the thickness of the paint film of the second epoxy self-adhesive paint layer and the thickness of the paint film of the third epoxy self-adhesive paint layer are equal to those of the paint film of the first epoxy self-adhesive paint layer, and better high-temperature resistant and self-adhesive performance is achieved within the range of the thickness of the paint film.
Compared with the prior art, the invention has the following beneficial effects:
the invention has reasonable structural design, and the first is: by selecting the first flat copper wire, the second flat copper wire and the third flat copper wire as C 1 The level semi-hard transposed conductor has small resistivity, and reduces the heat generated by work;
second,: the first acetal paint layer, the second acetal paint layer and the third acetal paint layer are all made of polyester imine with the heat-resistant grade of 155 ℃, so that the whole transposed conductor meets the heat-resistant grade requirement of 140 ℃, the heat resistance and the short circuit resistance of the transposed conductor are improved, and the transposed conductor is convenient to work and use in a vegetable oil transformer;
third,: the winding rigidity and bending strength are greatly improved by self-adhesion between the pair of second enamelled wires and the first enamelled wires through the main epoxy self-adhesion paint layer, and between the pair of third enamelled wires and the second enamelled wires and between the two longitudinally adjacent groups of third enamelled wires through the main epoxy self-adhesion paint layer.
Of course, it is not necessary for any one product to practice the invention to achieve all of the advantages set forth above at the same time.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed for the description of the embodiments 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 that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of a usage state structure of the present invention;
fig. 2 is a schematic structural view of a first enamel wire according to the present invention;
fig. 3 is a schematic structural view of a second enamel wire according to the present invention;
fig. 4 is a schematic structural view of a third enamel wire according to the present invention;
in the drawings, the list of components represented by the various numbers is as follows:
1-an outer insulating layer, 2-a first enameled wire, 201-a first flat copper wire, 202-a first acetal paint layer, 203-a first epoxy self-adhesive paint layer, 3-a center backing paper, 4-a second enameled wire, 401-a second flat copper wire, 402-a first acetal paint base layer, 403-a second acetal paint layer, 404-a second epoxy self-adhesive paint layer, 405-a first heat-resistant paper layer, 406-a main epoxy self-adhesive paint layer, 5-a third enameled wire, 501-a third flat copper wire, 502-a second acetal paint base layer, 503-a third acetal paint layer, 504-a third epoxy self-adhesive paint layer, 505-a main epoxy self-adhesive paint layer, and 506-a second heat-resistant paper layer.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention provides a technical scheme that: the manufacturing method of the heat-resistant grade 140 transposed conductor for the vegetable oil transformer comprises an outer insulating layer 1, a first enameled wire 2, a central lining paper 3, a second enameled wire 4 and a third enameled wire 5, wherein the first enameled wire 2 is arranged at the top of an inner cavity of the outer insulating layer 1, enameled wire unit bodies are symmetrically arranged at the left and right sides of the bottom of the first enameled wire 2, the central lining paper 3 is arranged between the two groups of enameled wire unit bodies, the enameled wire unit bodies comprise the second enameled wire 4, the third enameled wire 5 is uniformly arranged at the bottom of the second enameled wire 4 from top to bottom (refer to fig. 1 in the specification), the first enameled wire 2 comprises a first flat copper wire 201, the outer layer of the first flat copper wire 201 is coated with a first acetal paint layer 202, the outer layer of the first acetal paint layer 202 is coated with a first epoxy self-adhesive paint layer 203 (refer to fig. 2 in the specification), the second enameled wire 4 comprises a second flat copper wire 401, a first acetal paint layer 402 is coated on the outer layer of the second flat copper wire 401, a main epoxy paint self-adhesive paint layer 406 is arranged at the right side of the top of the first flat copper layer 402, a first heat-resistant paint layer 405 is arranged at the left and right sides of the main epoxy self-adhesive paint layer 406, a first acetal paint layer 405 is coated between the first acetal layer 403 and the first acetal layer 403,a second epoxy self-adhesive paint layer 404 is coated between the second acetal paint layer 403 and the first heat-resistant paper layer 405 (see fig. 3 in the attached drawings), the third enameled wire 5 comprises a third flat copper wire 501, the outer layer of the third flat copper wire 501 is coated with a second acetal paint bottom layer 502, the left and right sides of the top of the second acetal paint bottom layer 502 are respectively provided with a second heat-resistant paper layer 506, a main epoxy self-adhesive paint layer 505 is arranged between the two groups of second heat-resistant paper layers 506, a third acetal paint layer 503 is coated between the outer layer of the second acetal paint bottom layer 502 and the second heat-resistant paper layer 506, a third epoxy self-adhesive paint layer 504 is coated between the outer layer of the third acetal paint layer 503 and the second heat-resistant paper layer 506, the left and right side walls of the first flat copper wire 201, the left and right side walls of the second flat copper wire 401 and the left and right side walls of the third flat copper wire 501 are semicircular, the structure is compact, the winding volume is reduced, and the cost is saved, and the first flat copper wire 201, the second flat copper wire 401 and the third flat copper wire 501 are all C 1 The level semi-hard transposed conductor is small in resistivity, heat generated by working is reduced, the first acetal paint layer 202, the first acetal paint layer 402, the second acetal paint layer 403, the second acetal paint layer 502 and the third acetal paint layer 503 are all made of polyester imine with the heat-resistant level of 155 ℃, the whole transposed conductor is convenient to meet the heat-resistant level of 140 ℃, the transposed conductor is convenient to use in a vegetable oil transformer, the paint film thickness of the first acetal paint layer 202 is 0.11-01.16 mm, the sum of the paint film thicknesses of the first acetal paint layer 402 and the second acetal paint layer 403 and the sum of the paint film thicknesses of the second acetal paint layer 502 and the third acetal paint layer 503 are equal to the paint film thickness of the first acetal paint layer 202, better insulating performance is achieved in the paint film thickness range, the paint film thickness of the first epoxy self-adhesive paint layer 203 is 0.03-0.05 mm, the paint film thickness of the second epoxy self-adhesive paint layer 404 and the paint film thickness of the third epoxy self-adhesive 504 are equal to the paint film thickness of the first epoxy self-adhesive paint layer 203, and better high temperature resistance and self-adhesive performance are achieved in the paint film thickness range (see figure 4 in the specification).
One specific application of this embodiment is: the invention has reasonable structural design, and the first flat copper wire 201, the second flat copper wire 401 and the third flat copper wire 501 are all C by selecting the international standard 1 The level semi-hard transposed conductor has small resistivity, reduces the heat generated by work,through first acetal paint layer 202, acetal paint layer one 402, second acetal paint layer 403, acetal paint layer two 502 and third acetal paint layer 503 all adopt the heat-resistant class of 155 ℃ to make, be convenient for make whole transposition wire satisfy 140 ℃ heat-resistant class demand, improve transposition wire's heat resistance and anti short circuit ability, the work in vegetable oil transformer is convenient to use, carry out the self-adhesion between second enameled wire 4 and the first enameled wire 2 through main epoxy self-adhesion paint layer one 406, and carry out the self-adhesion between second epoxy self-adhesion paint layer two 505 to third enameled wire 5 and second enameled wire 4 and between two vertically adjacent groups of third enameled wires 5, the winding rigidity and the bending strength of transposition wire have been improved greatly.
In the description of the present specification, the descriptions of the terms "one embodiment," "example," "specific example," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the invention disclosed above are intended only to assist in the explanation of the invention. The preferred embodiments are not exhaustive or to limit the invention to the precise form disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best understand and utilize the invention. The invention is limited only by the claims and the full scope and equivalents thereof.

Claims (6)

1. The manufacturing method of the heat-resistant grade 140 transposed conductor for the vegetable oil transformer comprises an outer insulating layer (1), a first enameled wire (2), a central lining paper (3), a second enameled wire (4) and a third enameled wire (5), and is characterized in that: the top of the inner cavity of the outer insulating layer (1) is provided with a first enameled wire (2), enameled wire unit bodies are symmetrically arranged on the left side and the right side of the bottom of the first enameled wire (2), and a central lining paper (3) is arranged between the two groups of enameled wire unit bodies;
the enameled wire unit body comprises a second enameled wire (4), and a third enameled wire (5) is uniformly arranged at the bottom of the second enameled wire (4) from top to bottom;
the first enameled wire (2) comprises a first flat copper wire (201), a first acetal paint layer (202) is coated on the outer layer of the first flat copper wire (201), and a first epoxy self-adhesive paint layer (203) is coated on the outer layer of the first acetal paint layer (202);
the second enameled wire (4) comprises a second flat copper wire (401), an acetal paint bottom layer I (402) is coated on the outer layer of the second flat copper wire (401), a main epoxy self-adhesive paint layer I (406) is arranged on the right side of the top of the acetal paint bottom layer I (402), first heat-resistant paper layers (405) are arranged on the left side and the right side of the main epoxy self-adhesive paint layer I (406), a second acetal paint layer (403) is coated between the first heat-resistant paper layers (405) and the acetal paint bottom layer I (402), and a second epoxy self-adhesive paint layer (404) is coated between the second acetal paint layer (403) and the first heat-resistant paper layers (405);
the third enameled wire (5) comprises a third flat copper wire (501), an acetal paint bottom layer II (502) is coated on the outer layer of the third flat copper wire (501), second heat-resistant paper layers (506) are arranged on the left side and the right side of the top of the acetal paint bottom layer II (502), a main epoxy self-adhesive paint layer II (505) is arranged between the two second heat-resistant paper layers (506), a third acetal paint layer (503) is coated between the outer layer of the acetal paint bottom layer II (502) and the second heat-resistant paper layers (506), and a third epoxy self-adhesive paint layer (504) is coated between the outer layer of the third acetal paint layer (503) and the second heat-resistant paper layers (506).
2. The method for manufacturing the heat-resistant grade 140 transposed conductor for vegetable oil transformers according to claim 1, wherein the method comprises the following steps: the left and right side walls of the first flat copper wire (201), the left and right side walls of the second flat copper wire (401) and the left and right side walls of the third flat copper wire (501) are all semicircular.
3. The method for manufacturing the heat-resistant grade 140 transposed conductor for vegetable oil transformers according to claim 1, wherein the method comprises the following steps: the first flat copper wire (201), the second flat copper wire (401) and the third flat copper wire (501) are all C 1 A level semi-hard transposed conductor.
4. The method for manufacturing the heat-resistant grade 140 transposed conductor for vegetable oil transformers according to claim 1, wherein the method comprises the following steps: the first acetal paint layer (202), the first acetal paint layer (402), the second acetal paint layer (403), the second acetal paint layer (502) and the third acetal paint layer (503) are all made of polyester imine with the heat-resistant grade of 155 ℃.
5. The method for manufacturing the heat-resistant grade 140 transposed conductor for vegetable oil transformers according to claim 1, wherein the method comprises the following steps: the paint film thickness of the first acetal paint layer (202) is 0.11-01.16 mm, and the sum of the paint film thicknesses of the first acetal paint layer (402) and the second acetal paint layer (403) and the sum of the paint film thicknesses of the second acetal paint layer (502) and the third acetal paint layer (503) are equal to the paint film thickness of the first acetal paint layer (202).
6. The method for manufacturing the heat-resistant grade 140 transposed conductor for vegetable oil transformers according to claim 1, wherein the method comprises the following steps: the paint film thickness of the first epoxy self-adhesive paint layer (203) is 0.03-0.05 mm, and the paint film thickness of the second epoxy self-adhesive paint layer (404) and the paint film thickness of the third epoxy self-adhesive paint layer (504) are equal to the paint film thickness of the first epoxy self-adhesive paint layer (203).
CN202011002133.4A 2020-09-22 2020-09-22 Manufacturing method of heat-resistant grade 140 transposed conductor for vegetable oil transformer Active CN114255909B (en)

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52137682A (en) * 1976-05-13 1977-11-17 Sumitomo Electric Ind Ltd Self fusing winding
US4542064A (en) * 1983-02-28 1985-09-17 Fujikura Ltd. Self-bonding enameled wire and hermetic compressor motor using the same
CN201413693Y (en) * 2009-06-01 2010-02-24 苏州巨峰金属线缆有限公司 Self-adhesive high-thermal-conductivity single glass fiber aluminum flat wire
CN103594155A (en) * 2013-11-18 2014-02-19 保定天威线材制造有限公司 Local self-adhesive paint layer low-self-adhesive-layer transposition wire for transformer and production method
JP2017128667A (en) * 2016-01-20 2017-07-27 住友電気工業株式会社 Self-fusion resin composition and self-fusion insulated wire
CN108109727A (en) * 2017-12-07 2018-06-01 扬州苏昌机电有限公司 A kind of exhausted self-adhering-type enameled transposition conductor of paper
CN208141851U (en) * 2018-03-27 2018-11-23 阿斯塔导线有限公司 Kufil high intensity continuous transposed conductor

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52137682A (en) * 1976-05-13 1977-11-17 Sumitomo Electric Ind Ltd Self fusing winding
US4542064A (en) * 1983-02-28 1985-09-17 Fujikura Ltd. Self-bonding enameled wire and hermetic compressor motor using the same
CN201413693Y (en) * 2009-06-01 2010-02-24 苏州巨峰金属线缆有限公司 Self-adhesive high-thermal-conductivity single glass fiber aluminum flat wire
CN103594155A (en) * 2013-11-18 2014-02-19 保定天威线材制造有限公司 Local self-adhesive paint layer low-self-adhesive-layer transposition wire for transformer and production method
JP2017128667A (en) * 2016-01-20 2017-07-27 住友電気工業株式会社 Self-fusion resin composition and self-fusion insulated wire
CN108109727A (en) * 2017-12-07 2018-06-01 扬州苏昌机电有限公司 A kind of exhausted self-adhering-type enameled transposition conductor of paper
CN208141851U (en) * 2018-03-27 2018-11-23 阿斯塔导线有限公司 Kufil high intensity continuous transposed conductor

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