CN220873273U - Film-covered square stranded wire for high-current reactor winding - Google Patents

Film-covered square stranded wire for high-current reactor winding Download PDF

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Publication number
CN220873273U
CN220873273U CN202322479040.6U CN202322479040U CN220873273U CN 220873273 U CN220873273 U CN 220873273U CN 202322479040 U CN202322479040 U CN 202322479040U CN 220873273 U CN220873273 U CN 220873273U
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China
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stranded
conductor
film
monofilament
bodies
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CN202322479040.6U
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张宇航
黄晓军
叶波
甘玉波
姚礼杰
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Anhui Shangwei Cable Co ltd
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Anhui Shangwei Cable Co ltd
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Abstract

The utility model provides a film-covered square stranded wire for a high-current reactor winding, which comprises a stranded wire body, wherein the stranded wire body sequentially comprises a conductor unit, an insulating layer and a protective layer from inside to outside; the conductor unit comprises at least two groups of stacked stranded bodies, an outer film is sleeved outside the stacked stranded bodies, the stranded bodies are formed by arranging a plurality of conductor monomers into two rows of stranding, an inner film is sleeved outside the stranded bodies, and flexible rubber filler is arranged between the stranded conductor monomers and the inner film; each conductor monomer is formed by round copper monofilaments with high purity and high resistivity to form a monofilament wire core, and a layer of monofilament insulating film is overlapped and wrapped outside the monofilament wire core. The special film wrapping tape material is adopted to wrap the conductor, so that insulation resistance can be ensured between the monofilament wire core and the monofilament wire core after stranding and profiling, a small capacitance structure is formed, and the conductor resistance is more stable; and the conductor monofilaments are not conducted with each other, so that the electric performance of the conductor monofilaments is ensured, the whole winding size is smaller, and the eddy current loss is reduced.

Description

Film-covered square stranded wire for high-current reactor winding
Technical Field
The utility model mainly relates to the technical field of dry reactors, in particular to a film covered square stranded wire for a high-current reactor winding.
Background
The ultra-high voltage transmission technology is a world leading technical system of China after high-speed rail and nuclear power, and the reactor is used as one of core equipment of an ultra-high voltage transmission system, and mainly plays roles in improving reactive compensation of a power grid, reducing power grid loss and improving transmission quality. The extra-high voltage circuit must be equipped with a special dry reactor, the key component is a winding wire, and the traditional material is a flat round aluminum wire.
The traditional reactor is formed by winding single-strand multiple wires in parallel, the coil diameter of the dry reactor is large, the required wire length reaches kilometers, in the winding after winding in parallel, the diameter difference of each adjacent inner side and outer side wire winding can reach the width of 2 wires, after winding a plurality of layers, the length and the resistance of each wire can be greatly different, eddy current can be generated in the wires in the operation process, and the large electric energy loss is caused, so that the energy is not beneficial to saving, and moreover, due to the limitation of impurities and defects existing in the wires, the common wire winding and the reactor can only be used on a 66kV power grid and are not suitable for the fields of ultra-high voltage and ultra-high voltage.
Disclosure of utility model
The technical scheme of the utility model aims at the technical problem that the prior art is too single, provides a solution which is obviously different from the prior art, and mainly provides a film-covered square stranded wire for a high-current reactor winding, which is used for solving the technical problem in the prior art.
The technical scheme adopted for solving the technical problems is as follows:
The film-covered square stranded wire for the high-current reactor winding comprises a stranded wire body, wherein the stranded wire body sequentially comprises a conductor unit, an insulating layer and a protective layer from inside to outside; the conductor unit comprises at least two groups of stacked stranded bodies, an outer film is sleeved outside the stacked stranded bodies, the stranded bodies are formed by arranging a plurality of conductor monomers into two rows of stranding, an inner film is sleeved outside the stranded bodies, and flexible rubber filler is arranged between the stranded conductor monomers and the inner film; each conductor monomer is formed into a monofilament wire core by high-purity and high-resistivity round copper monofilaments, and a layer of monofilament insulating film is overlapped and wrapped outside the monofilament wire core.
Preferably, the breaking elongation of the monofilament wire core is more than or equal to 38%, the wrapping covering rate of the monofilament insulating film is 52-56%, and the wrapping angle is 30-60 ℃.
Preferably, the outer film and the inner film are both polyester films or polyimide films, and the flexible rubber filler is coated at the corner position of the stranded body.
Preferably, the insulating layer is formed by overlapping and wrapping light environment-friendly insulating strips with high strength and excellent breakdown field strength, the insulating layer is at least provided with two layers, the adjacent two layers are opposite in wrapping direction, the thickness of each insulating layer strip is not more than 0.025mm, wrapping covering rates are 52% -55%, the tensile strength of the insulating layer is not less than 45N/cm, and the elongation is not less than 120%.
Preferably, the protective layer is formed by overlapping and wrapping halogen-free strips which are environment-friendly and excellent in adhesion with epoxy resin.
Compared with the prior art, the utility model has the beneficial effects that:
(1) The special film wrapping tape material is adopted for wrapping the conductor, so that insulation resistance can be ensured between the monofilament wire core and the monofilament wire core after stranding and profiling, a small capacitance structure is formed, and the conductor resistance is more stable compared with a traditional winding wire structure with different structures; the conductor monofilaments are not conducted with each other, so that the electric performance of the conductor monofilaments is ensured, the whole winding is smaller in size, and the eddy current loss is reduced;
(2) The rectangular full-transposition wire with a larger area is formed by combining a plurality of groups of identical stranded bodies, so that the current carrying capacity is improved, the winding size is easy to control, the stranded bodies of each group are separated through an inner film, and the stranded bodies are not conducted, so that a small capacitance structure is formed, the resistance is ensured to be stable, and the eddy current loss is reduced;
(3) The flexible rubber filler can be made of a flexible rubber material which can be coated, so that the heat radiation capability can be improved, the shock resistance of the coil can be improved, the flexible rubber filler 14 can have better structural support when a polyester film or a polyimide film is wrapped, and the flexible rubber filler can be extruded when being wrapped, but does not cause a corner position to generate a vacancy so as to form a wrapping hollow structure;
(4) The insulating layer is made of a light environment-friendly insulating strip with excellent electrical performance, so that the minimum structural size is ensured while the passing of an AC8kV/1min withstand voltage test is ensured;
(5) The outer protective layer adopts an environment-friendly halogen-free strip with excellent adhesion with epoxy resin, so that the performance of the traditional process is ensured, the use of auxiliary materials of the reactor is greatly reduced, and the production cost and the volume of the reactor are reduced.
The utility model will be explained in detail below with reference to the drawings and specific embodiments.
Drawings
FIG. 1 is a schematic diagram of a cross-sectional structure of a square stranded wire according to the present utility model;
fig. 2 is an enlarged view of fig. 1 at a in accordance with the present utility model.
In the figure: 1. a conductor unit; 11. an outer membrane; 12. a conductor monomer; 121. a monofilament core; 122. a monofilament insulating film; 13. an inner membrane; 14. a flexible rubber filler; 2. an insulating layer; 3. and (3) a protective layer.
Detailed Description
In order that the utility model may be more fully understood, a more particular description of the utility model will be rendered by reference to the appended drawings, in which several embodiments of the utility model are illustrated, but which may be embodied in different forms and are not limited to the embodiments described herein, which are, on the contrary, provided to provide a more thorough and complete disclosure of the utility model.
Referring to fig. 1, the present utility model provides a technical solution: the film-covered square stranded wire for the high-current reactor winding comprises a stranded wire body, wherein the stranded wire body sequentially comprises a conductor unit 1, an insulating layer 2 and a protective layer 3 from inside to outside.
Referring to fig. 1 and 2, the conductor unit 1 includes at least two sets of stacked twisted bodies, an outer film 11 is sleeved outside the stacked twisted bodies, the twisted bodies are formed by arranging a plurality of conductor monomers 12 into two rows of twisted bodies, an inner film 13 is sleeved outside the twisted bodies, a flexible rubber filler 14 is arranged between the twisted conductor monomers 12 and the inner film 13, the outer film 11 and the inner film 13 are both made of polyester films or polyimide films, and the flexible rubber filler 14 is coated at the corner position of the twisted bodies.
Because a plurality of groups of identical stranded bodies are combined into a rectangular full-transposition wire with a larger area, the current carrying capacity is improved, the winding size is easy to control, and the stranded bodies of each group are separated through an inner film 13 and are not conducted, so that the stranded bodies form a small-capacitance structure; the flexible rubber filler 14 can be made of a flexible rubber material which can be coated, the heat dissipation capacity can be improved, the shock resistance of the coil can be improved, the flexible rubber filler 14 can have better structural support when a polyester film or a polyimide film is wrapped, and the flexible rubber filler 14 can be extruded when being wrapped, but does not cause the corner to be vacant, so that a wrapping hollow structure is formed.
Referring to fig. 1 and 2, each of the conductor units 12 is a monofilament core 121 formed by high-purity and high-resistivity round copper monofilaments, wherein the monofilament core 121 is made of monofilaments meeting the specification in GB/T3953, the elongation at break is greater than or equal to 38%, and the diameter of the monofilaments can be calculated according to the conductor resistance required by customers; and a layer of monofilament insulating film 122 is overlapped and wrapped outside the monofilament wire core 121, the wrapping coverage rate of the monofilament insulating film 122 is 52-56%, the wrapping angle is 30-60 ℃, and the wrapping technological effect is ensured. The monofilament core 121 is twisted and square after being wrapped by the monofilament insulating film 122 so as to be a long: the width ratio is 1:1-1: and 0.78, combining and merging the unit wire groups after square pressing to obtain a combined conductor, wherein the unit merging quantity can be pushed according to parameters such as the number of turns of a designed winding of the reactor, the design resistance requirement and the like. The special film wrapping tape is adopted for wrapping the conductor, so that insulation resistance can be ensured between the monofilament wire core 121 and the monofilament wire core 121 after stranding and profiling, a small capacitance structure is formed, the conductor monofilament is not conducted with the monofilament, and the overall winding size is smaller while the electrical performance is ensured.
Referring to fig. 1, the insulating layer 2 is formed by overlapping and wrapping a light environment-friendly insulating strip with high strength and excellent breakdown field strength, and the insulating layer 2 is at least provided with two layers, generally two layers of overlapping and wrapping, and the adjacent two layers are opposite in wrapping direction. The thickness of the strip material of each insulating layer 2 is not more than 0.025mm, the lapping covering rate is 52% -55%, the tensile strength of the insulating layer 2 is not less than 45N/cm, and the elongation is not less than 120, so that the insulating layer has good electrical insulation performance after being lapped, and the AC8kV/1min withstand voltage test is ensured to pass. Therefore, the structure size of the square winding wire can be reduced while the electrical performance is ensured, and the purpose of saving materials is achieved.
Referring to fig. 1, the protection layer 3 is formed by overlapping and wrapping a halogen-free strip with environmental protection and excellent adhesion with epoxy resin, and has excellent adhesion with the epoxy resin used by the reactor, so that the structural size of the winding wire is reduced while the internal protection of the square winding wire is simultaneously realized.
While the utility model has been described above with reference to the accompanying drawings, it will be apparent that the utility model is not limited to the embodiments described above, but is intended to be within the scope of the utility model, as long as such insubstantial modifications are made by the method concepts and technical solutions of the utility model, or the concepts and technical solutions of the utility model are applied directly to other occasions without any modifications.

Claims (5)

1. The utility model provides a membrane package pressure square stranded conductor that heavy current reactor winding was used, includes stranded conductor body, its characterized in that: the stranded wire body sequentially comprises a conductor unit (1), an insulating layer (2) and a protective layer (3) from inside to outside;
the conductor unit (1) comprises at least two groups of stacked stranded bodies, an outer film (11) is sleeved outside the stacked stranded bodies, the stranded bodies are formed by arranging a plurality of conductor monomers (12) into two rows of stranding, an inner film (13) is sleeved outside the stranded bodies, and a flexible rubber filler (14) is arranged between the stranded conductor monomers (12) and the inner film (13);
Each conductor unit (12) is formed into a monofilament wire core (121) by high-purity high-resistivity round copper monofilaments, and a monofilament insulating film (122) is wrapped outside the monofilament wire core (121) in a superposition mode.
2. The film-covered square stranded wire for a high-current reactor winding according to claim 1, wherein: the breaking elongation of the monofilament wire core (121) is more than or equal to 38%, the wrapping covering rate of the monofilament insulating film (122) is 52-56%, and the wrapping angle is 30-60 ℃.
3. The film-covered square stranded wire for a high-current reactor winding according to claim 1, wherein: the outer membrane (11) and the inner membrane (13) are both made of polyester films or polyimide films, and the flexible rubber filler (14) is coated at the corner position of the stranded body.
4. The film-covered square stranded wire for a high-current reactor winding according to claim 1, wherein: the insulating layer (2) is formed by overlapping and wrapping light environment-friendly insulating strips with high-strength breakdown field strength, the insulating layer (2) is at least provided with two layers, the adjacent two layers are opposite in wrapping direction, the thickness of each insulating layer (2) strip is not more than 0.025mm, wrapping covering rate is 52% -55%, the tensile strength of the insulating layer (2) is not less than 45N/cm, and the elongation is not less than 120%.
5. The film-covered square stranded wire for a high-current reactor winding according to claim 1, wherein: the protective layer (3) is formed by overlapping and wrapping halogen-free strips which are environment-friendly and excellent in adhesion with epoxy resin.
CN202322479040.6U 2023-09-13 2023-09-13 Film-covered square stranded wire for high-current reactor winding Active CN220873273U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202322479040.6U CN220873273U (en) 2023-09-13 2023-09-13 Film-covered square stranded wire for high-current reactor winding

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202322479040.6U CN220873273U (en) 2023-09-13 2023-09-13 Film-covered square stranded wire for high-current reactor winding

Publications (1)

Publication Number Publication Date
CN220873273U true CN220873273U (en) 2024-04-30

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ID=90813327

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202322479040.6U Active CN220873273U (en) 2023-09-13 2023-09-13 Film-covered square stranded wire for high-current reactor winding

Country Status (1)

Country Link
CN (1) CN220873273U (en)

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