CN116525266A - Encapsulated transformer coil with effective filling rate and heat dissipation - Google Patents
Encapsulated transformer coil with effective filling rate and heat dissipation Download PDFInfo
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- CN116525266A CN116525266A CN202310717036.0A CN202310717036A CN116525266A CN 116525266 A CN116525266 A CN 116525266A CN 202310717036 A CN202310717036 A CN 202310717036A CN 116525266 A CN116525266 A CN 116525266A
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- 230000017525 heat dissipation Effects 0.000 title claims abstract description 28
- 235000012771 pancakes Nutrition 0.000 claims abstract description 37
- 230000005684 electric field Effects 0.000 claims abstract description 12
- 238000004804 winding Methods 0.000 claims description 17
- 239000011810 insulating material Substances 0.000 claims description 6
- 238000005266 casting Methods 0.000 claims description 3
- 239000004593 Epoxy Substances 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 14
- 238000004458 analytical method Methods 0.000 abstract description 2
- 239000000835 fiber Substances 0.000 abstract description 2
- 238000009434 installation Methods 0.000 abstract description 2
- 239000012774 insulation material Substances 0.000 abstract description 2
- 229920005989 resin Polymers 0.000 abstract description 2
- 239000011347 resin Substances 0.000 abstract description 2
- 239000000126 substance Substances 0.000 abstract description 2
- 238000012795 verification Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 4
- 239000011888 foil Substances 0.000 description 3
- 238000007405 data analysis Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 239000003822 epoxy resin Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229920000647 polyepoxide Polymers 0.000 description 2
- 239000011149 active material Substances 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/2876—Cooling
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
- H01F27/306—Fastening or mounting coils or windings on core, casing or other support
Abstract
The invention relates to the technical field of transformer coils, in particular to an encapsulated transformer coil with effective filling rate and heat dissipation, which comprises a plurality of groups of coil units, wherein each group of coil units comprises a segment of pancake coil group and two segments of layer coil groups; in each group of coil units, the pancake coil group and the layered coil group form magnetic potential series connection; except for an input end and an output end, the coil units of adjacent groups are connected in series according to the principle of magnetic potential. The electric field strength of the coil unit junctions must meet the permissible electric field strength requirements (e.g., resin, chemical fibers, and air) of the insulation material thereat. The structure of the coil fully plays the advantage of high volume effective filling rate of the pancake coil, and simultaneously facilitates the installation of an air passage to solve the outstanding contradiction of the heat dissipation problem of the encapsulated large-medium-sized transformer. Through verification, comparison and analysis, the volume effective material filling rate of the invention is higher than that of the coil structure with the traditional structure by 5%, and the volume effective filling rate of the transformer with the air passage heat dissipation is improved.
Description
Technical Field
The invention relates to the technical field of transformer coils, in particular to an encapsulated transformer coil with effective filling rate and heat dissipation.
Background
Transformers are the main equipment for power transmission and are particularly important in national economy. The cast transformer is called dry transformer for short, the technical term is called encapsulated transformer for short, and the cast transformer occupies 30% of the transformer products. The loss and the manufacturing cost of the transformer are reduced, and the transformer has practical significance for energy conservation, consumption reduction and sustainable development society.
In encapsulated transformers, the high voltage coil is a necessary and important structure for such transformers, generally a hollow cylinder structure. As can be seen from the sectional view taken along the radius thereof, the conventional coil sectional view is generally a narrow foil wound structure, a flat wire full pancake structure, a full layer structure or a flat wire full layer type band air passage structure.
The effective material filling rate of the transformer coil is an important index directly related to the total cost of the transformer, hereinafter referred to as effective filling rate. Simply speaking, the higher the effective fill rate, the lower the cost, and vice versa. The effective fill rate concept is the percentage of magnetically conductive and electrically conductive materials of the transformer in relative space. In the above-mentioned conventional structure, the volume effective material filling rate of the flat wire full cake type structure is highest and can reach 95%, which is the highest volume effective filling rate in all coil structure types, but the defect is that it is inconvenient to add the air passage for heat dissipation. The volume effective filling rate of both the narrow foil structure and the full layer structure is very low, on average only 85%. However, the flat wire full-layer type air passage structure is the only traditional coil structure with an air passage (for increasing heat dissipation purposes), namely the only structure with good heat dissipation effect of the high-voltage coil of the traditional encapsulated large and medium-sized transformer, and the disadvantage is quite obvious, namely the effective filling rate is low.
Disclosure of Invention
The invention aims to solve the technical problem that the effective filling rate of the high-voltage coil of the traditional encapsulated large-medium-sized transformer is low.
The invention provides an encapsulated transformer coil with effective filling rate and heat dissipation for solving the technical problems, which comprises a plurality of groups of coil units, wherein each coil unit comprises a segment of pancake coil group and two segments of layer type coil groups;
in a group of coil units, the pancake coil group is connected with the layered coil group to form a magnetic potential series connection;
the input end and the output end are separated, and the adjacent coil units are connected according to the principle of magnetic potential series connection;
and the electric field strength of the connection part of the coil units meets the allowable electric field strength requirement of the insulating material of the connection part.
Preferably, the coil units of each group have equal thickness, are arranged in a height order, and are finally connected in series to form the winding of the transformer.
Preferably, the pancake coil assembly and the layered coil assembly within the coil unit are separated by an air channel; specifically, when in winding, all the turns of the pancake coil assembly are wound, an air passage mould strip is paved, and then the bonding wire is connected with a winding layer type coil, namely an inner pancake outer layer type coil.
Preferably, the pancake coil assembly and the layered coil assembly within the coil unit are separated by an air channel; specifically, when in winding, all layered turns are wound, an air passage mould strip is paved, and then the bonding wire is connected with a winding pancake coil, namely an inner-layer outer pancake coil.
Preferably, the coils of the coil units are from the current inlet to the current outlet, the sections of the wires are equal, and the turns are connected according to the principle of magnetic potential series superposition.
Preferably, the electric field intensity at the connection of each coil unit meets the requirement of permissible field intensity of the insulating material at the connection, so as to meet the requirement of overvoltage bearing of the transformer winding and the requirement of low partial discharge capacity.
Preferably, the coil units are all arranged in a core frame of the transformer, and the coil units are in the shape of a cylinder, an elliptical cylinder or a long cylinder.
Preferably, the coil units are all molded by casting epoxy resin.
The beneficial effects are that: the invention provides an encapsulated transformer coil with effective filling rate and heat dissipation, which comprises a plurality of groups of coil units, wherein each group of coil units comprises a cake-type coil group and two sections of layer-type coil groups; in each group of coil units, the pancake coil group and the layered coil group form magnetic potential series connection; except for an input end and an output end, the coil units of adjacent groups are connected in series according to the principle of magnetic potential. The electric field strength of the coil unit junctions must meet the permissible electric field strength requirements (e.g., resin, chemical fibers, and air) of the insulation material thereat. The structure of the coil fully plays the advantage of high volume effective filling rate of the pancake coil, and simultaneously facilitates the installation of an air passage to solve the outstanding contradiction of the heat dissipation problem of the encapsulated large-medium-sized transformer. Through verification, comparison and analysis, the volume effective material filling rate of the invention is higher than that of the coil structure with the traditional structure by 5%, and the volume effective filling rate of the transformer with the air passage heat dissipation is improved. This means that the volume of the transformer coil of the present invention can be reduced by 5% over the conventional coil structure. Has great breakthrough significance and popularization value.
In addition, as the pancake coil group is adopted, compared with the traditional narrow foil winding structure, the welding point is omitted, the process complexity is reduced, the cost is reduced, and the manufacturing period is shortened.
The foregoing description is only an overview of the present invention, and is intended to provide a better understanding of the present invention, as it is embodied in the following description, with reference to the preferred embodiments of the present invention and the accompanying drawings. Specific embodiments of the present invention are given in detail by the following examples and the accompanying drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiments of the invention and together with the description serve to explain the invention and do not constitute a limitation on the invention. In the drawings:
FIG. 1 is a schematic diagram of an encapsulated transformer coil with both volume effective fill and heat dissipation in accordance with the present invention;
FIG. 2 is a schematic diagram of the ampere-turn density of FIG. 1;
FIG. 3 is a schematic diagram of another structure of an encapsulated transformer coil with both volume effective fill and heat dissipation according to the present invention;
fig. 4 is a schematic diagram of the ampere-turn density of fig. 3.
Detailed Description
The principles and features of the present invention are described below with reference to the drawings, the examples are illustrated for the purpose of illustrating the invention and are not to be construed as limiting the scope of the invention. The invention is more particularly described by way of example in the following paragraphs with reference to the drawings. Advantages and features of the invention will become more apparent from the following description and from the claims. It should be noted that the drawings are in a very simplified form and are all to a non-precise scale, merely for convenience and clarity in aiding in the description of embodiments of the invention.
It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When a component is considered to be "connected" to another component, it can be directly connected to the other component or intervening components may also be present. When an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all groups of one or more of the associated listed items.
The embodiment of the invention provides an encapsulated transformer coil with effective filling rate and heat dissipation, which comprises a plurality of groups of coil units, wherein each coil unit comprises a cake-type coil group and a two-section layer-type coil group; in a group of coil units, the pancake coil group is connected with the layered coil group to form a magnetic potential series connection; the input end and the output end are separated, and the adjacent coil units are connected according to the principle of magnetic potential series connection; and the electric field strength of the connection part of the coil units meets the allowable electric field strength requirement of the insulating material of the connection part. The coil units of each group have equal thickness, are arranged in a height sequence, and are finally connected in series to form a winding of the transformer. The coils of the coil units are from the current inlet to the current outlet, the sections of the wires are equal, and the turns are connected according to the principle of magnetic potential series superposition. The electric field intensity at the connection part of each coil unit meets the requirement of permissible field intensity of insulating materials at the connection part so as to meet the requirement of overvoltage bearing of a transformer winding and the requirement of low partial discharge capacity.
In a preferred embodiment, the coil units are all arranged in a core frame of the transformer, and the coil units are in the shape of a cylinder, an elliptical cylinder or a long cylinder. The coil units are all formed by casting epoxy resin.
The following description will be made specifically in terms of two structural forms of the coil unit:
the structure form of the inner cake outer layer coil is as follows:
referring to fig. 1 and 2, the coil unit according to the embodiment of the present invention has a structure of an inner pancake coil and an outer layer coil group, that is, an inner pancake outer layer coil: the pancake coil assembly and the layered coil assembly within the coil unit are separated by an air channel; specifically, when in winding, all the turns of the pancake coil assembly are wound, an air passage mould strip is paved, and then the bonding wires are connected with the winding layer type coil. It can be seen that the density of the active material in the axial direction of the coil (i.e., ampere-turn density ζ) remains constant at 90% in the radial direction at the 1/2-wise inner pancake portion, but the axial density in the 1/2-wise outer pancake portion is changed in a diagonal manner, i.e., ζ (x) = -0.2x+0.85, so that the volume effective filling rate of the inner pancake outer layer coil is:
k＝2πH∫0F(R+x)ζ(x)dx/(2πH∫0F(R+x)dx)
＝∫0F(R+x)ζ(x)dx/(∫0F(R+x)dx)
＝【90％∫0F/2(R+x)dx+∫F/2F(R+x)(-0.2x+0.85)dx】/(∫0F(R+x)dx)
＝【90％∫0F/2(R+x)dx+∫F/2F(0.85R-0.2Rx+0.85x-0.2x2)dx】/(∫0F(R+x)dx)
＝{[90％
(Rx+x2/2)]0F/2+[0.85Rx-0.1Rx2+0.425x2-0.2x3/3]F/2F}/[(Rx+x2/2)]0F
＝{(0.45RF+0.1125F2)+(0.425RF-0.075RF2+0.31875F2-0.0583F3)/(RF+F2/2)
＝(0.875RF+0.43125F2-0.075RF2-0.0583F3)/(RF+F2/2)
wherein R is the inner radius of the coil, which is constant for the specific product; h is the effective height of the coil, which is constant for the particular product; f is the total radial dimension of the coil, namely the thickness, which is constant for a specific product and can be equal to 1; x is any distance from the radial direction of the coil web to the inner radius, is an independent variable of a function, and has a value range of 0 to F; zeta (x) -the effective material density at the web direction x is a dependent variable that varies with x; k-the effective filling rate of a certain structural volume, i.e. the ratio of the effective material volume to the actual space volume of the coil.
Let f=1, r=8 (R is typically 6 to 10 times F) bring into the above formula to k=79.7%.
From data analysis, the coil structure of the embodiment has the advantage of heat dissipation, and compared with the traditional full-layer coil with air passage heat dissipation and the structure with the air passage, the volume effective filling rate of the coil structure is 74% greater than that of the traditional structure.
The full pancake coil group wound by the traditional flat wire can be known that the density of the effective material along the axial direction of the coil is uniformly maintained to be more than 93 percent from inside to outside, so that the volume effective filling rate of the full pancake coil is as follows:
k＝2π∫0F(R+x)Hζ(x)dx/(2π∫0F(R+x)Hdx)
＝ζ(x)＝93％
the coil has the highest volume effective filling rate in all coil structure types, and has the defect of inconvenient addition of air passage for heat dissipation. Wherein R is the inner radius of the coil, which is constant for the specific product; h is the effective height of the coil, which is constant for the particular product; f is the total radial dimension of the coil, namely the thickness, which is constant for a specific product and can be equal to 1; x is any distance from the radial direction of the coil web to the inner radius, is an independent variable of a function, and has a value range of 0 to F; zeta (x) -the effective material density at the radial direction x is a dependent variable that varies with x, in this case 93%; k-the effective filling rate of a certain structural volume, i.e. the ratio of the effective material volume to the actual space volume of the coil. In this example, ζ (x) is a constant and can be mentioned as an integral, so the fixed integral of k molecules and denominators can be directly divided to obtain k=93%.
As can be known from the conventional wire-wound full-layer coil assembly, the density of the effective material along the axial direction of the coil is continuously changed from inside to outside in a slanting manner, namely ζ (x) = -0.2x+0.85, so that the volume effective filling rate of the full-layer coil is as follows:
k＝2πH∫0F(R+x)ζ(x)dx/(2πH∫0F(R+x)dx)
＝∫0F(R+x)ζ(x)dx/(∫0F(R+x)dx)
＝∫0F(0.85R-0.2x2-0.2Rx+0.85x)dx/(∫0F(R+x)dx)
＝[0.85Rx-0.1x3-0.1Rx2+0.425x2]0F/[Rx+0.5x2]0F
＝[0.85RF-0.1F3-0.1RF2+0.425F2]/[RF+0.5F2]
let f=1 and typically r=6 to 10 times F bring the above formula k≡74% closer to 75% with larger R/F values. The number of each generation in the formula is the same as that in the formula (1). As can be seen from the conventional wound full-layer coil and the structure with the air passage, the volume effective material filling rate is identical to that of the conventional wound full-layer coil set under the condition that the influence factor of the air passage on the volume filling rate is ignored, and k is approximately 74%.
The structure form of the inner layer cake-type coil is as follows:
referring to fig. 3 and 4, the coil unit structure of the embodiment of the present invention is a wire-wound inner layer coil+outer pancake coil group, i.e., an inner layer outer pancake coil: the pancake coil assembly and the layered coil assembly within the coil unit are separated by an air channel; specifically, all layered turns are wound, an air passage mould strip is paved, and then a cake-type coil is wound by wire bonding.
It can be seen that the inner part of the effective material density is a full layer coil assembly, and the outer part in the 1/2 width direction is the effective material density which changes along the inclined line, namely zeta (x) = -0.2x+0.85, but the outer part in the 1/2 width direction is 80% unchanged. The volume effective filling rate of the inner layer type outer pancake coil of the embodiment is:
k＝2πH∫0F(R+x)ζ(x)dx/(2πH∫0F(R+x)dx)
＝∫0F(R+x)ζ(x)dx/(∫0F(R+x)dx)
＝【80％∫F/2F(R+x)dx+∫0F/2(R+x)(-0.2x+0.85)dx】/(∫0F(R+x)dx)
＝【80％∫F/2F(R+x)dx+∫0F/2(0.85R-0.2Rx+0.85x-0.2x2)dx】/(∫0F(R+x)dx)
＝{[80％
(Rx+x2/2)]F/2F+[0.85Rx-0.1Rx2+0.425x2-0.2x3/3]0F/2}/[(Rx+x2/2)]0F
＝{(0.4RF+0.3F2)+(0.425RF-0.025RF2+0.10625F2-0.00833F3)}/(RF+F2/2)
＝(0.825RF+0.40635F2-0.025RF2-0.0083F3)/(RF+F2/2)
let f=1, r=8 (R is typically 6 to 10 times F) bring into the above formula to k=80%.
From data analysis, the volume effective filling rate of the coil structure is larger than that of the traditional structure.
Comprehensively analyzing the coil structures of the two encapsulated transformers of the invention shown in fig. 2 and 4, the volume effective material filling rate is higher than that of the coil structure with the traditional structure by 5%, and the volume effective filling rate of the transformer with the air passage heat dissipation is improved. This means that the volume of the transformer coil of the present invention can be reduced by 5% over the conventional coil structure. Has great breakthrough significance and popularization value.
The above description is only of the preferred embodiments of the present invention, and is not intended to limit the present invention in any way; those skilled in the art will readily appreciate that the present invention may be implemented as shown in the drawings and described above; however, those skilled in the art will appreciate that many modifications, adaptations, and variations of the present invention are possible in light of the above teachings without departing from the scope of the invention; meanwhile, any equivalent changes, modifications and evolution of the above embodiments according to the essential technology of the present invention still fall within the scope of the present invention.
Claims (8)
1. The encapsulated transformer coil with effective filling rate and heat dissipation comprises a plurality of groups of coil units, and is characterized in that the coil units comprise a segment of pancake coil group and two segments of layer coil groups;
in a group of coil units, the pancake coil group is connected with the layered coil group to form a magnetic potential series connection;
the input end and the output end are separated, and the adjacent coil units are connected according to the principle of magnetic potential series connection;
and the electric field strength of the connection part of the coil units meets the allowable electric field strength requirement of the insulating material of the connection part.
2. The encapsulated transformer coil with both effective fill and heat dissipation as recited in claim 1 wherein each set of said coil units are of equal thickness and are arranged in a height order and are finally serially connected to form a winding of the transformer as a whole.
3. The encapsulated transformer coil with both effective fill and heat dissipation as recited in claim 1 wherein pancake coil assembly and layered coil assembly within the coil unit are separated by an air channel; specifically, when in winding, all the turns of the pancake coil assembly are wound, an air passage mould strip is paved, and then the bonding wire is connected with a winding layer type coil, namely an inner pancake outer layer type coil.
4. The encapsulated transformer coil with both effective fill and heat dissipation as recited in claim 1 wherein pancake coil assembly and layered coil assembly within the coil unit are separated by an air channel; specifically, when in winding, all layered turns are wound, an air passage mould strip is paved, and then the bonding wire is connected with a winding pancake coil, namely an inner-layer outer pancake coil.
5. The encapsulated transformer coil with effective fill factor and heat dissipation as recited in claim 1 wherein the coils of the coil units are equal in wire cross section from current inlet to current outlet and the turns are connected in a magnetic potential series stack.
6. The encapsulated transformer coil with both effective fill and heat dissipation as recited in claim 1, wherein the junction field strength of each of said coil units meets the allowable field strength requirement of the insulating material at the junction to meet the overvoltage-bearing requirement and the low partial discharge requirement of the transformer winding.
7. The encapsulated transformer coil with both effective fill and heat dissipation as recited in claim 1 wherein the coil units are disposed within a core frame of the transformer and are shaped as cylinders, elliptical cylinders or oblong cylinders.
8. The encapsulated transformer coil with both effective fill and heat dissipation as recited in claim 1, wherein the coil units are all molded by epoxy casting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310717036.0A CN116525266A (en) | 2023-06-15 | 2023-06-15 | Encapsulated transformer coil with effective filling rate and heat dissipation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310717036.0A CN116525266A (en) | 2023-06-15 | 2023-06-15 | Encapsulated transformer coil with effective filling rate and heat dissipation |
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| CN116525266A true CN116525266A (en) | 2023-08-01 |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB882867A (en) * | 1958-12-05 | 1961-11-22 | Ferranti Ltd | Improvements relating to inductive windings |
| KR20040104987A (en) * | 2003-06-03 | 2004-12-14 | 대한민국 (경상대학교 총장) | Main insulation structure of 22.9kV class high temperature transformer assembled double-pancake coil |
| CN201038981Y (en) * | 2007-05-18 | 2008-03-19 | 冯春国 | Stator coil structure of cylinder drive oil line motor |
| WO2017118472A1 (en) * | 2016-01-04 | 2017-07-13 | Abb Schweiz Ag | Multilayer winding transformer |
| CN206758251U (en) * | 2017-06-02 | 2017-12-15 | 济南西门子变压器有限公司 | Power transformer |
| US20180321343A1 (en) * | 2017-05-05 | 2018-11-08 | Bruker Biospin Ag | Superconductive magnet coil assembly comprising a plurality of layer-wound strip-like superconductors |
| CN208954769U (en) * | 2018-12-03 | 2019-06-07 | 新昇电气有限公司 | A kind of high-voltage coil structure of dry-type transformer |
| CN114496519A (en) * | 2021-12-29 | 2022-05-13 | 上海置信电气有限公司 | Elastic insulator fully-encapsulated dry-type transformer winding structure and manufacturing method thereof |
-
2023
- 2023-06-15 CN CN202310717036.0A patent/CN116525266A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB882867A (en) * | 1958-12-05 | 1961-11-22 | Ferranti Ltd | Improvements relating to inductive windings |
| KR20040104987A (en) * | 2003-06-03 | 2004-12-14 | 대한민국 (경상대학교 총장) | Main insulation structure of 22.9kV class high temperature transformer assembled double-pancake coil |
| CN201038981Y (en) * | 2007-05-18 | 2008-03-19 | 冯春国 | Stator coil structure of cylinder drive oil line motor |
| WO2017118472A1 (en) * | 2016-01-04 | 2017-07-13 | Abb Schweiz Ag | Multilayer winding transformer |
| US20180321343A1 (en) * | 2017-05-05 | 2018-11-08 | Bruker Biospin Ag | Superconductive magnet coil assembly comprising a plurality of layer-wound strip-like superconductors |
| CN206758251U (en) * | 2017-06-02 | 2017-12-15 | 济南西门子变压器有限公司 | Power transformer |
| CN208954769U (en) * | 2018-12-03 | 2019-06-07 | 新昇电气有限公司 | A kind of high-voltage coil structure of dry-type transformer |
| CN114496519A (en) * | 2021-12-29 | 2022-05-13 | 上海置信电气有限公司 | Elastic insulator fully-encapsulated dry-type transformer winding structure and manufacturing method thereof |
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