CN217306286U - Dry-type transformer with voltage class of 72.5kV - Google Patents
Dry-type transformer with voltage class of 72.5kV Download PDFInfo
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- CN217306286U CN217306286U CN202220375452.8U CN202220375452U CN217306286U CN 217306286 U CN217306286 U CN 217306286U CN 202220375452 U CN202220375452 U CN 202220375452U CN 217306286 U CN217306286 U CN 217306286U
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Abstract
The utility model provides a voltage class is 72.5 kV's dry-type transformer (100), including high-voltage coil subassembly (40), it includes: a conductor layer including a plurality of conductors (41) distributed at intervals in an axial direction of the core, and an insulation layer disposed at one side of the conductor layer in a radial direction of the core and including a plurality of base insulation layers (42) disposed adjacent to each of the plurality of conductors and electrically insulating one side of the plurality of conductors in the radial direction; a plurality of reinforcing insulation layers (43) disposed apart from the base insulation layer and electrically insulating one sides of the plurality of conductors in a radial direction, an axial height of the reinforcing insulation layers being greater than an axial height of the base insulation layer; a support insulation layer (44) disposed distally from the plurality of reinforcing insulation layers and electrically insulating one side of the plurality of conductors in a radial direction; and an epoxy resin member (45) which forms an integrated structure with the conductor layer and the insulating layer. The utility model discloses a dry-type transformer can satisfy insulating requirement.
Description
Technical Field
The utility model relates to a transformer technical field especially relates to a voltage level is 72.5 kV's dry-type transformer.
Background
In an electric power system, a transformer is a core component of a power transformation section. Generally, a transformer can be classified into a dry type transformer and an oil immersed type transformer according to a cooling manner, wherein the dry type transformer is a transformer in which an iron core and a coil are not immersed in an insulating liquid, has the advantages of low consumption, high efficiency, flame retardance, explosion resistance, no pollution, no maintenance and the like, and is widely used in various industries.
The insulation system of the existing dry-type transformer usually adopts a combination of air insulation and solid insulation, and the insulation grade of the dry-type transformer product in the electric market is limited to a voltage grade of 35kV and below. When there is a demand for higher voltage class insulation, increasing the thickness of the air and solid insulation of a dry-type transformer is often a direct and efficient way to make the product meet the operational requirements, but this will increase the material cost, weight and loss parameters of the product. In addition, in some application scenarios, even the situation that the technical requirements are difficult to meet even with such a manner of increasing the insulation thickness may occur. Therefore, oil-filled transformers are generally also the choice for transformer products with voltage classes above 35 kV.
Therefore, there is a need for improvements in existing dry-type transformers to meet the operational demands of higher voltage classes and to provide more reliable options for the electricity market.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides a voltage class is 72.5 kV's dry-type transformer to satisfy the current insulation requirement to the transformer product that voltage class is 72.5kV, and optimize dry-type transformer's structural design.
Therefore, according to an aspect of the present invention, there is provided a dry-type transformer with a voltage class of 72.5kV, comprising: a core having an axial direction and a radial direction; a low voltage coil assembly coaxially disposed about the core; and a high voltage coil assembly coaxially disposed about the low voltage coil assembly; wherein the high voltage coil assembly comprises: a conductor layer and an insulating layer, the conductor layer including a plurality of conductors distributed at intervals along the axial direction, the insulating layer being disposed on one side of the conductor layer along the radial direction, wherein the insulating layer includes: a plurality of base insulating layers disposed adjacent to each of the plurality of conductors and electrically insulating one side of the plurality of conductors in the radial direction; a plurality of reinforcing insulation layers disposed away from each of the plurality of conductors with respect to the base insulation layer and electrically insulating one side of the plurality of conductors in the radial direction, wherein an axial height of the reinforcing insulation layers is greater than an axial height of the base insulation layer; and a supporting insulating layer disposed away from the plurality of conductors with respect to the plurality of reinforcing insulating layers and electrically insulating one side of the plurality of conductors in the radial direction; and the epoxy resin part, the conductor layer and the insulating layer form an integrated structure.
According to an embodiment of the present invention, the support insulating layer is a multilayer structure, and the multilayer structure includes a mechanical support layer.
According to an embodiment of the present invention, a part of the epoxy member is located between two adjacent layers in the multilayer structure.
According to the utility model discloses an embodiment, low voltage coil subassembly with be equipped with a plurality of insulating barrels between the high voltage coil subassembly, two adjacent insulating barrels among a plurality of insulating barrels separate certain clearance each other.
According to the utility model discloses an embodiment, dry-type transformer still includes leading-out terminal and pressure regulating branch end, the outside cladding that leading-out terminal and pressure regulating branch end has insulating protection piece.
According to an embodiment of the present invention, the dry-type transformer further includes an upper clamp and a lower clamp, the iron core, the low voltage coil assembly and the high voltage coil assembly are assembled between the upper clamp and the lower clamp, wherein the upper clamp and the lower clamp include rounded ends, and the upper clamp and the lower clamp include curved portions forming an arc shape.
According to an embodiment of the present invention, the dry-type transformer further includes an insulating barrier member, the insulating barrier member is located between the low-voltage coil assembly and the upper clamp and the lower clamp and between the high-voltage coil assembly and the upper clamp and the lower clamp.
According to the above technical scheme, because the utility model discloses a dry-type transformer's high-voltage coil subassembly can include the internal insulation design of multilayer insulating material combination, be equipped with many clearance distribution's insulation design between high-voltage coil subassembly and the low voltage coil subassembly, outside electrified structure adopts the mode of all insulation to insulate, the appearance of structure is designed into the form of border passivation, and low pressure, be equipped with insulating barrier member between high-voltage coil subassembly and the structure, consequently, can fully satisfy the insulating requirement of the dry-type transformer product of 72.5 kV's voltage class, thereby more reliable selections are provided for the electric power market. Additionally, the utility model discloses a dry-type transformer has fused advantages such as fire-retardant explosion-proof and non-maintaining of ordinary dry-type transformer, and has further optimized dry-type transformer's structural design.
Drawings
The above and other features and advantages of the present invention will become more apparent to those of ordinary skill in the art by describing in detail preferred embodiments thereof with reference to the attached drawings in which:
fig. 1 is a schematic cross-sectional view of a dry-type transformer with a voltage class of 72.5kV according to an embodiment of the present invention;
fig. 2 is a schematic partial cross-sectional view of a high voltage coil assembly of the dry type transformer shown in fig. 1;
fig. 3 is a partially enlarged view of the region a shown in fig. 1.
Wherein the reference numbers are as follows:
10 iron core
21 upper clamping piece
22 lower clamp
23 end of the tube
24 bending part
30 low voltage coil assembly
40 high-voltage coil assembly
41 conductor
42 base insulating layer
43 reinforced insulating layer
44 supporting insulation layer
45 epoxy resin part
50 insulating cylinder
61 outlet terminal and voltage-regulating tapping terminal
62 insulating protective member
100 dry type transformer
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention is further described in detail by embodiments below. It will be understood by those skilled in the art that these exemplary embodiments are not meant to form any limitation of the present invention. Furthermore, features in the embodiments of the present invention may be combined with each other without conflict. In the different figures, the same or similar components are denoted by the same reference numerals and the other components are omitted for the sake of brevity, but this does not indicate that the dry-type transformer of the present invention having a voltage class of 72.5kV may not include other components. It is to be understood that the sizes, proportions and numbers of elements in the drawings are not to be considered limiting of the invention.
A dry-type transformer with a voltage class of 72.5kV according to an embodiment of the present invention is described below with reference to fig. 1 to 3.
As shown in fig. 1, the dry-type transformer 100 of the present invention with a voltage class of 72.5kV includes an iron core 10, a low-voltage coil assembly 30, and a high-voltage coil assembly 40, wherein the iron core 10 has an axial direction X and a radial direction (not shown), the low-voltage coil assembly 30 is coaxially disposed around the iron core 10, and the high-voltage coil assembly 40 is coaxially disposed around the low-voltage coil assembly 30. Thus, a coaxial nested configuration is formed with the core 10 inside, the low voltage coil assembly 30 in the middle, and the high voltage coil assembly 40 outside. The iron core 10 may be made of silicon steel sheet, amorphous alloy strip material, etc., the low voltage coil assembly 30 may be made of prepreg insulation material, epoxy resin, copper (aluminum) foil (wire), etc., and the high voltage coil assembly 40 may be made of epoxy resin, copper (aluminum) foil (wire), insulation film, prepreg insulation material, etc., however, the present invention is not limited thereto, and any suitable material known in the art may be used to form the iron core 10, the low voltage coil assembly 30, and the high voltage coil assembly 40. It should be noted that, in the dry type transformer shown in fig. 1, the low voltage coil assembly 30 includes upper and lower two low voltage coils, and the high voltage coil assembly 40 includes upper and lower two high voltage coils, however, the present invention is not limited thereto, but may be applied to any type of dry type transformer.
As shown in fig. 2, the high voltage coil assembly 40 includes a conductor layer and an insulating layer, wherein the conductor layer includes a plurality of conductors 41 spaced apart in the axial direction X, and the insulating layer is disposed on one side of the conductor layer in the radial direction, wherein a plurality of base insulating layers 42 that electrically insulate one sides of the plurality of conductors 41 in the radial direction are disposed adjacent to each of the plurality of conductors 41, a plurality of reinforcing insulating layers 43 that electrically insulate one sides of the plurality of conductors 41 in the radial direction are disposed away from each of the plurality of conductors 41 with respect to the base insulating layers 42, and a support insulating layer 44 that electrically insulates one sides of the plurality of conductors 41 in the radial direction is disposed away from the plurality of conductors 41 with respect to the plurality of reinforcing insulating layers 43, wherein an axial height of the reinforcing insulating layers 43 is greater than an axial height of the base insulating layers 42. That is, the base insulating layer 42, the reinforcing insulating layer 43, and the conductors 41 are disposed in a one-to-one relationship, while the supporting insulating layer 44 and the conductors 41 are disposed in a one-to-many relationship. The base insulating layer 42 may serve the basic function of electrically insulating the conductor 41, for example by adhering to one side of the conductor 41 or a limited size of material disposed around the conductor 41, such as a coating on the outside of the conductor 41. The axial height of the reinforcing insulation layer 43 is greater than the axial height of the base insulation layer 42, and thus can serve to further enhance the electrical insulation of the conductor 41, while the base insulation layer 42 can maintain a small form factor, reducing the material cost, weight and loss parameters of the base insulation layer 42. The support insulating layer 44 may function to support the conductor 41, the base insulating layer 42, and the reinforcing insulating layer 43, and may also function to further enhance electrical insulation from the conductor 41. Hereinafter, the supporting insulating layer 44 will be described in more detail.
Although the conductor layer and the insulation layer in the high-voltage coil assembly 40 shown in fig. 2 seem to be separate components, the conductor layer and the insulation layer of the high-voltage coil assembly 30 are formed into an integrated structure by epoxy resin casting. Thus, the high voltage coil assembly 40 further includes an epoxy 45, wherein the epoxy, the conductor layer and the insulation layer form an integrated structure. For example, for the dry-type transformer shown in fig. 1, the high-voltage coil assembly 30 may be cast into two coils and then assembled on the upper and lower clamp members 21 and 22. In this way, the internal insulation system of the high voltage coil assembly 40 includes a plurality of insulation layers integrated with the epoxy resin member, so that it is possible to enhance the insulation performance and ensure that each insulation layer has sufficient mechanical properties and interlayer connection strength, thereby providing a better insulation effect to satisfy the insulation requirement of the voltage class of 72.5kV, while further reducing the cost, weight and loss parameters of the insulation material.
It should be noted that only one side of the conductor 41 of the high voltage coil assembly 40 (e.g., the side facing the low voltage coil assembly 30) is shown in fig. 2 as being provided with the respective insulating layers as described above, in which case when the conductor layer and the insulating layers are wound together into a coil, the insulating layers are uniformly provided on both sides of the conductor layer, and thus the internal insulation of the high voltage coil assembly 40 can be provided. However, the present invention is not limited to this, and the respective insulating layers as described above may be provided on opposite sides of the conductor 41, thereby further improving the insulating effect. It should be noted that the length and height of each insulation layer may be greater than the length and height, respectively, of the conductor 41, so that a more complete insulation may be provided to the conductors of the high voltage coil assembly 40 (particularly the innermost or outermost turn of the conductor) during winding.
As shown in fig. 2, the supporting insulation layer 44 may be a multi-layer structure (e.g., three layers are shown in fig. 2), wherein the multi-layer structure may include a mechanical support layer (not labeled), such as a fiberglass layer, to provide mechanical support while enhancing insulation. In addition, a portion of the epoxy resin member 45 is located between adjacent two layers in the multi-layered structure to connect the layers of the support insulating layer 44 together and may be formed integrally with other portions of the epoxy resin member 45, so that the insulating effect and the structural strength may be further improved.
According to an embodiment of the present invention, the base insulating layer 42 and the reinforcing insulating layer 43 may be made of any one selected from the group consisting of Polyethylene terephthalate (PET for short), polyester film, polyester fiber non-woven fabric, soft composite foil (Dacron Mylar Dacron for short, DMD), glass fiber prepreg, and epoxy resin. The supporting insulating layer 44 may be made of any one or more selected from the group consisting of PET, DMD, glass fiber prepreg, and epoxy resin. The base insulating layer 42, the reinforcing insulating layer 43, and the support insulating layer 44 may be made of the same or different materials according to the insulation grade, the production process, and the like. Preferably, the base insulating layer 42, the reinforcing insulating layer 43, and the supporting insulating layer 44 may be made of different materials. In this case, by using a plurality of insulating materials, the characteristics of each insulating material can be fully utilized to further enhance the insulating properties in an optimally combined manner.
With continued reference to fig. 1, according to an embodiment of the present invention, in order to further improve the insulation effect between the low voltage coil assembly 30 and the high voltage coil assembly 40, a plurality of insulation cylinders 50 may be disposed between the low voltage coil assembly 20 and the high voltage coil assembly 30, and two adjacent insulation cylinders of the plurality of insulation cylinders 50 are spaced apart from each other by a certain gap. The insulating cylinder 50 may be made of any one selected from the group consisting of PET, DMD, glass fiber prepreg, and epoxy resin. This provides a distribution of multiple gap insulation between the low voltage coil assembly 30 and the high voltage coil assembly 40, which further improves the breakdown strength of the air or insulation layer.
It should be noted that the base insulating layer 42, the reinforcing insulating layer 43, the supporting insulating layer 44, and the insulating cylinder 50 are not limited to being made of the above-described materials, but may be made of any suitable materials known in the art.
As shown in fig. 1, the dry-type transformer 100 further includes a line outlet terminal and a voltage regulating tap terminal 61, for example, a line outlet terminal and a voltage regulating tap terminal of the high-voltage coil assembly 40. The existing outlet and voltage regulation terminals 61 are typically exposed and may experience air breakdown. The utility model discloses a leading-out terminal and the pressure regulating of high-voltage coil assembly 40 divide the outside of end 61 to have the cladding to have insulating protection 62, can further improve insulating effect, reduce the air insulation distance. It should be noted that the present invention is not limited to providing insulation protection outside of the outlet and voltage regulation terminals of the high voltage coil assembly 40, but rather, the insulation protection 62 may be provided on any live structure of the dry-type transformer 100.
In addition, fig. 1 also shows that the dry-type transformer 100 further includes an upper clamping member 21 and a lower clamping member 22, and the iron core 10, the low voltage coil assembly 30 and the high voltage coil assembly 40 are assembled between the upper clamping member 21 and the lower clamping member 22, for example, by spacers. The upper and lower clips 21 and 22 serve as structural members of the dry-type transformer 100, and may also generate an electric field during operation of the dry-type transformer. In a conventional structural member, since an end portion and a bent portion of the structural member are generally formed in a substantially pointed shape, a phenomenon in which a current is concentrated to generate a point discharge is easily caused. According to an embodiment of the present invention, the upper clip member 21 and the lower clip member 22 include rounded end portions 23, and the upper clip member 21 and the lower clip member 22 include curved portions 24 forming an arc shape. Therefore, the edge of the structural member can be passivated and has a streamline design, the distribution of electric fields can be optimized, and the current concentration degree and the risk of breakdown are reduced.
To further improve the insulation effect, the dry-type transformer 100 further includes insulation barriers (not shown in fig. 1), such as insulation pads or insulation rubber, between the low-voltage coil assembly 20 and the upper and lower clamping pieces 21 and 22 and between the high-voltage coil assembly 30 and the upper and lower clamping pieces 21 and 22
Compared with the existing dry-type transformer, the utility model discloses a high-voltage coil assembly 40 can include the internal insulation design of multilayer insulating material combination, the insulation design of the many clearance distributions between high-voltage coil assembly 40 and the low voltage coil assembly 30, the all insulation design of outside electrified structure, the passivation design of structure appearance and the insulation between coil assembly and the structure separate the fender design, consequently can satisfy the insulation requirement to the dry-type transformer product of 72.5 kV's voltage class, more reliable selections are provided for the electric power market, and dry-type transformer's structural design has been optimized.
To sum up, the utility model provides a voltage class is 72.5 kV's dry-type transformer 100, including high-voltage coil subassembly 40, it includes: a conductor layer including a plurality of conductors 41 spaced apart in an axial direction of the core, and an insulating layer disposed at one side of the conductor layer in a radial direction of the core, and including a plurality of base insulating layers 42 disposed adjacent to each of the plurality of conductors and electrically insulating one side of the plurality of conductors in the radial direction; a plurality of reinforcing insulating layers 43 disposed apart from the base insulating layer and electrically insulating one side of the plurality of conductors in a radial direction, an axial height of the reinforcing insulating layers being greater than an axial height of the base insulating layer; a support insulating layer 44 disposed apart from the plurality of reinforcing insulating layers and electrically insulating one side of the plurality of conductors in a radial direction; and an epoxy resin member 45 which forms an integrated structure with the conductor layer and the insulating layer. The utility model discloses a voltage class is 72.5 kV's dry-type transformer can satisfy insulating requirement.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. Dry-type transformer (100) with a voltage class of 72.5kV, comprising:
a core (10), the core (10) having an axial direction (X) and a radial direction;
a low voltage coil assembly (30), the low voltage coil assembly (30) being coaxially disposed about the core (10); and
a high voltage coil assembly (40), the high voltage coil assembly (40) being coaxially disposed about the low voltage coil assembly (30);
characterized in that the high voltage coil assembly (40) comprises a conductor layer comprising a plurality of conductors (41) distributed at intervals in the axial direction (X) and an insulation layer provided at one side of the conductor layer in the radial direction, wherein the insulation layer comprises:
a plurality of base insulating layers (42) provided near each of the plurality of conductors (41) and electrically insulating one side of the plurality of conductors (41) in the radial direction;
a plurality of reinforcing insulating layers (43) disposed away from each of the plurality of conductors (41) with respect to the base insulating layer (42) and electrically insulating one side of the plurality of conductors (41) in the radial direction, wherein an axial height of the reinforcing insulating layers (43) is greater than an axial height of the base insulating layer (42); and
a support insulating layer (44) that is disposed away from the plurality of conductors (41) with respect to the plurality of reinforcing insulating layers (43) and electrically insulates one side of the plurality of conductors (41) in the radial direction;
wherein the high voltage coil assembly (40) further comprises an epoxy (45), the epoxy, the conductor layer and the insulating layer forming an integrated structure.
2. Dry transformer (100) with a voltage class of 72.5kV according to claim 1, characterized by the fact that the supporting insulation layer (44) is a multilayer structure comprising mechanical support layers.
3. A dry-type transformer (100) with a voltage class of 72.5kV according to claim 2, characterized in that a portion of the epoxy resin (45) is located between two adjacent layers in the multilayer structure.
4. Dry transformer (100) with a voltage class of 72.5kV according to claim 1, characterized in that a plurality of insulation cylinders (50) are arranged between the low voltage coil assembly (30) and the high voltage coil assembly (40), adjacent two insulation cylinders of the plurality of insulation cylinders (50) being spaced apart from each other by a gap.
5. Dry transformer (100) with a voltage class of 72.5kV according to claim 1, characterized in that the dry transformer (100) further comprises an outlet terminal and a voltage regulating tapping terminal (61), and the outlet terminal and the voltage regulating tapping terminal (61) are externally covered with an insulating protection (62).
6. Dry transformer (100) with a voltage class of 72.5kV according to claim 1, characterized in that the dry transformer (100) further comprises an upper clamp (21) and a lower clamp (22), the core (10), the low voltage coil assembly (30) and the high voltage coil assembly (40) being assembled between the upper clamp (21) and the lower clamp (22), wherein the upper clamp (21) and the lower clamp (22) comprise rounded ends (23) and the upper clamp (21) and the lower clamp (22) comprise bends (24) forming an arc shape.
7. Dry transformer (100) with a voltage class of 72.5kV according to claim 6, characterized in that the dry transformer (100) further comprises insulating barriers between the low voltage coil assembly (30) and the upper and lower clamp pieces (21, 22) and between the high voltage coil assembly (40) and the upper and lower clamp pieces (21, 22).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220375452.8U CN217306286U (en) | 2022-02-23 | 2022-02-23 | Dry-type transformer with voltage class of 72.5kV |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220375452.8U CN217306286U (en) | 2022-02-23 | 2022-02-23 | Dry-type transformer with voltage class of 72.5kV |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217306286U true CN217306286U (en) | 2022-08-26 |
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ID=82928701
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220375452.8U Active CN217306286U (en) | 2022-02-23 | 2022-02-23 | Dry-type transformer with voltage class of 72.5kV |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217306286U (en) |
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2022
- 2022-02-23 CN CN202220375452.8U patent/CN217306286U/en active Active
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Address after: 510000 No. 26, Jungong Road, East District, Guangzhou Economic and Technological Development Zone, Guangdong Province Patentee after: Guangzhou Siemens Energy Transformer Co.,Ltd. Address before: 510000 No. 26, Jungong Road, East District, Guangzhou Economic and Technological Development Zone, Guangdong Province Patentee before: SIEMENS TRANSFORMER (GUANGZHOU) Co.,Ltd. |