CN218782893U - Grading ring, solid insulation transformer and electric field shielding structure thereof - Google Patents
Grading ring, solid insulation transformer and electric field shielding structure thereof Download PDFInfo
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- CN218782893U CN218782893U CN202221865686.7U CN202221865686U CN218782893U CN 218782893 U CN218782893 U CN 218782893U CN 202221865686 U CN202221865686 U CN 202221865686U CN 218782893 U CN218782893 U CN 218782893U
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Abstract
The utility model discloses an equalizing ring for solid insulation transformer, including the main part, the main part twists into hollow spring form to the main part end to end encloses into the closed loop. The main part twists into hollow spring form in the above-mentioned equalizer ring, has characteristics small, that the surface area is big, compares in prior art equalizer ring that the cylinder main part constitutes, can be when pouring as an organic whole with solid insulation spare fully contact, prevent among the solid insulation spare with the stress of equalizer ring contact department too big, avoid producing the fracture with equalizer ring contact position department in the solid insulation spare, ensure that the insulating properties of solid insulation spare avoids influencing. The utility model discloses still openly use the electric field shielding structure and the solid insulation transformer of above-mentioned equalizer ring respectively, make solid insulation spare avoid the fracture, guarantee solid insulation spare's good insulating properties.
Description
Technical Field
The utility model relates to a transformer technical field, more specifically say, relate to an equalizer ring, a solid insulation transformer's electric field shielding structure, still relate to a solid insulation transformer.
Background
In the solid insulation transformer applied in the medium-high voltage scene, the high and low voltage sides have larger potential gradient difference, and through reasonable main insulation and electric field shielding design, voltage stress can be uniformly distributed on the solid insulation part as far as possible, so that the electric field strength is lower than the initial discharge value. However, for the potential cut-off (e.g. potential 2 in fig. 1), the size is limited and the end surface is not flat, and when the distance from the potential cut-off to another potential (i.e. potential 1 in fig. 1) is short, a tip potential is easily formed, which causes distortion of a local electric field, and further causes local discharge, and long-term discharge may destroy the insulating property of the solid insulating member, thereby affecting the service life and quality of the transformer product.
In the prior art, an electric field distribution is improved by arranging a grading ring at a point potential, wherein the grading ring is a circular ring formed by surrounding cylindrical raw materials; the expansion coefficients of the grading ring and the solid insulating part are different, the grading ring and the solid insulating part are cast into a whole, and the contact part of the grading ring and the solid insulating part has stress in production and subsequent use.
At present, in order to realize even electric field, most advanced potential department need have sufficient camber, leads to equalizer ring volume size to need set up to great, and the stress of aggravation solid insulation spare and equalizer ring contact department easily causes in the solid insulation spare and produces the fracture with equalizer ring contact department, influences the insulating properties of solid insulation spare.
In summary, the problem that the contact portion of the grading ring and the grading ring is prone to crack due to the overlarge volume of the grading ring is a problem to be solved urgently by those skilled in the art.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides an equalizer ring, its main part twists into hollow spring form, and is small, the surface area is big, compares in cylindric equalizer ring, can be when pouring as an organic whole with solid insulation spare fully contact, prevent among the solid insulation spare with the stress of equalizer ring contact department too big, produce the fracture with equalizer ring contact department in avoiding the solid insulation spare, ensure that the insulating properties of solid insulation spare avoids influencing. The utility model discloses still provide the electric field shielding structure and the solid insulation transformer who use above-mentioned equalizer ring respectively, make solid insulation spare avoid the fracture, guarantee solid insulation spare's good insulating properties.
In order to achieve the above object, the utility model provides a following technical scheme:
the utility model provides a grading ring for solid insulation transformer, includes the main part, the main part twists into hollow spring form, and the main part end to end encloses into the closed loop.
Preferably, in the above pressure equalizing ring, the cross section of the hollow portion of the main body is circular or elliptical, or the outer peripheral profile of the cross section is formed by a logarithmic curve, or
The periphery outline of the section comprises two parallel lines and two semicircular rings, wherein the parallel lines and the semicircular rings are alternately arranged and are sequentially connected end to end.
Preferably, the equalizer ring further comprises a plurality of mounting members, and the mounting members are fixed to the main body at intervals.
Preferably, in the above grading ring, the mounting member and the main body are separated from each other and fixedly connected by welding; or the mounting part and the main body are of an integrated structure.
Preferably, in the above-mentioned equalizer ring, the mounting member is an insert nut, and the insert nut is located on a preset side of the main body.
Preferably, in the above voltage-equalizing ring, the main body is a metal main body or a semiconductive material main body.
Preferably, in the above pressure equalizing ring, the closed ring is a circular ring, an elliptical ring, or a rectangular ring.
The utility model provides an electric field shielding structure of solid insulation transformer, includes first potential piece, second potential piece, set up in first potential piece with solid insulation between the second potential piece to and equalizer ring, equalizer ring is arbitrary one of above-mentioned technical scheme equalizer ring, equalizer ring install in solid insulation, and equalizer ring with second potential piece short circuit.
Preferably, in the electric field shielding structure, the grading ring is poured as an insert inside the solid insulating member, or the grading ring is assembled on the surface of the solid insulating member.
The solid insulation transformer comprises an electric field shielding structure, and the electric field shielding structure is the electric field shielding structure in the technical scheme.
The utility model provides an equalizing ring for solid insulation transformer, including the main part, the main part twists into hollow spring form to the main part end to end encloses into the closed loop.
The main part twists into hollow spring form in the above-mentioned equalizer ring, has characteristics small, that the surface area is big, compares in prior art equalizer ring that the cylinder main part constitutes, can be when pouring as an organic whole with solid insulation spare fully contact, prevent among the solid insulation spare with the stress of equalizer ring contact department too big, avoid producing the fracture with equalizer ring contact position department in the solid insulation spare, ensure that the insulating properties of solid insulation spare avoids influencing.
The utility model discloses still provide the electric field shielding structure and the solid insulation transformer who use above-mentioned equalizer ring respectively, make solid insulation spare avoid the fracture, guarantee solid insulation spare's good insulating properties.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a simulation diagram of the electric field distribution between the high and low voltage sides of a conventional solid insulation transformer;
fig. 2 is a schematic structural view of the grading ring provided in the embodiment of the present invention;
fig. 3 is a schematic pitch diagram of a main body according to an embodiment of the present invention;
fig. 4 is a simulation diagram of an electric field distribution status of the electric field shielding structure according to an embodiment of the present invention;
fig. 5 is a simulation diagram of an electric field distribution situation of the electric field shielding structure in the high-frequency magnetic field according to the embodiment of the present invention;
fig. 6 is a schematic diagram of an electric field shielding structure according to an embodiment of the present invention.
Wherein, in fig. 2-6:
a grading ring 101; a main body 111; a mounting member 112; a hollow portion 113; a first potential element 102; a second potential element 103; a solid insulator 104.
Detailed Description
The embodiment of the utility model discloses grading ring, its main part twists into hollow spring form, compares in cylindric grading ring, and weight reduction effectively reduces in the solid insulation spare with the stress of grading ring contact department, produces the fracture with grading ring contact department in avoiding the solid insulation spare, prevents that the insulating properties of solid insulation spare from being influenced. The embodiment of the utility model provides a still openly use the electric field shielding structure and the solid insulation transformer of above-mentioned equalizer ring respectively, make solid insulation spare avoid the fracture, guarantee solid insulation spare's good insulating properties.
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 2-6, an embodiment of the present invention provides a grading ring for a solid insulation transformer, including a main body 111, the main body 111 is twisted into a hollow spring shape, and the main body 111 is connected end to form a closed ring.
The main body 111 in the grading ring 101 is twisted into a hollow spring shape, and the grading ring has the characteristics of small volume and large surface area, and compared with the grading ring 101 formed by the cylindrical main body 111 in the prior art, the grading ring can be fully contacted with the solid insulating piece 104 when being cast into a whole with the solid insulating piece 104, so that the stress at the contact part of the solid insulating piece 104 and the grading ring 101 is prevented from being overlarge, the contact part of the solid insulating piece 104 and the grading ring is prevented from cracking, and the insulating property of the solid insulating piece 104 is prevented from being influenced.
In the above grading ring 101, the hollow portion 113 of the main body 111 needs to have a certain curvature to optimize the shielding effect at the potential cut-off, specifically, the cross section of the hollow portion 113 of the main body 111 may be set to be circular or elliptical, or the outer peripheral contour of the cross section may be formed by a logarithmic curve, or the outer peripheral contour of the cross section may include two parallel lines, two semicircular rings, the parallel lines and the semicircular rings are alternately arranged, and the four are sequentially connected end to form the shape shown in fig. 6.
For ease of assembly, the grading ring 101 further includes a plurality of mounting members 112, the mounting members 112 being spaced apart and secured to the body 111.
It will be appreciated by those skilled in the art that the body 111 is twisted into a spring shape, rather than a solid or hollow cylindrical structure, and has low strength, and the plurality of mounting members 112 are spaced apart on the body 111 to facilitate the body 111 to be securely fixed to the surface of the solid insulation member 104 by the mounting members 112, or to facilitate the body 111 serving as an insert to be mounted in a mold for casting the solid insulation member 104 by the mounting members 112 when the body 111 is cast in the solid insulation member 104.
The mounting part 112 and the main body 111 are mutually separated and fixedly connected in a welding mode; or the mounting member 112 may be a unitary structure with the body 111.
The grading ring 101 is convenient to recycle by assembling the mounting piece 112 on the solid insulating piece 104 at the later stage; when the grading ring 101 is used as an insert and poured into the solid insulator 104, the breakdown field strength inside the solid insulator 104 is higher than that in the air, so that the size of the grading ring 101 can be reduced.
When the grading ring 101 is used as an insert and cast-molded with the solid insulator 104, the grading ring can be fully contacted with the insulating material of the solid insulator 104, so that the connection tightness between the body 112 and the solid insulator 104 is improved, and an interface between the solid insulator 104 and the body 112 is avoided. Accordingly, the mounting member 112 is configured as an insert nut; the insert nut can be exposed out of the solid insulating part 104 and is used for leading out the potential of the grading ring 101; the insert nut is preferably placed on a predetermined side of the body 111, the predetermined side being a side of the body 111 close to the potential to which the body 111 is connected, as shown in fig. 6, in order to reduce the size of the body 111.
The main body 111 is a metal main body (such as a galvanized copper main body) or a semi-conductive material main body, preferably, the material of the main body 111 has good wettability with the solid insulator 104, and the thermal expansion systems of the main body 111 and the solid insulator 104 are close to each other, so as to further improve the effect of protecting the interface formed between the solid insulator 104 and the main body 111.
In specific application, the wire diameter and the pitch of the main body 111 are optimally designed, so that adjacent turns can be shielded, the voltage equalizing effect is realized by using the least materials, and particularly, when a high-frequency magnetic field is applied, the eddy current effect can be reduced by using the thin wire diameter for the main body 111, as shown in fig. 5.
The closed ring enclosed by the main body 111 can be a circular ring, an elliptical ring, or a rectangular ring as shown in fig. 2, which is not limited in this embodiment. The shape of the closed ring and the overall external dimension can be adjusted according to the shielded boundary, the closed ring is flexible, the curvature of the bent part of the main body 111 needs to be noticed during adjustment, the power plant distortion caused by the increase of the distance between adjacent turns is prevented, and the pitch of the bent part can be adjusted if necessary.
The solid insulation 104 may be provided as an epoxy cast solid insulation 104.
The main body 111 of the grading ring 101 provided by the embodiment is twisted into a spring shape, so that compared with a cylindrical grading ring in the prior art, the material can be saved on the basis of realizing the same shielding effect.
As shown in fig. 6, an embodiment of the present invention further provides an electric field shielding structure of a solid insulation transformer, which includes a first potential part 102, a second potential part 103, a solid insulation part 104 disposed between the first potential part 102 and the second potential part 103, and a grading ring 101; the grading ring 101 is the grading ring 101 provided in the above embodiment; the grading ring 101 is mounted on the solid insulator 104, and the grading ring 101 is shorted to the second potential member 103.
As shown in fig. 4, a simulation diagram of the electric field distribution of the electric field shielding structure provided in this embodiment is that a first electric potential of the first electric potential device 102 in the electric field and a second electric potential of the second electric potential device 103 in the electric field are respectively regarded as planes; in a non-cut-off region, a uniform electric field is basically formed between the first potential and the second potential, and the electric field is obviously distorted when no equalizing ring is arranged at the cut-off position (as shown in fig. 1), and the equalizing ring 101 is in short circuit with the second potential after the equalizing ring 101 provided by the embodiment is arranged, so that the equalizing ring 101 has a certain curvature even if the equalizing ring 101 is closer to the first potential, the electric field distribution is obviously improved, and the electric field shielding of the original cut-off position of the second potential is realized.
The grading ring 101 can be poured into the solid insulation piece 104 as an insert, and an insert nut of the grading ring 101 is exposed out of the solid insulation piece 104 and used for leading out the potential of the grading ring 101 and enabling the potential to be in short circuit with the second potential piece 103. Of course, the grading ring 101 may also be assembled on the surface of the solid insulator 104 after the solid insulator 104 is molded by casting, which is not limited in this embodiment.
The embodiment of the utility model provides a still provide a solid insulation transformer, including electric field shielding structure, electric field shielding structure is the electric field shielding structure that above-mentioned embodiment provided.
The grading ring 101 provided by the above embodiment is respectively applied to the electric field shielding structure and the solid insulation transformer provided by this embodiment, so that the solid insulation member 104 is prevented from cracking and forming an interface, and the solid insulation member 104 is ensured to have good insulation performance. Of course, the electric field shielding structure and the solid insulation transformer provided in this embodiment also have other effects related to the grading ring 101 provided in the above embodiments, and are not described herein again.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The grading ring is used for a solid insulation transformer and is characterized by comprising a main body, wherein the main body is twisted into a hollow spring shape, and the main body is connected end to form a closed ring.
2. Grading ring according to claim 1, characterized in that the hollow part of the body has a circular or oval cross-section or the peripheral profile of the cross-section consists of a logarithmic curve, or
The periphery outline of the section comprises two parallel lines and two semicircular rings, wherein the parallel lines and the semicircular rings are alternately arranged and are sequentially connected end to end.
3. The grading ring of claim 1, further comprising a plurality of mounting members spaced apart from and secured to the body.
4. The grading ring according to claim 3, wherein the mounting member is separate from the main body and fixedly connected thereto by welding; or the mounting part and the main body are of an integrated structure.
5. The grading ring of claim 3, wherein the mounting member is an insert nut, and wherein the insert nut is located on a predetermined side of the body.
6. The grading ring of claim 1, wherein the body is a metal body or a body of semiconducting material.
7. The grading ring of claim 1, wherein the closed ring is a circular ring, an elliptical ring, or a rectangular ring.
8. The utility model provides an electric field shielding structure of solid insulation transformer, its characterized in that includes first potential piece, second potential piece, set up in first potential piece with solid insulation between the second potential piece to and equalizer ring, equalizer ring is the arbitrary one of claim 1-7 equalizer ring, equalizer ring install in solid insulation, and equalizer ring with second potential piece short circuit.
9. The electric field shielding structure according to claim 8, wherein the grading ring is cast inside the solid insulator as an insert, or the grading ring is assembled on the surface of the solid insulator.
10. A solid insulated transformer comprising an electric field shielding structure, characterized in that the electric field shielding structure is according to claim 8 or 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221865686.7U CN218782893U (en) | 2022-07-19 | 2022-07-19 | Grading ring, solid insulation transformer and electric field shielding structure thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221865686.7U CN218782893U (en) | 2022-07-19 | 2022-07-19 | Grading ring, solid insulation transformer and electric field shielding structure thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218782893U true CN218782893U (en) | 2023-03-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221865686.7U Active CN218782893U (en) | 2022-07-19 | 2022-07-19 | Grading ring, solid insulation transformer and electric field shielding structure thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218782893U (en) |
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2022
- 2022-07-19 CN CN202221865686.7U patent/CN218782893U/en active Active
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