CN211788578U - Voltage-equalizing ball for transformer - Google Patents
Voltage-equalizing ball for transformer Download PDFInfo
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- CN211788578U CN211788578U CN202020468451.9U CN202020468451U CN211788578U CN 211788578 U CN211788578 U CN 211788578U CN 202020468451 U CN202020468451 U CN 202020468451U CN 211788578 U CN211788578 U CN 211788578U
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- ball
- equalizing ball
- sleeve pressure
- transformer
- flanging
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Abstract
The utility model relates to a transformer voltage-sharing ball. The device comprises a sleeve pressure-equalizing ball positioned on the inner side and a molded insulating part positioned on the outer side, wherein two ends of the sleeve pressure-equalizing ball are provided with flanges in the direction of an inner cavity; at least one group of insulating layers and stay groups are arranged between the inner and outer forming pieces at intervals from inside to outside, the innermost insulating layer is coated to the inner side of the flanging of the sleeve pressure-equalizing ball, and the lower surface of the epoxy resin layer on the inner side of the flanging of the upper port of the sleeve pressure-equalizing ball is flush with the bottom edge of the flanging.
Description
Technical Field
The utility model relates to a transformer voltage-sharing ball.
Background
With the construction of a conservation-oriented society and an extra-high voltage power grid, 750kV ultra-high voltage transformers and reactors are applied more and more, the competition among enterprises is larger and larger, and the product cost is reduced on the premise of ensuring the product performance. The high voltage of the 750kV ultra-high voltage transformer and the reactor generally adopts an indirect outlet structure, namely, the 750kV high-voltage sleeve is led out of the oil tank through the lifting seat and the outlet device to ensure the insulation distance of the 750kV high-voltage outlet. Meanwhile, the overall volume of the ultrahigh voltage transformer and the reactor is increased, the material cost is increased, and the economical efficiency is reduced. And the direct wire outlet structure has the advantages that the wire outlet device needs to be manufactured in an external cooperation mode, is difficult to process, has higher cost, is easy to damp and deform, cannot observe the specific positions of the sleeve pressure equalizing ball and the lead wire, and has poorer workshop operability.
Disclosure of Invention
The utility model aims at providing an insulating assembly structure of 750kV ultra-high voltage transformer, reactor sleeve pipe pressure-equalizing ball.
The utility model comprises a sleeve pressure-equalizing ball positioned at the inner side and a molded insulating part positioned at the outer side, wherein both ends of the sleeve pressure-equalizing ball are provided with flanges in the direction of the inner cavity; at least one group of insulating layers and stay groups are arranged between the inner and outer forming pieces at intervals from inside to outside, the innermost insulating layer is coated to the inner side of the flanging of the sleeve pressure-equalizing ball, and the lower surface of the epoxy resin layer on the inner side of the flanging of the upper port of the sleeve pressure-equalizing ball is flush with the bottom edge of the flanging.
Furthermore, an epoxy resin layer is arranged on the boundary of the inner insulating layer of the flanging of the lower port of the sleeve pressure equalizing ball.
Furthermore, the stay bar group consists of a group of stay bars arranged at intervals from one end of the sleeve pressure equalizing ball to the other end of the sleeve pressure equalizing ball.
Furthermore, two ends of the molded insulating part are flanged outwards, and the stay is arranged from the initial position of the flanged outwards at one end of the molded insulating part to the initial position of the flanged outwards at the other end.
Further, the arc of the spacing between the struts is 50-70 degrees.
Furthermore, the sleeve pressure-equalizing ball consists of a shell and a flange plate fixedly connected with the shell in the shell, and the flange plate is positioned at the upper part of the inner cavity of the shell.
Specifically, the length of the insulating layer on the inner side surface of the flanging of the pressure equalizing ball of the sleeve is 5-15 mm.
Specifically, the thickness of each insulating layer is 3-10 mm, and the thickness of each stay is 10-20 mm.
Specifically, the thickness of each shaped insulator is 3-10 mm.
Furthermore, a one-level or two-level or three-level insulating layer and a brace group are arranged between the sleeve pressure equalizing ball and the molded insulating part.
The utility model can omit the lifting seat and the wire outlet device of the traditional wire outlet structure, and can effectively ensure the electrical performance of the high-voltage sleeve structure of the 750kV ultrahigh-voltage transformer and the reactor; meanwhile, the sleeve is directly arranged on the oil tank body, so that the shearing effect of the traditional outlet structure independently extending out of the lifting seat on the oil tank body is avoided, the shock resistance of the 750kV ultrahigh-voltage transformer and the reactor is improved, and the long-term safe operation of the reactor is ensured.
Description of the drawings:
FIG. 1 is a cross-sectional view of an embodiment of the present invention;
FIG. 2 is a cross-sectional view A-A of FIG. 1;
FIG. 3 is an enlarged view of point B in FIG. 1;
the device comprises a flange plate 1, a sleeve pressure equalizing ball 2, a sleeve pressure equalizing ball 3, a stay 4, an insulating layer 5, a molded insulating part 6 and an epoxy resin layer.
Detailed Description
As shown, this embodiment includes the innermost sleeve equalizing ball 2 and the outermost profiled insulator 5. The sleeve pressure equalizing ball 2 consists of a shell and a flange plate 1 in the shell. The casing of the sleeve pressure-equalizing ball 2 has two open ends, and the end is bent towards the inner cavity. The flange plate 1 is positioned at the upper part of the cavity and is welded with the shell into a whole or manufactured into a whole.
Outside the housing of the thimble equalizing ball 2, an insulating layer 4 is attached to the outer surface of the housing. The insulating layer 4 covers the entire outer surface of the thimble equalizing ball 2 and the bent portion of the end opening of the thimble equalizing ball 2 and extends to the inner side of the bent portion of the thimble equalizing ball 2. An epoxy resin layer is arranged at the inner side of the turning part of the lower port of the sleeve pressure equalizing ball 2 and the edge of the insulating layer 4 to prevent the insulating layer from being attached insecurely and separating from the sleeve pressure equalizing ball 2. Epoxy resin is poured on the inner side of the bending part at the upper port of the upper sleeve pressure-equalizing ball 2, so that the epoxy resin is flush with the bending part of the upper sleeve pressure-equalizing ball 2 to prevent gas from being trapped at the bending part.
And a group of supporting strips 3 are distributed outside the insulating layer 4 at intervals along the circumferential direction of the shell to play a role in separating oil gaps. Each stay 3 is longitudinally arranged from one end of the shell to the other end, and the radian of the interval between two adjacent stays 3 is 60 degrees, generally, 45-90 degrees or other radians, so that the effective support of the inner part and the outer part of the stay is achieved. The width of the stay 3 may be 20-50 mm and the thickness thereof may be 10-20 mm. According to the insulating requirement to transformer voltage-sharing ball, can have a plurality of insulating layers between sleeve pipe voltage-sharing ball 2 and the shaping insulating part 5, support through a set of interval installation stay 3 between every insulating layer, along with the increase of insulating layer diameter, the interval radian of two adjacent stays 3 reduces to satisfy the requirement of support intensity.
And a molded insulating piece 5 is arranged outside the stay 3 at the outermost layer, and the thickness of the molded insulating piece 5 is 3-10 mm. The two ends of the shaped insulator 5 are bent outward, and the two ends of the stay 3 correspond to the starting positions of the bending at the two ends of the shaped insulator 5.
The insulating layer 4, the stay 3 and the shaped insulating member 5 in this embodiment may be made of kraft pulp.
The voltage-sharing ball insulation assembly structure can well protect the electrified part at the tail part of the sleeve, namely, the electric field range at the tail part of the 750kV sleeve is covered, the installation and the operation are convenient, and the manufacturability is improved. The stability of the product quality is ensured.
Claims (10)
1. A voltage-sharing ball of a transformer is characterized in that: the device comprises a sleeve pressure-equalizing ball positioned on the inner side and a molded insulating part positioned on the outer side, wherein two ends of the sleeve pressure-equalizing ball are provided with flanges in the direction of an inner cavity; at least one group of insulating layers and stay groups are arranged between the inner and outer forming pieces at intervals from inside to outside, the innermost insulating layer is coated to the inner side of the flanging of the sleeve pressure-equalizing ball, and the lower surface of the epoxy resin layer on the inner side of the flanging of the upper port of the sleeve pressure-equalizing ball is flush with the bottom edge of the flanging.
2. The transformer balancing ball of claim 1, wherein: an epoxy resin layer is arranged at the boundary of the insulating layer at the lower port flanging of the sleeve pressure equalizing ball.
3. The transformer balancing ball of claim 2, wherein: the stay bar group is composed of a group of stay bars which are arranged at intervals and are from one end to the other end of the sleeve pressure equalizing ball.
4. The transformer balancing ball of claim 3, wherein: the two ends of the formed insulating part are flanged outwards, and the stay is arranged from the initial position of the flanged outwards at one end of the formed insulating part to the initial position of the flanged outwards at the other end.
5. The transformer voltage-sharing ball of claim 3 or 4, wherein: the arc of the interval between the supporting strips is 45-90 degrees.
6. The transformer balancing ball of any one of claims 1 to 4, wherein: the sleeve pressure equalizing ball consists of a shell and a flange plate fixedly connected with the shell in the shell, and the flange plate is positioned at the upper part of the inner cavity of the shell.
7. The transformer balancing ball of any one of claims 1 to 4, wherein: the length of the insulating layer on the inner side surface of the flanging of the pressure equalizing ball of the sleeve is 5-15 mm.
8. The transformer balancing ball of any one of claims 1 to 4, wherein: the thickness of each insulating layer is 3-10 mm, and the thickness of each stay is 10-20 mm.
9. The transformer balancing ball of any one of claims 1 to 4, wherein: the thickness of each shaped insulator is 3-10 mm.
10. The transformer balancing ball of any one of claims 1 to 4, wherein: one-level or two-level or three-level insulating layers and brace groups are arranged between the sleeve pressure equalizing ball and the molded insulating part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020468451.9U CN211788578U (en) | 2020-04-02 | 2020-04-02 | Voltage-equalizing ball for transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020468451.9U CN211788578U (en) | 2020-04-02 | 2020-04-02 | Voltage-equalizing ball for transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211788578U true CN211788578U (en) | 2020-10-27 |
Family
ID=72959699
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020468451.9U Active CN211788578U (en) | 2020-04-02 | 2020-04-02 | Voltage-equalizing ball for transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211788578U (en) |
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2020
- 2020-04-02 CN CN202020468451.9U patent/CN211788578U/en active Active
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