Electrical insulation structure of converter transformer bushing
The electrical insulation structure with tilted insulators and a drip ring addresses dust accumulation by enhancing cleaning efficacy, ensuring reliable and safe operation of converter transformer bushings.
Patent Information
- Application Number
- CN202420994602.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-09
- Publication Date
- 2024-12-27
- Estimated Expiration
- 2034-05-09
AI Technical Summary
Traditional converter transformer bushing designs fail to address the issue of dust accumulation on the insulator surface, which degrades insulation performance and increases the risk of flashover, especially in polluted environments.
An electrical insulation structure with tilted insulators and a drip ring to facilitate rainwater washing, utilizing multiple insulators with varying diameters and angles to enhance cleaning efficacy.
The structure effectively removes dust through rainwater flushing, maintaining insulation resistance, preventing flashover, and extending the bushing's service life while reducing maintenance costs.
Smart Images
Figure CN222260773U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of converter transformer bushings, and in particular relates to an electrical insulation structure of a converter transformer bushing. Background Art
[0002] In the power system, the converter transformer bushing is the main insulation structure connecting the equipment inside and outside the valve hall. Its insulation performance is crucial to ensure the safe operation of the system. The traditional converter transformer bushing design, such as the oil-impregnated paper capacitor structure and the SF6 gas and epoxy impregnated capacitor core composite insulation structure, has certain insulation performance. However, in actual operation, the insulator surface is prone to adsorb dust. Especially in a severely polluted environment, the accumulation of dust and other pollutants will significantly reduce the insulation performance and increase the risk of flashover.
[0003] In the prior art, the insulation structure design of the converter transformer bushing mainly considers the electrical performance of the internal and external insulation, such as designing the main insulation structure of the bushing by the equal margin method, and using the finite element method to simulate and analyze its electrical, thermal, and mechanical multi-physical fields. However, these designs often ignore the pollution problem on the surface of the insulator. The adsorption of dust not only leads to the degradation of insulation performance, but also may form a conductive path on the surface of the insulator due to the influence of humidity, causing flashover, thereby threatening the safe operation of the entire power system.
[0004] Therefore, it is necessary to remove the dust on the insulators of the circulating current transformer. Utility Model Content
[0005] The utility model aims to provide an electrical insulation structure for a converter transformer bushing, which can improve the reliability and safety of the bushing, extend its service life and reduce maintenance costs.
[0006] The technical solution adopted by the utility model is as follows:
[0007] The electrical insulation structure of the converter transformer bushing comprises a top mounting wire, an oil pillow is arranged on the top of the top mounting wire, a terminal is arranged on the top of the oil pillow, a bottom mounting wire is arranged on the bottom of the top mounting wire, and the bottom mounting wire is connected to the top mounting wire through a flange, and a plurality of bottom insulators are arranged on the outer side of the bottom mounting wire;
[0008] A plurality of insulating components are arranged on the outer side of the top mounting wire, and the insulating components are used to block the current.
[0009] Each of the insulating components includes a mounting sleeve assembled on the outside of the top mounting line, a first top insulator is arranged on the outside of the mounting sleeve, a second top insulator is arranged on the outside of the mounting sleeve and at the bottom of the first top insulator, and a third top insulator is arranged on the outside of the mounting sleeve and at the bottom of the second top insulator.
[0010] A drip ring is installed at the bottom of the first top insulator.
[0011] The first top insulator, the second top insulator and the third top insulator are all arranged to be inclined downward from the center position to the edge position.
[0012] The diameter of the third top insulator is greater than the diameter of the second top insulator, and the diameter of the second top insulator is greater than the diameter of the first top insulator.
[0013] The first top insulator, the second top insulator and the third top insulator are all hollow.
[0014] The technical effects achieved by the utility model are:
[0015] In the utility model, the first top insulator, the second top insulator and the third top insulator are all tilted downward from the center position to the edge position, and the tilt angle of the first top insulator is between 60 degrees and 70 degrees downward from the horizontal plane, so that the rainwater falls faster, and the tilt angle of the second top insulator is between 40 degrees and 50 degrees downward from the horizontal plane, so that the rainwater can fall slowly at the second top insulator, so that the rainwater can stay at the second top insulator for a longer time, and the cleaning effect time for the second top insulator is also longer. The first top insulator, the second top insulator and the third top insulator can effectively remove accumulated dust under the flushing of rainwater, thereby maintaining the insulation resistance of the first top insulator, the second top insulator and the third top insulator, preventing flashover caused by pollution, thereby improving the reliability and safety of the bushing, extending its service life, and reducing maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is a structural schematic diagram of the utility model;
[0017] Figure 2 It is a schematic diagram of the structure between the first top insulator, the second top insulator and the bottom insulator in the utility model;
[0018] Figure 3 It is a schematic diagram of the structure among the first top insulator, the second top insulator and the third top insulator in the utility model.
[0019] In the accompanying drawings, the components represented by the reference numerals are listed as follows:
[0020] 1. Top mounting wire; 2. Oil pillow; 3. Terminal block; 4. Bottom mounting wire; 5. Bottom insulator; 6. Flange; 7. Mounting sleeve; 8. First top insulator; 9. Second top insulator; 10. Drip ring; 11. Third top insulator. DETAILED DESCRIPTION
[0021] In order to make the purpose and advantages of the utility model more clear, the utility model is specifically described in combination with the following embodiments. It should be understood that the following text is only used to describe one or several specific implementations of the utility model, and does not strictly limit the protection scope of the specific request of the utility model.
[0022] like Figure 1-3 As shown, the electrical insulation structure of the converter transformer bushing includes a top installation wire 1, the top installation wire 1 is provided with a conductor inside, an oil pillow 2 is provided on the top of the top installation wire 1, and the oil pillow 2 is used to set oil inside the top installation wire 1, thereby playing an insulating role, and the top installation wire 1 is used to provide oil for the top installation wire 1. A wiring terminal 3 is installed on the top of the oil pillow 2, and the wiring terminal 3 is used to connect the transformer with the external busbar, which is usually made of metal copper or copper alloy, etc., and a bottom installation wire 4 is provided at the bottom of the top installation wire 1. The bottom installation wire 4 is arranged inside the transformer and connected to the body of the transformer, and the bottom installation wire 4 is connected to the top installation wire 1 through a flange 6, and a plurality of bottom insulators 5 are provided on the outside of the bottom installation wire 4, and the bottom insulators 5 are also used to insulate the bottom installation wire 4;
[0023] The above are all existing mature technologies, and will not be elaborated here;
[0024] A plurality of insulating components are arranged on the outer side of the top mounting wire 1, and the insulating components are used to block the current.
[0025] See attached Figure 3 Each insulating component includes a mounting sleeve 7 assembled on the outside of the top mounting wire 1, the mounting sleeve 7 is in contact with the top mounting wire 1, and is composed of one of cable insulation paper and aluminum foil paperboard or the two overlap each other;
[0026] A first top insulator 8 is arranged on the outside of the mounting sleeve 7, a second top insulator 9 is arranged on the outside of the mounting sleeve 7 and at the bottom of the first top insulator 8, a drip ring 10 is arranged at the bottom of the first top insulator 8, and the drip ring 10 is arranged so that when it rains, rainwater can slide and drip onto the second top insulator 9 through the drip ring 10, thereby cleaning the impurities on the second top insulator 9, and a third top insulator 11 is arranged on the outside of the mounting sleeve 7 and at the bottom of the second top insulator 9. The mounting sleeve 7, the second top insulator 9 and the third top insulator 11 are all made of insulating materials, which can be ceramics or other materials;
[0027] The first top insulator 8, the second top insulator 9 and the third top insulator 11 are all arranged to be tilted downward from the center position to the edge position. The tilt angle of the first top insulator 8 is preferably between 60 degrees and 70 degrees downward from the horizontal plane, so that the rainwater falls faster, and the tilt angle of the second top insulator 9 is preferably between 40 degrees and 50 degrees downward from the horizontal plane, so that the rainwater can fall slowly at the second top insulator 9, so that the rainwater can stay at the second top insulator 9 for a longer time, and the cleaning effect time of the second top insulator 9 is also longer;
[0028] The inclination angle of the third top insulator 11 is between the inclination angles of the first top insulator 8 and the second top insulator 9, so that the third top insulator 11 slides down faster when receiving rainwater, and prevents stains from staying on the third top insulator 11 for a long time. The diameter of the third top insulator 11 is larger than the diameter of the second top insulator 9, and the diameter of the second top insulator 9 is larger than the diameter of the first top insulator 8. Through this arrangement, in this way, when it rains, the surfaces of the first top insulator 8, the second top insulator 9 and the third top insulator 11 can all be drenched with rainwater, so that the rainwater can penetrate the first top insulator 8, the second top insulator 9 and the third top insulator 11. The impurities on the insulator 9 and the third top insulator 11 are effectively cleaned. When it is windy, the wind can drive rain to the second top insulator 9 and the third top insulator 11, which are closer to the inner side of the top installation line 1, thereby improving the cleaning effect and avoiding the resistance of the first top insulator 8, the second top insulator 9 and the third top insulator 11 to be reduced due to factors such as dust, resulting in flashover. The first top insulator 8, the second top insulator 9 and the third top insulator 11 are all hollow. Through this arrangement, the first top insulator 8, the second top insulator 9 and the third top insulator 11 will not be too heavy after being installed on the top installation line 1.
[0029] The above is only a preferred embodiment of the present invention. It should be noted that, for ordinary technicians in the technical field, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention. The structures, devices and operating methods not specifically described and explained in the present invention shall be implemented according to the conventional means in the field unless otherwise specified and limited.
Claims
1. An electrical insulation structure for a converter transformer bushing, comprising a top mounting wire (1), characterized in that: An oil pillow (2) is provided on the top of the top mounting line (1), a connection terminal (3) is installed on the top of the oil pillow (2), a bottom mounting line (4) is provided on the bottom of the top mounting line (1), and the bottom mounting line (4) is connected to the top mounting line (1) via a flange (6), and a plurality of bottom insulators (5) are provided on the outside of the bottom mounting line (4); A plurality of insulating components are provided on the outside of the top installation line (1), and the insulating components are used to block current.
2. The electrical insulation structure of the converter transformer bushing according to claim 1, characterized in that: Each of the insulating components comprises a mounting sleeve (7) assembled on the outside of the top mounting line (1); a first top insulator (8) is arranged on the outside of the mounting sleeve (7); a second top insulator (9) is arranged on the outside of the mounting sleeve (7) and located at the bottom of the first top insulator (8); and a third top insulator (11) is arranged on the outside of the mounting sleeve (7) and located at the bottom of the second top insulator (9).
3. The electrical insulation structure of the converter transformer bushing according to claim 2, characterized in that: A drip ring (10) is installed at the bottom of the first top insulator (8).
4. The electrical insulation structure of the converter transformer bushing according to claim 2, characterized in that: The first top insulator (8), the second top insulator (9) and the third top insulator (11) are all arranged to tilt downward from the center position to the edge position.
5. The electrical insulation structure of the converter transformer bushing according to claim 2, characterized in that: The diameter of the third top insulator (11) is greater than the diameter of the second top insulator (9), and the diameter of the second top insulator (9) is greater than the diameter of the first top insulator (8).
6. The electrical insulation structure of a converter transformer bushing according to claim 2, characterized in that: The first top insulator (8), the second top insulator (9) and the third top insulator (11) are all hollow.