A transformer without partial discharge test and winding structure thereof

Abstract

The utility model discloses a kind of partial discharge test transformer and its winding structure, comprising: mounting seat, the inner wall of mounting seat side is fixedly connected with circulating device, the outer wall of mounting seat top is fixedly connected with cover plate by bolt;The inner wall of mounting seat is equipped with oil cavity, the outer wall of mounting seat top is equipped with sealing groove, the utility model relates to transformer winding technical field, the circulating device and mounting seat, through circulating pump drive insulating oil is formed closed loop by pumping tube, filter element, liquid injection pipe, the heat dissipation fin of pumping tube outer wall, while taking away winding and core heat, filter element continuously filters impurity, maintains the high insulation performance of insulating oil, through the cooperation of sealing ring in the bottom of cover plate and the sealing groove in the top of mounting seat, sealing gasket and oil cavity inner wall are closely contacted simultaneously, effectively isolate external humidity and impurity, rubber pad as elastic buffer layer, vibration generated under the action of electromagnetic force of winding can be absorbed, prevent insulation wear.

Description

Technical Field

[0001] This utility model relates to the field of transformer winding technology, specifically to a partial discharge-free test transformer and its winding structure. Background Technology

[0002] In the field of power equipment research and development and testing, the partial discharge-free test transformer is the core equipment for evaluating insulation performance, and its performance directly affects the accuracy of test data and equipment safety.

[0003] Currently, traditional test transformers generally suffer from problems such as high partial discharge, low heat dissipation efficiency, and short insulation life. The insulating oil is easily degraded by external moisture and impurities during long-term operation. At the same time, the windings and core of the transformer generate a lot of heat when it is working. Existing heat dissipation methods are often unable to efficiently remove this heat, which leads to an increase in the internal temperature of the equipment, accelerates the aging of the insulation materials, reduces the insulation performance, and significantly shortens the service life of the equipment. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this utility model provides a partial discharge-free test transformer and its winding structure, which solves the problem of heat generated by the windings and core of traditional test transformers, which leads to increased internal temperature and accelerated aging of insulation materials.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A partial discharge-free test transformer and its winding structure include: a mounting base, a circulation device fixedly connected to the inner wall of the side of the mounting base, and a cover plate fixedly connected to the outer wall of the top of the mounting base by bolts; an oil cavity is formed in the inner wall of the mounting base, a sealing groove is formed in the outer wall of the top of the mounting base, a base is fixedly connected to the inner wall of the bottom of the oil cavity, an iron core block is fixedly connected to the outer wall of the top of the base, mounting frames are symmetrically fixedly connected to the outer wall of the iron core block, rubber pads are symmetrically fixedly connected to the outer wall of the iron core block, and winding wires are fixedly connected to the outer wall of the rubber pads.

[0009] Preferably, the winding wire is fixed to the outside of the core block by a rubber pad, the mounting bracket is symmetrically arranged at the upper and lower ends of the core block, and the outer wall of the mounting bracket is in contact with the outer wall of the winding wire. The rubber pad acts as an elastic buffer layer to reduce mechanical vibration between the winding and the core, and avoid insulation wear and partial discharge caused by vibration. The mounting bracket is symmetrically arranged at the upper and lower ends of the core to apply axial constraint to the winding wire and prevent the winding wire from being displaced under the action of electromagnetic force.

[0010] Preferably, the circulation device includes a circulation pump, a spray pipe is fixedly connected to the outer wall of the top of the circulation pump by bolts, a filter element is fixedly connected to the outer wall of the bottom of the circulation pump by bolts, a suction pipe is fixedly connected to the outer wall of the bottom of the filter element by bolts, and heat dissipation fins are fixedly connected to the outer wall of the suction pipe.

[0011] Preferably, the outer wall of the spray pipe is fixedly connected to the inner wall of the top of the mounting base, the outer wall of the suction pipe on the side away from the filter element is fixedly connected to the inner wall of the bottom of the mounting base, and the outer walls of the heat dissipation fins and the circulation pump are fixedly connected to the outer wall of the mounting base. After the circulation pump is started, insulating oil is drawn from the bottom of the oil chamber through the suction pipe. After impurities are filtered by the filter element, the clean insulating oil is sprayed onto the surface of the winding wire through the spray pipe. The heat dissipation fins on the outer wall of the suction pipe increase the contact area between the oil and the outside world, and heat exchange is realized simultaneously during the oil circulation process to reduce the oil temperature.

[0012] Preferably, a high-pressure sleeve is fixedly connected to the inner wall of the top of the cover plate, and a sealing ring and a sealing gasket are fixedly connected to the inner wall of the bottom of the cover plate.

[0013] Preferably, the outer wall of the sealing ring is slidably connected to the inner wall of the sealing groove, and the outer wall of the sealing gasket is slidably connected to the inner wall of the top of the oil cavity. The double seal prevents the leakage of insulating oil and the intrusion of external moisture, reducing the risk of partial discharge.

[0014] (III) Beneficial Effects

[0015] This utility model provides a partial discharge-free test transformer and its winding structure. It has the following features:

[0016] Beneficial effects:

[0017] (i) The circulation device drives the insulating oil through the pump to form a closed loop via the pumping pipe, filter element and spray pipe. The heat dissipation fins on the outer wall of the pumping pipe remove heat from the winding and core, while the filter element continuously filters impurities, maintaining the high insulation performance of the insulating oil, effectively delaying the aging of the insulation material and extending the service life of the equipment.

[0018] (II) The mounting base, through the cooperation of the sealing ring at the bottom of the cover plate and the sealing groove at the top of the mounting base, and the tight contact between the sealing gasket and the inner wall of the oil cavity, effectively isolates external moisture and impurities, greatly reducing the risk of insulation oil deterioration due to moisture. The rubber gasket, as an elastic buffer layer, can absorb the vibration generated by the winding under the action of electromagnetic force, preventing insulation wear. The axial constraint of the mounting bracket on the winding wire avoids electric field distortion caused by winding displacement. The double protection ensures the long-term stability of the insulation structure. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2 This is a schematic diagram of the internal structure of this utility model;

[0021] Figure 3 This is a schematic diagram of the structure of the circulation device of this utility model;

[0022] Figure 4 This is a schematic diagram of the core block of this utility model;

[0023] Figure 5 This is a schematic diagram of the structure of the cover plate of this utility model.

[0024] In the diagram: 1. Mounting base; 11. Oil chamber; 12. Sealing groove; 13. Base; 14. Iron core block; 15. Mounting bracket; 16. Rubber pad; 17. Winding wire; 2. Circulation device; 21. Circulation pump; 22. Spray pipe; 23. Filter element; 24. Liquid extraction pipe; 25. Heat dissipation fins; 3. Cover plate; 31. High-pressure sleeve; 32. Sealing ring; 33. Sealing gasket. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] Please see Figure 1-5 This utility model provides a technical solution: a partial discharge-free test transformer and its winding structure, comprising: a mounting base 1, a circulation device 2 fixedly connected to the inner wall of the side of the mounting base 1, and a cover plate 3 fixedly connected to the outer wall of the top of the mounting base 1 by bolts; an oil cavity 11 is opened in the inner wall of the mounting base 1, a sealing groove 12 is opened in the outer wall of the top of the mounting base 1, a base 13 is fixedly connected to the inner wall of the bottom of the oil cavity 11, an iron core block 14 is fixedly connected to the outer wall of the top of the base 13, a mounting frame 15 is symmetrically fixedly connected to the outer wall of the iron core block 14, a rubber pad 16 is symmetrically fixedly connected to the outer wall of the iron core block 14, and a winding wire 17 is fixedly connected to the outer wall of the rubber pad 16.

[0027] The winding wire 17 is wound and fixed to the outside of the core block 14 by the rubber pad 16. The mounting bracket 15 is symmetrically arranged at the upper and lower ends of the core block 14, and the outer wall of the mounting bracket 15 is in contact with the outer wall of the winding wire 17. The rubber pad 16 serves as an elastic buffer layer to reduce mechanical vibration between the winding and the core, and to avoid insulation wear and partial discharge caused by vibration. The mounting bracket 15 is symmetrically arranged at the upper and lower ends of the core to apply axial constraint to the winding wire 17 and prevent the winding wire 17 from being displaced under the action of electromagnetic force.

[0028] The circulation device 2 includes a circulation pump 21. A spray pipe 22 is fixedly connected to the outer wall of the top of the circulation pump 21 by bolts. A filter element 23 is fixedly connected to the outer wall of the bottom of the circulation pump 21 by bolts. A suction pipe 24 is fixedly connected to the outer wall of the bottom of the filter element 23 by bolts. A heat dissipation fin 25 is fixedly connected to the outer wall of the suction pipe 24.

[0029] The outer wall of the spray pipe 22 is fixedly connected to the inner wall of the top of the mounting base 1. The outer wall of the suction pipe 24 on the side away from the filter element 23 is fixedly connected to the inner wall of the bottom of the mounting base 1. The outer walls of the heat dissipation fins 25 and the circulation pump 21 are fixedly connected to the outer wall of the mounting base 1. After the circulation pump 21 is started, insulating oil is drawn from the bottom of the oil chamber 11 through the suction pipe 24. After impurities are filtered by the filter element 23, the clean insulating oil is sprayed onto the surface of the winding wire 17 through the spray pipe 22. The heat dissipation fins 25 on the outer wall of the suction pipe 24 increase the contact area between the oil and the outside world, and heat exchange is realized simultaneously during the oil circulation process to reduce the oil temperature.

[0030] A high-pressure sleeve 31 is fixedly connected to the inner wall of the top of the cover plate 3, and a sealing ring 32 and a sealing gasket 33 are fixedly connected to the inner wall of the bottom of the cover plate 3.

[0031] The outer wall of the sealing ring 32 is slidably connected to the inner wall of the sealing groove 12, and the outer wall of the sealing gasket 33 is slidably connected to the inner wall of the top of the oil cavity 11. The double seal prevents the leakage of insulating oil and the intrusion of external moisture, reducing the risk of partial discharge.

[0032] When in use, the mounting base 1 forms a sealed space by connecting with the cover plate 3 to prevent the leakage of insulating oil in the oil chamber 11 in the mounting base 1, and the heat is circulated and cooled by the circulation device 2.

[0033] First, insulating oil is poured into the oil cavity 11. The sealing ring 32 at the bottom of the cover plate 3 matches the sealing groove 12 at the top of the mounting base 1. The sealing gasket 33 contacts the inner wall of the oil cavity 11, providing a double seal to prevent leakage of insulating oil and intrusion of external moisture, thus reducing the risk of partial discharge. The core block 14 is installed inside the oil cavity 11 through the base 13. The winding wire 17 is wound around the outside of the core block 14 through the rubber pad 16. The rubber pad 16 serves as an elastic buffer layer to reduce mechanical vibration between the winding and the core, thus avoiding insulation wear and partial discharge caused by vibration. The mounting bracket 15 is symmetrically arranged at the upper and lower ends of the core to apply axial constraints to the winding wire 17, preventing the winding wire 17 from shifting under the action of electromagnetic force and maintaining the uniformity of the electric field distribution.

[0034] After the circulating pump 21 is started, insulating oil is drawn from the bottom of the oil chamber 11 through the suction pipe 24. After impurities are filtered by the filter element 23, the clean insulating oil is sprayed onto the surface of the winding wire 17 through the spray pipe 22. The heat dissipation fins 25 on the outer wall of the suction pipe 24 increase the contact area between the oil and the outside world, and heat exchange is realized simultaneously during the oil circulation process to reduce the oil temperature and maintain its high insulation performance. The high voltage bushing 31 passes through the cover plate 3 and leads the high voltage end of the winding wire 17 to the external test circuit.

[0035] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0036] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A partial discharge-free test transformer and its winding structure, characterized in that, include: Mounting base (1), the inner wall of the side of the mounting base (1) is fixedly connected to a circulation device (2), and the outer wall of the top of the mounting base (1) is fixedly connected to a cover plate (3) by bolts; The inner wall of the mounting base (1) is provided with an oil cavity (11), the outer wall of the top of the mounting base (1) is provided with a sealing groove (12), the inner wall of the bottom of the oil cavity (11) is fixedly connected with a base (13), the outer wall of the top of the base (13) is fixedly connected with an iron core block (14), the outer wall of the iron core block (14) is symmetrically fixedly connected with a mounting bracket (15), the outer wall of the iron core block (14) is symmetrically fixedly connected with a rubber pad (16), and the outer wall of the rubber pad (16) is fixedly connected with a winding wire (17).

2. The partial discharge-free test transformer and its winding structure according to claim 1, characterized in that: The winding wire (17) is wound and fixed to the outside of the core block (14) by a rubber pad (16). The mounting bracket (15) is symmetrically arranged at the upper and lower ends of the core block (14), and the outer wall of the mounting bracket (15) is in contact with the outer wall of the winding wire (17).

3. The partial discharge-free test transformer and its winding structure according to claim 1, characterized in that: The circulation device (2) includes a circulation pump (21), the outer wall of the top of the circulation pump (21) is fixedly connected to a spray pipe (22) by bolts, the outer wall of the bottom of the circulation pump (21) is fixedly connected to a filter element (23) by bolts, the outer wall of the bottom of the filter element (23) is fixedly connected to a suction pipe (24) by bolts, and the outer wall of the suction pipe (24) is fixedly connected to a heat dissipation fin (25).

4. The partial discharge-free test transformer and its winding structure according to claim 3, characterized in that: The outer wall of the spray pipe (22) is fixedly connected to the inner wall of the top of the mounting base (1), the outer wall of the suction pipe (24) away from the filter element (23) is fixedly connected to the inner wall of the bottom of the mounting base (1), and the outer walls of the heat dissipation fins (25) and the circulation pump (21) are fixedly connected to the outer wall of the mounting base (1).

5. The partial discharge-free test transformer and its winding structure according to claim 1, characterized in that: A high-pressure sleeve (31) is fixedly connected to the inner wall of the top of the cover plate (3), and a sealing ring (32) and a sealing gasket (33) are fixedly connected to the inner wall of the bottom of the cover plate (3).

6. The partial discharge-free test transformer and its winding structure according to claim 5, characterized in that: The outer wall of the sealing ring (32) is slidably connected to the inner wall of the sealing groove (12), and the outer wall of the sealing gasket (33) is slidably connected to the inner wall of the top of the oil cavity (11).

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