Novel 35kV transformer body main hollow channel structure

Abstract

The invention discloses a novel 35kV transformer body main hollow channel structure which comprises a high-voltage coil and a low-voltage coil located in the high-voltage coil, and an insulating paper cylinder is arranged between the high-voltage coil and the low-voltage coil. According to the novel 35kV transformer body main hollow channel structure, due to the appearance of the forming angle ring, the mechanical strength of the forming angle ring is very high after the forming angle ring is formed through an insulation paper sizing and washing method, the forming angle ring can be directly wrapped together with an oil gap supporting strip on the outer surface of a low-voltage coil, and meanwhile only one layer of insulation paper cylinder is needed; due to the fact that the forming angle ring is high in mechanical strength, the insulating paper tube can be directly wrapped outside the angle ring, and original multiple layers of oil gap supporting strips are omitted, only two layers of oil gap supporting strips, one layer of insulating paper tube and the forming angle ring on the lower portion of the transformer body are needed between the low-voltage coil and the high-voltage coil, and production cost is well reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of transformer bodies, in particular to a novel 35kV transformer body main air channel structure. Background Art

[0002] With the increasingly fierce competition in the transformer product market, it is particularly important to reduce the design and manufacturing costs of products while ensuring the product performance level. The main air path structure of the 35kV transformer body, the so-called main air path refers to the distance between the low-voltage coil and the high-voltage coil, as shown in the figure, the size of the 22mm space distance, directly affects the transformer operation safety and production cost. With the development and application of new materials, new processes, and new electromagnetic software, in order to reduce product manufacturing costs, seek to improve the main air path structure of the 35kV transformer body. Summary of the Invention

[0003] In view of the shortcomings of the existing technology, the present invention provides a new 35kV transformer body main air channel structure, which solves the problem that if the angle ring at the lower part of the body of the traditional structure is made into a formed angle ring, the production cost of the transformer is very high, and the formed angle ring is very unsuitable for use in a 35kV transformer.

[0004] To achieve the above objectives, the present invention is implemented through the following technical solutions: a new 35kV transformer body main air path structure includes a high-voltage coil and a low-voltage coil located inside the high-voltage coil, an insulating paper tube is arranged between the high-voltage coil and the low-voltage coil, and a number of oil gap support bars are arranged between the high-voltage coil and the low-voltage coil and the insulating paper tube, and a lower body formed angle ring that is compatible with the low-voltage coil is arranged below the high-voltage coil.

[0005] Preferably, a mounting groove is provided on the oil gap support bar, and an arc-shaped bar is provided between the insides of two adjacent mounting grooves.

[0006] Preferably, two groups of limiting holes are provided on the top of the arc-shaped strip, and two groups of mounting holes are provided on the top of the oil gap support strip.

[0007] Preferably, a limiting rod adapted to the limiting hole is slidably connected inside the mounting hole, and one end of two adjacent limiting rods is fixedly connected to a limiting plate.

[0008] Preferably, the top of the limiting plate is rotatably connected to a threaded rod through an opening.

[0009] Preferably, a rotation hole adapted to the threaded rod is provided at the top of the oil gap support bar and located between the two mounting holes.

[0010] Beneficial effects The present invention provides a novel 35kV transformer main air channel structure. Compared with existing technologies, it has the following advantages: (1) This invention is based on the emergence of formed angle rings. The formed angle rings are formed by the insulating pulp washing method and have very high mechanical strength. With the improvement of the mechanical strength of the formed angle rings, the formed angle rings can be directly wrapped with the oil gap support bars on the outer surface of the low-voltage coil, and only one layer of insulating paper tube is required. Due to the high mechanical strength of the formed angle rings and the fact that the insulating paper tube can be directly wrapped around the outside of the angle rings, the original multi-layer oil gap support bars are eliminated, so that only two layers of oil gap support bars, one layer of insulating paper tube and the formed angle ring at the lower part of the device body are required between the low-voltage coil and the high-voltage coil, which greatly reduces the production cost.

[0011] (2) The invention installs arc bars between multiple oil gap stays, so that multiple arc bars are installed between two oil gap stays for reinforcement, and the limiting rod is inserted into the limiting hole through the installation hole, so that the limiting rod can clamp and limit the arc bars in the oil gap stay, which can well limit the multiple oil gap stays, effectively prevent the multiple oil gap stays from displacement, and ensure the use effect of the oil gap stays. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 Schematic diagram of the external structure of the present invention; Figure 2 is a cross-sectional view of the structure of the present invention; Figure 3 This is a schematic structural diagram of the oil gap support bar and the arc bar of the present invention; Figure 4 This is a schematic structural diagram of the oil gap support bar, arc-shaped bar, limiting hole, mounting hole and rotating hole of the present invention; Figure 5 Schematic diagram of the structure of the limiting rod, limiting plate and threaded rod of the present invention; Figure 6 This is a schematic diagram of the internal structure of the oil gap support bar and the installation groove of the present invention.

[0013] In the figure: 1. High-voltage coil; 2. Low-voltage coil; 3. Molded angle ring at the lower part of the device body; 4. Insulating paper tube; 5. Oil gap support bar; 6. Mounting groove; 7. Arc bar; 8. Limiting hole; 9. Mounting hole; 10. Limiting rod; 11. Limiting plate; 12. Threaded rod; 13. Rotating hole. DETAILED DESCRIPTION

[0014] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0015] See also Figure 1-6The present invention provides a technical solution: a new 35kV transformer body main air channel structure, including a high-voltage coil 1 and a low-voltage coil 2 located inside the high-voltage coil 1, an insulating paper tube 4 is arranged between the high-voltage coil 1 and the low-voltage coil 2, and a plurality of oil gap support bars 5 are arranged between the high-voltage coil 1 and the low-voltage coil 2 and the insulating paper tube 4. A lower body forming angle ring 3 adapted to the low-voltage coil 2 is arranged below the high-voltage coil 1. The lower body forming angle ring 3 is formed by an insulating pulp washing method and has very high mechanical strength. Advanced electromagnetic software is used to check whether the electromagnetic field inside the transformer body has changed. After verification, the electromagnetic field has not changed before and after the improvement, meeting the transformer design, quality, and safe operation requirements. After improvement, the main air channel size of the transformer body is 22mm, the distance between the oil gap support bars 5 is changed from 3 groups to 2 groups, and the insulating paper tube 4 is changed from 2 to one, thereby reducing costs.

[0016] Furthermore, in order to facilitate the limiting of multiple oil gap struts 5 and prevent the oil gap struts 5 from being offset, a mounting groove 6 is provided on the oil gap strut 5, and an arc-shaped bar 7 is provided between the insides of two adjacent mounting grooves 6. Two groups of limiting holes 8 are provided on the top of the arc-shaped bar 7, and two groups of mounting holes 9 are provided on the top of the oil gap strut 5. The inside of the mounting hole 9 is slidably connected with a limiting rod 10 adapted to the limiting hole 8, and one end of the two adjacent limiting rods 10 is fixedly connected to the limiting plate 11.

[0017] Furthermore, in order to facilitate the clamping and limiting of the arc bar 7, the top of the limiting plate 11 is rotatably connected to a threaded rod 12 through an opening, and a rotating hole 13 adapted to the threaded rod 12 is opened at the top of the oil gap support bar 5 and located between the two mounting holes 9.

[0018] When in use, the formed angle ring 3 at the lower part of the device body is installed below between the high-voltage coil 1 and the low-voltage coil 2, and multiple groups of arc bars 7 are respectively inserted into the mounting grooves 6 on the two oil gap struts 5, so that multiple arc bars 7 and multiple oil gap struts 5 are assembled to form a ring, and then the limiting rod 10 is inserted into the mounting hole 9, so that the mounting hole 9 is inserted into the limiting hole 8 on the arc bar 7, so that the limiting rod 10 clamps and limits the arc bar 7, and rotates the threaded rod 12 to move downward, and the threaded rod 12 will be inserted into the rotating hole 13, so that the limiting plate 11 is limited on the oil gap strut 5, and then the two groups of oil gap struts 5 are installed between the high-voltage coil 1 and the low-voltage coil 2, and the insulating paper tube 4 is installed between the two groups of oil gap struts 5.

[0019] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0020] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A new type of 35kV transformer main air path structure, comprising a high voltage coil (1) and a low voltage coil (2) located inside the high voltage coil (1), characterized in that: An insulating paper tube (4) is provided between the high-voltage coil (1) and the low-voltage coil (2), and a plurality of oil gap support bars (5) are provided between the high-voltage coil (1) and the low-voltage coil (2) and the insulating paper tube (4). A lower body formed angle ring (3) that matches the low-voltage coil (2) is provided below the high-voltage coil (1).

2. The novel 35kV transformer main air channel structure according to claim 1 is characterized in that: The oil gap support bar (5) is provided with a mounting groove (6), and an arc-shaped bar (7) is provided between two adjacent mounting grooves (6).

3. The novel 35kV transformer main air channel structure according to claim 2 is characterized in that: Two groups of limiting holes (8) are provided at the top of the arc-shaped bar (7), and two groups of mounting holes (9) are provided at the top of the oil gap support bar (5).

4. The novel 35kV transformer main air channel structure according to claim 3 is characterized in that: A limiting rod (10) adapted to the limiting hole (8) is slidably connected inside the mounting hole (9), and one end of two adjacent limiting rods (10) is fixedly connected to a limiting plate (11).

5. The novel 35kV transformer main air channel structure according to claim 4 is characterized in that: The top of the limiting plate (11) is rotatably connected to a threaded rod (12) via an opening.

6. The novel 35kV transformer main air channel structure according to claim 5 is characterized in that: A rotation hole (13) adapted to the threaded rod (12) is provided at the top of the oil gap support bar (5) and located between the two mounting holes (9).

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