A rectangular winding amorphous oil transformer structure for resisting short-circuit impact

Abstract

The present invention relates to the technical field of transformers, and in particular to a rectangular winding amorphous oil transformer short-circuit impact resistant structure, including a rectangular winding short-circuit impact resistant structure, an amorphous iron core short-circuit impact resistant structure, and an oil tank body short-circuit impact resistant structure. The rectangular winding short-circuit impact resistant structure is composed of a rectangular winding, a high-voltage conductor, a porous array pre-glued insulation film, and a grid-glued diamond-shaped insulation paper. The porous array pre-glued insulation film is used to enhance the bonding force between the high-voltage conductors and improve the coil strength. The amorphous iron core short-circuit impact resistant structure is composed of a stacked amorphous alloy core and an overlapping inner protective frame. The overlapping inner protective frame is used to alleviate the short-circuit impact borne by the overlapping amorphous iron core. The oil tank body short-circuit impact resistant structure is composed of a heat dissipation corrugated sheet, a steel structure high-temperature curing adhesive sticker, and a box bottom. The high-temperature curing adhesive sticker of the steel structure is used to enhance the welding firmness and mechanical strength between the heat dissipation corrugated sheet and the box bottom.

Description

Technical Field

[0001] The present invention relates to the technical field of transformers, and in particular to a rectangular winding amorphous oil transformer structure for resisting short-circuit impact. Background Art

[0002] As the market's requirements for transformer reliability increase, improving the safety of transformer use has always been the focus of product research and development in the industry.

[0003] Transformer safety primarily depends on its operational reliability. The higher the reliability, the safer the transformer. Transformer reliability has traditionally been verified through short-circuit tests. The primary impact on a transformer during a sudden short circuit is the large short-circuit current, resulting in electrodynamic forces that generate significant kinetic energy, displacement, and deformation in the windings. The high-voltage winding is a multi-turn, multi-layer winding structure, while the low-voltage winding is a single-turn, multi-layer winding structure of copper foil. During a short circuit, the axial and lateral electrodynamic forces induced by the short-circuit current cause the high-voltage winding to expand outward and the low-voltage winding to contract inward. Axially, the inter-turn conductors of the high-voltage winding shift and vibrate. The high-voltage winding conductors, in particular, lack special reinforcement and protection, making them susceptible to inter-turn or inter-layer shorts during a short circuit. Furthermore, the significant deformation of the coil causes the transformer reactance to change beyond the test standard after a short circuit, resulting in test failure. In addition, the deformation, vibration and displacement of the coil winding cause huge physical impact on the iron core, so that the change in the no-load loss of the iron core increases before and after the test. After the test, there are too many amorphous fragments in the box. The changes in the body cause the oil flow to impact the weak parts of the box welding, resulting in oil leakage in the oil tank, which is also an important influencing factor causing the short-circuit test to fail. Summary of the Invention

[0004] In response to the deficiencies of the prior art, the present invention provides a rectangular winding amorphous oil transformer structure for resisting short-circuit impact. This structure can enhance the ability of the rectangular winding amorphous oil transformer to resist short-circuit impact, thereby improving the reliability and safety of the transformer.

[0005] In order to achieve the above object, the technical solutions applied by the present invention are as follows:

[0006] A rectangular winding amorphous oil transformer short-circuit impact resistance structure includes a rectangular winding short-circuit impact resistance structure, an amorphous iron core short-circuit impact resistance structure and an oil tank body short-circuit impact resistance structure. The rectangular winding short-circuit impact resistance structure consists of a rectangular winding, a high-voltage conductor, a porous array pre-glued insulation film and a grid-glued diamond-shaped insulation paper. The amorphous iron core short-circuit impact resistance structure consists of a stacked amorphous alloy core and an overlapping inner protection frame. The oil tank body short-circuit impact resistance structure consists of a body heat dissipation corrugated sheet, a steel structure high-temperature curing adhesive tape and a body bottom.

[0007] Furthermore, the grid-dot glued diamond-shaped insulation paper is wound on the rectangular winding, and the high-voltage wire is wound on the grid-dot glued diamond-shaped insulation paper to form a rectangular high-voltage winding, and a porous array pre-glued insulation film is laid on the outer layer of the single-layer rectangular high-voltage winding.

[0008] Furthermore, the pre-glued surface of the porous array pre-glued insulating film is covered on the outer layer of the single-layer rectangular high-voltage winding, and the mesh-glued diamond-shaped insulating paper is again laid on the outer layer of the porous array pre-glued insulating film, and the laying is repeated until the rectangular high-voltage winding is completed, and the radial size of the rectangular winding is controlled by the mold, and then the surface colloid of the porous array pre-glued insulating film is solidified on the outer layer of the single-layer rectangular high-voltage winding covered by the pre-glued surface of the porous array pre-glued insulating film through high-temperature drying at 130 to 160 degrees.

[0009] Furthermore, the raw material of the porous array pre-glued insulating film is PET or polyester film coated with uncured epoxy resin glue. The thickness of the porous array pre-glued insulating film is 0.08~0.25mm. The surface of the porous array pre-glued insulating film has multiple circular holes evenly distributed in an array form. The aperture of the circular hole is 5mm, and the distance between two adjacent circular holes is greater than or equal to 10mm.

[0010] Furthermore, a single-layer or multi-layer overlapping inner protection frame is provided in the inner window of the stacked amorphous alloy core of the stacked amorphous alloy core. The overlapping inner protection frame is made of silicon steel, stainless steel or aluminum alloy. The thickness of the overlapping inner protection frame is 0.18 to 0.3 mm.

[0011] Furthermore, the left and right extended edges of the overlapping inner protective frame are overlapping closed structures, the width of the overlapping surface is 10 to 40 mm, and the overlapping parts are solidified by welding or pasting, and the length of the welding or pasting is 10 to 30 mm, and the number is 2 to 4.

[0012] Furthermore, the steel structure high temperature curing adhesive tape is arranged between the heat dissipation corrugated sheet of the box body and the bottom of the box body, and the thickness of the steel structure high temperature curing adhesive tape is 0.05 to 1 mm.

[0013] Beneficial effects of the present invention:

[0014] 1) The present invention strengthens the bonding force between the high-voltage winding conductors by reinforcing the surface colloid of the porous pre-glued insulating film, and supplemented by the tensile strength of the film and the insulating paper itself, effectively enhancing the mechanical strength of the winding;

[0015] 2) The porous pre-gelatinized insulating film used in the present invention has an array of holes on its surface. After the high-voltage winding is immersed in oil, the oil can penetrate into the outer insulation layer through the hole array, which is beneficial to enhance the heat dissipation of the winding and improve the insulation performance of the insulating material;

[0016] 3) The present invention effectively enhances the strength of the inner frame of the laminated amorphous alloy core through the overlapping inner protection frame, alleviates the physical damage to the inner frame of the laminated amorphous alloy core caused by short-circuit impact, reduces the shape deformation and performance degradation of the laminated amorphous alloy core, and reduces the precipitation of amorphous core fragments in the box;

[0017] 4) The present invention strengthens the tensile strength and mechanical strength of the box's leak-prone points by curing and reinforcing the box's heat dissipation corrugated sheets and the steel structure between the box bottom with high-temperature curing adhesive tape, thereby reducing box leakage caused by oil flow impact after a short-circuit impact.

[0018] 5) This improves the impact resistance of the rectangular winding amorphous oil transformer and enhances the reliability of the transformer. The present invention is simple to operate, easy to implement, has a wide range of applications, and has obvious effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural diagram of a rectangular winding of the present invention;

[0020] Figure 2 It is a structural diagram of the mold of the present invention;

[0021] Figure 3 This is a diagram of the unclosed structure of the laminated amorphous alloy core of the present invention;

[0022] Figure 4 This is a diagram showing the structure of the laminated amorphous alloy core of the present invention;

[0023] Figure 5 This is a structural diagram of the overlapping inner protection frame of the present invention;

[0024] Figure 6 It is a diagram of the short-circuit impact resistant structure of the oil tank body of the present invention.

[0025] 1. Rectangular winding; 11. High-voltage conductor; 12. Pre-glued porous matrix insulation film; 121. Circular hole; 122. Pre-glued surface of pre-glued porous matrix insulation film; 13. Diamond-shaped insulation paper with dot gluing; 131. Outer layer of single-layer rectangular high-voltage winding; 14. Mold; 16. End width of rectangular winding; 17. Joint of rectangular windings; 2. Laminated amorphous alloy core; 21. Overlapping inner protective frame; 211. Left and right extended edges; 212. Overlapping surface; 213. Overlapping area; 22. Inner window of laminated amorphous alloy core; 3. Heat dissipation corrugated sheet of box body; 4. High-temperature curing adhesive tape for steel structure; 5. Box bottom. DETAILED DESCRIPTION

[0026] The technical solution of the present invention is described below with reference to the accompanying drawings and embodiments.

[0027] like Figures 1 to 6As shown, the rectangular winding amorphous oil transformer short-circuit impact resistance structure described in the present invention includes a rectangular winding short-circuit impact resistance structure, an amorphous iron core short-circuit impact resistance structure, and an oil tank body short-circuit impact resistance structure. The rectangular winding short-circuit impact resistance structure consists of a rectangular winding 1, a high-voltage conductor 11, a porous array pre-glued insulation film 12, and a grid-glued diamond-shaped insulation paper 13. With this structural arrangement, the composite insulation high-voltage winding assembly strength enhancement structure is formed. The porous array pre-glued insulation film 12 enhances the bonding force between the high-voltage conductors 11, thereby improving the coil strength. The amorphous iron core short-circuit impact resistance structure consists of a stacked amorphous alloy core 2 and an overlapping inner protective frame 21. With this structural arrangement, the amorphous iron core short-circuit impact resistance strength enhancement structure is formed. The overlapping inner protective frame 21 mitigates the short-circuit impact borne by the overlapping amorphous iron core. The oil tank body short-circuit impact resistance structure consists of a heat dissipation corrugated sheet 3, a steel structure high-temperature curing adhesive tape 4, and a tank body bottom 5. With such a structural setting, the impact resistance of the box body is improved, and the welding firmness and mechanical strength between the box body heat dissipation corrugated sheet 3 and the box body bottom 5 are enhanced by high-temperature curing adhesive 4 of the steel structure.

[0028] More specifically, the grid-dot glued diamond-shaped insulation paper 13 is wound on the rectangular winding 1, and the high-voltage wire 11 is wound on the grid-dot glued diamond-shaped insulation paper 13 to form a rectangular high-voltage winding, and a porous array pre-glued insulation film 12 is laid on the single-layer rectangular high-voltage winding outer layer 131 of the rectangular high-voltage winding.

[0029] More specifically, the pre-glued surface 122 of the porous array pre-glued insulating film 12 is covered on the outer layer 131 of the single-layer rectangular high-voltage winding. A grid-shaped insulating paper 13 with a glued surface is again applied to the outer layer of the porous array pre-glued insulating film 12. This application is repeated until the rectangular high-voltage winding is completed. The film is then radially pressed through a mold 14 to control the radial dimensions of the rectangular winding. The film is then dried at a high temperature of 130 to 160 degrees to solidify the surface colloid of the porous array pre-glued insulating film 12 onto the outer layer 131 of the single-layer rectangular high-voltage winding covered by the pre-glued surface 122 of the porous array pre-glued insulating film. With this structural arrangement, the mechanical strength of the rectangular winding 1 can be improved after the entire winding 1 is cooled and solidified.

[0030] More specifically, the raw material of the porous array pre-glued insulating film 12 is PET or polyester film coated with uncured epoxy resin glue, the thickness of the porous array pre-glued insulating film 12 is 0.08~0.25mm, and the surface of the porous array pre-glued insulating film 12 is evenly distributed with multiple circular holes 121 in an array form, the aperture of the circular hole 121 is 5mm, and the distance between two adjacent circular holes 121 is greater than or equal to 10mm.

[0031] More specifically, a single-layer or multi-layer overlapping inner protective frame 21 is installed within the inner window 22 of the laminated amorphous alloy core 2. Depending on the transformer capacity, one to five layers of overlapping inner protective frames 21 are welded and overlapped, arranged from the inside out. The overlapping inner protective frames 21 are made of silicon steel, stainless steel, or aluminum alloy, and have a thickness of 0.18 to 0.3 mm.

[0032] More specifically, the left and right extended edges 211 of the overlapping inner protective frame 21 are overlapping and closed. The width of the overlapping surface 212 is 10 to 40 mm. The overlapping points 213 are welded or glued together, with a length of 10 to 30 mm and two to four overlapped points. The overlapping inner protective frame 21 is installed within the window 22 of the laminated amorphous alloy core and simultaneously closes to the rectangular winding end width 16 of the rectangular winding 1 along with the laminated amorphous alloy core 2. Alternatively, it is installed at the rectangular winding joint 17 of the rectangular winding 1, closing to the rectangular winding end width 16 layer by layer.

[0033] More specifically, the steel structure high-temperature curing adhesive tape 4 is positioned between the heat dissipation corrugated sheet 3 and the box bottom 5. The thickness of the steel structure high-temperature curing adhesive tape 4 is 0.05 to 1 mm. The steel structure high-temperature curing adhesive tape 4 cures at high temperatures, increasing the mechanical strength between the heat dissipation corrugated sheet 3 and the box bottom 5 by utilizing the high temperature generated by the steel plate during welding. The heat-resistant temperature of the steel structure high-temperature curing adhesive tape 4 is between 800 and 1000 degrees Celsius.

[0034] The following table shows the third-party measured values ​​of the peak current during the transformer short-circuit test in the embodiment:

[0035]

[0036] The following table shows the third-party measured values ​​of the reactance change after the transformer short-circuit test in the embodiment:

[0037]

[0038] The following table shows the third-party measured values ​​of the no-load loss change after the transformer short-circuit test in the embodiment:

[0039]

[0040] The above describes the technical solutions in the embodiments of the present invention, but the present invention is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the present invention and the claims, all of which fall within the scope of protection of the present invention.

Claims

1. A rectangular winding amorphous oil transformer structure for resisting short-circuit impact, characterized by: The invention comprises a rectangular winding short-circuit impact resistant structure, an amorphous iron core short-circuit impact resistant structure and an oil tank body short-circuit impact resistant structure, wherein the rectangular winding short-circuit impact resistant structure is composed of a rectangular winding (1), a high-voltage conductor (11), a porous array pre-glued insulating film (12) and a grid-glued diamond-shaped insulating paper (13); the amorphous iron core short-circuit impact resistant structure is composed of a laminated amorphous alloy iron core (2) and an overlapping inner protection frame (21); and the oil tank body short-circuit impact resistant structure is composed of a body heat dissipation corrugated sheet (3), a steel structure high-temperature curing adhesive tape (4) and a body bottom (5); The grid-dot glued diamond-shaped insulation paper (13) is wound on the rectangular winding (1), the high-voltage wire (11) is wound on the grid-dot glued diamond-shaped insulation paper (13) to form a rectangular high-voltage winding, and a porous array pre-glue insulation film (12) is laid on the outer layer (131) of the single-layer rectangular high-voltage winding of the rectangular high-voltage winding; The pre-glued surface (122) of the porous array pre-glued insulation film (12) is covered on the outer layer (131) of the single-layer rectangular high-voltage winding, and the mesh-glued diamond-shaped insulation paper (13) is again laid on the outer layer of the porous array pre-glued insulation film (12), and the laying is repeated until the rectangular high-voltage winding is completed, and the radial pressing is performed through the mold (14) to control the radial size of the rectangular winding, and then the surface colloid of the porous array pre-glued insulation film (12) is solidified on the outer layer (131) of the single-layer rectangular high-voltage winding covered by the pre-glued surface (122) of the porous array pre-glued insulation film through high-temperature drying at 130 degrees to 160 degrees; The raw material of the porous array pre-glued insulating film (12) is PET or polyester film coated with uncured epoxy resin glue, the thickness of the porous array pre-glued insulating film (12) is 0.08-0.25 mm, and a plurality of circular holes (121) are evenly distributed in an array on the surface of the porous array pre-glued insulating film (12), the aperture of the circular holes (121) is 5 mm, and the distance between two adjacent circular holes (121) is greater than or equal to 10 mm; A single-layer or multi-layer overlapping inner protection frame (21) is provided in the inner window (22) of the laminated amorphous alloy core (2), wherein the overlapping inner protection frame (21) is made of silicon steel, stainless steel or aluminum alloy, and has a thickness of 0.18-0.3 mm; The left and right extended edges (211) of the overlapping inner protection frame (21) are overlapping closed structures, the width of the overlapping surface (212) is 10-40 mm, and the overlapping portion (213) is solidified by welding or pasting, and the length of the welding or pasting is 10-30 mm, and the number of the overlapping portions is 2-4; The steel structure high temperature curing adhesive tape (4) is arranged between the box body heat dissipation corrugated sheet (3) and the box body bottom (5), and the thickness of the steel structure high temperature curing adhesive tape (4) is 0.05-1 mm.

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