Three-column iron core clamp shielding structure

Abstract

The invention discloses a three-column iron core clamp shielding structure, and relates to the field of transformers, the three-column iron core clamp shielding structure comprises an oil tank, iron cores are arranged in the oil tank, the number of the iron cores is three, the two sides of each iron core are each provided with a clamp web component, and each clamp web component comprises an upper clamping plate web and a lower clamping plate web; a first low-magnetism steel plate and a second low-magnetism steel plate are welded to the side, close to the lower clamping plate web, of the upper clamping plate web, and the first low-magnetism steel plate and the second low-magnetism steel plate are located at the two ends of the upper clamping plate web correspondingly. Compared with two groups of narrow-sheet limb plate shields, the wide-sheet limb plate shield adopted at the position has the advantages that gaps between the limb plate shields are eliminated, and overheating caused by saturation of magnetism passing through a single group of narrow-sheet limb plate shields is prevented.

Description

Technical Field

[0001] The present invention relates to the field of transformers, and in particular to a three-column iron core clamp shielding structure. Background Art

[0002] Stray losses are an unavoidable factor in transformer parameters. As the capacity of large-capacity power transformers increases, magnetic flux leakage must be prevented to avoid the risk of excessive leakage flux closing through magnetically conductive metal components, which increases stray losses and leads to localized overheating. Therefore, reducing stray losses and avoiding overheating of components is particularly important in transformer design. Clamp-on shielding provides a highly permeable, low-loss closed path for leakage flux at the winding ends, improving magnetic field distribution at the winding ends.

[0003] Compared with the three-phase five-leg iron core transformer, the three-phase three-leg iron core transformer does not have side legs on both sides. Therefore, the closed path formed by the leakage flux of the three-leg iron core on the outside of the AC phase is more arbitrary. This part of the leakage flux needs to be introduced into the AC phase iron core leg to form a loop. There is no iron yoke on the outside of the AC phase, and the unidirectional magnetic shielding structure cannot be used to complete the closed path. The leakage flux can only be introduced into the iron core leg through the magnetic shielding in the horizontal and vertical directions. In the process of magnetic conduction, the leakage flux must be minimized from entering the web of the clamp.

[0004] Therefore, it is necessary to propose a three-column iron core clamp shielding structure to solve the above problems. Summary of the Invention

[0005] The object of the present invention is to provide a three-column iron core clamp shielding structure to solve the problem that the closed path formed by the leakage magnetic flux of the iron core outside the AC phase is relatively random.

[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a three-column iron core clamp shielding structure, comprising an oil tank, an iron core is provided inside the oil tank, the iron cores are arranged to be three evenly distributed, and clamp web components are provided on both sides of the iron core, the clamp web components include an upper clamp web and a lower clamp web, a first low-magnetic steel plate and a second low-magnetic steel plate are welded on the side of the upper clamp web close to the lower clamp web, the first low-magnetic steel plate and the second low-magnetic steel plate are respectively located at the two ends of the upper clamp web, a third low-magnetic steel plate and a fourth low-magnetic steel plate are welded on the side of the lower clamp web close to the upper clamp web, the third low-magnetic steel plate and the fourth low-magnetic steel plate are respectively located at the two ends of the lower clamp web.

[0007] Preferably, the first low-magnetic steel plate and the second low-magnetic steel plate are both fixedly mounted with a plurality of evenly distributed first limb plate shields, the third low-magnetic steel plate and the fourth low-magnetic steel plate are both fixedly mounted with a plurality of evenly distributed second limb plate shields, the plurality of first limb plate shields form a first group of shielding layers, the plurality of second limb plate shields form a second group of shielding layers, the opposite sides of the first group of shielding layers and the second group of shielding layers are both provided with connecting pieces, and the plurality of the first limb plate shields and the second limb plate shields are all fixedly connected to the corresponding connecting pieces.

[0008] Preferably, the outside of multiple cores are all wound with a first voltage regulating winding, the outside of multiple cores are all wound with a second voltage regulating winding, the outside of multiple cores are all wound with a low voltage winding, and the outside of multiple cores are all wound with a high voltage winding.

[0009] Preferably, the first voltage regulating winding is located inside the second voltage regulating winding, the second voltage regulating winding is located inside the low-voltage winding, there is an insulating layer between the first voltage regulating winding and the second voltage regulating winding, there is an insulating layer between the second voltage regulating winding and the low-voltage winding, and there is an insulating layer between the low-voltage winding and the high-voltage winding.

[0010] Preferably, a plurality of first limb shields are also fixedly mounted on the upper splint web, and a plurality of second limb shields are also fixedly mounted on the lower splint web. One side of the connector is in contact with the corresponding outer surface of the iron core, and one side of the connector has an arc for use with the iron core.

[0011] Preferably, a plurality of the first limb shields and the second limb shields are fixedly mounted with clamp limbs, a plurality of the first limb shields are fixedly mounted with limb reinforcement irons, and a plurality of the second limb shields are also fixedly mounted with limb reinforcement irons.

[0012] Technical effects and advantages of the present invention:

[0013] 1. A set of wide limb shields is used at the end of the first vertically arranged limb shield. This is where the magnetic flux of multiple vertically arranged limb shields intersects. Compared with two sets of narrow limb shields, the advantage of using wide limb shields here is that the gap between the limb shields is eliminated, preventing a single set of narrow limb shields from overheating due to saturation of magnetic flux.

[0014] 2. The first limb shield covers most of the leakage magnetic air path between the low-voltage winding and the high-voltage winding, so that as much of the end leakage magnetic flux as possible is absorbed into the first limb shield and enters the iron core to form a closed loop, which greatly reduces the possibility of leakage magnetic flux flowing into the clamp web component and the oil tank, reduces stray losses, and avoids overheating of the clamp web component. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1It is a top view of the three-column iron core clamp shielding structure of the present invention.

[0016] Figure 2 It is a side view of the three-column iron core clamp shielding structure of the present invention.

[0017] Figure 3 It is a top view of the shielding of the limb plate of the clamp in the present invention.

[0018] In the figure: 1. iron core; 2. first voltage regulating winding; 3. second voltage regulating winding; 4. low-voltage winding; 5. high-voltage winding; 6. clamp web component; 7. clamp limb; 8. limb reinforcement iron; 9. first limb shield; 10. oil tank; 61. upper clamp web; 62. first low-magnetic steel plate; 63. second low-magnetic steel plate; 64. lower clamp web; 65. third low-magnetic steel plate; 66. fourth low-magnetic steel plate; 91. second limb shield; 92. connector. DETAILED DESCRIPTION

[0019] 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.

[0020] The present invention provides Figure 1-3 A three-column iron core clamp shielding structure shown includes an oil tank 10, an iron core 1 is provided inside the oil tank 10, the iron core 1 is composed of an iron core column and an iron yoke, the iron core 1 is arranged to be evenly distributed, and a clamp web component 6 is provided on both sides of the iron core 1, the clamp web component 6 includes an upper clamp web 61 and a lower clamp web 64, a first low-magnetic steel plate 62 and a second low-magnetic steel plate 63 are welded to one side of the upper clamp web 61 close to the lower clamp web 64, the first low-magnetic steel plate 62 and the second low-magnetic steel plate 63 are respectively located at the two ends of the upper clamp web 61, and a plurality of evenly distributed first limb plate shields 9 are fixedly installed on the first low-magnetic steel plate 62 and the second low-magnetic steel plate 63. A third low magnetic steel plate 65 and a fourth low magnetic steel plate 66 are welded to one side of the web 64 close to the upper clamp web 61, and a plurality of evenly distributed second limb shields 91 are fixedly installed on the third low magnetic steel plate 65 and the fourth low magnetic steel plate 66. The third low magnetic steel plate 65 and the fourth low magnetic steel plate 66 are respectively located at the two ends of the lower clamp web 64. The low magnetic steel plates can block the magnetic flux generated by the wire group. The use of local low magnetic steel plates increases the distance between the clamp limb 7 and the clamp web part 6. The clamp limb 7 and the limb reinforcement iron 8 both use low magnetic steel plates, which increases the magnetic resistance on the path of the magnetic flux entering the clamp web part 6, blocking the possibility of most of the magnetic flux entering the clamp web part 6.

[0021] Multiple first limb plate shields 9 and second limb plate shields 91 are fixedly installed with clamp limb plates 7, multiple first limb plate shields 9 are fixedly installed with limb plate reinforcement irons 8, multiple second limb plate shields 91 are also fixedly installed with limb plate reinforcement irons 8, the first limb plate shields 9 are arranged perpendicular to the iron cores 1 between the three iron cores 1, the first limb plate shields 9 are arranged with narrow pieces of equal width, the first limb plate shields 9 are arranged in a combination of vertical and parallel ways on the opposite sides of the iron cores 1, and the first limb plate shields 9 are arranged in a mixed manner of wide and narrow pieces.

[0022] Multiple first limb shields 9 form a first group of shielding layers, and multiple second limb shields 91 form a second group of shielding layers. Connectors 92 are provided on opposite sides of the first and second groups of shielding layers, and multiple first limb shields 9 and second limb shields 91 are fixedly connected to corresponding connectors 92.

[0023] A group of wide-piece limb shields are used at the end of the vertically arranged first limb shield 9. This is the intersection of the magnetic flux of multiple groups of vertically arranged limb shields. Compared with two groups of narrow-piece limb shields, the advantage of using wide-piece limb shields here is that the gap between the limb shields is eliminated, preventing a single group of narrow-piece limb shields from overheating due to magnetic saturation.

[0024] A plurality of first limb shields 9 are also fixedly mounted on the upper splint web 61, and a plurality of second limb shields 91 are also fixedly mounted on the lower splint web 64. One side of the connecting piece 92 is in contact with the outer surface of the corresponding iron core 1, and one side of the connecting piece 92 has an arc for use with the iron core 1.

[0025] The outside of multiple iron cores 1 is wound with a first voltage regulating winding 2, the outside of multiple iron cores 1 is wound with a second voltage regulating winding 3, the outside of multiple iron cores 1 is wound with a low-voltage winding 4, the outside of multiple iron cores 1 is wound with a high-voltage winding 5, the first voltage regulating winding 2 is located inside the second voltage regulating winding 3, the second voltage regulating winding 3 is located inside the low-voltage winding 4, there is an insulating layer between the first voltage regulating winding 2 and the second voltage regulating winding 3, there is an insulating layer between the second voltage regulating winding 3 and the low-voltage winding 4, and there is an insulating layer between the low-voltage winding 4 and the high-voltage winding 5.

[0026] The first limb shield 9 covers most of the leakage magnetic path between the low-voltage winding 4 and the high-voltage winding 5, so that as much end leakage magnetic flux as possible is absorbed into the first limb shield 9 and enters the iron core 1 to form a closed loop, greatly reducing the possibility of leakage magnetic flux flowing into the clamp web component 6 and the oil tank 10, reducing stray losses, and avoiding overheating of the clamp web component 6.

Claims

1. A three-column iron core clamp shielding structure, comprising an oil tank (10), characterized in that: An iron core (1) is provided inside the oil tank (10), and the iron cores (1) are arranged to be evenly distributed in three pieces. A clamp web component (6) is provided on both sides of the iron core (1), and the clamp web component (6) includes an upper clamp web (61) and a lower clamp web (64). A first low-magnetic steel plate (62) and a second low-magnetic steel plate (63) are welded on one side of the upper clamp web (61) close to the lower clamp web (64). The first low-magnetic steel plate (62) and the second low-magnetic steel plate (63) are respectively located at the two ends of the upper clamp web (61). A third low-magnetic steel plate (65) and a fourth low-magnetic steel plate (66) are welded on one side of the lower clamp web (64) close to the upper clamp web (61). The third low-magnetic steel plate (65) and the fourth low-magnetic steel plate (66) are respectively located at the two ends of the lower clamp web (64).

2. The three-column iron core clamp shielding structure according to claim 1, characterized in that: A plurality of evenly distributed first limb shields (9) are fixedly mounted on the first low-magnetic steel plate (62) and the second low-magnetic steel plate (63), and a plurality of evenly distributed second limb shields (91) are fixedly mounted on the third low-magnetic steel plate (65) and the fourth low-magnetic steel plate (66). The plurality of first limb shields (9) form a first group of shielding layers, and the plurality of second limb shields (91) form a second group of shielding layers. Connectors (92) are provided on opposite sides of the first group of shielding layers and the second group of shielding layers, and the plurality of first limb shields (9) and second limb shields (91) are fixedly connected to the corresponding connectors (92).

3. The three-column iron core clamp shielding structure according to claim 1, characterized in that: The outsides of the plurality of iron cores (1) are all wound with a first voltage regulating winding (2), the outsides of the plurality of iron cores (1) are all wound with a second voltage regulating winding (3), the outsides of the plurality of iron cores (1) are all wound with a low-voltage winding (4), and the outsides of the plurality of iron cores (1) are all wound with a high-voltage winding (5).

4. The three-column iron core clamp shielding structure according to claim 3, characterized in that: The first voltage regulating winding (2) is located inside the second voltage regulating winding (3), the second voltage regulating winding (3) is located inside the low-voltage winding (4), an insulating layer is provided between the first voltage regulating winding (2) and the second voltage regulating winding (3), an insulating layer is provided between the second voltage regulating winding (3) and the low-voltage winding (4), and an insulating layer is provided between the low-voltage winding (4) and the high-voltage winding (5).

5. The three-column iron core clamp shielding structure according to claim 2, characterized in that: A plurality of first limb shields (9) are also fixedly mounted on the upper splint web (61), and a plurality of second limb shields (91) are also fixedly mounted on the lower splint web (64). One side of the connecting piece (92) is in contact with the outer surface of the corresponding iron core (1), and one side of the connecting piece (92) has an arc for use with the iron core (1).

6. The three-column iron core clamp shielding structure according to claim 2, characterized in that: A clamping limb plate (7) is fixedly mounted on each of the plurality of first limb plate shields (9) and the second limb plate shields (91); a limb plate reinforcement iron (8) is fixedly mounted between each of the plurality of first limb plate shields (9); and a limb plate reinforcement iron (8) is also fixedly mounted between each of the plurality of second limb plate shields (91).

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