A three-column core clamp shielding structure

Abstract

The application discloses a three-column iron core clamp piece shielding structure and relates to the field of transformers, which comprises an oil tank, the inside of the oil tank is provided with iron cores, the iron cores are arranged in three and are uniformly distributed, clamp piece web parts are arranged on the two sides of the iron cores, the clamp piece web parts comprise upper clamp plate webs and lower clamp plate webs, first low-magnetic steel plates and second low-magnetic steel plates are welded to the side of the upper clamp plate webs close to the lower clamp plate webs, and the first low-magnetic steel plates and the second low-magnetic steel plates are respectively located at the two ends of the upper clamp plate webs. The application adopts a group of wide-limb plate shields at the shielding end of the vertically-arranged first limb plate, and the wide-limb plate shield is used at the magnetic flux intersection of the multiple groups of vertically-arranged limb plates. Compared with the two groups of narrow-limb plate shields, the advantage of the wide-limb plate shield lies in that the gap between the limb plate shields is cancelled, and the overheating of the single group of narrow-limb plate shields due to the saturation of the magnetic flux is prevented.

Description

Technical Field

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

[0002] Stray losses are an unavoidable factor in transformer parameters. With the increase in capacity, large-capacity power transformers must implement leakage flux prevention measures to avoid excessive leakage flux passing through magnetically conductive metal structural components, which can lead to increased stray losses and the risk of localized overheating. Therefore, reducing stray losses and preventing structural component overheating is particularly important in transformer design. Clamping plate shielding can provide a high-permeability, low-loss closed path for leakage flux at the winding ends, improving the magnetic field distribution at the winding ends.

[0003] Compared to a three-phase five-limb core transformer, a three-phase three-limb core transformer lacks side columns on both sides of the core. Therefore, the closed path formed by the leakage flux outside the AC phase is more arbitrary. This leakage flux needs to be guided into the AC phase core column to form a loop. Since there is no yoke outside the AC phase, a unidirectional magnetic shielding structure cannot be used to complete the closed path. The leakage flux can only be guided into the core column through a combination of horizontal and vertical magnetic shielding. During the magnetic conduction process, the leakage flux entering the clamp web should be minimized.

[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 purpose of this invention is to provide a three-column iron core clamp shielding structure to solve the problem of the large randomness of the closed path formed by the leakage flux of the iron core outside the AC phase.

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

[0007] Preferably, a plurality of uniformly distributed first limb plate shields are fixedly installed on both the first and second low magnetic steel plates, and a plurality of uniformly distributed second limb plate shields are fixedly installed on both the third and fourth low magnetic steel plates. The plurality of first limb plate shields form a first set of shielding layers, and the plurality of second limb plate shields form a second set of shielding layers. Connectors are provided on opposite sides of the first set of shielding layers and the second set of shielding layers, and the plurality of first limb plate shields and second limb plate shields are fixedly connected to the corresponding connectors.

[0008] Preferably, the outer surfaces of the plurality of iron cores are all wound with a first voltage regulating winding, the outer surfaces of the plurality of iron cores are all wound with a second voltage regulating winding, the outer surfaces of the plurality of iron cores are all wound with a low-voltage winding, and the outer surfaces of the plurality of iron 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, an insulating layer is provided between the first voltage regulating winding and the second voltage regulating winding, an insulating layer is provided between the second voltage regulating winding and the low voltage winding, and an insulating layer is provided between the low voltage winding and the high voltage winding.

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

[0011] Preferably, clamping plates are fixedly installed on each of the plurality of first limb plate shields and second limb plate shields, limb plate reinforcing irons are fixedly installed between each of the plurality of first limb plate shields, and limb plate reinforcing irons are also fixedly installed between each of the plurality of second limb plate shields.

[0012] The technical effects and advantages of this invention are as follows:

[0013] 1. A set of wide-plate shielding is used at the end of the first vertically arranged limb plate shielding. This is the intersection of magnetic flux of multiple sets of vertically arranged limb plate shielding. Compared with two sets of narrow-plate shielding, the advantage of using wide-plate shielding at this point is that it eliminates the gap between the limb plate shielding, preventing the single set of narrow-plate shielding from overheating due to magnetic saturation.

[0014] 2. The first limb plate shield covers most of the leakage magnetic channel between the low-voltage winding and the high-voltage winding, so that the end leakage magnetic flux is absorbed into the first limb plate shield and enters the core to form a closed loop as much as possible. This greatly reduces the possibility of leakage magnetic flux flowing into the clamp web components and oil tank, reduces stray losses, and avoids overheating of the clamp web components. Attached Figure Description

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

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

[0017] Figure 3 This is a top view of the clamping plate shield in this invention.

[0018] In the diagram: 1. Core; 2. First voltage regulating winding; 3. Second voltage regulating winding; 4. Low-voltage winding; 5. High-voltage winding; 6. Clamp web assembly; 7. Clamp leg plate; 8. Leg plate reinforcing iron; 9. First leg plate shield; 10. Oil tank; 61. Upper clamp web plate; 62. First low-magnetic steel plate; 63. Second low-magnetic steel plate; 64. Lower clamp web plate; 65. Third low-magnetic steel plate; 66. Fourth low-magnetic steel plate; 91. Second leg plate shield; 92. Connector. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] This invention provides, for example Figure 1-3 The diagram shows a three-column iron core clamp shielding structure, including an oil tank 10. Inside the oil tank 10 is an iron core 1, which consists of iron core columns and yokes. Three iron cores 1 are evenly distributed. Clamping web components 6 are provided on both sides of the iron core 1. The clamping web components 6 include an upper clamping web 61 and a lower clamping web 64. A first low-magnetic steel plate 62 and a second low-magnetic steel plate 63 are welded to the side of the upper clamping web 61 closest to the lower clamping web 64. The first low-magnetic steel plate 62 and the second low-magnetic steel plate 63 are located at opposite ends of the upper clamping web 61. Multiple evenly distributed first limb shielding plates 9 are fixedly installed on both the first low-magnetic steel plates 62 and 63. The lower clamping web... A third low-magnetic steel plate 65 and a fourth low-magnetic steel plate 66 are welded to the side of the web plate 64 near the upper clamping plate web plate 61. Multiple evenly distributed second limb plate 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 located at the two ends of the lower clamping plate web plate 64, respectively. 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 clamping limb plate 7 and the clamping web plate component 6. Both the clamping limb plate 7 and the limb plate reinforcing iron 8 use low-magnetic steel plates, which increases the magnetic resistance on the path of magnetic flux entering the clamping web plate component 6 and blocks most of the possibility of magnetic flux entering the clamping web plate component 6.

[0021] Clamping plates 7 are fixedly installed on multiple first limb plate shields 9 and second limb plate shields 91. Limb plate reinforcing irons 8 are fixedly installed between multiple first limb plate shields 9 and multiple second limb plate shields 91. The first limb plate shields 9 are arranged perpendicular to the iron cores 1 in the middle between the three iron cores 1. The first limb plate shields 9 are arranged with narrow plates of equal width. The first limb plate shields 9 are arranged in a combination of vertical and parallel methods on the opposite sides of the iron cores 1 on both sides. The first limb plate shields 9 are arranged in a mixed manner of wide and narrow plates.

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

[0023] At the end of the first vertically arranged limb plate shield 9, a set of wide limb plate shields is used. This is the intersection of the magnetic flux of multiple sets of vertically arranged limb plate shields. Compared with two sets of narrow limb plate shields, the advantage of using wide limb plate shields here is that it eliminates the gap between the limb plate shields and prevents the single set of narrow limb plate shields from overheating due to magnetic saturation.

[0024] Multiple first limb plate shields 9 are also fixedly installed on the upper clamping plate web 61, and multiple second limb plate shields 91 are also fixedly installed on the lower clamping plate web 64. One side of the connector 92 is in contact with the outer surface of the corresponding iron core 1, and one side of the connector 92 has an arc that cooperates with the iron core 1.

[0025] Multiple iron cores 1 are each wound with a first voltage regulating winding 2, a second voltage regulating winding 3, a low-voltage winding 4, and 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 insulation layer between the first voltage regulating winding 2 and the second voltage regulating winding 3, there is an insulation layer between the second voltage regulating winding 3 and the low-voltage winding 4, and there is an insulation layer between the low-voltage winding 4 and the high-voltage winding 5.

[0026] The first limb plate shield 9 covers most of the leakage magnetic channel between the low-voltage winding 4 and the high-voltage winding 5, so that as much leakage magnetic flux as possible is drawn into the first limb plate shield 9 and into the core 1 to form a closed loop. This greatly reduces the possibility of leakage magnetic flux flowing into the clamp web component 6 and the oil tank 10, reduces stray losses, and avoids 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: The oil tank (10) is provided with an iron core (1) inside. The iron core (1) is configured as three evenly distributed. The iron core (1) is provided with clamping web plate components (6) on both sides. The clamping web plate component (6) includes an upper clamping web plate (61) and a lower clamping web plate (64). The upper clamping web plate (61) is welded with a first low magnetic steel plate (62) and a second low magnetic steel plate (63) on the side near the lower clamping web plate (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 clamping web plate (61). The lower clamping web plate (64) is welded with a third low magnetic steel plate (65) and a fourth low magnetic steel plate (66) on the side near the upper clamping web plate (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 clamping web plate (64). In this case, multiple uniformly 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), and multiple uniformly distributed second limb plate shields (91) are fixedly installed on the third low magnetic steel plate (65) and the fourth low magnetic steel plate (66). The multiple first limb plate shields (9) form a first set of shielding layers, and the multiple second limb plate shields (91) form a second set of shielding layers. Connectors (92) are provided on the opposite sides of the first set of shielding layers and the second set of shielding layers. The multiple first limb plate shields (9) and the multiple second limb plate shields (91) are fixedly connected to the corresponding connectors (92). Multiple first limb plate shields (9) are also fixedly installed on the upper clamping plate web (61), and multiple second limb plate shields (91) are also fixedly installed on the lower clamping plate web (64). One side of the connector (92) is in contact with the outer surface of the corresponding iron core (1), and one side of the connector (92) has an arc that cooperates with the iron core (1). The width of the connector (92) is greater than the width of the first limb plate shield (9) and the width of the second limb plate shield (91).

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

3. The three-column iron core clamp shielding structure according to claim 2, 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), 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).

4. The three-column iron core clamp shielding structure according to claim 1, characterized in that: Clamping plates (7) are fixedly installed on multiple first limb plate shields (9) and second limb plate shields (91). Limb plate reinforcing irons (8) are fixedly installed between multiple first limb plate shields (9) and multiple second limb plate shields (91).

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