High-capacity transformer high-voltage side magnetic shielding arrangement structure and method

Abstract

The invention relates to a high-voltage side magnetic shielding arrangement structure and method for a high-capacity transformer. The magnetic shielding arrangement structure comprises multiple sets of magnetic shielding assemblies, each magnetic shielding assembly comprises a shielding plate, a supporting and limiting assembly and a fastener, the surface of each supporting and limiting assembly is connected with a clamping mechanism, the shielding plates are arranged on the sides, away from the high-voltage side box wall, of the supporting and limiting assemblies, and the clamping mechanisms clamp the shielding plates to fix the shielding plates. A conduction plate is arranged on the supporting and limiting assembly, and the two corresponding sides of the conduction plate are in contact with the shielding plate and the high-voltage side box wall respectively; according to the magnetic shielding arrangement structure, leakage magnetic flux penetrates through three phases along a specific magnetic loop through transverse magnetic shielding and is guided back to an iron core from the upper end or the lower end of an oil tank, additional loss caused by the leakage magnetic flux is effectively reduced, most of the leakage magnetic flux is fundamentally shielded and isolated from an overheating position, and the local overheating risk is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of transformers, and in particular relates to a magnetic shielding arrangement structure and method for a high-voltage side of a large-capacity transformer. Background Art

[0002] In recent years, the energy efficiency requirements for large-capacity generator transformers have become increasingly higher. Transformers are required to meet requirements such as "energy conservation and emission reduction" in all projects. To achieve these requirements, higher requirements are placed on the transformer space and load performance.

[0003] When a large-capacity three-phase transformer flows through a load current during operation, a leakage magnetic field is generated around the winding. The leakage magnetic flux enters the transformer structural parts, such as the oil tank, core clamps, etc., causing additional losses of the transformer and even local overheating of the structural parts. At present, in order to solve this problem, a magnetic shield is set to absorb the leakage magnetic flux or strengthen the guidance, thereby reducing the loss in the structural parts. Generally, a copper shield is set on the high-voltage side of a large-capacity generator to refract the leakage magnetic flux back to the core, but a copper plate cannot be set on the oil tank at the middle outlet. For the high-voltage side, this results in the copper shield not being very effective in reducing losses, so a structure is designed to solve this problem. Summary of the invention

[0004] The purpose of the present invention is to provide a magnetic shielding arrangement structure with simple structure and reasonable design in order to solve the above problems.

[0005] The present invention achieves the above-mentioned purpose through the following technical solutions:

[0006] On the one hand, the present invention provides a magnetic shielding arrangement structure on the high-voltage side of a large-capacity transformer, comprising multiple groups of magnetic shielding components, wherein the magnetic shielding components include a shielding plate, a support and limit assembly and a fastener, the surface of the support and limit assembly is connected with a clamping mechanism, the shielding plate is arranged on the side of the support and limit assembly away from the high-voltage side box wall, the clamping mechanism clamps the shielding plate to fix the shielding plate, the support and limit assembly is provided with a conduction plate, the corresponding two sides of the conduction plate are respectively in contact with the shielding plate and the high-voltage side box wall, the clamping mechanism is connected with a fixing plate, and the fastener cooperates with the fixing plate to connect the support and limit assembly to the high-voltage side box wall.

[0007] As a further optimization solution of the present invention, the support and limiting assembly includes multiple groups of support plates, the multiple groups of support plates are arranged in a linear array, the shielding plate is arranged perpendicular to the multiple groups of support plates, and the clamping mechanism is connected to the support plates.

[0008] As a further optimization solution of the present invention, mounting holes are provided on the surface of the fixing plate and the high-voltage side box wall, and the fasteners are connected in the mounting holes.

[0009] As a further optimization solution of the present invention, the shielding plate is a silicon steel sheet.

[0010] As a further optimization solution of the present invention, the clamping mechanism and the support plate both have excellent magnetic conductivity.

[0011] As a further optimization solution of the present invention, a plurality of groups of magnetic shielding components are arranged in a straight line, and an insulating layer is arranged between each group of magnetic shielding components.

[0012] As a further optimization solution of the present invention, an elastic member is arranged between the fixing plate and the high-pressure side box wall, and the elastic member is used to absorb vibration.

[0013] As a further optimization solution of the present invention, the elastic member is a rubber gasket, and the rubber gasket is connected to a side of the fixing plate close to the high-voltage side box wall.

[0014] The second aspect of the present invention provides a method for arranging magnetic shielding on the high-voltage side of a large-capacity transformer, and the installation steps are as follows:

[0015] S1. Prepare a horizontally arranged shielding plate;

[0016] S2. Use a clamping mechanism connected to the support plate to clamp and fix the shielding plate;

[0017] S3. Use adhesive to adhere the rubber gasket to the surface of the fixing plate close to the high-voltage side box wall;

[0018] S4. Pass one end of the fastener through the mounting holes of the fixing member and the box wall in turn to complete the connection between the shielding plate and the high-voltage side box wall.

[0019] The beneficial effect of the present invention is that: the present invention uses transverse magnetic shielding to guide the leakage magnetic flux along a specific magnetic circuit, through the three phases, and back to the iron core from the upper or lower end of the oil tank, thereby effectively reducing the additional loss caused by the leakage magnetic flux, fundamentally shielding and isolating most of the leakage magnetic flux from the overheating position, and reducing the risk of local overheating. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the connection between the magnetic shield and the high-voltage side box wall of the present invention;

[0021] Figure 2 This is a schematic diagram of the overall structure of the transverse (phase-to-phase connected) magnetic shield of the present invention.

[0022] Figure 3 The present invention Figure 1 The structural diagram of the part Ⅰ in the middle;

[0023] Figure 4 The present invention Figure 2 Schematic diagram of the structure at the middle II;

[0024] Figure 5 It is a schematic diagram of the direction of the transverse magnetic shielding magnetic circuit of the present invention.

[0025] In the figure: 1. Clamping mechanism; 2. Support plate; 3. Conductive plate; 4. Shielding plate; 5. Elastic member; 6. Fastener; 7. Fixing plate. DETAILED DESCRIPTION

[0026] The present application is further described in detail below in conjunction with the accompanying drawings. It is necessary to point out here that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technical personnel in this field can make some non-essential improvements and adjustments to the present application based on the above application content.

[0027] Embodiment 1

[0028] like Figures 1 to 4 As shown, a magnetic shielding arrangement structure on the high-voltage side of a large-capacity transformer includes multiple groups of magnetic shielding components, wherein the magnetic shielding components include a shielding plate 4, a support and limit assembly and a fastener 6, the surface of the support and limit assembly is connected with a clamping mechanism 1, the shielding plate 4 is arranged on the side of the support and limit assembly away from the high-voltage side box wall, the clamping mechanism 1 clamps the shielding plate 4 to fix the shielding plate 4, the support and limit assembly is provided with a conduction plate 3, the corresponding two sides of the conduction plate 3 are respectively in contact with the shielding plate 4 and the high-voltage side box wall, the clamping mechanism 1 is connected with a fixing plate 7, and the fastener 6 cooperates with the fixing plate 7 to connect the support and limit assembly to the high-voltage side box wall.

[0029] The structure provided by the present invention is aimed at a transformer with a large-capacity three-phase integrated high-voltage outlet as a detachable outlet. A transverse (phase-to-phase connection type) magnetic shield is set on the high-voltage side oil tank, that is, the leakage magnetic flux is passed through the three phases along a specific magnetic circuit through the transverse magnetic shield, and is guided back to the iron core from the upper or lower end of the oil tank. The additional loss caused by the leakage magnetic flux is effectively reduced. At the same time, on the one hand, the eddy current and circulating area caused by the leakage magnetic field are reduced by reducing the introduction cross-section of the silicon steel sheet, so that most of the leakage magnetic flux is fundamentally shielded and isolated from the overheating position, reducing the risk of local overheating. On the other hand, by changing the fixing method of the magnetic shielding plate, the production cost and operating efficiency are greatly improved.

[0030] It should be noted that the magnetic shielding assembly of the present invention is placed above and below the detachable outlet. This shielding assembly is detachable, which can greatly save assembly time compared with the traditional welding type, and also reduces the risk of incomplete cleaning of welding slag after welding.

[0031] Furthermore, the support and limiting assembly includes multiple groups of support plates 2 , the multiple groups of support plates 2 are arranged in a linear array, the shielding plate 4 is arranged perpendicular to the multiple groups of support plates 2 , and the clamping mechanism 1 is connected to the support plates 2 .

[0032] Furthermore, mounting holes are provided on the surface of the fixing plate 7 and the high-voltage side box wall, and the fasteners 6 are connected in the mounting holes.

[0033] Furthermore, the shielding plate 4 is a silicon steel sheet.

[0034] Furthermore, the clamping mechanism 1 and the support plate 2 both have excellent magnetic conductivity.

[0035] The clamping mechanism 1 and the support plate can be made of materials with excellent magnetic conductivity such as iron, silicon steel, nickel-iron alloy, etc.

[0036] In this embodiment, a specific structure of a clamping mechanism 1 is provided. Specifically, the clamping mechanism 1 includes a mounting frame and two sets of correspondingly arranged clamping plates. The two sets of clamping plates are slidably connected to the corresponding sides of the mounting frame. The two sets of clamping plates can be moved and controlled using a double-headed screw to clamp the shielding plate 4.

[0037] It should be noted that the installation frame is a rectangular frame, and a plurality of groups of support plates 2 are connected to the surfaces of the two groups of side edges of the installation frame that are not connected to the clamping plates.

[0038] It should be further explained that the fixing plate 7 is connected to the corresponding two sides of the installation frame.

[0039] Furthermore, the plurality of groups of magnetic shielding components are arranged in a straight line, and an insulating layer is arranged between each group of magnetic shielding components.

[0040] It should be noted that the material of the insulating layer can be fluoroplastic, porcelain, glass fiber, asbestos, etc.

[0041] Furthermore, an elastic member 5 is provided between the fixing plate 7 and the high-voltage side box wall, and the elastic member 5 is used to absorb vibration.

[0042] It should be noted that there are multiple groups of fixing plates 7, and the fixing members 7 are arranged correspondingly thereto. The fixing plates 7 play a limiting role, and cooperate with the fasteners 6 to make the transverse (phase-to-phase connected) magnetic shielding more flat and not bent in the longer length direction when placed.

[0043] Furthermore, the elastic member 5 is a rubber gasket, and the rubber gasket is connected to a side of the fixing plate 7 close to the high-voltage side box wall.

[0044] It should be noted that the elastic member can be used to absorb or reduce the deformation force and vibration transmitted from the tank wall.

[0045] The magnetic shielding of the present invention is evenly distributed above and below the high-voltage outlet line. The magnetic permeability of the silicon steel sheet is much greater than that of ordinary steel, and the leakage magnetic flux will preferentially enter the silicon steel sheet. The leakage magnetic flux of the three phases is balanced in the transverse magnetic shielding and then guides the magnetic flux to be shunted upward and downward and re-enter the iron core. Therefore, silicon steel sheets with better magnetic conductivity are installed on the wall of the oil tank and the direction of the magnetic flux inside is reasonably designed. As a magnetic shield, it is an effective measure to greatly reduce additional losses and reduce local overheating problems.

[0046] Embodiment 2

[0047] A method for arranging magnetic shielding on the high-voltage side of a large-capacity transformer, the steps are as follows:

[0048] S1. Prepare a horizontally arranged shielding plate;

[0049] S2. Use a clamping mechanism connected to the support plate to clamp and fix the shielding plate;

[0050] S3. Use adhesive to adhere the rubber gasket to the surface of the fixing plate close to the high-voltage side box wall;

[0051] S4. Pass one end of the fastener through the mounting holes of the fixing member and the box wall in turn to complete the connection between the shielding plate and the high-voltage side box wall.

[0052] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A magnetic shielding arrangement structure on the high-voltage side of a large-capacity transformer, characterized in that: The invention comprises a plurality of magnetic shielding components, wherein the magnetic shielding components comprise a shielding plate (4), a support and limit assembly and a fastener (6); a surface of the support and limit assembly is connected with a clamping mechanism (1); the shielding plate (4) is arranged on a side of the support and limit assembly away from a high-voltage side box wall; the clamping mechanism (1) clamps the shielding plate (4) to fix the shielding plate (4); a conducting plate (3) is arranged on the support and limit assembly; two corresponding sides of the conducting plate (3) are in contact with the shielding plate (4) and the high-voltage side box wall respectively; a fixing plate (7) is connected to the clamping mechanism (1); and the fastener (6) cooperates with the fixing plate (7) to connect the support and limit assembly to the high-voltage side box wall.

2. A magnetic shielding arrangement structure for high-voltage side of a large-capacity transformer according to claim 1, characterized in that: The support and limiting assembly comprises a plurality of groups of support plates (2), the plurality of groups of support plates (2) being arranged in a linear array, the shielding plates (4) being arranged perpendicular to the plurality of groups of support plates (2), and the clamping mechanism (1) being connected to the support plates (2).

3. A magnetic shielding arrangement structure for high-voltage side of a large-capacity transformer according to claim 1, characterized in that: The surface of the fixing plate (7) and the high-voltage side box wall are both provided with mounting holes, and the fasteners (6) are connected in the mounting holes.

4. A magnetic shielding arrangement structure for high-voltage side of a large-capacity transformer according to claim 1, characterized in that: The shielding plate (4) is a silicon steel sheet.

5. The magnetic shielding arrangement structure of the high-voltage side of a large-capacity transformer according to claim 1 is characterized in that: The clamping mechanism (1) and the support plate (2) both have excellent magnetic conductivity.

6. A magnetic shielding arrangement structure for high-voltage side of a large-capacity transformer according to claim 1, characterized in that: The plurality of groups of magnetic shielding components are arranged in a straight line, and an insulating layer is arranged between each group of magnetic shielding components.

7. A magnetic shielding arrangement structure for high-voltage side of a large-capacity transformer according to claim 1, characterized in that: An elastic member (5) is provided between the fixing plate (7) and the high-pressure side box wall, and the elastic member (5) is used to absorb vibration.

8. A magnetic shielding arrangement structure for high-voltage side of a large-capacity transformer according to claim 7, characterized in that: The elastic member (5) is a rubber gasket, and the rubber gasket is connected to a side of the fixing plate (7) close to the high-voltage side box wall.

9. A method for arranging magnetic shielding on the high-voltage side of a large-capacity transformer, using the magnetic shielding arrangement structure on the high-voltage side of the transformer according to any one of claims 1 to 8, characterized in that: The following steps are included: S1. Prepare a horizontally arranged shielding plate; S2. Use a clamping mechanism connected to the support plate to clamp and fix the shielding plate; S3. Use adhesive to adhere the rubber gasket to the surface of the fixing plate close to the high-voltage side box wall; S4. Pass one end of the fastener through the mounting holes of the fixing member and the box wall in turn to complete the connection between the shielding plate and the high-voltage side box wall.

Images