Transverse magnetic shielding structure and method for alternated arrangement of generator transformers

Abstract

The invention relates to a generator transformer interphase arrangement transverse magnetic shielding structure and method. The magnetic shielding structure comprises a magnetic shielding assembly, the magnetic shielding assembly is installed on a magnetic conductive base and arranged between two sets of iron core columns, the magnetic shielding assembly comprises a silicon steel sheet combination block, a clamping module, a fixing module and a locking module, the clamping module is connected to the surface of the silicon steel sheet combination block, and the fixing module is connected to the surface of the silicon steel sheet combination block. A mounting groove is formed in the surface of the fixing module, the silicon steel sheet combination block is placed in the mounting groove, the locking module is connected to the side edge of the fixing module through a connecting piece so as to clamp the silicon steel sheet combination block in the mounting groove, and the fixing module is connected to the surface of the magnetic conductive base; according to the magnetic shielding structure, the detachable modular design is adopted, all modules are matched with one another, the magnetic shielding assembly is manufactured through the connecting pieces, the magnetic shielding assembly and the transformer body are fixed together, the overall structural design is simple, the manufacturing cost is low, and mounting and dismounting are convenient.

Description

Technical Field

[0001] The invention belongs to the technical field of transformer manufacturing, and particularly relates to a transverse magnetic shielding structure and method arranged between phases of a generator transformer. Background Art

[0002] In recent years, there have been increasingly high requirements for the energy efficiency level of generator transformers of million-kilowatt units. In projects, it is required that transformers need to meet requirements such as "optimal indicators, lowest comparable cost, and meeting first-level energy efficiency". To achieve these requirements, for large-capacity transformers, only the load loss can be controlled well. When a load current flows through a power transformer during operation, a leakage magnetic field is generated around the winding. The leakage magnetic flux enters transformer structural components such as the oil tank and the core clamping parts, which can cause local overheating of individual structural components, thus generating excessive eddy current losses and local overheating problems.

[0003] Currently, to solve the above problems, magnetic shielding is usually set up to suck in the leakage magnetic flux, thereby reducing losses. Generally, the magnetic shielding structures include plate-type magnetic shielding, lobe magnetic shielding, and rectangular magnetic shielding. However, the manufacturing processes of these magnetic shieldings are complex, the finished product prices are high, and their practicability is not strong, which is not conducive to the upper and lower wire outlets of the winding. Therefore, a magnetic shielding structure is designed to solve this problem. Summary of the Invention

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

[0005] The invention realizes the above purpose through the following technical solutions:

[0006] In a first aspect of the invention, a transverse magnetic shielding structure arranged between phases of a generator transformer is provided, which includes a magnetic shielding assembly. The magnetic shielding assembly is installed on a magnetic conduction base and is arranged between two core columns. The magnetic shielding assembly includes a silicon steel sheet combination block, a clamping module, a fixing module, and a locking module. The clamping module is connected to the surface of the silicon steel sheet combination block. An installation groove is formed on the surface of the fixing module. The silicon steel sheet combination block is placed in the installation groove. The locking module is connected to the side of the fixing module through a connecting piece to clamp the silicon steel sheet combination block in the installation groove. The fixing module is placed on the surface of the magnetic conduction base.

[0007] As a further optimized scheme of the invention, the clamping module includes an upper clamping module and a lower clamping module, which are respectively connected to the upper and lower side surfaces of the silicon steel sheet combination block through connecting pieces.

[0008] As a further optimized scheme of the invention, the fixing module includes a first fixing module and a second fixing module. The two ends of the silicon steel sheet combination block are respectively placed in the installation grooves formed in the first fixing module and the second fixing module.

[0009] As a further optimized solution of the present invention, the locking module includes a first locking module and a second locking module, which are respectively connected to the sides of the first fixing module and the second fixing module.

[0010] As a further optimized solution of the present invention, the magnetic conductive base includes a first magnetic conductive base and a second magnetic conductive base, and the first fixing module and the second fixing module are respectively connected to the surfaces of the first magnetic conductive base and the second magnetic conductive base.

[0011] As a further optimized solution of the present invention, the fixing module is connected to the pressing plate through a fitting piece.

[0012] As a further optimized solution of the present invention, the outer layer of the magnetic shielding assembly is wrapped with an insulating material to insulate it from the iron parts, so as to connect the magnetic circuits between phases.

[0013] As a further optimized solution of the present invention, the connecting piece is a plug pin or a screw.

[0014] The second aspect of the present invention provides an installation method for horizontally arranging magnetic shielding between phases of a generator transformer, and the steps are as follows:

[0015] S1. Place the silicon steel sheet combined block between the upper clamping module and the lower clamping module, and connect it with a connecting piece to form a first combined component;

[0016] S2. Place the first combined component in the installation grooves of the first fixing module and the second fixing module;

[0017] S3. Use the connecting piece to connect the first locking module and the second locking module to the sides of the first fixing module and the second fixing module correspondingly;

[0018] S4. Place the first fixing module and the second fixing module on the first magnetic conductive base and the second magnetic base correspondingly, and use the fitting piece to connect the fixing module to the pressing plate.

[0019] The beneficial effects of the present invention are as follows: The present invention adopts a detachable modular design, and through the mutual cooperation of each module, a magnetic shielding combined component is made by using the connecting piece, so that it is fixed together with the transformer body. The overall structural design is relatively simple, the manufacturing cost is low, and it is also convenient for installation and disassembly. Description of the Drawings

[0020] Figure 1 It is a schematic diagram of the overall magnetic shielding structure of the present invention;

[0021] Figure 2 It is a schematic diagram of the magnetic shielding installation of the present invention;

[0022] Figure 3Exploded view of magnetic shielding disassembly of the present invention;

[0023] Figure 4 It is a schematic diagram of the existing plate-type magnetic shielding structure;

[0024] Figure 5 It is a schematic diagram of the existing magnetic shielding structure of the lung lobe;

[0025] Figure 6 It is a schematic diagram of the existing rectangular magnetic shielding structure.

[0026] In the figure: 1. silicon steel sheet combination block; 2. upper clamping module; 3. lower clamping module; 4. second fixing module; 5. first fixing module; 6. first locking module; 7. second locking module; 8. second magnetic conduction base; 9. first magnetic conduction base; 10. connecting piece; 11. fitting piece; 12. iron core column; 13. magnetic shielding assembly; 14. pressing plate. Detailed implementation manners

[0027] The following further describes the present application in detail with reference to the accompanying drawings. It is necessary to point out here that the following specific implementation manners are only used to further illustrate the present application and cannot be construed as limiting the protection scope of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0028] Embodiment 1

[0029] As Figures 1 to 3 shown, a transverse magnetic shielding structure is arranged between the phases of a generator transformer, including a magnetic shielding assembly 13. The magnetic shielding assembly 13 is installed on a magnetic conduction base and is arranged between two groups of iron core columns 12 (the current magnetic shielding is usually arranged around the outside of the iron core column. Specifically, reference can be made to Figures 4 to 6 ). The magnetic shielding assembly 13 includes a silicon steel sheet combination block 1, a clamping module, a fixing module, and a locking module. The clamping module is connected to the surface of the silicon steel sheet combination block 1. An installation groove is provided on the surface of the fixing module. The silicon steel sheet combination block 1 is placed in the installation groove. The locking module is connected to the side of the fixing module through a connecting piece 10 to clamp the silicon steel sheet combination block 1 in the installation groove. The fixing module is installed on the surface of the magnetic conduction base.

[0030] It should be noted that for the characteristics of large leakage magnetic flux at the ends of the windings of ultra-high voltage transformers, in order to ensure that no overheating phenomenon occurs in the iron core clamping part area, magnetic shielding is arranged between the phases to introduce the leakage magnetic flux into the main column, thereby avoiding too concentrated local field strength. At the same time, the fixing method of the magnetic shielding is optimized, which not only ensures the reliability in terms of insulation but also meets the characteristics of large vibration inside large-capacity generator transformers.

[0031] It should be further noted that in this embodiment, the shape of the magnetic shield can be rectangular or irregular.

[0032] Furthermore, the clamping module includes an upper clamping module 2 and a lower clamping module 3, which are respectively connected to the upper and lower side surfaces of the silicon steel sheet assembly block 1 through a connecting member 10.

[0033] Furthermore, the fixing module includes a first fixing module 5 and a second fixing module 4, and both ends of the silicon steel sheet assembly block 1 are respectively placed in the installation grooves formed in the first fixing module 5 and the second fixing module 4.

[0034] Furthermore, the locking module includes a first locking module 6 and a second locking module 7, which are respectively connected to the sides of the first fixing module 5 and the second fixing module 4.

[0035] Furthermore, the magnetic conduction base includes a first magnetic conduction base 9 and a second magnetic conduction base 8, and the first fixing module 5 and the second fixing module 4 are respectively connected to the surfaces of the first magnetic conduction base 9 and the second magnetic conduction base 8.

[0036] Furthermore, the fixing module is connected to the pressing plate 14 through a fitting member 11.

[0037] Furthermore, the outer layer of the magnetic shield assembly 13 is wrapped with an insulating material to insulate it from the iron parts, so as to connect the magnetic circuits between phases.

[0038] Furthermore, the connecting member 10 is a plug or a screw.

[0039] It should be noted that in the present invention, through the mutual cooperation of each module, a magnetic shield assembly 13 is made by using the connecting member, and then it is fixed together with the transformer body. The magnetic shield assembly 13 is firmly fixed by the gravity or pressing force of the body itself, avoiding the risk of falling off due to vibration. In addition, a fitting member is provided on the assembly, and the magnetic shield assembly 13 and the pressing plate 14 of the body are assembled into a whole through the fitting member 11. This further reduces the risk of falling off.

[0040] The principle of setting the magnetic shield of the present invention is as follows: combining the functions of the clamp magnetic shield or the lobe magnetic shield, and extending it to the magnetic circuit connection between phases. Since placing magnetic shields between phases has a greater impact on the structure of the entire transformer, the present invention sets it as a post-installation type, that is, the magnetic shield assembly 13 is installed after other processes are completed. And the magnetic shield structure is set as a detachable type, which greatly saves the assembly time. At the same time, in order to ensure the installation strength and simplicity, the present invention sets the shield as a modular assembly structure.

[0041] Embodiment 2

[0042] An installation method for laterally arranging magnetic shielding between phases of a generator transformer, comprising the following steps:

[0043] S1. Place the silicon steel sheet combination block between the upper clamping module and the lower clamping module, and connect them with connecting pieces to form a first assembly;

[0044] S2. Place the first assembly in the installation grooves of the first fixing module and the second fixing module;

[0045] S3. Use connecting pieces to correspondingly connect the first locking module and the second locking module to the sides of the first fixing module and the second fixing module;

[0046] S4. Place the first fixing module and the second fixing module correspondingly on the first magnetic conduction base and the second magnetic base, and use fitting pieces to connect the fixing module to the pressing plate.

[0047] The above embodiments only represent several implementation manners of the present invention, and the description thereof is relatively specific and detailed, but it should not be construed as a limitation to the scope of the patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention.

Claims

1. A generator transformer is provided with a transverse magnetic shielding structure between phases, characterized in that: The invention comprises a magnetic shielding assembly (13), wherein the magnetic shielding assembly (13) is mounted on a magnetic conductive base and arranged between two groups of iron core columns (12), wherein the magnetic shielding assembly (13) comprises a silicon steel sheet assembly block (1), a clamping module, a fixing module and a locking module, wherein the clamping module is connected to the surface of the silicon steel sheet assembly block (1), a mounting groove is provided on the surface of the fixing module, wherein the silicon steel sheet assembly block (1) is placed in the mounting groove, and the locking module is connected to the side of the fixing module via a connecting piece (10) to clamp the silicon steel sheet assembly block (1) in the mounting groove, and the fixing module is placed on the surface of the magnetic conductive base.

2. A generator transformer according to claim 1, wherein a transverse magnetic shielding structure is arranged between phases, characterized in that: The clamping module comprises an upper clamping module (2) and a lower clamping module (3), which are respectively connected to the upper and lower side surfaces of the silicon steel sheet assembly block (1) through a connecting piece (10).

3. The generator transformer according to claim 1 is provided with a transverse magnetic shielding structure between phases, characterized in that: The fixing module comprises a first fixing module (5) and a second fixing module (4), and the two ends of the silicon steel sheet assembly block (1) are respectively placed in the installation grooves opened in the first fixing module (5) and the second fixing module (4).

4. The generator transformer according to claim 1 is provided with a transverse magnetic shielding structure between phases, characterized in that: The locking module comprises a first locking module (6) and a second locking module (7), which are respectively connected to the sides of the first fixing module (5) and the second fixing module (4).

5. The generator transformer according to claim 1 is provided with a transverse magnetic shielding structure between phases, characterized in that: The magnetic conductive base comprises a first magnetic conductive base (9) and a second magnetic conductive base (8), and the first fixing module (5) and the second fixing module (4) are respectively connected to the surfaces of the first magnetic conductive base (9) and the second magnetic conductive base (8).

6. The generator transformer according to claim 1 is provided with a transverse magnetic shielding structure between phases, characterized in that: The fixing module is connected to the support plate (14) via a fitting (11).

7. The generator transformer according to claim 1 is provided with a transverse magnetic shielding structure between phases, characterized in that: The outer layer of the magnetic shielding assembly (13) is wrapped with insulating material to insulate it from the iron parts so as to connect the magnetic circuits between phases.

8. The generator transformer according to claim 2 is provided with a transverse magnetic shielding structure between phases, characterized in that: The connecting piece (10) is a latch or a screw.

9. A method for installing a generator transformer with transverse magnetic shielding between phases, using the generator transformer with transverse magnetic shielding between phases as claimed in any one of claims 1 to 8, characterized in that: The following steps are involved: S1, placing the silicon steel sheet assembly block between the upper clamping module and the lower clamping module, and connecting them with a coupling to form a first assembly; S2, placing the first assembly in the mounting grooves of the first fixing module and the second fixing module; S3, using a coupling member to connect the first locking module and the second locking module to the sides of the first fixing module and the second fixing module respectively; S4, placing the first fixing module and the second fixing module on the first magnetic conductive base and the second magnetic base respectively, and connecting the fixing modules to the holding plate by using a fitting.

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