A core frame connecting method and structure

Abstract

The application relates to an iron core frame connecting method and structure. The iron core frame connecting structure comprises an iron core piece, a clamping piece connected to the iron core piece, the clamping piece being clamped to the surface of the iron core piece, the clamping piece being close to the end surface of the iron core piece, the clamping piece comprising a first clamping piece and a second clamping piece, a pulling belt being arranged between the first clamping piece and the second clamping piece, the pulling belt being prepared from insulating material; a pulling plate being arranged on the side wall of the iron core piece, the pulling plate being connected with a supporting plate, the clamping piece comprising an upper clamping piece, the upper clamping piece being arranged on the surface of the iron core piece and close to the upper end surface of the iron core piece, the first clamping piece of the upper clamping piece being insulatedly connected with the supporting plate, and the second clamping piece of the upper clamping piece being electrically connected with the supporting plate; the iron core frame connecting structure is simple in structure, convenient to operate, flexible to use, and can effectively solve the problem of overheat of individual components caused by excessive internal circulating current of the iron core frame of an extra-high voltage converter transformer.

Description

Technical Field

[0001] This invention belongs to the field of transformer technology, specifically relating to a method and structure for connecting iron core frames. Background Technology

[0002] When a converter transformer is operating normally, leakage flux induces current in the core frame. The short-circuit loops of these induced currents will increase the losses of the core frame structural components. If no measures are taken, localized overheating is very likely to occur. In conventional large transformers, similar short-circuit loops are also formed in the upper and lower clamps, side yokes, and main column tie plates. However, the current caused by leakage flux is very small, and the eddy current losses of the core frame structural components are within permissible limits, so overheating of the structural components will not occur.

[0003] With the development of the ultra-high voltage (UHV) power industry, the demand for large-capacity converter transformers is increasing, and the electromagnetic load density on these transformers is significantly rising. Therefore, the leakage magnetic field has a very significant impact on large-capacity converter transformers, leading to substantial eddy current losses in the core frame and causing overheating in some structural components with smaller current-carrying areas. Traditional converter transformer core frame structures are no longer suitable for UHV large-capacity converter transformers. Therefore, a novel converter transformer core frame connection method is needed to effectively solve the overheating problem of structural components within the core frame of large-capacity converter transformers. Summary of the Invention

[0004] The purpose of this invention is to provide a simple and reasonably designed method and structure for connecting iron core frames in order to solve the above-mentioned problems.

[0005] The present invention achieves the above objectives through the following technical solutions:

[0006] A core frame connection structure includes a core component, the core component is connected to a clamping component, the clamping component is clamped to the surface of the core component, the clamping component is close to the end face of the core component, the clamping component includes a first clamping component and a second clamping component, and a pull strap is provided between the first clamping component and the second clamping component, the pull strap is made of insulating material.

[0007] As a further optimization of the present invention, the side wall of the core component is provided with a pull plate, the pull plate is connected to a support plate, the clamping component includes an upper clamping component, the upper clamping component is disposed on the surface of the core component and close to the upper end face of the core component, the first clamping component of the upper clamping component is insulatedly connected to the support plate, and the second clamping component of the upper clamping component is electrically connected to the support plate.

[0008] As a further optimization of the present invention, the clamping member includes a lower clamping member, which is disposed on the surface of the iron core member and close to the lower end face of the iron core member. The first clamping member of the lower clamping member is insulatedly connected to a pad, and the second clamping member of the lower clamping member is electrically connected to the pad.

[0009] As a further optimization of the present invention, a guide is provided between the first and second clips of both the upper and lower clamps, and a guide is also provided between the upper and lower clamps.

[0010] As a further optimization of the present invention, the lower clamp is connected to a T-shaped tube and an insulating plate.

[0011] As a further optimization of the present invention, the structure also includes a frame component, the surface of which is provided with a plurality of vertically arranged support plates, the iron core component is disposed through the support plates, and the clamping component is disposed on the surface of the iron core component.

[0012] As a further optimization of the present invention, the surface of the clamping member is provided with a connecting block, and the pull plate is disposed inside the frame member and can move closer to or further away from the iron core member.

[0013] As a further optimization of the present invention, the pull plate between the support plates includes a connecting plate and two sets of fixing plates. The fixing plates are respectively connected to the support plates at the upper and lower positions. The connecting plate is disposed between the two sets of fixing plates. A wire assembly is connected to the surface of the connecting plate near the iron core.

[0014] As a further optimization of the present invention, the fixed plate is provided with a defined inner block and an inner cavity, the fixed plate is provided with a limiting wire, the limiting wire passes through the defined inner block and is connected to the limiting wire in the adjacent fixed plate, the inner cavity is fixedly connected with an elastic rope, the other end of the elastic rope is fixed to the surface of the connecting plate, the limiting wire is provided with an elastic wire, and the elastic wire can be stretched.

[0015] A method for connecting an iron core frame includes a connecting structure comprising an iron core component. A clamping component is connected to the iron core component, clamping it to the surface of the iron core component. The clamping component is disposed near an end face of the iron core component. The clamping component includes a first clamping component and a second clamping component, with a pull strap between the first and second clamping components. The pull strap is made of an insulating material. The method further includes connecting the clamping component to the outer surface near the upper and / or lower end of the iron core component, with the pull strap isolating the connection between the first and second clamping components.

[0016] The beneficial effects of this invention are as follows: This invention uses conformal insulating T-tubes and conformal insulating plates to insulate one end of the metal structural components of the inner and outer frame pull strips from the clamps, while ensuring a reliable electrical connection at the other end, thus preventing short-circuit loops between the pull strips. To avoid loops between upper clamps, lower clamps, and between upper and lower clamps, one or two connection points are designed as insulated connections, and cables are used for reliable connections at low field strength locations to ensure single-point grounding between clamps. While ensuring that the metal structural components of the core pads, clamps, pull plates, and support plates are at low potentials, and preventing the formation of closed loops, this invention employs a pull strip design... The system features an insulated connection between the plate and the support plate, an insulated connection between the pad and one side of the lower clamp, and only one electrical connection between the support plate and the upper clamp. This effectively solves the problem of overheating in structural components within the core frame of the converter transformer. This solution can be used in conjunction with infrared imaging technology. When overheating is detected in a certain part, the connecting plate in the pull plate can be moved by the moving component, thereby reducing overheating of metal parts in the system. The entire structure and method are simple, easy to operate, and flexible in use, effectively solving the problem of overheating of individual components caused by excessive circulating current within the core frame of the UHV converter transformer. Attached Figure Description

[0017] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 This is a schematic diagram of the structure of the present invention for removing the iron core component;

[0020] Figure 3 This is another structural schematic diagram of the present invention;

[0021] Figure 4 This is a schematic diagram of the structure of the card holder of the present invention;

[0022] Figure 5 This is the invention Figure 3 A schematic diagram of the three-dimensional structure;

[0023] Figure 6 This is the invention Figure 3 Schematic diagram of the structure of the middle tension plate;

[0024] Figure 7 This is the invention Figure 6 A magnified structural diagram of point A in the diagram.

[0025] Reference numerals: 1. Core component; 11. Frame component; 12. Support plate component; 21. Clamping component; 211. First clamping component; 212. Second clamping component; 213. Connecting block; 22. Upper clamping component; 23. Lower clamping component; 3. Guide component; 4. Support plate; 5. Pull strap; 6. Pull plate; 61. Connecting plate component; 62. Fixing plate component; 621. Limiting inner block; 622. Inner cavity; 623. Elastic rope component; 63. Wire assembly; 631. Limiting wire; 632. Elastic wire; 7. Foot pad; 8. T-tube; 9. Insulating plate. Detailed Implementation

[0026] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. 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.

[0027] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0029] The present invention will be further explained below with reference to specific embodiments.

[0030] Example 1

[0031] like Figure 1 , Figure 2As shown, a core frame connection structure includes a core component 1, and a clamping component 21 is connected to the core component 1. The clamping component 21 is clamped to the surface of the core component 1 and is close to the end face of the core component 1. The clamping component 21 includes a first clamping component 211 and a second clamping component 212. A pull strap 5 is provided between the first clamping component 211 and the second clamping component 212. The pull strap 5 is made of insulating material.

[0032] Furthermore, a pull plate 6 is provided on the side wall of the core component 1, and a support plate 4 is connected to the pull plate 6. The clamping component 21 includes an upper clamping component 22, which is disposed on the surface of the core component 1 and close to the upper end face of the core component 1. The first clamping member 211 of the upper clamping member 22 is insulated from the support plate 4, and the second clamping member 212 of the upper clamping member 22 is electrically connected to the support plate 4. The pull plate 6 can further improve the stability of the core component 1. In this embodiment, the core component 1 is actually used in conjunction with core laminations.

[0033] Furthermore, the clamping member 21 includes a lower clamping member 23, which is disposed on the surface of the core member 1 and close to the lower end face of the core member 1. The first clamping member 211 of the lower clamping member 23 is insulatedly connected to the pad 7, and the second clamping member 212 of the lower clamping member 23 is electrically connected to the pad 7. In this scheme, it can be ensured that the metal structural components of the core member 1, including the pad 7, clamping member, pull plate 6, and support plate 4, cannot form a circulating current closure, and a single point is effectively grounded, solving the problem of high losses and overheating of the converter transformer core frame structural components. The pad 7 is in contact with the ground, and a metal conductor can also be inserted into the pad 7 for grounding purposes.

[0034] A guide 3 is provided between the first clamping member 211 and the second clamping member 212 of both the upper clamping member 22 and the lower clamping member 23, and a guide 3 is also provided between the upper clamping member 22 and the lower clamping member 23. In this embodiment, the guide 3 is a cable assembly, which connects the first clamping member 211 and the second clamping member 212 of the upper clamping member 22 and the first clamping member 211 and the second clamping member 212 of the lower clamping member 23. In this embodiment, the cable assembly also connects the upper clamping member 22 and the lower clamping member 23. The position, specifications, and fixing method of the cable assembly depend on the product. While ensuring that all metal structural components of the iron core frame are at a low potential, a closed loop of the circuit cannot be formed.

[0035] The lower clamp 23 is connected to a T-shaped tube 8 and an insulating plate 9. The T-shaped tube 8 is a suitable insulating T-shaped tube fitting, and the insulating plate 9 is a suitable insulating plate. The shape and material of both are not limited to those given in the example, and can be determined according to different actual positions and product conditions.

[0036] Example 2

[0037] Based on the above structure, such as Figure 3 - Figure 7 As shown, the structure also includes a frame component 11, the surface of which is provided with several sets of vertically arranged support plates 12. The iron core component 1 is disposed through the support plates 12, and the clamping component 21 is disposed on the surface of the iron core component 1. In this embodiment, the bottom of the frame component 11 is also provided with pads 7, T-shaped tubes 8 and insulating plates 9, but in this embodiment, several sets of vertically arranged support plates 12 are provided, and the support plates 12 are made of insulating material.

[0038] Furthermore, the surface of the clamp 21 is provided with a connecting block 213, and the pull plate 6 is disposed inside the frame 11 and can move closer to or further away from the core 1.

[0039] Specifically, the pull plate 6 between the support plates 12 includes a connecting plate 61 and two sets of fixing plates 62. The fixing plates 62 are respectively connected to the upper and lower support plates 12. The connecting plate 61 is disposed between the two sets of fixing plates 62. A wire assembly 63 is connected to the surface of the connecting plate 61 near the iron core 1. A limiting inner block 621 and an inner cavity 622 are provided inside the fixing plate 62. A limiting wire 631 is provided inside the fixing plate 62, passing through the limiting inner block 621 and connecting to the limiting wire 631 in the adjacent fixing plate 62. An elastic rope 623 is fixedly connected inside the inner cavity 622. The other end of the elastic rope 623 is fixed to the surface of the connecting plate 61. An elastic wire 632 is provided inside the limiting wire 631, and the elastic wire 632 can be stretched.

[0040] When the wire assembly 63 is connected to the connecting block 213 on the surface of the clamp 21, the wire assembly 63 becomes the guide 3. In this embodiment, the upper clamp 22 and the lower clamp 23 are integrated, which is suitable for the core component 1 to be a multi-group core block structure with a certain thickness. The upper and lower groups of block structures are connected by the connecting block 213. At this time, the pull strip 5 has a certain thickness. It should be noted that, regardless of whether it is embodiment 1 or embodiment 2, the number of pull strips is at least two groups, generally divided into four groups. In this embodiment, two groups can be selected. One group of pull strips 5 is provided with a guide 3. The guide 3 here can be a metal wire structure, which plays a conductive role, but the pull strip 5 itself is not conductive. In addition, the other group of pull strips 5 is also made of insulating material.

[0041] In this embodiment, a set of pull plates 6 is provided between the two sets of support plates 12. The set of pull plates 6 refers to a structure composed of two sets of fixed plates 62 and a set of connecting plates 61. The fixed plates 62 of the multiple sets of pull plates 6 are connected to each other and electrically connected through the limiting wires 631 inside the fixed plates 62. In use, a moving component is generally provided outside the connecting plate 61. The moving component drives the connecting plate 61 to move, so that the wire component 63 on its surface is connected to the connecting block 213, thereby realizing the electrical connection. This facilitates the connection and grounding of all the clamping parts 21. The lower end of the lowest pull plate 6 is connected to the pad 7.

[0042] It should also be noted that during the movement of the connecting plate 61, the elastic rope 623 inside the inner cavity 622 will be stretched. In actual use, a small pulley assembly can be connected to the end of the inner cavity 622 to guide the movement of the elastic rope 623. There is an elastic wire 632 inside the limiting wire 631 to facilitate the movement of the connecting plate 61.

[0043] A method for connecting an iron core frame includes a connecting structure comprising an iron core 1, wherein the iron core 1 is connected to a clamping member 21, the clamping member 21 clamping the surface of the iron core 1, the clamping member 21 being disposed near the end face of the iron core 1, the clamping member 21 comprising a first clamping member 211 and a second clamping member 212, a pull strap 5 being disposed between the first clamping member 211 and the second clamping member 212, the pull strap 5 being made of an insulating material, the method further comprising connecting the clamping member 21 to the outer surface near the upper end and / or lower end of the iron core 1, the pull strap 5 isolating the connection between the first clamping member 211 and the second clamping member 212.

[0044] In summary, it should be noted that, in use, the iron core frame connection method and structure utilizes conformal insulated T-tubes 8 and conformal insulated plates 9 to insulate one end of the metal structural components of the inner and outer frame pull straps 5 from the clamps, while ensuring a reliable electrical connection at the other end, thus preventing short-circuit loops between the pull straps 5. To avoid loops between the upper clamps, lower clamps, and between the upper and lower clamps, one or two connection points are designed as insulated connections, and cables are used for reliable connections at low field strength locations to ensure single-point grounding between clamps. To ensure that the iron core pads 7, clamps, pull plates 6, and support plates 4 are all at low potentials without forming a closed loop, the pull plates 6 and support plates 4 are insulated from one side, and the pads 7 and lower clamps 23 are insulated from one side. The connection between the insulation, support plate 4, and upper clamp 22 is only electrically connected at one point, which can effectively solve the problem of overheating of structural components in the core frame of the converter transformer. In embodiment 2, by setting a movable pull plate 6, which is used in conjunction with the conductor assembly 63, the lifespan of the guide 3 in embodiment 1 during continuous use can be reduced. This embodiment 2 can be used with infrared imaging technology. When overheating of a certain part is detected, the connecting plate 61 in the pull plate 6 can be moved by moving the component, thereby reducing the overheating of metal parts in the system. The entire structure and method are simple, easy to operate, and flexible in use, and can effectively solve the problem of overheating of individual components caused by excessive circulating current in the core frame of the UHV converter transformer.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A core frame connection structure, characterized in that, The device includes an iron core (1), which is connected to a clamping member (21). The clamping member (21) is clamped to the surface of the iron core (1) and is close to the end face of the iron core (1). The clamping member (21) includes a first clamping member (211) and a second clamping member (212). A pull strap (5) is provided between the first clamping member (211) and the second clamping member (212). The pull strap (5) is made of insulating material. The structure also includes a frame component (11), the surface of which is provided with several sets of vertically arranged support plates (12), the iron core component (1) is provided through the support plates (12), and the clamping component (21) is provided on the surface of the iron core component (1); The surface of the clamp (21) is provided with a connecting block (213), and the pull plate (6) is located inside the frame (11) and can move close to or away from the iron core (1); The pull plate (6) between the support plates (12) includes a connecting plate (61) and two sets of fixing plates (62). The fixing plates (62) are respectively connected to the support plates (12) at the upper and lower positions. The connecting plate (61) is disposed between the two sets of fixing plates (62). The surface of the connecting plate (61) near the iron core (1) is connected to a wire assembly (63). The fixed plate (62) is provided with a limiting inner block (621) and an inner cavity (622). The fixed plate (62) is provided with a limiting wire (631). The limiting wire (631) passes through the limiting inner block (621) and is connected to the limiting wire (631) in the adjacent fixed plate (62). An elastic rope (623) is fixedly connected in the inner cavity (622). The other end of the elastic rope (623) is fixed to the surface of the connecting plate (61). The limiting wire (631) is provided with an elastic wire (632), which can be stretched.

2. The iron core frame connection structure according to claim 1, characterized in that: The side wall of the core component (1) is provided with a pull plate (6), the pull plate (6) is connected to a support plate (4), the clamping component (21) includes an upper clamping component (22), the upper clamping component (22) is disposed on the surface of the core component (1) and close to the upper end face of the core component (1), the first clamping component (211) of the upper clamping component (22) is insulatedly connected to the support plate (4), and the second clamping component (212) of the upper clamping component (22) is electrically connected to the support plate (4).

3. The iron core frame connection structure according to claim 2, characterized in that: The clamping member (21) includes a lower clamping member (23), which is disposed on the surface of the iron core member (1) and close to the lower end face of the iron core member (1). The first clamping member (211) of the lower clamping member (23) is insulatedly connected to a pad (7), and the second clamping member (212) of the lower clamping member (23) is electrically connected to the pad (7).

4. The iron core frame connection structure according to claim 3, characterized in that: A guide (3) is provided between the first locking member (211) and the second locking member (212) of both the upper clamp (22) and the lower clamp (23), and a guide (3) is also provided between the upper clamp (22) and the lower clamp (23).

5. The iron core frame connection structure according to claim 4, characterized in that: The lower clamp (23) is connected to a T-shaped tube (8) and an insulating plate (9).

6. A method for connecting iron core frames, characterized in that, The method includes the iron core frame connection structure as described in claims 1-5, the connection structure including an iron core (1), the iron core (1) being connected to a clamping member (21), the clamping member (21) being clamped to the surface of the iron core (1), the clamping member (21) being disposed near the end face of the iron core (1), the clamping member (21) including a first clamping member (211) and a second clamping member (212), a pull strap (5) being disposed between the first clamping member (211) and the second clamping member (212), the pull strap (5) being made of insulating material, the method further including connecting the clamping member (21) to the outer surface near the upper end and / or lower end of the iron core (1), the pull strap (5) isolating the connection between the first clamping member (211) and the second clamping member (212).

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