Dry-type grounding transformer iron core structure with non-porous iron core

Abstract

The utility model belongs to the field of electric power system equipment, and provides a dry-type grounding transformer iron core structure with a nonporous iron core, which comprises an iron core piece, a pulling plate piece, an upper clamping piece, a lower clamping piece, a binding piece and a pulling rod piece. According to the iron core piece, a hole opening structure is omitted, a clamping and binding structure is adopted for fixing, the product structure can be guaranteed, meanwhile, the problems that a magnetic circuit of a silicon steel sheet is changed due to punching, magnetic flux is distributed unevenly, eddy current loss and magnetic hysteresis loss are increased are solved, and the problems that the local temperature is possibly increased due to punching, and the product quality is affected are solved. The heat stability and the long-term reliability of the transformer are influenced, and the noise level of the transformer is possibly influenced by punching.

Description

Technical Field

[0001] The utility model belongs to the field of power system equipment, and in particular relates to a dry-type grounding transformer core structure with a core having no holes. Background Art

[0002] A grounding transformer is a type of transformer with a specific purpose. Its main function is to provide a central point for an ungrounded system to facilitate grounding protection. The structure of a dry-type grounding transformer is similar to that of an ordinary dry-type transformer.

[0003] Current product issues: In traditional transformer manufacturing, the core is typically constructed from multiple layers of silicon steel sheets, each secured by holes drilled and bolted with other fasteners. While this approach ensures structural stability, drilling holes alters the magnetic circuit of the silicon steel sheets, leading to uneven distribution of magnetic flux and increased eddy current and hysteresis losses. Drilling holes can also cause localized temperature increases, impacting the transformer's thermal stability and long-term reliability. It can also affect the transformer's noise level. Utility Model Content

[0004] In order to overcome the above-mentioned shortcomings of the prior art, the purpose of the present utility model is to provide a dry-type grounding transformer core structure with no holes in the core.

[0005] The technical solution adopted by the utility model to solve its technical problems is:

[0006] A dry-type grounding transformer core structure with a core having no holes, comprising a core piece, a pull plate piece, an upper clamping piece, a lower clamping piece, a binding piece and a pull rod piece;

[0007] The iron core piece includes an iron core column, an upper iron yoke and a lower iron yoke, wherein the upper iron yoke and the lower iron yoke are respectively arranged at the upper and lower ends of the iron core column;

[0008] The upper clamping piece and the lower clamping piece are respectively connected to the upper iron yoke piece and the lower iron yoke piece through the pull rod piece;

[0009] The two ends of the pulling plate are respectively connected to the upper clamping piece and the lower clamping piece, and the binding piece is used to bind the pulling plate piece and the iron core column, bind the iron core column and the upper iron yoke, bind the iron core column and the lower iron yoke, bind the upper clamping piece and the upper iron yoke, and bind the lower clamping piece and the lower iron yoke.

[0010] Preferably, the binding member includes an alkali-free tape and a prepreg, the prepreg and the alkali-free tape are both a five-layered circumferential structure, and the alkali-free tape is arranged on both sides of the prepreg.

[0011] Preferably, the binding members for binding the pulling plate member and the core column are arranged along the vertical direction of the core column, and the spacing between the binding members on the pulling plate member is 90 mm to 110 mm.

[0012] Preferably, the number of the upper clamping members and the lower clamping members is two, a clamping portion is formed between the two upper clamping members or the two lower clamping members, and the upper clamping members and the lower clamping members are in sliding cooperation with the pull rod member.

[0013] Preferably, the pull rod member is a screw member, and a locking nut member is provided at the end of the screw member.

[0014] Preferably, the pull rod members are provided at both ends of the upper clamping member and the lower clamping member, and the number of the screw members at either end of the upper clamping member and the lower clamping member is two, and the screw members are arranged opposite to each other up and down.

[0015] Preferably, the upper clamping piece includes a high-pressure upper clamping piece and a low-pressure upper clamping piece.

[0016] Compared with the prior art, the beneficial effects of the present invention include:

[0017] In the dry-type grounded transformer core structure with no holes in the core of the present application, the core parts have no opening structure and are fixed by a clamping and binding structure. This can ensure the product structure while avoiding the problem that punching will change the magnetic circuit of the silicon steel sheet, resulting in uneven distribution of magnetic flux, increased eddy current loss and hysteresis loss, and the problem that punching may also cause local temperature increase, affecting the thermal stability and long-term reliability of the transformer, and the problem that punching may also affect the noise level of the transformer. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 It is the main view of the present utility model.

[0020] Figure 2 for Figure 1 AA cross-section diagram.

[0021] Figure 3 It is a top view of the utility model.

[0022] Figure 4 This is a schematic structural diagram of the iron core member of the present utility model.

[0023] in:

[0024] 1- iron core, 101- iron core column, 102- upper iron yoke, 103- lower iron yoke, 2- pull plate, 3- high-pressure upper clamp, 4- low-pressure upper clamp, 5- lower clamp, 6- pull rod, 7- alkali-free tape, 8- prepreg, 9- locking nut. DETAILED DESCRIPTION

[0025] In order to more clearly understand the above-mentioned purposes, features and advantages of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the absence of conflict, the embodiments of this application and the features in the embodiments can be combined with each other. In the following description, many specific details are set forth in order to fully understand the present invention. The embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0027] Example:

[0028] like Figure 1-4 As shown, this embodiment provides a dry-type grounding transformer core structure with no core holes, including a core member 1, a pull plate member 2, an upper clamping member, a lower clamping member 5, a binding member and a pull rod member 6;

[0029] The core member 1 includes an iron core column 101, an upper iron yoke 102 and a lower iron yoke 103. The upper iron yoke 102 and the lower iron yoke 103 are respectively provided at the upper and lower ends of the iron core column 101.

[0030] The upper clamping member and the lower clamping member 5 are connected to the upper iron yoke 102 and the lower iron yoke 103 respectively through the pull rod member 6;

[0031] The two ends of the pull plate 2 are respectively connected to the upper clamp and the lower clamp 5, and the binding parts are used to bind the pull plate 2 and the iron core column 101, bind the iron core column 101 and the upper iron yoke 102, bind the iron core column 101 and the lower iron yoke 103, bind the upper clamp and the upper iron yoke 102, and bind the lower clamp 5 and the lower iron yoke 103.

[0032] In the dry-type grounded transformer core structure with no holes in the core of this embodiment, the core pieces 1 have no opening structure and are fixed with a clamping and binding structure. This ensures the product structure while avoiding the problem that punching will change the magnetic circuit of the silicon steel sheet, resulting in uneven distribution of magnetic flux, increased eddy current loss and hysteresis loss, as well as the problem that punching may cause local temperature rise, affecting the thermal stability and long-term reliability of the transformer, and the problem that punching may also affect the noise level of the transformer.

[0033] In this embodiment, the binding member specifically includes an alkali-free tape 7 and a prepreg 8 . The prepreg 8 and the alkali-free tape 7 are both a five-layered circumferential structure. The alkali-free tape 7 is arranged on both sides of the prepreg 8 .

[0034] Specifically, the binding pieces for binding the tension plate 2 and the core column 101 are arranged along the vertical direction of the core column 101, and the spacing between the binding pieces on the tension plate 2 is 90 mm to 110 mm.

[0035] Specifically, there are two upper clamps and two lower clamps 5, and a clamping portion is formed between the two upper clamps or lower clamps 5. The upper clamps and lower clamps 5 are slidably engaged with the pull rod 6. By sliding the upper clamps and lower clamps 5 and the pull rod 6, the size of the clamping portion can be adjusted to meet different size requirements.

[0036] Specifically, the pull rod 6 is a screw rod, and a locking nut 9 is provided at the end of the screw rod. The locking nut 9 can ensure that the clamping portion stably clamps the upper iron yoke 102 and the lower iron yoke 103.

[0037] Specifically, the pull rod members 6 are provided at both ends of the upper clamping member and the lower clamping member 5 , and there are two screw members at either end of the upper clamping member and the lower clamping member 5 , which are arranged opposite to each other in the upper and lower directions.

[0038] Specifically, the upper clamping piece includes a high-pressure upper clamping piece 3 and a low-pressure upper clamping piece 4 .

[0039] The specific operations of the above structure are as follows:

[0040] 1. First, connect the core piece 1 with the upper and lower clamps 5 by pulling the plate 2;

[0041] 2. The upper clamping piece and the lower clamping piece 5 are formed into a clamping part through the pull rod piece 6 and clamped and connected with the upper iron yoke piece 102 and the lower iron yoke piece 103 respectively;

[0042] 3. Fix the core piece 1 to the pull plate piece 2, the upper clamping piece, and the lower clamping piece 5 through the binding piece, and fix the core column 101 to the upper iron yoke piece 102 and the lower iron yoke piece 103.

[0043] 4. Binding method of the core column 101 and the pull plate 2: first, fit the pull plate 2 to the core column 101, then use prepreg 8 to bind 5 layers at intervals of 100 mm along the vertical direction of the core column 101, and then use alkali-free tape 7 to bind 5 layers on each side of the prepreg 8.

[0044] Therefore, the above structure can realize convenient installation and connection, and the overall manufacturing cost is low, which is convenient for promotion and production use.

[0045] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Therefore, any modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A dry-type grounding transformer core structure with no holes in the core, characterized in that: include: Iron core parts, pull plate parts, upper clamping parts, lower clamping parts, binding parts and pull rod parts; The iron core piece includes an iron core column, an upper iron yoke and a lower iron yoke, wherein the upper iron yoke and the lower iron yoke are respectively arranged at the upper and lower ends of the iron core column; The upper clamping piece and the lower clamping piece are respectively connected to the upper iron yoke piece and the lower iron yoke piece through the pull rod piece; The two ends of the pulling plate are respectively connected to the upper clamping piece and the lower clamping piece, and the binding piece is used to bind the pulling plate piece and the iron core column, bind the iron core column and the upper iron yoke, bind the iron core column and the lower iron yoke, bind the upper clamping piece and the upper iron yoke, and bind the lower clamping piece and the lower iron yoke.

2. The dry-type grounding transformer core structure with no core holes according to claim 1, characterized in that: The binding member includes an alkali-free tape and a prepreg. Both the prepreg and the alkali-free tape are a five-layered circumferential structure. The alkali-free tape is arranged on both sides of the prepreg.

3. The dry-type grounding transformer core structure with no core holes according to claim 1, characterized in that: The binding members for binding the pulling plate and the core column are arranged along the vertical direction of the core column, and the spacing between the binding members on the pulling plate is 90 mm to 110 mm.

4. The dry-type grounding transformer core structure with no core holes according to claim 1, characterized in that: There are two upper clamping members and two lower clamping members, a clamping portion is formed between the two upper clamping members or the two lower clamping members, and the upper clamping members and the lower clamping members are slidably matched with the pull rod member.

5. The dry-type grounding transformer core structure with no core holes according to claim 4, characterized in that: The pull rod is a screw rod, and a locking nut is provided at the end of the screw rod.

6. The dry-type grounded transformer core structure with no core holes according to claim 5, characterized in that: The pull rod is arranged at both ends of the upper clamp and the lower clamp. There are two screw rods at either end of the upper clamp or the lower clamp, and the screw rods are arranged opposite to each other up and down.

7. The dry-type grounding transformer core structure with no core holes according to claim 1, characterized in that: The upper clamping piece includes a high-pressure upper clamping piece and a low-pressure upper clamping piece.

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