Dry-type transformer low-voltage coil and preparation method thereof

Abstract

The embodiment of the invention discloses a dry-type transformer low-voltage coil and a preparation method thereof.The dry-type transformer low-voltage coil comprises a coil barrel formed by winding multiple foil winding layers and a supporting strip mechanism, the supporting strip mechanism is supported between the foil winding layers to form an air channel, and the supporting strip mechanism comprises a clamping strip and a supporting strip; clamping grooves corresponding to the supporting strips are formed in the clamping strips, and the supporting strips are arranged in the clamping grooves. The anti-seismic performance of the coil can be improved, and guarantee is provided for long-term operation of the coil; the production efficiency can be improved, and time and labor are saved.

Description

Technical Field

[0001] The present invention relates to the technical field of transformers, and particularly to a dry-type transformer low-voltage coil and a preparation method thereof. Background Art

[0002] In order to increase heat dissipation, the existing dry-type transformer low-voltage coils usually design one or even more air ducts for heat dissipation. The air ducts are formed by supporting a plurality of I-shaped braces arranged at equal intervals. The braces of the existing dry-type transformer low-voltage coils have a risk of falling off under high-vibration working conditions, posing a safety hazard to the long-term operation of the product. Before winding the existing dry-type transformer low-voltage coils, equal-scale lines need to be drawn on the upper and lower end faces of the mold as the position marks for placing the I-shaped braces when winding the air ducts. This method is time-consuming and laborious. Moreover, since the mold is arc-shaped, it may be necessary to mark the scale lines multiple times to find equidistant points, resulting in large errors. In addition, the mold is sometimes shared by multiple projects, and due to different air duct positions, the mold scribing positions are different. The messy marked lines cause confusion to the operators and affect the production efficiency. Summary of the Invention

[0003] The technical problem to be solved by the embodiments of the present invention is to provide a dry-type transformer low-voltage coil and a preparation method thereof to reduce the risk of brace falling off and improve the production efficiency.

[0004] To solve the above technical problem, an embodiment of the present invention provides a dry-type transformer low-voltage coil, including a coil cylinder formed by winding multiple layers of foil winding layers and a brace mechanism. The brace mechanism is supported between the foil winding layers to form an air duct. The brace mechanism includes a clamping strip and a brace. The clamping strip is provided with a card slot corresponding to the brace, and the brace is installed in the card slot.

[0005] Further, the card slot is a C-shaped slot.

[0006] Further, the top of the card slot extends to the top end of the clamping strip and the top end of the card slot is open, and a limiting portion is provided at the position corresponding to the bottom end of the card slot on the clamping strip.

[0007] Further, the brace mechanism is parallel to the axis of the coil cylinder.

[0008] Further, the cross-section of the brace mechanism is I-shaped.

[0009] Further, an anti-falling mark is provided on the clamping strip.

[0010] Correspondingly, an embodiment of the present invention also provides a preparation method of a dry-type transformer low-voltage coil, including: Step 1: Prepare prepreg, clamping strip and brace according to the air duct height and the circumference of the circle. Unfold the prepreg, bond the clamping strip to the prepreg, and then install the brace to prepare an air duct curtain; Step 2: Use a foil winding machine to wind the coil tube. When winding to the air duct, place the air duct curtain, directly wind the air duct, and then continue winding to obtain the low-voltage coil of the dry-type transformer.

[0011] The beneficial effects of the present invention are as follows: The present invention can improve the seismic performance of the coil and provide guarantee for the long-term operation of the coil; the present invention can improve production efficiency, saving time and effort. Description of the Drawings

[0012] Figure 1 is a three-dimensional structure diagram of the low-voltage coil of the dry-type transformer according to an embodiment of the present invention.

[0013] Figure 2 is a three-dimensional structure diagram of the support according to an embodiment of the present invention.

[0014] Figure 3 is a three-dimensional structure diagram of the card strip according to an embodiment of the present invention.

[0015] Figure 4 is a three-dimensional structure diagram of the air duct curtain according to an embodiment of the present invention.

[0016] Explanation of the Reference Numerals in the Drawings Coil tube 10, prepreg 11, air duct 12, support bar mechanism 20, card strip 21, support bar 22, card slot 23, limiting portion 24, copper busbar 30. Detailed Embodiment

[0017] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be further described in detail below with reference to the drawings and specific embodiments.

[0018] In the embodiments of the present invention, if there are directional indications (such as up, down, left, right, front, back...), they are only used to explain the relative position relationship and movement situation between components in a certain specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly.

[0019] In addition, in the present invention, the descriptions such as "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature.

[0020] Please refer to Figures 1 to 3The low-voltage coil of the dry-type transformer of the embodiment of the present invention includes a coil barrel, which is wound with multiple layers of foil windings (the coil barrel generally also includes an insulating bracket and a copper bar arranged on the insulating bracket), and a support bar mechanism is provided between the layers of the coil barrel, and the support bar mechanism is supported between the foil windings. The foil winding layer is composed of copper foil / aluminum foil + interlayer insulation (i.e., prepreg cloth), which is isolated by the prepreg cloth to ensure electrical insulation and mechanical strength. The air duct is formed by a plurality of support bar mechanisms arranged at equal intervals. The air duct facilitates air circulation and improves the heat dissipation effect. The specific number of air ducts is set according to the specifications of the low-voltage coil of the dry-type transformer.

[0021] The support bar mechanism includes a clamping bar and a support bar, the clamping bar is provided with a clamping slot corresponding to the support bar, and the support bar is installed in the clamping slot. The clamping bar and support bar structure of the present invention can improve the longitudinal and transverse earthquake resistance, thereby reducing the risk of the support bar falling.

[0022] As an embodiment, the card slot is a C-shaped slot. The C-shaped slot is easy to assemble, and while ensuring the connection strength between the card strip and the support strip, it also improves the shock resistance. Preferably, both sides of the bottom of the C-shaped slot are R angles to improve the shock resistance and facilitate assembly.

[0023] As an implementation method, the top of the slot extends to the top of the card strip and the top of the slot is open, and a limiting portion is provided on the card strip corresponding to the bottom of the slot. The top of the slot is open, which is convenient for users to install the support bar; the limiting portion limits the support bar to prevent it from falling and improves the shock resistance.

[0024] As an implementation mode, the support bar mechanism is parallel to the axis of the coil tube, that is, the air passage is connected vertically, which can improve the heat dissipation effect, increase the overall strength of the coil, and improve the shock resistance.

[0025] As an implementation method, the cross section of the support bar mechanism is an I-shaped structure to maintain structural stability and prevent deformation. Preferably, the support bar is symmetrical along the central axis.

[0026] As an implementation method, an anti-fall mark is provided on the card strip to facilitate the user to assemble the card strip and the support bar.

[0027] The method for preparing a low-voltage coil of a dry-type transformer according to an embodiment of the present invention comprises step 1 and step 2.

[0028] Step 1: Prepare prepreg, card strips and stays according to the airway height and circumference. Please refer to Figure 4 , unfold the prepreg, mark the lines at equal intervals with a pen and a ruler, use high-temperature resistant glue to glue the card strips to the prepreg according to the marks, then apply high-temperature resistant glue to the card slots, install the stays, and prepare the airway curtain.

[0029] Step 2: Use a foil winding machine to wind the coil cylinder. When winding to the air duct, place the air duct curtain at the corresponding position, directly wind the air duct, and then continue winding to obtain the low-voltage coil of the dry-type transformer. The present invention does not need to be placed one by one, improving the efficiency.

[0030] Through the bonding and cooperation of the prepreg, the card strip, and the support strip, the present invention is prepared in advance, which is convenient, fast, time-saving and labor-saving when winding the air duct, improves the working efficiency, and can operate for a long time under vibration conditions.

[0031] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalent scope.

Claims

1. A low-voltage coil of a dry-type transformer, comprising a coil barrel formed by winding multiple layers of foil and a stay mechanism, wherein the stay mechanism is supported between the foil winding layers to form an air passage, characterized in that: The support bar mechanism comprises a clamping bar and a support bar. The clamping bar is provided with a clamping slot corresponding to the support bar, and the support bar is installed in the clamping slot.

2. The dry-type transformer low-voltage coil according to claim 1, characterized in that: The card slot is a C-shaped slot.

3. The dry-type transformer low-voltage coil according to claim 1, characterized in that: The top of the card slot extends to the top of the card strip and the top of the card slot is open, and a limiting portion is provided on the card strip at a position corresponding to the bottom of the card slot.

4. The dry-type transformer low-voltage coil according to claim 1, characterized in that: The stay mechanism is parallel to the axis of the coil barrel.

5. The dry-type transformer low-voltage coil according to claim 1, characterized in that: The cross section of the support bar mechanism is an I-shape.

6. The dry-type transformer low-voltage coil according to claim 1, characterized in that: There is an anti-fall mark on the card strip.

7. A method for preparing a low-voltage coil of a dry-type transformer as claimed in any one of claims 1 to 6, characterized in that: include: Step 1: Prepare prepreg, card strips and stays according to the airway height and circumference, unfold the prepreg, bond the card strips to the prepreg, and then install the stays to prepare the airway curtain; Step 2: Use a foil winding machine to wind the coil tube. When winding to the airway, place the airway curtain, wind the airway directly, and then continue winding to obtain the low-voltage coil of the dry-type transformer.

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