Calculation method for ox horn cushion block of transformer
By setting up a horn pad on the internal structure of the transformer, calculating the lift distance and center angle of the wire, and establishing a functional expression of the wire lift curve, the problem of inaccurate calculation of the horn pad size is solved and the transformer performance is improved.
Patent Information
- Application Number
- CN202411723563.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-28
- Publication Date
- 2025-03-25
AI Technical Summary
In the prior art, the size of the transformer horn pad is inaccurate, resulting in problems affecting the performance of the transformer.
By setting the inner diameter side and outer diameter side of the internal structure, and calculating the lift distance and center angle of the wire, establishing a functional expression of the wire lift curve, we can obtain the relevant data of the boulder cushion.
It improves the accuracy of calves cushion size calculation, avoids secondary processing and rework, and improves work efficiency.
Smart Images
Figure CN119694758A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of transformers, and in particular relates to a method for calculating a transformer horn pad. Background Art
[0002] During the transformer winding process, the conductors need to be transposed according to production requirements. A large gap similar to a "scissor mouth" will be generated at the conductor transposition. In order to make the transition smooth when the conductor climbs and ensure the overall performance of the coil, the horn pads are generally arranged on the inner diameter side and outer diameter side of the conductor at the conductor transposition to fill the gap where the coil is not full of turns. The horn pads are made of insulating materials. Compared with the earliest paper pads, the horn pads make the winding more compact. Affected by the size of the coil and the wire, the size of the horn pads required for each group of coils is inconsistent. Therefore, it is generally necessary to process the horn pads according to the actual situation of the transformer coil. The horn pads are directly related to the transition and stress conditions of the wire. The accuracy of the horn pad size has a great impact on the quality of the transformer coil. At present, the calculation of horn blocks usually adopts empirical formula algorithm or CAD drawing method. However, due to the diverse changes in actual products, the empirical formula is prone to deviations, resulting in low dimensional accuracy of horn blocks and low CAD drawing efficiency. The smooth transition length of the wire is determined by experience, and then a circle is drawn at three points to obtain the curve. This cannot accurately describe the transition length and the number of incomplete turns of the coil. The horn block has poor fit with the wire and needs to be adjusted according to actual conditions during installation. Summary of the invention
[0003] The object of the present invention is to provide a method for calculating transformer horn pads, aiming to solve the problem that the horn pad size calculation is inaccurate and affects the transformer performance.
[0004] To achieve the above object, the technical solution adopted by the present invention is: to provide a transformer horn pad calculation method, comprising the following steps: S1. The transposed conductor is wound on the internal structure, an inner diameter side horn pad is arranged on the inner side of the transposed conductor, and the outer side wall of the inner diameter side horn pad fits the inner side wall of the transposed conductor, and an outer diameter side horn pad is arranged on the outer side of the transposed conductor, and the inner side wall of the outer diameter side horn pad fits the outer side wall of the transposed conductor; S2. Calculate the lifting distance h of the inner side wall of the transposed conductor at the second end where the thickness of the inner diameter side horn pad is the largest; S3, the inner wall of the transposed conductor is tangent to the outer circumference of the internal structure at the second end of the inner diameter side horn pad, and the central angle α of the transposed inner diameter side tangent on the internal structure is calculated; S4. Calculate the shortest transition distance of the outer wall of the transposed conductor at the transposition point according to the central angle α. At this time, the curve where the inner wall of the transposed conductor is located is the lifting curve of the transposed conductor. S5. Establish a function expression for the lifting curve of the inner wall of the transposed conductor when the central angle is α; S6. According to the function expression of the wire lifting curve, the relevant data of the inner wall and the outer wall of the inner diameter side horn pad and the outer diameter side horn pad are obtained.
[0005] In a possible implementation, the function expression of the outer wall of the inner diameter side horn pad is consistent with the function expression of the lifting curve of the inner wall of the conductor, and the inner wall of the inner diameter side horn pad is an arc surface that fits the internal structure.
[0006] In a possible implementation, the central angle of the inner side wall of the inner diameter side horn pad is α.
[0007] In a possible implementation, the thickness of the second end of the inner diameter side horn spacer is equal to the thickness of the transposed conductor.
[0008] In a possible implementation, the function expression of the inner wall of the outer diameter side horn pad and the function expression of the outer wall of the inner diameter side horn pad differ by the thickness of the winding of the transposed conductor.
[0009] In a possible implementation, the outer side wall of the outer diameter side horn pad is an arc surface, and its radius is equal to the radius of the transposed conductor after the transposition is completed.
[0010] In a possible implementation, the central angle of the outer wall of the outer diameter side horn pad is α.
[0011] In a possible implementation, the thickness of the first end of the outer diameter side horn spacer with the largest thickness is equal to the thickness of the transposed conductor.
[0012] In a possible implementation, the first end of the inner diameter side horn pad and the first end of the outer diameter side horn pad are located on the same radius of the internal structure, and the second end of the inner diameter side horn pad and the second end of the thickness of the outer diameter side horn pad are located on the same radius of the internal structure.
[0013] In a possible implementation, two endpoints and a midpoint are selected from the function expression of the wire lifting curve to make a fitting circle for calculating the inner / outer side walls of the inner diameter side horn pad and the outer diameter side horn pad.
[0014] The beneficial effects of the transformer horn pad calculation method provided by the present invention are: Compared with the prior art, the transposed conductor is wound on the internal structure, the inner diameter side horn pad is arranged between the transposed conductor and the internal structure, the inner side wall of the inner diameter side horn pad fits the outer side wall of the internal structure, the inner side wall of the transposed conductor fits the outer side wall of the inner diameter side horn pad, the outer diameter side horn pad is arranged on the outside of the transposed conductor, the inner side wall of the outer diameter side horn pad fits the outer side wall of the transposed conductor, the second end of the inner diameter side horn pad has the largest thickness, the second end thickness of the inner diameter side horn pad is the lifting distance h of the inner side wall of the transposed conductor, and the inner side wall of the transposed conductor is cut toward the outer circumference of the internal structure at the second end of the inner diameter side horn pad. line, the center angle of the tangent line of the transposed inner diameter side on the internal structure is α, the center angle α of the tangent line of the transposed inner diameter side on the internal structure is used to calculate the shortest transition distance of the inner wall of the transposed conductor at the transposition point, and a rectangular coordinate system is established to obtain the function expression of the lifting curve of the inner wall of the transposed conductor. According to the function expression of the conductor lifting curve, the relevant data of the inner wall and outer wall of the inner diameter side horn pad and the outer diameter side horn pad are solved. The calculation is convenient and fast, which improves the accuracy of the size calculation of the inner diameter side horn pad and the outer diameter side horn pad, avoids secondary processing and rework of the inner diameter side horn pad and the outer diameter side horn pad, and improves work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0016] Figure 1 A schematic diagram of the structure of the transposed conductor transition used in an embodiment of the present invention; Figure 2 This is a schematic structural diagram of the inner diameter side horn pad and the outer diameter side horn pad used in an embodiment of the present invention.
[0017] In the figure: 1. Horn pad on the inner diameter side; 2. Horn pad on the outer diameter side; 3. Internal structure; 4. Support bar; 5. Transposed conductor. DETAILED DESCRIPTION
[0018] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.
[0019] Please refer to Figure 1 as well as Figure 2Now, a specific implementation method of a transformer horn pad calculation method provided by the present invention is described, including the following steps: S1, the transposed conductor 5 is wound on the internal structure 3, the inner side of the transposed conductor 5 is provided with an inner diameter side horn pad 1, the outer side wall of the inner diameter side horn pad 1 fits the inner side wall of the transposed conductor 5, the outer side of the transposed conductor 5 is provided with an outer diameter side horn pad 2, the inner side wall of the outer diameter side horn pad 2 fits the outer side wall of the transposed conductor 5; S2, calculating the lifting distance h of the inner side wall of the transposed conductor 5 at the second end where the thickness of the inner diameter side horn pad 1 is the largest; S3, the inner wall of the transposed conductor 5 is tangent to the outer circumference of the internal structure 3 at the second end of the inner diameter side horn pad 1, and the central angle α of the transposed inner diameter side tangent on the internal structure 3 is calculated; S4, calculating the shortest transition distance of the outer wall of the transposed conductor 5 at the transposition position according to the central angle α, and at this time, the curve where the inner wall of the transposed conductor 5 is located is the lifting curve of the transposed conductor 5; S5, establishing a function expression of the lifting curve of the inner wall of the transposed conductor 5 when the central angle is α; S6. According to the function expression of the wire lifting curve, the relevant data of the inner wall and the outer wall of the inner diameter side horn pad 1 and the outer diameter side horn pad 2 are obtained by solving.
[0020] The present invention provides a transformer horn pad calculation method. Compared with the prior art, the transposed conductor 5 is wound on the internal structure 3, the inner diameter side horn pad 1 is arranged between the transposed conductor 5 and the internal structure 3, the inner side wall of the inner diameter side horn pad 1 fits the outer side wall of the internal structure 3, the inner side wall of the transposed conductor 5 fits the outer side wall of the inner diameter side horn pad 1, the outer diameter side horn pad 2 is arranged on the outer side of the transposed conductor 5, the inner side wall of the outer diameter side horn pad 2 fits the outer side wall of the transposed conductor 5, the second end of the inner diameter side horn pad 1 has the largest thickness, the second end thickness of the inner diameter side horn pad 1 is the lifting distance h of the inner side wall of the transposed conductor 5, and the inner side wall of the transposed conductor 5 is inward at the second end of the inner diameter side horn pad 1. The outer circumference of the internal structure 3 is made into a transposed inner diameter side tangent, and the center angle of the transposed inner diameter side tangent on the internal structure 3 is α. The center angle α of the transposed inner diameter side tangent on the internal structure 3 is used to calculate the shortest transition distance of the inner wall of the transposed conductor 5 at the transposition position, and a rectangular coordinate system is established to obtain the function expression of the lifting curve of the inner wall of the transposed conductor 5. According to the function expression of the conductor lifting curve, the relevant data of the inner wall and the outer wall of the inner diameter side horn pad 1 and the outer diameter side horn pad 2 are solved, and the calculation is convenient and fast, which improves the accuracy of the size calculation of the inner diameter side horn pad 1 and the outer diameter side horn pad 2, avoids the secondary processing and rework of the inner diameter side horn pad 1 and the outer diameter side horn pad 2, and improves the work efficiency.
[0021] As a specific implementation method of the transformer horn pad calculation method provided by the present invention, please refer to Figure 1 as well as Figure 2 The function expression of the outer wall of the inner diameter side horn pad 1 is consistent with the function expression of the lifting curve of the inner wall of the conductor, and the inner wall of the inner diameter side horn pad 1 is an arc surface that fits the internal structure 3.
[0022] For details, please refer to Figure 1 as well as Figure 2 The outer wall of the inner diameter side horn pad 1 is arranged in contact with the inner wall of the conductor, that is, the function expression of the lifting curve of the inner wall of the conductor can be used as the function expression of the outer wall of the inner diameter side horn pad 1, and the inner wall of the inner diameter side horn pad 1 is arranged in contact with the outer wall of the internal structure 3, and the internal structure 3 is cylindrical, that is, the inner wall of the inner diameter side horn pad 1 is an arc surface, and the radius of the inner wall of the inner diameter side horn pad 1 is equal to the radius of the internal structure 3.
[0023] As a specific implementation method of the transformer horn pad calculation method provided by the present invention, please refer to Figure 1 as well as Figure 2 The central angle of the inner wall of the inner diameter side horn pad 1 is α.
[0024] For details, please refer to Figure 1 as well as Figure 2 The central angle of the inner wall of the inner diameter side horn pad 1 is equal to the central angle of the transposed inner diameter side tangent on the internal structure 3, both of which are α.
[0025] As a specific implementation method of the transformer horn pad calculation method provided by the present invention, please refer to Figure 1 as well as Figure 2 The thickness of the second end of the inner diameter side horn pad 1 is equal to the thickness of the transposed conductor 5.
[0026] For details, please refer to Figure 1 as well as Figure 2 The thickness of the second end of the inner diameter side horn pad 1 is the thickness of the transposed conductor 5, the transposed conductor 5 climbs by the thickness of the transposed conductor 5, and the transposed conductor 5 after transposition is wound on the outside of the conductor before transposition.
[0027] As a specific implementation method of the transformer horn pad calculation method provided by the present invention, please refer to Figure 1 as well as Figure 2 The function expression of the inner wall of the outer diameter side horn pad 2 differs from the function expression of the outer wall of the inner diameter side horn pad 1 by the thickness of the winding of the transposed conductor 5.
[0028] For details, please refer to Figure 1 as well as Figure 2The inner wall of the outer diameter side horn pad 2 is arranged in contact with the outer wall of the transposed conductor 5. According to actual requirements, the transposed conductor 5 can be wound with multiple turns after transposition, and then the outer diameter side horn pad 2 is placed on the outside. The function expression of the outer wall of the inner diameter side horn pad 1 plus the increased thickness of the transposed conductor 5 (the increased thickness is the product of the number of winding turns and the thickness of the transposed conductor 5) is the function expression of the inner wall of the outer diameter side horn pad 2.
[0029] As a specific implementation method of the transformer horn pad calculation method provided by the present invention, please refer to Figure 1 as well as Figure 2 The outer wall of the outer diameter side horn pad 2 is an arc surface, and its radius is equal to the radius of the transposed conductor 5 after the transposition is completed.
[0030] For details, please refer to Figure 1 as well as Figure 2 The outer side wall of the outer diameter side horn pad 2 is an arc surface, and the outer side wall of the outer diameter side horn pad 2 and the transposed conductor 5 after transposition are located on the same circumference.
[0031] As a specific implementation method of the transformer horn pad calculation method provided by the present invention, please refer to Figure 1 as well as Figure 2 The central angle of the outer wall of the outer diameter side horn pad 2 is α.
[0032] For details, please refer to Figure 1 as well as Figure 2 The center angle of the outer wall of the outer diameter side horn pad 2 is equal to the center angle of the tangent line on the inner diameter side of the transposed inner structure 3, both of which are α.
[0033] As a specific implementation method of the transformer horn pad calculation method provided by the present invention, please refer to Figure 1 as well as Figure 2 The thickness of the first end of the outer diameter side horn pad 2 with the largest thickness is equal to the thickness of the transposed conductor 5.
[0034] For details, please refer to Figure 1 as well as Figure 2 The first end of the outer diameter side horn pad 2 with the largest thickness is located at the transposition starting point of the transposition conductor 5, and the thickness of the first end of the outer diameter side horn pad 2 is equal to the thickness of the transposition conductor 5.
[0035] As a specific implementation method of the transformer horn pad calculation method provided by the present invention, please refer to Figure 1 as well as Figure 2The first end of the inner diameter side horn pad 1 and the first end of the outer diameter side horn pad 2 are located on the same radius of the internal structure 3, and the second end of the inner diameter side horn pad 1 and the second end of the thickness of the outer diameter side horn pad 2 are located on the same radius of the internal structure 3.
[0036] For details, please refer to Figure 1 as well as Figure 2 The central angle corresponding to the first end and the second end of the inner diameter side horn pad 1 coincides with the central angle corresponding to the first end and the second end of the outer diameter side horn pad 2.
[0037] As a specific implementation method of the transformer horn pad calculation method provided by the present invention, please refer to Figure 1 as well as Figure 2 , two endpoints and a midpoint are selected from the function expression of the wire lifting curve as fitting circles, which are used to calculate the inner / outer side walls of the inner diameter side horn pad 1 and the outer diameter side horn pad 2.
[0038] For details, please refer to Figure 1 as well as Figure 2 , select three points from the function expression of the wire lifting curve to make a fitting circle. The first end, the midpoint and the second end of the wire lifting curve can be selected. According to the coordinates of the three points obtained by calculation, the expression of the fitting circle is fitted, that is, the coordinates of the center of the fitting circle and the radius are obtained. The data of the fitting circle is used as the data of the outer wall of the inner diameter side horn pad 1, and the inner diameter side horn pad 1 and the outer diameter side horn pad 2 are produced.
[0039] As a specific implementation method of the transformer horn pad calculation method provided by the present invention, please refer to Figure 1 as well as Figure 2 For further information, please refer to Figure 1 as well as Figure 2 , the central angle of the transposed inner diameter side tangent on the internal structure 3 is α, r is the radius of the internal structure 3, (1).
[0040] The arc length of the inner wall of the inner diameter side horn pad 1 is L1, and the internal structure 3 of the transformer includes c groups of struts 4 evenly distributed in a circle. The inner diameter side horn pad 1 is erected on the outside of the strut 4, and the arc length of the inner diameter side horn pad 1 matches the strut 4. The arc length of the inner diameter side horn pad 1 is K strut spacings. The two ends of the inner diameter side horn pad 1 are respectively arranged on the outside of a group of struts 4, which increases the stability of the setting of the inner diameter side horn pad 1. The product of the total number c of struts 4 and the ratio of the central angle α of the inner wall of the inner diameter side horn pad 1 to the entire circumferential angle is the value K of the strut spacing required for the erection of the inner diameter side horn pad 1, and the K value is rounded up to increase the stability of the setting of the inner diameter side horn pad 1. K= (2).
[0041] The strut spacing K is calculated, and the inner diameter side horn pad 1 is installed on the outside of the K+1 group of struts 4. According to the ratio of the strut spacing K to the total number of struts 4 on the entire circumference, the center angle α of the inner diameter side horn pad 1 actually installed is determined, and the inner wall arc length L1 of the inner diameter side horn pad 1 actually installed is calculated.
[0042] Establish the radius and angle function of the wire lifting curve (i.e. the outer wall curve of the inner diameter side horn pad 1) L in polar coordinates , (3) The starting point of the wire lifting curve L ( , ), the starting point of the wire lifting curve L is tangent to the circle where the outer diameter of the internal structure 3 is located, and the end point of the wire lifting curve L ( , ) is tangent to the circle where the transposed conductor 5 is located after climbing, and the starting point of the conductor lifting curve L ( , ) coordinates, the end point of the wire lifting curve L ( , ) coordinates are substituted into Formula 3. The angle between the starting point and the end point of the wire lifting curve L is the central angle α of the inner diameter side horn pad 1 actually installed, and we get ; According to the curve that the wire follows with minimum energy change when bending, the material strain energy formula of the wire is obtained: , The size and material of the wire in Formula 8 are known, so the moment of inertia, elastic modulus, and moment of inertia in Formula 8 are all known; By combining equations 4 to 8, we can get the function expression of the wire lifting curve (i.e. the outer wall curve of the inner diameter side horn pad 1) L: .
[0043] The curve of the inner wall of the outer diameter side horn pad 2 is the function expression of the outer wall of the inner diameter side horn pad 1 plus the increased thickness of the transposed conductor 5 (the increased thickness of the winding is the product of the number of winding turns n and the thickness h of the transposed conductor 5). The function expression of the curve of the inner wall of the outer diameter side horn pad 2 is for, , The radius R of the circle where the curve of the outer wall of the outer diameter side horn pad 2 is located is, , The central angle corresponding to the curve of the outer wall of the outer diameter side horn pad 2 is α.
[0044] In the actual production process, It is not easy to mark the dimensions of the inner diameter side horn pad 1 and the outer diameter side horn pad 2 on the drawing, and it is not easy to provide guidance for the production process. On the wire lifting curve L, three points are selected, and the coordinates of these three points are fitted to obtain a fitting circle. The fitting circle is used for production guidance. The first end (x1, y1), midpoint (x3, y3) and second end (x2, y2) of the wire lifting curve can be selected. According to the coordinate values of the three selected points, the center coordinates of the fitting circle and the expression of the radius (x, y, r) are obtained. x=
[0045] y=
[0046] r=
[0047] The radius and arc length of the outer wall of the inner diameter side horn pad 1 and the inner wall of the outer diameter side horn pad 2 can be obtained.
[0048] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. A method for calculating transformer horn pads, characterized in that: The steps are as follows: S1. The transposed conductor is wound on the internal structure, an inner diameter side horn pad is arranged on the inner side of the transposed conductor, and the outer side wall of the inner diameter side horn pad fits the inner side wall of the transposed conductor, and an outer diameter side horn pad is arranged on the outer side of the transposed conductor, and the inner side wall of the outer diameter side horn pad fits the outer side wall of the transposed conductor; S2. Calculate the lifting distance h of the inner side wall of the transposed conductor at the second end where the thickness of the inner diameter side horn pad is the largest; S3, the inner wall of the transposed conductor is tangent to the outer circumference of the internal structure at the second end of the inner diameter side horn pad, and the central angle α of the transposed inner diameter side tangent on the internal structure is calculated; S4. Calculate the shortest transition distance of the outer wall of the transposed conductor at the transposition point according to the central angle α. At this time, the curve where the inner wall of the transposed conductor is located is the lifting curve of the transposed conductor. S5. Establish a function expression for the lifting curve of the inner wall of the transposed conductor when the central angle is α; S6. According to the function expression of the wire lifting curve, the relevant data of the inner wall and the outer wall of the inner diameter side horn pad and the outer diameter side horn pad are obtained.
2. A transformer horn spacer calculation method as claimed in claim 1, characterized in that: The function expression of the outer wall of the inner diameter side horn pad is consistent with the function expression of the lifting curve of the inner wall of the conductor, and the inner wall of the inner diameter side horn pad is an arc surface that fits the internal structure.
3. A transformer horn spacer calculation method as claimed in claim 1, characterized in that: The center angle of the inner wall of the inner diameter side horn pad is α.
4. A transformer horn spacer calculation method as claimed in claim 1, characterized in that: The thickness of the second end of the inner diameter side horn spacer is equal to the thickness of the transposed conductor.
5. A transformer horn spacer calculation method as claimed in claim 1, characterized in that: The difference between the function expression of the inner wall of the outer diameter side horn pad and the function expression of the outer wall of the inner diameter side horn pad is the thickness of the transposed wire winding.
6. A transformer horn spacer calculation method as claimed in claim 1, characterized in that: The outer wall of the outer diameter side horn pad is an arc surface, and its radius is equal to the radius of the transposed conductor after the transposition is completed.
7. A transformer horn spacer calculation method as claimed in claim 6, characterized in that: The central angle of the outer wall of the outer diameter side horn pad is α.
8. A transformer horn spacer calculation method as claimed in claim 1, characterized in that: The thickness of the first end of the outer diameter side horn pad with the largest thickness is equal to the thickness of the transposed conductor.
9. A transformer horn spacer calculation method as claimed in claim 1, characterized in that: The first end of the inner diameter side horn pad and the first end of the outer diameter side horn pad are located on the same radius of the internal structure, and the second end of the inner diameter side horn pad and the second end of the thickness of the outer diameter side horn pad are located on the same radius of the internal structure.
10. A transformer horn spacer calculation method according to claim 1, characterized in that: Two endpoints and a midpoint are selected from the function expression of the conductor lifting curve to make a fitting circle for calculating the inner / outer side walls of the inner diameter side horn pad and the outer diameter side horn pad.