Method and equipment for selecting cross section of transformer iron core

Abstract

The invention relates to the technical field of transformer iron cores, in particular to a transformer iron core section selection method and device.The method comprises the steps that firstly, the anti-short-circuit capacity requirement of the transformer iron core section is obtained, the section type of the transformer iron core section is determined according to the anti-short-circuit capacity requirement, and requirement parameters of the transformer iron core section are obtained; and determining all shape parameters of the cross section of the transformer iron core according to the cross section type and the required parameters. According to the method, firstly, the section type of the transformer iron core section is determined according to the capability requirement, and then all shape parameters of the transformer iron core section are determined according to the required parameters, so that the problem that a transformer iron core section selection method is lacked at present is solved.

Description

Technical Field

[0001] The invention relates to the technical field of transformer core technology, and in particular to a method and device for selecting the cross section of a transformer core. Background Art

[0002] The two major components of a transformer are the winding and the core. When the winding passes through an alternating current, a changing magnetic field will be generated; because the core is made of a highly permeable material, this magnetic field will be confined in the core, forming a magnetic circuit. The core converts the electrical energy of the transformer's primary circuit into magnetic energy, which is then converted into electrical energy in the secondary circuit and transmitted to the electrical equipment. The core is also the internal skeleton of the transformer, accounting for about 60% of the total weight in a dry transformer and about 40% of the total weight in an oil transformer. At the same time, the calculation of the core is also the starting point for transformer calculations, and a reasonable design of the core cross-section is particularly important for transformer design.

[0003] In the prior art, the cross section of the transformer core can only be determined based on the experience of employees, and there is a lack of a method for selecting the cross section of the transformer core. Summary of the invention

[0004] In view of this, an object of the present invention is to provide a method and device for selecting a transformer core cross section, so as to overcome the problem of the current lack of a method for selecting a transformer core cross section.

[0005] To achieve the above objectives, the present invention adopts the following technical solutions:

[0006] On the one hand, the present application provides a method for selecting a transformer core cross section, comprising:

[0007] Obtain the short-circuit resistance requirements of the transformer core cross-section;

[0008] Determining the cross-sectional type of the transformer core cross-sectional area according to the short-circuit resistance requirement;

[0009] Obtain the required parameters of the transformer core cross-section;

[0010] All shape parameters of the transformer core cross section are determined according to the cross section type and the required parameters.

[0011] Furthermore, in the method described above, the cross-section types include: circular cross-section, elliptical cross-section, oblong cross-section and elliptical-like cross-section.

[0012] Furthermore, in the method described above, the required parameters include: core capacity or core cross-sectional circumference.

[0013] Furthermore, in the above method, determining the cross-sectional type of the transformer core cross-section according to the short-circuit resistance requirement includes:

[0014] Obtaining the short-circuit resistance of different cross-section types;

[0015] According to the short-circuit resistance requirement, the cross-section type of the transformer core cross-section is determined.

[0016] Furthermore, in the above method, if the required parameter is the core capacity, the cross-sectional area of ​​the transformer core is determined according to the core capacity.

[0017] Furthermore, in the above method, determining all shape parameters of the transformer core cross section according to the cross section type and the required parameters includes:

[0018] Determine all shape parameters of the transformer core cross section according to the transformer core cross section area and the cross section type of the transformer core cross section;

[0019] Wherein, when the cross-section type is a circular cross-section, the radius of the circular cross-section of the transformer core is determined according to the cross-sectional area of ​​the transformer core;

[0020] When the cross-section type is an elliptical cross-section, the process conditions are obtained;

[0021] Determining the ratio of the major axis to the minor axis of the elliptical cross section according to the process conditions;

[0022] Determine the major axis and the minor axis of the elliptical cross section of the transformer core according to the cross-sectional area of ​​the transformer core and the ratio of the major axis to the minor axis of the elliptical cross section;

[0023] When the cross-section type is an oblong cross-section, the process conditions are obtained;

[0024] Determining the ratio of the length of the rectangular portion of the oblong cross section to the radius of the circular portion according to the process conditions;

[0025] Determine the length of the rectangular part and the radius of the circular part of the oblong cross-section of the transformer core according to the cross-sectional area of ​​the transformer core and the ratio of the length of the rectangular part to the radius of the circular part of the oblong cross-section;

[0026] When the cross-section type is a quasi-elliptical cross-section, the shape parameters of the quasi-elliptical cross-section of the transformer core are determined according to the cross-sectional area of ​​the transformer core and a calculation formula.

[0027] Further, in the above method, if the required parameter is the circumference of the core cross section, then determining all shape parameters of the transformer core cross section according to the cross section type and the required parameter includes:

[0028] According to the cross-section type, a calculation formula is determined;

[0029] All shape parameters of the transformer core cross section are calculated according to the calculation formula and the core cross section perimeter.

[0030] Furthermore, in the above method, determining the cross-sectional type of the transformer core cross-section according to the short-circuit resistance requirement includes:

[0031] Obtain customer cost requirements;

[0032] The cross-sectional type of the transformer core cross-section is determined according to the customer cost requirement and the short-circuit resistance requirement.

[0033] Furthermore, in the above method, the step of calculating all shape parameters of the transformer core cross section according to the calculation formula and the core cross section perimeter includes:

[0034] All shape parameters of the transformer core cross section are calculated based on the calculation formula, the core cross section perimeter and customer cost requirements.

[0035] On the other hand, the present application provides a transformer core cross-section selection device, including a processor and a memory, wherein the processor is connected to the memory:

[0036] Wherein, the processor is used to call and execute the program stored in the memory;

[0037] The memory is used to store the program, and the program is at least used to execute any of the above transformer core cross-section selection methods.

[0038] The beneficial effects of the present invention are:

[0039] The present application first obtains the short-circuit resistance requirement of the transformer core cross section, determines the cross-sectional type of the transformer core cross section according to the short-circuit resistance requirement, obtains the required parameters of the transformer core cross section, and determines all shape parameters of the transformer core cross section according to the cross-sectional type and the required parameters. In the present application, the cross-sectional type of the transformer core cross section is first determined according to the capability requirement, and then all shape parameters of the transformer core cross section are determined according to the required parameters, thereby solving the problem of the current lack of a method for selecting the transformer core cross section. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, 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.

[0041] Figure 1It is a flow chart provided by an embodiment of a method for selecting a transformer core cross section of the present invention;

[0042] Figure 2 It is a schematic diagram of structures of different cross-section types provided by an embodiment of a method for selecting a transformer core cross-section of the present invention;

[0043] Figure 3 It is a structural schematic diagram of an elliptical cross-section provided by an embodiment of a method for selecting a transformer core cross-section of the present invention;

[0044] Figure 4 A comparison diagram of cross-sectional areas of different cross-sectional types with equal perimeters provided by an embodiment of a method for selecting a cross-sectional area of ​​a transformer core of the present invention;

[0045] Figure 5 It is a structural schematic diagram provided by an embodiment of a transformer core cross-section selection device of the present invention. DETAILED DESCRIPTION

[0046] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0047] Figure 1 This is a flowchart provided by an embodiment of a method for selecting a transformer core cross section of the present invention. Figure 1 , this embodiment may include the following steps:

[0048] S1. Obtain the short-circuit resistance requirements of the transformer core cross-section.

[0049] S2. Determine the cross-sectional type of the transformer core according to the short-circuit resistance requirements.

[0050] S3. Obtain the required parameters of the transformer core cross section.

[0051] S4. Determine all shape parameters of the transformer core cross section based on the cross section type and required parameters.

[0052] It can be understood that in this embodiment, the short-circuit resistance requirement of the transformer core section is first obtained, and the cross-sectional type of the transformer core section is determined according to the short-circuit resistance requirement, and the required parameters of the transformer core section are obtained, and all shape parameters of the transformer core section are determined according to the cross-sectional type and the required parameters. In this embodiment, the cross-sectional type of the transformer core section is first determined according to the capacity requirement, and then all shape parameters of the transformer core section are determined according to the required parameters, thereby solving the problem of the current lack of a method for selecting a transformer core section.

[0053] Preferably, the cross-section types include: circular cross-section, elliptical cross-section, oblong cross-section and elliptical cross-section.

[0054] Preferably, the required parameters include: core capacity or core cross-sectional circumference.

[0055] Preferably, step S2 comprises:

[0056] Obtain the short-circuit resistance of different cross-section types;

[0057] Determine the cross-sectional type of the transformer core according to the short-circuit resistance requirements.

[0058] It can be understood that under similar conditions, the short-circuit resistance capacity of circular cross-section>elliptical cross-section>quasi-elliptical cross-section>oblong cross-section.

[0059] Preferably, if the required parameter is the core capacity, the transformer core cross-sectional area is determined according to the core capacity.

[0060] Preferably, step S4 comprises:

[0061] Determine all shape parameters of the transformer core section according to the transformer core cross-sectional area and the cross-sectional type of the transformer core section;

[0062] When the cross-section type is a circular cross-section, the radius of the circular cross-section of the transformer core is determined according to the cross-sectional area of ​​the transformer core;

[0063] When the section type is an elliptical section, the process conditions are obtained;

[0064] Determine the ratio of the major axis to the minor axis of the elliptical cross section according to process conditions;

[0065] Determine the major axis and minor axis of the elliptical cross section of the transformer core according to the cross-sectional area of ​​the transformer core and the ratio of the major axis to the minor axis of the elliptical cross section;

[0066] When the section type is an oblong section, the process conditions are obtained;

[0067] Determine the ratio of the length of the rectangular portion of the long circular cross section to the radius of the circular portion according to the process conditions;

[0068] Determine the length of the rectangular part and the radius of the circular part of the oblong section of the transformer core according to the cross-sectional area of ​​the transformer core and the ratio of the length of the rectangular part of the oblong section to the radius of the circular part;

[0069] When the cross-section type is a quasi-elliptical cross-section, the shape parameters of the quasi-elliptical cross-section of the transformer core are determined based on the cross-sectional area of ​​the transformer core and the calculation formula.

[0070] It is understandable that if Figure 2 As shown, for a circular cross section, the core diameter is selected Where K: empirical coefficient P: single column capacity; the K value of small and medium-sized oil-immersed transformers is about 50-60. After calculating the diameter, design a mold with the same diameter according to the circular cross-section. This cross-section has a relatively low space utilization rate, and the oil tank and oil are relatively high. Under the same level, the core filling rate of this cross-section is low; compared with other cross-sections, because the column area and iron yoke area of ​​the circular cross-section are both circles with larger diameters, the overall size of the core becomes larger, the yoke and column pieces become longer, and the weight of the core increases greatly. Under the same conditions, the low voltage needs to be adjusted, which will eventually make iron and copper heavier and more expensive than other cross-section types.

[0071] Regarding the elliptical cross-section, with the development of transformers, elliptical cross-sections have appeared on the market. The short axis direction of this type of cross-section is shorter than the diameter of the circle, the overall length and height of the core will be lower than the circle, the weight will be less than the circle, and the cost will be lower than the circular cross-section. The coil is in the shape of an arc as a whole, which has good short-circuit resistance, but the tips on both sides of the elliptical long axis are more prominent, and the ratio of the long and short axes cannot be too large. The ratio of the long axis to the short axis is more appropriate at 1.3 to 1.4. When selecting the cross-section, first calculate the diameter D according to the selection method of the circular cross-section, and then use the diameter to calculate the cross-sectional area S. After determining the area, select the length-to-width ratio suitable for your own process conditions, and then calculate the long and short axis dimensions a and b, and then convert the elliptical cross-section into a mold. The elliptical arc is not easy to design and process, and the mold cost is high. In addition, there are better cross-section selections, so this type of cross-section is less available on the market.

[0072] For the long circular section, this type of section introduces a straight section d, and the core filling rate of the straight section is 100%. The overall filling rate is relatively high, and the amount of silicon steel, excitation wire, oil, and iron used are relatively low. Under the same conditions, the longer the straight section is, the lower the cost is. However, the longer the straight section is, the smaller the constraint is, and the worse the short-circuit resistance is. The ratio of the major axis to the minor axis is more appropriate to be 1.5 to 2.0. The values ​​taken by each manufacturer are also different according to the actual production situation, process conditions, and tightening measures. After the low-voltage winding of the coil of this cross-section is completed, the straight section will arch up due to the expansion force. It is necessary to press and shape the low-voltage coil first to make the low-voltage coil fit the mold; after drying and shaping, the high-voltage coil can be wound. After the high-voltage coil is wound, it is still necessary to complete another press-fit drying operation. When designing the section, the K value can be appropriately enlarged when calculating the diameter area according to the circle. At present, copper is more expensive and silicon steel is cheaper in the market. When the transformer capacity is larger, the K value can be taken to about 65, and the method of more iron and less copper is adopted to achieve the purpose of cost reduction. Such as Figure 1 As shown, according to your own production conditions, a ratio of the long and short axes is initially set, and d and r1 have a functional relationship. Then use the initially calculated circular diameter D to calculate the area S. S is known, d and r1 can be transformed into an unknown quantity, and the values ​​of d and r1 can be calculated. Then the mold drawing is converted according to the cross section.

[0073] For the elliptical cross section, which is composed of two identical small arcs and two identical large arcs that are tangent to each other, the variables arc height h, rectangle thickness d1 and small circle radius r2 are introduced; Figure 3 As shown, the length of the rectangle = the diameter of the small circle = 2×r2, where the functional relationship is:

[0074] L2=R-r2

[0075] L1 = R - half the length of the rectangle - arc height h = R - r2 - h

[0076] The formula for the length of the side of a right triangle is:

[0077] The radius R of the great circle and the angle and radian value of the angle θ can be calculated through trigonometric and inverse trigonometric functions.

[0078] like Figure 1As shown, the arc height h, moment thickness d1, and small circle radius r2 are our given values. We still look at it from the perspective of the long circle section. During the production process of the long circle coil, it will be found that the straight line part d will bulge into an arc shape due to the expansion force. At this time, we press the arc to ensure that the later package can be set on the long circle core section. If it is not pressed, find a way to fill the bulging arc, and there is no need to dry and press. According to production practice, the arch height of the straight line part under different capacities is measured. In our design stage, we design the arc height of this bulge according to the actual production bulging height. In this way, the elliptical design can also be equivalent to the long circle plus the arc starting height, and then the winding arc surface is optimized and calculated as the state of the large and small arcs being tangent. The arc height is between 6 and 25 depending on the capacity. The aspect ratio is based on the long circle. The arc height is increased, and the ratio is reduced. It is recommended to take a value below 1.6 to ensure that the coil has a strong ability to resist short circuits. The h value is given according to the capacity and actual production conditions. The functional relationship between d1 and r2 is established according to the aspect ratio. The circle diameter D is initially calculated to determine the area S. The d1 and r2 values ​​are calculated according to the conditions.

[0079] It should be noted that the above aspect ratios are calculated based on the ratios of the boundaries of mathematical figures. There will be gaps when actually stacking the sheets, especially on both sides of the long axis due to the limitation of the minimum sheet width of the cut sheets, there will be larger gaps. In this way, the ratio of the actual cumulative thickness to width of the stacked sheets will be smaller than the ratio of the above aspect ratios.

[0080] In actual practice, the core is made of stacked cores to form the above cross-sectional shape. According to the principle of calculus, the circle is divided into countless cuboids. The more cuboids there are, that is, the more cores there are, the larger the cross-sectional area of ​​the stacked cores.

[0081] The coordinates of the intersection of the rectangle and the circle are: (x1, y1), (x2, y2), (x3, y3)...(x n ,y n )

[0082] The total area of ​​the rectangle in the four quadrants is: 4×x1×y1, 4×x2×(y2-y1), 4×x n ×(y n -y n-1 )

[0083] So the core cross-sectional area is equal to:

[0084] However, the core section cannot be infinitely divided. If there are too many levels, it will increase the difficulty of cutting and the time of lamination. According to the different capacity sections, the number of levels is generally 6 to 16. The arc of the minor axis of ellipse and quasi-ellipse is gentle. If you want to have a larger magnetic flux area, the number of filling levels should be more than that of circle and oblong.

[0085] Circle(x2 +y 2 =r 2 ,r is given when designing), ellipse ( a, b are given during design) to establish a coordinate system based on the curve equation, and then give the width of each level (2x n ) to calculate the intersection coordinates and then calculate the stacking thickness of each level. For ellipse-like, two arc equations need to be established to calculate the intersection coordinates (x, y). When the sheet width coordinate is less than x, the middle arc curve equation is used to calculate the stacking thickness; when the sheet width coordinate is greater than x, the end arc curve equation is used to calculate the stacking thickness.

[0086] In some optional embodiments, programming can be performed through EXCAL; by adding some restrictions, data selection and equation transformation can be completed; data listing can be completed in EXCAL, and functional relationships between data can be established, so that we can see the changes of raw materials and some transformer performance parameters more clearly and intuitively.

[0087] Preferably, if the required parameter is the perimeter of the core cross section, step S4 includes: determining a calculation formula according to the cross section type;

[0088] According to the calculation formula and the circumference of the core section, all shape parameters of the transformer core section are calculated.

[0089] Preferably, step S2 includes: obtaining customer cost requirements;

[0090] Determine the cross-sectional type of the transformer core according to customer cost requirements and short-circuit resistance requirements.

[0091] Preferably, step S4 comprises:

[0092] Calculate all shape parameters of the transformer core section based on the calculation formula, core section circumference and customer cost requirements.

[0093] It is understandable that if Figure 1 As shown, the circumference of the circular section is: L = π[3 / 2(a+b)-√(ab)]——①

[0094] Area: S1 = πr 2 ——②

[0095] ∴

[0096] L: circumference S1: cross-sectional area r: radius of the circle

[0097] Perimeter of pure ellipse section: L = 2πa + 4(ba)——③

[0098] Area: S2 = πab——④

[0099] From ①③, we get a+b=2r∴S2=πa(2r-a)=-πa 2 +π2ar

[0100] ∴S2=-π(ar)2+πr 2 {0<a<2r and a≠r}

[0101] When a is closer to r, the area becomes larger, and the area is approximately close to πr 2 ∴0<S2<πr2

[0102] Perimeter of oblong cross section: L = 2πr1 + 2d——⑤

[0103] Area: S3 = πr12 + 2dr1 - ⑥

[0104] From ⑤⑥, we get S3=-πr12+Lr1Substitute ① into

[0105] S3=-π(r12-2r1)=-π(r1-r)2+πr 2 {0<r1<r}

[0106] When r1 is closer to r, the area becomes larger, and the area is approximately close to πr 2 , at this time d approaches 0

[0107] ∴0<S3<πr 2 Right now

[0108] When the shape is ellipse-like, too many variables are introduced and cannot be compared through functions. At the same time, because the variables introduced by ellipses, elongated circles and ellipse-like shapes are inconsistent, intuitive function comparison is also impossible.

[0109] In practice, if we set a circle with a radius of 50 and a diameter of 100, the circumference is 100×π=314.2, and the area of ​​the circle is approximately equal to 7854. Let the circumference of the ellipse, oblong, and ellipse-like be equal to the circumference of the circle with a diameter of 100, and then Figure 1 Introduce variables to ensure that the lengths of ellipses, oblongs, and quasi-ellipses along the y-axis are consistent, and compare the areas of several figures:

[0110] For a circular cross section, the area is constant and equal to 7854.

[0111] For the elliptical cross section, the short axis half a is introduced, and the long axis half b is calculated according to the circumference. Then, different areas are calculated according to the changes of a and b, as shown in Table 1.

[0112] Table 1 Shape parameters of elliptical sections with equal perimeters

[0113] perimeter Minor axis half a Long axis half b Ellipse area Y-axis length 314.2 50 50.0 7854.0 100.0 314.2 48 52.0 7833.9 103.9 314.2 46 53.9 7782.0 107.7 314.2 44 55.7 7692.5 111.3 314.2 42 57.4 7573.8 114.8 314.2 40 59.1 7423.0 118.1 314.2 38 60.7 7243.4 121.4 314.2 36 62.2 7035.8 124.4 314.2 34 63.7 6804.1 127.4 314.2 32 65.1 6544.6 130.2 314.2 30 66.4 6259.9 132.8

[0114] For the long circular cross section, the straight line segment d is introduced, and the circular radius r1 is calculated according to the circumference. Different areas are calculated according to the changes of d and r1, as shown in Table 2.

[0115] Table 2 Shape parameters of different oblong sections with equal perimeter

[0116] perimeter Straight line part d Circle radius r1 Area of ​​oblong circle Y-axis length 314.2 10 46.8 7822.2 103.6 314.2 15 45.2 7782.4 105.5 314.2 20 43.6 7726.7 107.3 314.2 25 42.0 7655.0 109.1 314.2 30 40.5 7567.5 110.9 314.2 35 38.9 7464.1 112.7 314.2 40 37.3 7344.7 114.5 314.2 45 35.7 7209.4 116.4 314.2 50 34.1 7058.2 118.2 314.2 55 32.5 6891.1 120.0 314.2 60 30.9 6708.1 121.8 314.2 65 29.3 6509.1 123.6 314.2 70 27.7 6294.3 125.4

[0117] For elliptical cross-sections, a fixed arc height h, varying d1 and r2 are introduced, and different areas are calculated according to the changes of d1 and r2, as shown in Table 3.

[0118] Table 3 Shape parameters of different types of elliptical sections with equal perimeter

[0119]

[0120] If the circle is stretched along the y-axis, the figure will be similar to an ellipse, an oblong, and a quasi-ellipse; we compare the areas of the three under myopia conditions (equal y-axis lengths), see Figure 4 As can be seen from the figure, when the circumference is constant, the circular cross-sectional area of ​​the circle is greater than the elliptical cross-sectional area, the quasi-elliptical cross-sectional area, and the oblong cross-sectional area.

[0121] The cost accounting is compared with the national standard loss of 3150KVA and S11 type; when designing the oblong and quasi-elliptical shapes, the cross-sectional area, the dimensions in the long axis direction, the number of low-voltage turns, the dimensions of the high and low voltage wires, the design margin, and the loss values ​​are kept consistent; when designing the circular cross-section, the weight of the core is greatly increased, and the no-load cannot be used due to the increase in the no-load, so only the loss is guaranteed, and the cross-section, wire, and silicon steel sheet brand are freely designed. When designing a pure elliptical shape, the center distance increases, the amount of core used and the no-load increase, and the cross-section needs to be appropriately increased to ensure no-load consistency. After the calculation is completed, it is found that the cost of the circular cross-section of this capacity is 1.110 times the cost of the oblong cross-section, the cost of the elliptical cross-section is 1.051 times the cost of the oblong cross-section, and the cost of the quasi-elliptical cross-section is 1.012 times the cost of the oblong cross-section. (The performance of the silicon steel sheet used in the circular cross section of this calculation scheme is one level higher than that of the silicon steel sheet used in the ellipse, oblong, and quasi-ellipse. If the energy efficiency level is high and the same type of silicon steel sheet is used for all, the cost difference between the circular and quasi-ellipse will be greater.) The main difference between the quasi-ellipse and oblong is the weight of the fuel tank, oil, and silicon steel sheet; Figure 4 It can be seen that the ellipse has a larger area under the same circumference, and the oblong has a longer circumference under the same area. Also, because the weight of the ellipse core is slightly increased, the cross-section can be slightly increased to compensate for the increased no-load loss, so that the weight of the wires of the two are almost equal.

[0122] The circular structure winding has the strongest ability to withstand radial short circuits, and has the shortest circumference under the same cross-section, but the cost is the highest. The long axis of the pure elliptical mold is sharp, the mold is not easy to make, and the cost is higher than that of the quasi-ellipse and the long circle. The long circle has the best cost, but the short-circuit resistance is poor, and the low voltage must be pressed and dried separately during winding. The cost of the quasi-ellipse is slightly higher than that of the long circle, and the radial short-circuit resistance is stronger than that of the long circle section. When designing a transformer, the designer should choose the appropriate core section according to his actual production conditions and process conditions.

[0123] The present invention also provides a transformer core cross-section selection device for implementing the above method embodiment. Figure 5 This is a schematic diagram of a structure provided by an embodiment of a transformer core cross-section selection device of the present invention. Figure 5 As shown, the transformer core section selection device of this embodiment includes a processor 21 and a memory 22, and the processor 21 is connected to the memory 22. The processor 21 is used to call and execute the program stored in the memory 22; the memory 22 is used to store the program, and the program is at least used to execute the transformer core section selection method in the above embodiment.

[0124] The specific implementation scheme of the transformer core cross-section selection device provided in the embodiment of the present application can refer to the implementation scheme of the transformer core cross-section selection method in any of the above embodiments, which will not be repeated here.

[0125] It can be understood that the same or similar parts of the above embodiments can be referenced to each other, and the contents not described in detail in some embodiments can refer to the same or similar contents in other embodiments.

[0126] It should be noted that, in the description of the present invention, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, in the description of the present invention, unless otherwise specified, the meaning of "plurality" refers to at least two.

[0127] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code that includes one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present invention includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by those skilled in the art to which the embodiments of the present invention belong.

[0128] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, a plurality of steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0129] A person skilled in the art may understand that all or part of the steps in the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment.

[0130] In addition, each functional unit in each embodiment of the present invention may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0131] The storage medium mentioned above can be a read-only memory, a magnetic disk or an optical disk, etc.

[0132] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0133] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A method for selecting a transformer core cross section, characterized in that: include: Obtain the short-circuit resistance requirements of the transformer core cross-section; Determining the cross-sectional type of the transformer core cross-section according to the short-circuit resistance requirement; Obtain the required parameters of the transformer core cross-section; All shape parameters of the transformer core cross section are determined according to the cross section type and the required parameters.

2. The method according to claim 1, characterized in that The cross-section types include: circular cross-section, elliptical cross-section, oblong cross-section and elliptical cross-section.

3. The method according to claim 2, characterized in that The required parameters include: core capacity or core cross-sectional circumference.

4. The method according to claim 3, characterized in that: Determining the cross-section type of the transformer core cross-section according to the short-circuit resistance requirement includes: Obtaining the short-circuit resistance of different cross-section types; According to the short-circuit resistance requirement, the cross-section type of the transformer core cross-section is determined.

5. The method according to claim 4, characterized in that If the required parameter is the core capacity, the cross-sectional area of ​​the transformer core is determined according to the core capacity.

6. The method according to claim 5, characterized in that Determining all shape parameters of the transformer core cross section according to the cross section type and the required parameters includes: Determine all shape parameters of the transformer core cross section according to the transformer core cross section area and the cross section type of the transformer core cross section; Wherein, when the cross-section type is a circular cross-section, the radius of the circular cross-section of the transformer core is determined according to the cross-sectional area of ​​the transformer core; When the cross-section type is an elliptical cross-section, the process conditions are obtained; Determining the ratio of the major axis to the minor axis of the elliptical cross section according to the process conditions; Determine the major axis and the minor axis of the elliptical cross section of the transformer core according to the cross-sectional area of ​​the transformer core and the ratio of the major axis to the minor axis of the elliptical cross section; When the cross-section type is an oblong cross-section, the process conditions are obtained; Determining the ratio of the length of the rectangular portion of the oblong cross section to the radius of the circular portion according to the process conditions; Determine the length of the rectangular part and the radius of the circular part of the oblong cross-section of the transformer core according to the cross-sectional area of ​​the transformer core and the ratio of the length of the rectangular part to the radius of the circular part of the oblong cross-section; When the cross-section type is a quasi-elliptical cross-section, the shape parameters of the quasi-elliptical cross-section of the transformer core are determined according to the cross-sectional area of ​​the transformer core and a calculation formula.

7. The method according to claim 6, characterized in that If the required parameter is the circumference of the core cross section, then determining all shape parameters of the transformer core cross section according to the cross section type and the required parameter includes: According to the cross-section type, a calculation formula is determined; All shape parameters of the transformer core cross section are calculated according to the calculation formula and the core cross section perimeter.

8. The method according to claim 7, characterized in that Determining the cross-section type of the transformer core cross-section according to the short-circuit resistance requirement includes: Obtain customer cost requirements; The cross-sectional type of the transformer core cross-section is determined according to the customer cost requirement and the short-circuit resistance requirement.

9. The method according to claim 8, characterized in that The step of calculating all shape parameters of the transformer core cross section according to the calculation formula and the core cross section perimeter includes: All shape parameters of the transformer core cross section are calculated based on the calculation formula, the core cross section perimeter and customer cost requirements.

10. A transformer core cross-section selection device, characterized in that: The invention comprises a processor and a memory, wherein the processor is connected to the memory: Wherein, the processor is used to call and execute the program stored in the memory; The memory is used to store the program, and the program is at least used to execute the transformer core cross-section selection method described in any one of claims 1-9.

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