A multi-voltage class transformer and method of winding

Abstract

The application discloses a winding method of a multi-voltage-grade transformer, the transformer comprising a core, a first winding and a second winding, the method comprising: obtaining voltage differences between adjacent voltage grades in the multi-voltage-grade transformer, and obtaining a minimum voltage difference ΔU from the voltage differences min ; determining the number of turns of each winding section according to the minimum voltage difference ΔU, wherein the first winding and / or the second winding has a first winding section and a plurality of second winding sections, and the number of turns of at least one second winding section is one turn, wherein U n is an input voltage and / or an output voltage grade of the transformer; winding the first winding on the core by a first wire according to the number of turns of each winding section, and winding the second winding on the core by a second wire according to the number of turns of each winding section. In the application, the number of turns of part or all of the second winding sections is limited to one, which greatly reduces the risk of over-winding or under-winding, and improves winding efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of transformers, in particular to a multi-voltage grade transformer and a winding method. BACKGROUND

[0002] A transformer is a device for changing AC voltage by using the principle of electromagnetic induction, and the main components are a primary coil, a secondary coil and a core (magnetic core). The primary coil and the secondary coil are both formed by winding the surface-insulated wire along the core. The turns ratio of the primary coil and the secondary coil directly affects the transformation ratio of the transformer. The winding personnel needs to strictly ensure the correct number of turns during the winding process. If the winding personnel incorrectly increases or decreases the number of turns of the primary coil or the secondary coil, it will change the transformation ratio of the transformer and affect the performance of the transformer. Especially for multi-voltage grade transformers, the number of coils to be wound is large, and it is more likely to occur that the number of turns of the coil is wound too much or too little. SUMMARY

[0003] The purpose of the present application is to overcome the above-mentioned defects or problems existing in the background art, and to provide a multi-voltage grade transformer which can facilitate the winding of the primary winding and / or the secondary winding having multiple taps, and the different section coils of the tap position will not be separated from each other.

[0004] To achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0005] Technical solution one: a winding method of a multi-voltage grade transformer, the transformer comprising a core, a first winding and a second winding, characterized in that the method comprises: obtaining the voltage difference between adjacent voltage grades in the multi-voltage grade of the transformer, and obtaining the minimum voltage difference ΔU min in the multiple voltage differences; determining the number of turns of each winding section according to , wherein the first winding and / or the second winding has a first winding section and a plurality of second winding sections, and the number of turns of at least one second winding section is 1 turn, wherein U n is the input voltage and / or output voltage grade of the transformer; winding the first winding on the core by the first wire according to the number of turns of each winding section, and winding the second winding on the core by the second wire.

[0006] Technical solution two, based on technical solution one: after determining the number of turns of each winding section according to , further comprising determining the parameters of the core of the transformer according to 4.44*Ae*Bm*f=ΔU min , wherein Ae is the diameter of the core, Bm is the magnetic flux density of the core, and f is the working frequency.

[0007] Three, based on technical solution one: the second winding formed by the second wire winding on the core, specifically includes, in addition to the last second winding segment, the number of turns of the second wire winding on the core meets the number of turns of the first winding segment or the number of turns of the second winding segment, by the winding end of the second wire outwardly extending and reversing back to make the connection position of the two winding segments form a tap, the beginning end, the end and each tap of the second wire are adapted to form multiple voltage levels for external wiring.

[0008] Four, based on any one of technical solutions one to three: further comprising arranging the first winding segment along the core column axis of the second winding, and arranging a plurality of second winding segments outside the first winding segment and spaced along the core column axis of the second winding.

[0009] Five, based on any one of technical solutions one to three: each tap is located on the same side of the second winding and spaced along the core column axis of the second winding.

[0010] Six, based on technical solution five: the first winding and the second winding are wound in the same core column from inside to outside.

[0011] Seven, based on technical solution six: the first winding and the second winding are wound in the same core column in an up-down distribution manner, or are wound in two core columns respectively.

[0012] Eight: a multi-voltage level transformer wound according to any one of the above technical solutions one to seven.

[0013] Nine, based on technical solution eight: further comprising a support and a plurality of connecting members for external wiring; the core is fixedly installed on the support, and the connecting members are fixedly installed on the support and connected with the beginning end and the end of the first coil, the beginning end and the end of the second coil, and a plurality of taps.

[0014] Ten, based on technical solution nine: the connecting member is connected with the corresponding tap through a terminal post, and the tap is divided to form two wiring ends, which are respectively connected with two terminal posts.

[0015] From the above description of the present application, compared with the prior art, the present application has the following beneficial effects:

[0016] 1. In technical solution one, the multi-voltage level transformer winding method obtains the voltage difference between adjacent voltage levels in the multi-voltage level transformer, and obtains the minimum voltage difference ΔU min ; according to The number of turns of each winding section is determined, and the number of turns of at least one second winding section is determined as one turn. Whether the coil is one turn can be determined by the winding personnel at a glance, and it is not necessary to determine the number of turns by counting the number of turns, which greatly reduces the risk of over-winding or under-winding and improves winding efficiency.

[0017] 2、In the third technical solution, the second winding of the transformer is wound with only one wire, and in the winding process, a plurality of taps are formed by extending outward and winding back in the opposite direction without interrupting the winding of the second winding. The taps can cooperate with the beginning and end of the wire, so that the transformer can have multiple voltage levels. Since the second winding has no interrupted part during winding, it is a continuous winding, so there is no connection between the wires, and the winding is simple. When the number of turns of the second winding section is one, the coil will not be easily detached due to too small number of turns.

[0018] 3、In the fourth technical solution, the remaining winding sections except the first winding section of the second winding are wound outside the first winding section, so that the remaining winding sections can maintain a large distance between them, facilitating the external wiring of the taps.

[0019] 4、In the fifth technical solution, the taps are arranged on the same side of the second winding, which facilitates the external wiring of the taps from the same angle by the engineering personnel, and the operation is simple.

[0020] 5、In the eighth technical solution, the protection is for the transformer wound by any one of the above technical solutions one to seven, which naturally inherits the effects of the corresponding technical solutions.

[0021] 6、In the ninth technical solution, the transformer further comprises a support and a connecting piece, and the iron core and the wiring end are fixed by the support and the connecting piece, which can avoid the coil from detaching after winding in the manufactured transformer.

[0022] 7、In the tenth technical solution, the tap at the connection position is divided into two wiring ends, and the two wiring ends are connected to two wiring posts of the connecting piece, which facilitates external wiring and is symmetrical and beautiful. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings needed in the embodiment description. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0024] Figure 1 The transformer structure provided for embodiment 1 of the present application Figure 1 ;

[0025] Figure 2 Transformer structure provided for embodiment 1 of the present application Figure 2 ;

[0026] Figure 3 Transformer winding circuit schematic provided for embodiment 1 of the present application

[0027] Figure 4 Transformer configuration schematic provided for embodiment 1 of the present application Figure 1 ;

[0028] Figure 5 Transformer configuration schematic provided for embodiment 1 of the present application Figure 2 ;

[0029] Figure 6 Transformer structure diagram provided for embodiment 2 of the present application

[0030] Figure 7 Transformer structure provided for embodiment 2 of the present application Figure 2 .

[0031] Explanation of main reference numerals:

[0032] Core 1; first winding 2; second winding 3; first wire 4; second wire 5; tap 6; support 7; connecting piece 8; terminal post 9. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are preferred embodiments of the present application, and should not be regarded as exclusion of other embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative effort fall within the scope of protection of the present application.

[0034] In the claims, specification, and above drawings of the present application, unless otherwise explicitly limited, as using the terms "first", "second", or "third" and the like, are intended to distinguish different objects, and are not used to describe a particular order.

[0035] In the claims, specification, and above drawings of the present application, unless otherwise explicitly limited, as using the terms "center", "transverse", "longitudinal", "horizontal", "vertical", "top", "bottom", "inner", "outer", "upper", "lower", "front", "back", "left", "right", "clockwise", "counterclockwise", and the like indicate the orientation or positional relationship based on the orientation and position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation or be constructed and operated in a particular orientation, so it cannot be understood as limiting the specific protection scope of the present application.

[0036] In the claims, the specification, and the drawings of the present application, terms such as "fixedly connected" or "connected" should not be construed as necessarily limiting, unless expressly so defined in the claims. "Fixedly connected" or "connected" means that the two components are connected without relative displacement and relative rotation, that is, it includes fixedly connected, detachably fixedly connected, integrated, and fixedly connected through other devices or elements.

[0037] In the claims, the specification, and the drawings of the present application, terms such as "including", "having" and their variants should be construed as "including but not limited to".

[0038] Example 1

[0039] Referring to Figure 1 and Figure 2 , the embodiment of the present application provides a transformer, which includes a support 7, a plurality of connecting pieces 8 and a transformer assembly.

[0040] Referring to Figure 3 , which shows a circuit schematic diagram of a multi-voltage level transformer assembly provided by the embodiment of the present application, and referring to Figure 4 or Figure 5 , the transformer assembly includes a core 1, a first winding 2 and a second winding 3. The transformer assembly is used as a core component in the transformer, and is combined to form the transformer. In the embodiment, the transformer is a three-phase transformer. In other embodiments, the transformer can also be a single-phase transformer, or a three-phase to single-phase or single-phase to three-phase transformer.

[0041] Among them, Figure 4 and Figure 5 show two different winding forms, in Figure 4 , the first winding 2 and the second winding 3 are wound on two core columns respectively. In Figure 5 , the first winding 2 and the second winding 3 are wound on the same core column in a top-down distribution manner. Alternatively, as another optional embodiment, the first winding 2 and the second winding 3 can also be wound on the same core column in an inside-outside manner. The winding form shown in Figure 4 is adopted in the embodiment, but in other embodiments, the winding form shown in Figure 5 or other winding forms can also be adopted, which are not limited here.

[0042] The first winding 2 is formed by winding the first wire 4 around the core 1, and the second winding 3 is formed by winding the second wire 5 around the core 1. The second wire 5 is wound by extending outward and reversing back to form a plurality of taps 6 between the beginning end and the end of the second wire 5, and the beginning end, the end and each tap 6 of the second wire 5 are adapted to be externally connected. The first wire 4 and the second wire 5 are both enameled wires.

[0043] Specifically, regardless of the winding form of each winding in the transformer assembly and the specific configuration of the core 1, in the transformer, the primary winding and the secondary winding have a clear meaning, and they cooperate with each other to change the first voltage input on one side of the primary winding into the second voltage output on one side of the secondary winding by using the principle of electromagnetic induction. In this embodiment, a plurality of taps 6 are also provided in the secondary winding, so that the secondary winding can realize voltage output of multiple gears by changing the connection position. The core 1 is made of materials such as silicon steel sheets or nickel-iron alloy sheets, and is used to provide a magnetic circuit, conduct a magnetic field and transmit electrical energy from one coil to another coil, and realize the conversion between electrical energy and magnetic energy under the action of an alternating magnetic field. The core usually includes core columns and a yoke, the core columns are the parts inside the core for winding the primary and secondary coils of the transformer, and the coils are wrapped around these core columns. The yoke connects the core columns to form a closed magnetic circuit, ensuring that the magnetic flux does not overflow outside the core 1, and reducing the loss of magnetic flux leakage. Generally, the core 1 can adopt a core type structure or a shell type structure, which is not limited here.

[0044] It should be noted that in the present application, the first winding 2 can correspond to the primary winding of the transformer, or can correspond to the secondary winding of the transformer. Similarly, when the first winding 2 is the primary winding of the transformer, the second winding 3 is the secondary winding of the transformer, and when the first winding 2 is the secondary winding of the transformer, the second winding 3 is the primary winding of the transformer. When the second winding 3 is the secondary winding of the transformer, the secondary winding is provided with a plurality of taps, and the primary winding only includes a beginning end and an end. At this time, the second winding serves as the output terminal of the transformer assembly and can output voltages of multiple gears; when the second winding 3 is the primary winding of the transformer, the primary winding is provided with a plurality of taps, and the secondary winding only includes a beginning end and an end. At this time, the second winding serves as the input terminal of the transformer assembly and can input voltages of multiple gears and output the same voltage. Alternatively, both the primary winding and the secondary winding are provided with a plurality of taps, in which case the positions connected by the input voltage and the output voltage can be selected according to actual needs to obtain the required number of voltage transformation stages. Hereinafter, the second winding 3 is taken as the secondary winding of the transformer as an example, and the principle is the same when the second winding 3 is the primary winding of the transformer or both the primary winding and the secondary winding are provided with a plurality of taps, which will not be described here.

[0045] Reference Figure 4, the first winding 2 includes a first wire 4, the first wire 4 is wound on the first core column of the core 1, the beginning end and the end of the first wire 4 are led outwards as the connection terminals of the first winding 2; the second winding 3 includes a second wire 5, the second wire 5 is wound on the second core column of the core 1, the beginning end and the end of the second wire 5 are led outwards, and a plurality of taps 6 are formed during the winding of the second wire 5, the beginning end, the end and each tap 6 of the second wire 5 form the connection terminals of the second winding 3. Among them, the tap 6 formed on the second wire 5 is formed during the winding of the second wire 5, which is outwardly extended and reversely wound back. In actual operation, first, the second wire 5 is normally wound from top to bottom on the corresponding core column, when reaching the position where the tap 6 is needed, the second wire 5 is pulled outwards, and then reversely folded back to form a bent loop structure, which is the tap 6 described above, and then the second wire 5 can continue to be wound, and the second wire 5 will not be interrupted at the position of the tap 6. Through this winding method, the second winding 3 with multiple voltage output gears can be continuously wound.

[0046] Among them, the "outwardly extended and reversely wound back" mentioned above refers to the direction of folding back to form a loop-shaped tap 6 relative to the outward extension direction of the second wire 5, for example, taking the direction shown in Figure 2 as an example, the second wire 5 is wound in a counterclockwise direction, when winding to the first tap 6, the second wire 5 is first pulled outwards towards the right side, and then folded back towards the left side, at this time, a tap 6 is formed, and the second wire 5 can continue to wind the next winding section.

[0047] In this way, the second winding 3 is wound by only one second wire 5, and during the winding of the second wire 5, the second wire 5 is outwardly extended and reversely wound back to form a plurality of taps 6, and the winding of the second wire 5 is not interrupted, the taps 6 can cooperate with the beginning end of the second wire 5 to enable the second winding 3 to have multiple voltage output gears, and since the second wire 5 has no interrupted part and is a continuous second wire 5, there is no connection between the coils, the winding is simple, and there is no disconnection between the coils corresponding to each voltage output gear.

[0048] In this embodiment, the second wire 5 in the second winding 3 is divided into a plurality of winding sections by each tap 6, the number of turns of each winding section except the first winding section is 1 turn, and each winding section except the first winding section is wound outside the first winding section and is arranged along the axial direction of the core column of the second winding 3. Among them, the number of turns of the first winding section is greater than the sum of the number of turns of the remaining winding sections.

[0049] Specifically, refer to Figure 3In this embodiment, the number of turns of the first winding 2 is set to 40, and the number of turns of the second winding 3 is set to 42, wherein the number of turns of the first winding section of the second winding 3 is 38, and the number of turns of the remaining winding sections is 1. Thus, the second conductor 5 includes four taps 6 in addition to the beginning and the end of the second conductor 5. In wiring, the cable can be connected to the beginning of the second conductor 5, and then the other end of the cable can be connected to each of the taps 6 and the end of the second conductor 5 according to the required output level. For example, if the output voltage needs to be 218.5V when the input voltage is 230V, the first tap 6 is connected, and if the output voltage needs to be 235.75V, the fourth tap 6 is connected. Meanwhile, the number of turns of the remaining winding sections of the second winding 3 except the first winding section is set to 1, and since the second conductor 5 is continuously wound, the number of turns of 1 will not cause the coil to be easily detached due to too small number of turns.

[0050] With reference to Figure 1 and Figure 2 In Figure 1 is a front view of the transformer, and Figure 2 is a rear view of the transformer. In this embodiment, the remaining winding sections of the second winding 3 except the first winding section, i.e., the winding section with 38 turns, are wound outside the winding section with 38 turns, and are isolated from each other by an insulating material, which can be insulating paper or other materials. By winding the winding section with 1 turn outside the winding section with 38 turns, the distance between the winding sections with 1 turn can be avoided to be too small, which is not conducive to the formation of the taps 6 and external wiring.

[0051] With reference to Figure 1 The transformer further includes a support 7 and a plurality of connecting pieces 8 for external wiring, the core 1 is fixedly arranged on the support 7, and the plurality of connecting pieces 8 are also fixedly arranged on the support 7. The support 7 is connected to the beginning and the end of the first conductor 4, the beginning and the end of the second conductor 5, and the plurality of taps 6. Through the connecting pieces 8, the first winding 2 and the second winding 3 can be conveniently connected to the external wiring, and the connecting pieces 8 can be used to fix the taps 6 and the end of the coil to avoid the coil from being detached during use. The connecting pieces 8 can be made of metal materials with good electrical conductivity and mechanical strength, such as copper or aluminum, and the surface can be treated by tin plating or zinc plating to improve corrosion resistance and contact performance.

[0052] In this embodiment, the number of turns of the first winding 2 is set to 40, and the number of turns of the second winding 3 is set to 42, wherein the number of turns of the first winding section of the second winding 3 is 38, and the number of turns of the remaining winding sections is 1. Thus, the second conductor 5 includes four taps 6 in addition to the beginning and the end of the second conductor 5. In wiring, the cable can be connected to the beginning of the second conductor 5, and then the other end of the cable can be connected to each of the taps 6 and the end of the second conductor 5 according to the required output level. For example, if the output voltage needs to be 218.5V when the input voltage is 230V, the first tap 6 is connected, and if the output voltage needs to be 235.75V, the fourth tap 6 is connected. Meanwhile, the number of turns of the remaining winding sections of the second winding 3 except the first winding section is set to 1, and since the second conductor 5 is continuously wound, the number of turns of 1 will not cause the coil to be easily detached due to too small number of turns. Figure 1In the shown embodiment, the connecting piece 8 is connected with the corresponding tap 6 through a terminal post 9, the terminal post 9 penetrates the corresponding tap 6 along the thickness direction of the second wire 5. Specifically, the terminal post 9 can be a conductive stud, after the terminal post 9 penetrates the tap 6, the terminal post 9 can be fixed on the support 7 through a nut, at the same time, the connecting piece 8 is also fixed on the support 7, so as to complete the connection between the connecting piece 8 and the corresponding tap 6.

[0053] In the above embodiment, the number of turns of all the second winding sections is 1 turn, in other embodiments, the number of turns of several second winding sections can be different from 1 turn, for example, the number of turns of the first second winding section is 1 turn, while the number of turns of other second winding sections is 2 turns, 3 turns or other turns, etc., which is not limited here. The specific number of turns can be set according to the actual voltage level requirement of the transformer. Here, it is not limited.

[0054] Embodiment 2

[0055] With reference to Figure 6 and Figure 7 , embodiment 2 of the present application provides a transformer, which is different from embodiment 1 in that, in the present embodiment, when the tap 6 is connected with the connecting piece 8, the coil at the tap 6 is first divided into two terminal ends, and then the two terminal ends are connected with two corresponding terminal posts 9 respectively. Specifically, the coil at the tap 6 can be cut by a shearing device to form two independent terminal ends for each tap 6, and the two terminal ends can be connected with two terminal posts 9 respectively, and the connection mode can be that the terminal post 9 penetrates the coil at the two terminal ends, or the terminal ends can be fixed between the nut and the corresponding gasket by clamping.

[0056] Embodiment 3

[0057] A winding method of a multi-voltage level transformer, comprising the following steps:

[0058] S1, obtaining the voltage difference between adjacent voltage levels in the multi-voltage level of the transformer, and obtaining the minimum voltage difference ΔU from the plurality of voltage differences min ;

[0059] S2, determining the number of turns of each winding section according to , wherein the first winding 2 and / or the second winding 3 has a first winding section and a plurality of second winding sections, and the number of turns of at least one second winding section is 1 turn, wherein U n is the input voltage and / or output voltage level of the transformer;

[0060] S3, according to the number of turns of each winding section, winding the first wire 4 on the core 1 to form the first winding 2, and winding the second wire 5 on the core to form the second winding 3.

[0061] According to the above, in the method, the voltage difference corresponding to the difference of one turn of the transformer coil is actually the minimum voltage difference ΔU min The number of turns required for other voltage levels can be calculated according to the voltage difference corresponding to each 1 turn.

[0062] In the above step S2, the parameters of the transformer core 1 can be determined according to 4.44*Ae*Bm*f=ΔU min (for convenience, replace 4.44*Ae*Bm*f with X), where Ae is the diameter of the transformer core (cross-sectional area), Bm is the magnetic flux density of the core, and f is the working frequency (for example, for a power frequency transformer, it is 50HZ).

[0063] Take a transformer as an example: input 230V, require output voltage 230V, accuracy ±2.5%, ±5%, the corresponding output voltage levels are as follows

[0064] P / input voltage (V) S / output voltage (V) Accuracy 230 218.5 -5％ 230 224.25 -2.5％ 230 230 0％ 230 235.75 2.5％ 230 241.5 5％

[0065] The voltage difference between each output voltage level is 5.75V (i.e. output 230V x 2.5%)

[0066] The formula , let N=1, U=5.75, calculate the value of X as 5.75, according to the formula The number of turns of the transformer coil can be obtained as follows: where U is the input voltage or output voltage of different voltage levels, and N is the corresponding number of turns.

[0067] Input voltage Primary turns Secondary turns Theoretical output voltage (V) Output voltage and accuracy 230 40 38 218.5 Meets requirements 230 40 39 224.25 Meets requirements 230 40 40 230 Meets requirements 230 40 41 235.75 Meets requirements 230 40 42 241.5 Meets requirements

[0068] In the above embodiment, the first winding section of the second winding 3 is 38 turns, and each second winding section is 1 turn. If any voltage level is reduced in the voltage levels of the above transformer, such as 235.75V, then the number of turns of the corresponding second winding section (i.e. the last second winding section) is 2 turns.

[0069] The second winding 3 is formed by winding the second wire 5 on the core 1. The specific winding method includes that after the number of turns of the second wire 5 wound on the core 1 meets the number of turns of the first winding section or the number of turns of the second winding section, the winding end of the second wire 5 is stretched outward and wound back in reverse to form a tap 6 at the connection position of the two winding sections, and the beginning end, the end and each tap of the second wire 5 are adapted to form multiple voltage levels for external wiring.

[0070] When winding the second winding 3, the first winding section is arranged along the core column where the second winding 3 is located in an axial direction, and a plurality of the second winding sections are wound outside the first winding section and arranged along the core column where the second winding 3 is located in an axial direction.

[0071] Further, when winding the second winding 3, the taps are located on the same side of the second winding 3 and arranged along the core column where the second winding 3 is located in an axial direction.

[0072] Further, the first winding 2 and the second winding 3 are wound on the same core column from inside to outside, or wound on the same core column in an up-down distribution manner, or wound on two core columns respectively.

[0073] The winding method described above can finally form the multi-voltage grade transformer in the above-mentioned embodiment 1 or embodiment 2, which is not described here.

[0074] The description of the above specification and embodiments is used to explain the protection scope of the present application, but does not constitute a limitation on the protection scope of the present application. Through the inspiration of the present application or the above-mentioned embodiments, the modification, equivalent replacement or other improvement of the embodiments of the present application or one part of the technical features can be obtained by the ordinary skilled in the art combining with the common knowledge, the ordinary technical knowledge in the art and / or the prior art through logical analysis, reasoning or limited test, which should be included in the protection scope of the present application.

Claims

1. A method of winding a multi-voltage class transformer, the transformer comprising a core, a first winding and a second winding, characterized in that: The method comprises, obtaining voltage differences between adjacent voltage levels in the transformer multi-voltage levels, and obtaining a minimum voltage difference ΔU among the voltage differences min ; According to determining the number of turns of each winding section, wherein the first winding and / or the second winding has a first winding section and a number of second winding sections, and at least one second winding section has one turn, wherein U n is an input voltage and / or an output voltage level of the transformer; According to the number of turns of each winding section, the first winding is formed by winding the first wire on the core, and the second winding is formed by winding the second wire on the core; The winding of the second wire on the core to form the second winding specifically comprises that, after the number of turns of the second wire wound on the core meets the number of turns of the first winding section or the number of turns of the second winding section except the last second winding section, the winding end of the second wire is extended outward and wound back reversely so that the connection position of the two winding sections forms a tap, and the beginning end, the end and each tap of the second wire are adapted to connect a plurality of voltage levels.

2. A method of winding a multi-voltage class transformer as claimed in claim 1, characterized in that, The according to After determining the number of turns of each winding section, further comprising, according to 4.44*Ae*Bm*f=ΔU min Determining the parameters of the core of the transformer, wherein Ae is the cross-sectional area of the core, Bm is the magnetic flux density of the core, and f is the operating frequency.

3. A method of winding a multi-voltage class transformer according to any one of claims 1-2, characterized in that, The first winding section is arranged axially along the core column where the second winding is located, and a plurality of second winding sections are wound outside the first winding section and arranged axially along the core column where the second winding is located.

4. A method of winding a multi-voltage class transformer as claimed in any one of claims 1-2, characterized in that, Each tap is located on the same side of the second winding and is arranged axially along the core column where the second winding is located.

5. A method of winding a multi-voltage class transformer as claimed in claim 4, characterized in that, The first winding and the second winding are wound on the same core column from inside to outside.

6. A method of winding a multi-voltage class transformer as claimed in claim 5, characterized in that, The first winding and the second winding are wound on the same core column in an up-down distribution manner, or are wound on two core columns respectively.

7. A multi-voltage level transformer wound by the winding method according to any one of claims 1-6.

8. The multi-voltage level transformer of claim 7, wherein, The core is fixedly installed on the support, and the connecting pieces are fixedly installed on the support and connected with the beginning end and the end of the first winding, the beginning end and the end of the second winding, and the plurality of taps.

9. The multi-voltage level transformer of claim 8, wherein, The connecting pieces are connected with the corresponding taps through the connecting posts, and the taps are divided into two connecting ends which are respectively connected with the corresponding two connecting posts.

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