Transformer and three-winding rectifier transformer coil structure thereof
By adding a shielding layer to the transformer and adopting a split parallel three-winding structure, combined with transposed wire winding, the problems of eddy current loss and leakage flux under high-frequency harmonics were solved, achieving efficient operation and reduced temperature rise of the transformer.
Patent Information
- Application Number
- CN202423174291.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-20
- Publication Date
- 2025-12-19
- Estimated Expiration
- 2034-12-20
AI Technical Summary
The problems of eddy current loss and leakage flux in existing transformers under high-frequency harmonics have not been effectively solved, affecting the operating efficiency and reliability of the equipment.
A shielding layer is added to the transformer structure, and the tertiary winding is designed as a split parallel structure. At the same time, transposed wires are used for winding to reduce lateral leakage flux and eddy current losses.
It effectively reduces eddy current losses and leakage flux under high-frequency harmonics, reduces the heat generation of transformers, and improves the operational reliability of equipment and the success rate of load testing.
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Figure CN223692976U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to the technical field of transformer production and manufacture, specifically relates to a transformer and three-winding rectifier transformer coil structure thereof. BACKGROUND
[0002] As the basic equipment of power transmission and distribution, with the continuous development of the industry and the continuous improvement of demand, higher requirements are put forward for its application conditions and operating environment. For some special loads, not only are there a large number of high-order harmonics in the load current, but also the phases of different order harmonics in the two secondary windings are opposite. Therefore, when considering the additional loss influencing factors, not only the influence of high-order harmonic loss should be considered, but also the influence of different phase current magnetic leakage should be considered. SUMMARY
[0003] In order to overcome the above technical defects, the utility model provides a kind of transformer and three-winding rectifier transformer coil structure thereof, it aims at how to solve the technical problems of eddy current loss and magnetic flux leakage of transformer under high frequency harmonic in prior art.
[0004] The utility model is realized according to the following technical solutions:
[0005] The utility model provides a kind of three-winding rectifier transformer coil structure, it includes:
[0006] Primary winding, tertiary winding and secondary winding are sequentially arranged along the radial direction;Wherein,
[0007] Shielding layer is arranged between the primary winding and the tertiary winding;
[0008] The tertiary winding is of split parallel structure;
[0009] The secondary winding includes secondary winding upper coil and secondary winding lower coil, the secondary winding upper coil and the secondary winding lower coil are distributed in an upper and lower arrangement, the secondary winding upper coil is used for first load connection, and the secondary winding lower coil is used for second load connection.
[0010] Compared with prior art, the shielding layer is added between the primary winding and the tertiary winding, the transverse magnetic flux is intercepted, the influence between each coil is reduced while reducing magnetic flux, and the eddy current loss under high frequency harmonic is effectively reduced.
[0011] In one embodiment, the tertiary winding includes tertiary winding upper coil and tertiary winding lower coil, the tertiary winding upper coil and the tertiary winding lower coil are distributed in an upper and lower arrangement, and the center of the tertiary winding upper coil coincides with the center of the tertiary winding lower coil.
[0012] In an embodiment, the upper coil of the tertiary winding is arranged to have a positive projection that coincides with a positive projection of the lower coil of the tertiary winding.
[0013] In an embodiment, a spacer is arranged between the upper coil of the tertiary winding and the lower coil of the tertiary winding.
[0014] In an embodiment, the tertiary winding and the secondary winding are both wound by transposed conductors.
[0015] In an embodiment, the shielding layer comprises a monolithic structure or a segmented structure.
[0016] The utility model also provides a transformer, it includes:
[0017] An iron core;
[0018] And the three winding rectifier transformer coil structure as described above;
[0019] The iron core, the primary winding, the tertiary winding and the secondary winding are sequentially arranged along a radial direction. BRIEF DESCRIPTION OF DRAWINGS
[0020] The specific embodiment of the utility model will be explained in further detail below in combination with the drawings, wherein:
[0021] Figure 1 It is the schematic diagram of three winding rectifier transformer coil structure of the utility model;
[0022] Figure 2 It is the plan view of three winding rectifier transformer coil structure of the utility model;
[0023] Figure 3 It is the schematic diagram of tertiary winding split parallel type structure of the utility model;
[0024] Figure 4a It is the data diagram of coil magnetic flux under 50Hz with shielding layer;
[0025] Figure 4b It is the data diagram of coil magnetic induction intensity under 50Hz with shielding layer;
[0026] Figure 5a It is the data diagram of coil magnetic flux under 50Hz without shielding layer;
[0027] Figure 5b It is the data diagram of coil magnetic induction intensity under 50Hz without shielding layer;
[0028] Figure 6a It is the data diagram of coil magnetic flux under 650Hz with shielding layer;
[0029] Figure 6ba data graph of the magnetic flux of the coil without a shielding layer at 650 Hz;
[0030] Figure 7a a data graph of the magnetic flux of the coil without a shielding layer at 650 Hz;
[0031] Figure 7b a data graph of the magnetic flux of the coil without a shielding layer at 650 Hz;
[0032] Figure 8a a data graph of the magnetic flux of the coil with a split parallel structure of the third winding;
[0033] Figure 8b a data graph of the magnetic flux of the coil with a split parallel structure of the third winding;
[0034] Figure 9a a data graph of the magnetic flux of the coil with a continuous structure of the third winding;
[0035] Figure 9b a data graph of the magnetic flux of the coil with a continuous structure of the third winding.
[0036] BRIEF DESCRIPTION OF DRAWINGS
[0037] 10 primary winding, 20 tertiary winding, 210 upper coil of the tertiary winding, 230 lower coil of the tertiary winding, 30 secondary winding,
[0038] 310 upper coil of the secondary winding, 320 lower coil of the secondary winding, 40 shielding layer, 50 iron core DETAILED DESCRIPTION
[0039] The preferred embodiments of the present application will be described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are merely intended to illustrate and explain the present application, and are not intended to limit the present application.
[0040] In order to better illustrate the present application, the present application will be described in further detail below with reference to the accompanying drawings.
[0041] It should be clear that the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.
[0042] The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the description of the application and the appended claims, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It also will be understood that the term "and / or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
[0043] The following description refers to the accompanying drawings. In the following description, same numbers used in different drawings represent the same or similar elements unless otherwise described. The following example embodiments described in the following examples do not represent all implementations consistent with the present application. Instead, they are merely examples of apparatuses and methods consistent with some aspects of the present application as detailed in the appended claims. In the description of the application, it should be understood that the terms "first", "second", "third", etc., merely identify different instances of the similar objects and do not necessarily imply a specific order or sequence, nor they should be understood as indicating or implying relative importance. The specific meaning of the above terms in the present application can be understood by the person of ordinary skill in the art according to the specific circumstances.
[0044] In addition, in the description of the application, "a plurality of" means two or more, unless otherwise stated. "And / or" describes the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B can represent the three cases of A alone, A and B together, and B alone. The character " / " generally represents that the associated objects before and after are in an "or" relationship.
[0045] In combination Figures 1 to 3 As shown in the drawings, the utility model provides a three winding rectifier transformer coil structure, it includes: primary winding 10, tertiary winding 20 and secondary winding 30 are sequentially arranged along the radial direction, wherein, the primary winding 10 with the tertiary winding 20 between being equipped with shielding layer 40, the tertiary winding 20 is split parallel structure, the secondary winding 30 includes secondary winding upper coil 310 and secondary winding lower coil 320, the secondary winding upper coil 310 with the secondary winding lower coil 320 is up, down distribution type setting, the secondary winding upper coil 310 is used for first load connection, the secondary winding lower coil 320 is used for second load connection.
[0046] Compared with the prior art, the application increases the shielding layer 40 between the primary winding 10 and the tertiary winding 20, intercepts the transverse leakage magnetic field, reduces the leakage magnetic field, and also reduces the influence between the coils, effectively reduces the eddy current loss under high frequency harmonic.
[0047] Specifically, the present application carries out simulation experiments on different frequencies without and with the shielding layer 40, and the simulation inputs of the simulation model are set as follows:
[0048] 1) Two current sources (one for each secondary winding 30) are inputted, and the two current sources are opposite in phase at certain frequencies;
[0049] 2) The primary side winding is short-circuited;
[0050] 3) An equivalent capacitive load is added to the third winding.
[0051] The above simulation model and simulation input settings are applied to carry out simulation experiments on the coils at 50 Hz and 650 Hz, respectively, to obtain the eddy current loss of each winding and the shielding layer 40, and the results are shown in Table 1. Figures 4a to 7b
[0052] According to the above simulation analysis process, the eddy current loss at two frequencies can be sorted out, and the results are shown in Table 1.
[0053]
[0054] Table 1 shows the eddy current loss of each winding and the shielding layer at 50 Hz and 650 Hz with / without the shielding layer.
[0055] According to the data in Table 1, it can be seen that:
[0056] 1) When the test frequency is 50 Hz, the increase of the shielding layer has little effect on the eddy current loss of each winding;
[0057] 2) When the test frequency is 650 Hz, the eddy current loss of each winding decreases significantly after the increase of the shielding layer.
[0058] From the simulation results and data, it can be seen that the increase of the shielding layer can effectively reduce the eddy current loss at high frequency harmonics, mainly because the shielding layer can intercept the transverse leakage magnetic field, thereby reducing the leakage magnetic field and the influence between windings.
[0059] In the embodiment, the tertiary winding 20 is of a split parallel structure, and includes a tertiary winding upper coil 210 and a tertiary winding lower coil 230, which are arranged in an upper and lower distribution manner. The centers of the tertiary winding upper coil 210 and the tertiary winding lower coil 230 coincide. The tertiary winding 20 is improved from a continuous structure to a split parallel structure, which can reduce the leakage magnetic influence between windings and improve the anti-interference ability.
[0060] Further, the upper third winding coil 210 is projected on the lower third winding coil 230. A spacer is arranged between the upper third winding coil and the lower third winding coil to support the upper third winding coil. The inner side of the upper third winding coil is provided with a wire, and the outer side of the lower third winding coil is provided with a wire.
[0061] Specifically, the present application simulates the eddy current loss under different third winding structures, wherein Figure 8a and Figure 9b are the magnetic flux and magnetic field intensity distribution under two different winding structures after injecting the 13th harmonic (650 Hz).
[0062] According to the data in the figure, the eddy current loss results in Table 2 can be obtained.
[0063]
[0064] Table 2 is the eddy current loss results of each coil under different third winding structures.
[0065] According to the data in Table 2, it can be known that:
[0066] 1) After the structure of the third winding is changed to the split parallel type, the eddy current loss values of the coils except the third winding are reduced, and the eddy current loss value of the primary side is reduced most obviously.
[0067] 2) The eddy current loss value of the third winding is increased. The reason is that after the structure is changed from the original continuous type to the split parallel type, the magnetic flux leakage between the two parallel sections will be larger and more concentrated.
[0068] 3) Although the eddy current loss value of the third winding is increased, the winding capacity is small, and the eddy current loss ratio is not large, so the influence on the temperature rise is small.
[0069] 4) The large reduction of the eddy current loss of the primary and secondary windings is beneficial to reduce the overall temperature rise of the transformer.
[0070] In the embodiment, the third winding 20 and the secondary winding 30 are both wound by transposed wires. The transposed wires used in the embodiment have higher mechanical strength and heat dissipation performance while increasing the insulation strength. Compared with manual wire transposition, the third winding 20 and the secondary winding 30 both use transposed wires, which can greatly reduce the process complexity and greatly shorten the winding time.
[0071] Since the transposed conductor is made of multiple thin conductors, compared with large-size conductors, the skin effect of current is obviously reduced, and the transposition between the conductors is considered, the length of each conductor is consistent, and the eddy current loss between the conductors is reduced. In addition, compared with the transposition by manual winding, the transposed conductor has many conveniences, can greatly reduce the load loss and winding hot spot temperature rise, improves the mechanical strength of the winding, and makes the coil structure more compact.
[0072] In summary, the increase of the shielding layer 40, the split parallel structure of the tertiary winding 20 and the application of the transposed conductor can reduce the eddy current loss and additional loss to a certain extent, so that the improvement measures provided by the patent have certain practical significance and reference value.
[0073] In one embodiment, the shielding layer 40 includes a monolithic structure or a segmented structure.
[0074] The utility model also provides a kind of transformer, it includes: iron core 50;And the three-winding rectifier transformer coil structure as described above;The iron core 50, the primary winding 10, the tertiary winding 20 and the secondary winding 30 are sequentially arranged along the radial direction.The transformer of the application reduces the eddy current loss and additional loss caused by high-order harmonic, leakage magnetic flux etc., reduces the heat output of transformer, reduces the temperature rise of transformer, improves the success rate of prototype in user end according to actual load to be associated with the test.
[0075] According to the disclosure and teaching of the above description, the skilled in the art of the utility model can also change and modify the above embodiments. Therefore, the utility model is not limited to the specific embodiments disclosed and described above, and some modifications and changes of the utility model should fall within the protection scope of the claims of the utility model. In addition, although some specific terms are used in the specification, these terms are only for convenience of description, and do not constitute any limitation on the utility model.
Claims
1. A three-winding rectifier transformer coil structure, characterized by The three-winding rectifier transformer coil structure comprises: a primary winding, a tertiary winding and a secondary winding arranged in sequence along a radial direction; wherein a shielding layer is arranged between the primary winding and the tertiary winding; the tertiary winding is of a split-parallel structure; the secondary winding comprises a secondary winding upper coil and a secondary winding lower coil, the secondary winding upper coil and the secondary winding lower coil are arranged in an upper and lower distribution manner, the secondary winding upper coil is used for connecting a first load, and the secondary winding lower coil is used for connecting a second load.
2. The three-winding rectifier transformer coil structure according to claim 1, characterized in that: the tertiary winding comprises a tertiary winding upper coil and a tertiary winding lower coil, the tertiary winding upper coil and the tertiary winding lower coil are arranged in an upper and lower distribution manner, and the center of the tertiary winding upper coil coincides with the center of the tertiary winding lower coil.
3. The three-winding rectifier transformer coil structure according to claim 2, characterized in that: the orthographic projection of the tertiary winding upper coil coincides with the orthographic projection of the tertiary winding lower coil.
4. The three-winding rectifier transformer coil structure according to claim 2 or 3, characterized in that: a spacer is arranged between the tertiary winding upper coil and the tertiary winding lower coil.
5. The three-winding rectifier transformer coil structure according to claim 1, characterized in that: the tertiary winding and the secondary winding are both wound by transposed wire.
6. The three-winding rectifier transformer coil structure according to claim 1, characterized in that: the shielding layer comprises a whole structure or a segmented structure.
7. A transformer, characterized by The three-winding rectifier transformer coil structure comprises: an iron core; and the three-winding rectifier transformer coil structure according to any one of claims 1-6; the iron core, the primary winding, the tertiary winding and the secondary winding are arranged in sequence along a radial direction.