Transformer
Through the pressure-regulating winding design with coarse adjustment on the inside and fine adjustment on the outside and the axial arrangement of the balanced winding, the problem of additional series reactors required for transformers with balanced windings is solved, and the cost reduction and size reduction effect is achieved.
Patent Information
- Application Number
- CN202421917920.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-08
- Publication Date
- 2025-09-02
- Estimated Expiration
- 2034-08-08
AI Technical Summary
Existing transformers with balanced windings require additional series reactors, resulting in high costs and large body size.
The pressure-regulating winding design is adopted with the inner coarse adjustment and the outer fine adjustment, and the balanced winding is externally arranged in axial direction with the fine adjustment coil, removing the series reactor to improve the impedance of the balanced winding.
Reduces the manufacturing cost of the transformer and reduces the body size while increasing the impedance of the balanced winding.
Smart Images
Figure CN223296645U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of transformers, in particular to a transformer with a balanced winding. Background Art
[0002] For power transformers of a certain capacity, when both the high-voltage and low-voltage windings are star-connected, a separate delta-connected balancing winding is necessary to provide a path for the third-harmonic current to flow, suppress the third-harmonic flux in the transformer core, and ensure the sinusoidal nature of the three-phase voltage. This balancing winding, designed solely to smooth the third-harmonic flux, is traditionally placed at the innermost end of the windings. That is, the windings are arranged in the following order, from the innermost to the outermost: balancing winding, low-voltage winding, high-voltage winding, and regulating winding. The disadvantage of this winding arrangement is that, since the balancing winding is placed at the innermost end of the windings, the distance from the core to the other windings (except the balancing winding) is significantly increased. Consequently, the average radius of both the low-voltage and high-voltage windings increases, along with their average length and DC resistance. The load losses of a transformer are positively correlated with the DC resistance of the high-voltage and low-voltage windings. Therefore, under the same conditions, the transformer load losses increase when the balancing winding is placed inside the transformer compared to a conventional two-winding transformer.
[0003] In addition, for transformers with balanced windings, the balanced windings do not carry three-phase loads, and the current density design value is usually relatively high. At the same time, the balance-related impedance needs to be increased to meet the short-circuit requirements. As mentioned above, for transformers with balanced windings, the coils are conventionally arranged from the inside out in the order of balanced, low-voltage, high-voltage, and voltage-regulating coils. Because the current density of the balanced winding is relatively high, in order to improve the short-circuit capability of the balanced winding, it is necessary to increase the impedance of the balanced winding by connecting a reactor in series at the end of the balanced winding. However, this solution results in a higher transformer cost and a larger body size.
[0004] Therefore, there is a need for an improved transformer, which eliminates the need for an additional series reactor for a transformer with a balanced winding, thereby reducing the manufacturing cost of the transformer and reducing the size of the transformer body. Utility Model Content
[0005] The utility model provides a transformer, which at least solves the problem in the prior art that a transformer with a balanced winding must be additionally provided with a series reactor.
[0006] According to one aspect of the utility model, a transformer is provided, characterized in that the transformer comprises: an iron core; a low-voltage winding, a high-voltage winding, and a voltage-regulating winding wound on the iron core in sequence from the inside to the outside, wherein the voltage-regulating winding comprises a coarse-adjusting winding and a fine-adjusting winding, and the distance between the coarse-adjusting winding and the iron core is smaller than the distance between the fine-adjusting winding and the iron core; the transformer further comprises: a balancing winding, the balancing winding is wound on the iron core, and the balancing winding and the fine-adjusting winding are arranged in sequence along the axial direction of the iron core, so that the distance between the balancing winding and the iron core is equal to the distance between the fine-adjusting winding and the iron core.
[0007] In this way, the transformer of the present invention makes the voltage adjustment into a coarse and fine adjustment design, with the inside as coarse adjustment and the outside as fine adjustment, and the balance winding is placed outside and arranged axially with the fine adjustment coil, thereby increasing the impedance of the balance winding, removing the series inductor, reducing the manufacturing cost of the transformer, and reducing the size of the transformer body.
[0008] Preferably, the fine tuning winding includes a first fine tuning winding and a second fine tuning winding, and the first fine tuning winding, the balance winding, and the second fine tuning winding are arranged in sequence along the axial direction of the iron core.
[0009] In this manner, the transformer of the present invention can reduce its size by sequentially arranging a first fine tuning winding, a balance winding, and a second fine tuning winding along the axial direction of the iron core. Preferably, the fine tuning winding includes a first fine tuning winding and a second fine tuning winding, and the balance winding includes a first balance winding and a second balance winding, and the first fine tuning winding, the first balance winding, the second balance winding, and the second fine tuning winding are sequentially arranged along the axial direction of the iron core.
[0010] In this way, the transformer of the present invention can improve the impedance of the balance winding and remove the series inductor by sequentially arranging the first fine-tuning winding, the first balance winding, the second balance winding, and the second fine-tuning winding along the axial direction of the iron core.
[0011] Preferably, the fine-tuning winding includes a first fine-tuning winding and a second fine-tuning winding, the balanced winding includes a first balanced winding and a second balanced winding, and the first balanced winding, the first fine-tuning winding, the second fine-tuning winding, and the second balanced winding are arranged in sequence along the axial direction of the iron core.
[0012] In this way, the transformer of the present invention can reduce the manufacturing cost of the transformer by sequentially arranging the first balance winding, the first fine tuning winding, the second fine tuning winding, and the second balance winding along the axial direction of the iron core.
[0013] Preferably, the first balance winding is connected in parallel with the second balance winding.
[0014] In this way, the transformer of the present invention can increase the impedance of the balanced winding by connecting the first balanced winding and the second balanced winding in parallel.
[0015] Preferably, the first fine-tuning winding is connected in parallel with the second fine-tuning winding.
[0016] In this way, the transformer of the present invention can reduce the size of the device by connecting the first balance winding and the second balance winding in parallel.
[0017] Preferably, the first balance winding and the second balance winding have the same number of turns.
[0018] In this way, the transformer of the present invention can reduce the manufacturing cost of the transformer by making the number of turns of the first balance winding and the second balance winding the same.
[0019] Preferably, an insulation distance is maintained between the balancing winding and the fine-tuning winding.
[0020] In this way, the transformer of the present invention can improve the performance of the transformer by maintaining the insulation distance between the balance winding and the fine-tuning winding.
[0021] The technical solution of this utility model achieves the following technical effects:
[0022] 1) Reduce the size of the device;
[0023] 2) Increase the impedance of the balance winding and remove the series reactor;
[0024] 3) Reduce costs. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, so that those skilled in the art will have a clearer understanding of the above and other features and advantages of the present invention. In the accompanying drawings:
[0026] Figure 1 is a schematic block diagram showing a transformer according to a first embodiment of the present invention.
[0027] Figure 2 is a schematic block diagram showing a transformer according to a second embodiment of the present invention.
[0028] Figure 3 is a schematic block diagram showing a transformer according to a third embodiment of the present invention.
[0029] List of reference numerals:
[0030] 10, 20, 30: transformer;
[0031] 102, 202, 302: iron core;
[0032] 104, 204, 304: low voltage winding;
[0033] 106, 206, 306: high voltage winding;
[0034] 108, 208, 308: coarse winding;
[0035] 110, 114, 210, 216, 312, 314: fine-tuning windings;
[0036] 112, 212, 214, 310, 316: Balance windings. DETAILED DESCRIPTION
[0037] In order to make the purpose, technical solutions and advantages of the present invention more clear, the following embodiments further illustrate the present invention in detail.
[0038] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.
[0039] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by ordinary technicians in the technical field to which this application belongs.
[0040] In the present invention, unless otherwise specified, directional words such as "up, down, top, bottom" are usually used with reference to the directions shown in the drawings, or with reference to the components themselves in the vertical, perpendicular or gravity direction; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above directional words are not used to limit the present invention.
[0041] In order to further understand the technical solution of the present invention, the basic concepts involved in the present invention are briefly described:
[0042] Balanced windings are commonly used in high-voltage transformers in power systems, particularly where harmonic current reduction and system stability improvement are required. In some specialized applications, such as industrial automation and power electronics, balanced windings are also used to reduce harmonic currents and improve system reliability.
[0043] The placement of the balance winding on the core has a significant impact on transformer performance. Here are some specific effects and their causes:
[0044] 1) Reduce harmonic currents: Balanced windings provide a channel for higher harmonics, improving the induced electromotive force waveform. Different connection methods for three-phase transformer windings affect no-load losses and no-load current. Balanced windings ensure that the transformer's output voltage is close to a sine wave, reducing the impact of harmonic currents and thus improving power supply quality.
[0045] 2) Improve transformer efficiency: Balanced windings help improve transformer efficiency by reducing harmonic losses. Harmonic currents generate additional losses in the transformer, and balanced windings reduce these losses by providing a path for harmonic currents.
[0046] 3) Reduce electromagnetic interference: Balanced windings can suppress electromagnetic interference and improve circuit performance. The winding arrangement of the transformer affects the distribution of its electromagnetic field. A reasonable arrangement can reduce electromagnetic interference and make the circuit more stable and reliable.
[0047] 4) Improved thermal performance: The layout of balanced windings requires consideration of heat dissipation. The heat dissipation performance of the windings directly affects the thermal stability and life of the transformer. Proper layout ensures that the windings can effectively dissipate heat during operation and avoid overheating.
[0048] 5) Reduce vibration and noise: The layout of transformer windings affects their vibration characteristics. The axial and radial vibrations of the windings have a significant impact on the overall performance of the transformer. Proper layout can reduce vibration and noise, improving the operational stability of the transformer.
[0049] 6) Improve insulation performance: The layout of the balanced winding requires consideration of insulation issues. The choice of insulation material and the layout between the winding and the core will affect the insulation performance of the transformer. Proper layout can improve insulation strength and reduce the risk of short circuits and arcing.
[0050] In order to realize a transformer with a balanced winding, the utility model makes the voltage regulation into a coarse and fine adjustment design, with the coarse adjustment on the inside and the fine adjustment on the outside, and places the balanced winding outside and arranged axially with the fine adjustment coil, thereby increasing the impedance of the balanced winding, removing the series inductor, reducing the manufacturing cost of the transformer, and reducing the size of the transformer body.
[0051] The following is a detailed description of the technical solution of the present invention with reference to the accompanying drawings:
[0052] Figure 1 is a schematic block diagram showing a transformer according to a first embodiment of the present invention. Figure 2 is a schematic block diagram showing a transformer according to a second embodiment of the present invention. Figure 3 is a schematic block diagram showing a transformer according to a third embodiment of the present invention.
[0053] like Figure 1 As shown, the transformer 10 includes: an iron core 102; a low voltage winding 104, a high voltage winding 106, and a voltage regulating winding wound on the iron core 102 from the inside to the outside, wherein the voltage regulating winding includes a coarse tuning winding 108 and fine tuning windings 110, 114, and the distance between the coarse tuning winding 108 and the iron core 102 is smaller than the distance between the fine tuning windings 110, 114 and the iron core 102. The transformer 10 also includes: a balancing winding 112, which is wound on the iron core 102, and the balancing winding 112 and the fine tuning windings 110, 114 are arranged in sequence along the axial direction of the iron core 102 as shown by arrow A, so that the distance between the balancing winding 112 and the iron core 102 is equal to the distance between the fine tuning windings 110, 114 and the iron core 102. Figure 1 As shown in FIG, a fine tuning winding 110, a balance winding 112, and a fine tuning winding 114 are sequentially arranged along the axial direction of the core 102 as indicated by arrow A, so that along the axial direction of the core 102, the balance winding 112 is placed between the fine tuning winding 110 and the fine tuning winding 114. Although not shown, those skilled in the art will appreciate that, in addition to using Figure 1 In addition to the structure shown in FIG, transformer 10 may also include a medium voltage winding. Thus, a low voltage winding 104, a medium voltage winding (not shown), a high voltage winding 106, and a voltage regulating winding are wound sequentially from the inside outward on core 102. Furthermore, fine tuning windings 110 and 114 may be connected in parallel. Furthermore, insulation distances are maintained between balancing winding 112 and fine tuning winding 110, and between balancing winding 112 and fine tuning winding 114.
[0054] like Figure 2 As shown, the transformer 20 includes: an iron core 202; a low voltage winding 204, a high voltage winding 206, and a voltage regulating winding wound on the iron core 202 from the inside to the outside, wherein the voltage regulating winding includes a coarse tuning winding 208 and fine tuning windings 210, 216, and the distance between the coarse tuning winding 208 and the iron core 202 is smaller than the distance between the fine tuning windings 210, 216 and the iron core 202. The transformer 20 also includes: balancing windings 212, 214, which are wound on the iron core 202, and the balancing windings 212, 214 and the fine tuning windings 210, 216 are arranged in sequence along the axial direction of the iron core 202, so that the distance between the balancing windings 212, 214 and the iron core 202 is equal to the distance between the fine tuning windings 210, 216 and the iron core 202. Figure 2 As shown in FIG, a fine tuning winding 210, a balance winding 212, a balance winding 214, and a fine tuning winding 216 are sequentially arranged along the axial direction of the core 202, so that along the axial direction of the core 202, the balance winding 212 and the balance winding 214 are placed between the fine tuning winding 210 and the fine tuning winding 216. Although not shown, those skilled in the art will appreciate that, in addition to using Figure 2In addition to the structure shown in , the transformer 20 may further include a medium voltage winding, and therefore, a low voltage winding 204, a medium voltage winding (not shown), a high voltage winding 206, and a voltage regulating winding are wound on the iron core 202 in sequence from the inside to the outside. In addition, the fine tuning windings 210 and 216 may be connected in parallel. In addition, an insulation distance is maintained between the balance winding 212 and the fine tuning winding 210, and between the balance winding 214 and the fine tuning winding 216. The balance winding 212 and the balance winding 214 are connected in parallel, and the number of turns of the balance winding 212 and the balance winding 214 are the same as each other, and the winding directions of the balance winding 212 and the balance winding 214 on the iron core 202 are opposite to each other.
[0055] like Figure 3 As shown, the transformer 30 includes: an iron core 302; a low voltage winding 304, a high voltage winding 306, and a voltage regulating winding wound on the iron core 302 from the inside to the outside, wherein the voltage regulating winding includes a coarse tuning winding 308 and fine tuning windings 312, 314, and the distance between the coarse tuning winding 308 and the iron core 302 is smaller than the distance between the fine tuning windings 312, 314 and the iron core 302. The transformer 30 also includes: balancing windings 310, 316, which are wound on the iron core 302, and the balancing windings 310, 316 and the fine tuning windings 312, 314 are arranged in sequence along the axial direction of the iron core 302, so that the distance between the balancing windings 310, 316 and the iron core 302 is equal to the distance between the fine tuning windings 312, 314 and the iron core 302. Figure 3 As shown in FIG, a balancing winding 310, a fine tuning winding 312, a fine tuning winding 314, and a balancing winding 316 are sequentially arranged along the axial direction of the core 302, so that the fine tuning winding 312 and the fine tuning winding 314 are placed between the balancing winding 310 and the balancing winding 316 along the axial direction of the core 302. Although not shown, those skilled in the art will appreciate that, in addition to using Figure 3 In addition to the structure shown in , the transformer 30 may further include a medium voltage winding, and therefore, a low voltage winding 304, a medium voltage winding (not shown), a high voltage winding 306, and a voltage regulating winding are wound on the iron core 302 in sequence from the inside to the outside. In addition, the fine tuning windings 312 and 314 may be connected in parallel. In addition, an insulation distance is maintained between the balance winding 310 and the fine tuning winding 312, and between the balance winding 316 and the fine tuning winding 314. The balance winding 310 and the balance winding 316 are connected in parallel, and the number of turns of the balance winding 310 and the balance winding 316 are the same as each other, and the winding directions of the balance winding 310 and the balance winding 316 on the iron core 302 are opposite to each other.
[0056] The technical solution of this utility model achieves the following technical effects:
[0057] 1) Reduce the size of the device;
[0058] 2) Increase the impedance of the balance winding and remove the series reactor;
[0059] 3) Reduce costs.
Claims
1. A transformer (10), characterized in that: The transformer comprises: core (102); A low-voltage winding (104), a high-voltage winding (106), and a voltage-regulating winding are sequentially wound on the iron core from the inside to the outside, wherein the voltage-regulating winding includes a coarse-regulating winding (108) and a fine-regulating winding (110, 114), and the distance between the coarse-regulating winding and the iron core is smaller than the distance between the fine-regulating winding and the iron core; and A balance winding (112) is wound on the iron core, and the balance winding and the fine-tuning winding are arranged in sequence along the axial direction of the iron core, so that the distance between the balance winding and the iron core is equal to the distance between the fine-tuning winding and the iron core.
2. The transformer according to claim 1, characterized in that The fine tuning winding includes a first fine tuning winding and a second fine tuning winding, and the first fine tuning winding, the balance winding, and the second fine tuning winding are sequentially arranged along the axial direction of the iron core.
3. The transformer according to claim 1, characterized in that The fine-tuning winding includes a first fine-tuning winding and a second fine-tuning winding, and the balanced winding includes a first balanced winding and a second balanced winding, and the first fine-tuning winding, the first balanced winding, the second balanced winding, and the second fine-tuning winding are arranged in sequence along the axial direction of the iron core.
4. The transformer according to claim 1, characterized in that The fine-tuning winding includes a first fine-tuning winding and a second fine-tuning winding, and the balanced winding includes a first balanced winding and a second balanced winding, and the first balanced winding, the first fine-tuning winding, the second fine-tuning winding, and the second balanced winding are arranged in sequence along the axial direction of the iron core.
5. The transformer according to claim 3 or 4, characterized in that: The first balance winding is connected in parallel with the second balance winding.
6. The transformer according to claim 3 or 4, characterized in that: The first fine tuning winding and the second fine tuning winding are connected in parallel.
7. The transformer according to claim 3 or 4, characterized in that: The first balance winding and the second balance winding have the same number of turns.
8. The transformer according to claim 1, characterized in that An insulation distance is maintained between the balance winding and the fine-tuning winding.