Double-voltage transformer
By using high-voltage coils with equal turns in a dual-voltage transformer and switching between series or parallel connections, the circulating current problem caused by unequal coil lengths is solved, achieving a highly efficient and energy-saving transformer design and reducing costs and manufacturing difficulties.
Patent Information
- Application Number
- CN202520049493.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-09
- Publication Date
- 2025-12-30
- Estimated Expiration
- 2035-01-09
AI Technical Summary
Existing dual-voltage transformers suffer from increased circulating current and losses due to unequal coil lengths during voltage switching. Furthermore, the segmented improvement method increases the difficulty of insulation materials and manufacturing, wastes space, and raises costs.
The high-voltage side winding consists of two sets of coils with equal number of turns, which can be switched by series or parallel connection, omitting inter-segment insulation, and keeping the coil length and DC resistance equal to achieve a single-segment structure.
It reduces circulating current losses, improves space utilization, reduces transformer size and manufacturing costs, and simplifies the manufacturing process.
Smart Images
Figure CN223743423U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to transformer technical field, especially relates to a dual-voltage transformer. BACKGROUND
[0002] According to the need of user, the terminal user of distribution needs to reduce high voltage through transformer to be applicable to the voltage (generally high pressure is 10 or 20KV, low pressure is 400V) of terminal equipment, and due to the difference of network voltage, different high voltage grade transformer is needed to adapt to network voltage, in order to save energy and reduce consumption, a transformer is made into both 20KV network and 10KV network, so high voltage is converted through no excitation switch, this method is quick and convenient, and two voltages can be switched arbitrarily according to network voltage, and this transformer is called dual-voltage transformer.
[0003] To realize this conversion function, high voltage coil is made into two coils with equal voltage, as shown in Figure 1 When 10KV is connected, two coils are connected in parallel, and when 20KV is connected, two coils are connected in series. Although this can realize the switching of voltage, there is a problem, that is, the average radius of the inner and outer coils is different, so the wire length of the two coils is not equal, and the direct current resistance is not equal. When two coils are connected in parallel, a circulating current will be generated in the coil, and the circulating current will lead to the increase of additional current and loss, and even the transformer will be burned out.
[0004] The existing improvement method is to change the coil into segmented type, as shown in Figure 2 The connection principle diagram is shown in Figure 3 The high voltage coil is divided into two coils with equal voltage, and when high voltage is connected, two coils are connected in series, and when low voltage is connected, two coils are connected in parallel. Since the winding method, number of turns and cross section of the wire of the two coils are the same, the average radius is the same, so the wire length of the two coils is equal, and the direct current resistance is also the same, so when two coils are connected in parallel, no circulating current is generated between the coils. The disadvantage is that the segment insulation and end insulation between the two segments of the coil are needed, and the existence of segment insulation and end insulation wastes the effective occupation space of the wire, reduces the space utilization, increases the volume of the coil, and increases the volume of the transformer. In addition to the material and processing of segment insulation, these all greatly increase the manufacturing cost of the transformer. Since the coil is two segments, the manufacturing difficulty of the coil is also increased, and the labor hours are wasted. UTILITY MODEL CONTENTS
[0005] In view of the above situation, in order to overcome the defects of the prior art, the utility model provides a dual-voltage transformer, which at least partially solves the above technical problems.
[0006] The utility model discloses a technical scheme as follows: a double-voltage transformer, including high -voltage side winding, low -voltage side winding and closed iron core, high -voltage side winding and low -voltage side winding are arranged in closed iron core respectively, high -voltage side winding includes high -voltage side winding one and high -voltage side winding two, two coils of equal number of turns are equipped with in high -voltage side winding one, and be high -voltage coil a and high -voltage coil b, high -voltage coil a is located in the inner side of high -voltage side winding two, and high -voltage coil b is located in the outer side of high -voltage side winding two, high -voltage coil two are equipped with in high -voltage side winding two, and the number of turns and the radial dimension of high -voltage coil a and high -voltage coil b are equal to the number of turns and the radial dimension of high -voltage coil in high -voltage side winding two, high -voltage side winding one and high -voltage side winding two are connected in series and parallel two connection modes according to the demand with the alternative mode connection.
[0007] Further, the two ends of the high-voltage coil a, the high-voltage coil b and the high-voltage coil two are respectively provided with a head end and a tail end.
[0008] Further, the tail end of the high-voltage coil a is connected with the head end of the high-voltage coil b.
[0009] Further, in the double-voltage transformer, when the high-voltage side winding one and the high-voltage side winding two are connected in parallel, the tail end of the high-voltage coil b is connected with the head end of the high-voltage coil two.
[0010] Further, in the double-voltage transformer, when the high-voltage side winding one and the high-voltage side winding two are connected in series, the head end of the high-voltage coil a is connected with the head end of the high-voltage coil two, and the tail end of the high-voltage coil b is connected with the tail end of the high-voltage coil two.
[0011] After the above structure is adopted, the utility model has the beneficial effects as follows: the number of turns and the radial dimension of the high-voltage coil a and the high-voltage coil b are equal to the number of turns and the radial dimension of the high-voltage coil in the high-voltage side winding two, so the average radius of the high-voltage coil a, the high-voltage coil b and the high-voltage coil two is equal, then the wire length and the direct current resistance of the high-voltage coil a, the high-voltage coil b and the high-voltage coil two are equal, and no circulating current is generated when the coils are connected in parallel; since the high-voltage coil is a one-section type, the materials and labor of the inter-section insulation and the end insulation are omitted, the space utilization of the wire is improved, the coil volume is reduced, the transformer volume is reduced, the manufacturing cost is reduced, the manufacturing difficulty is reduced, and the winding time is reduced. BRIEF DESCRIPTION OF DRAWINGS
[0012] The drawings are used to provide a further understanding of the utility model, and constitute a part of the specification, and are used together with the embodiments of the utility model to explain the utility model, and do not constitute the limitation on the utility model.
[0013] Figure 1 It is a structure schematic view of the one-section type coil in the traditional double-voltage transformer.
[0014] Figure 2 Structure diagram of segmented coil in traditional dual-voltage transformer;
[0015] Figure 3 Wiring principle diagram of segmented coil in traditional dual-voltage transformer;
[0016] Figure 4 Structure diagram of dual-voltage transformer;
[0017] Figure 5 Wiring principle diagram of dual-voltage transformer.
[0018] In the drawings: 1, low-voltage side winding, 2, closed iron core, 3, high-voltage side winding three, 4, high-voltage side winding four, 5, high-voltage side winding two, 6, high-voltage coil a, 7, high-voltage coil b. DETAILED DESCRIPTION
[0019] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.
[0020] It should be noted that, in this document, the terms such as first and second are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device.
[0021] As Figures 1-5As shown, a dual-voltage transformer comprises a high-voltage side winding, a low-voltage side winding 1 and a closed core 2, the high-voltage side winding and the low-voltage side winding 1 are respectively arranged in the closed core 2, the high-voltage side winding comprises a high-voltage side winding one and a high-voltage side winding two 5, the high-voltage side winding one is provided with two coils with equal number of turns, which are high-voltage coil a 6 and high-voltage coil b 7, the high-voltage coil a 6 is arranged at the inner side of the high-voltage side winding two 5, and the high-voltage coil b 7 is arranged at the outer side of the high-voltage side winding two 5, the high-voltage side winding two 5 is provided with a high-voltage coil two, the number of turns and the radial dimension of the high-voltage coil a 6 and the high-voltage coil b 7 are equal to those of the high-voltage coil in the high-voltage side winding two 5, and the high-voltage side winding one and the high-voltage side winding two 5 are connected in series or in parallel according to requirements.
[0022] The high-voltage coil a 6, the high-voltage coil b 7 and the high-voltage coil two are respectively provided with a head end and a tail end.
[0023] The tail end of the high-voltage coil a 6 is connected with the head end of the high-voltage coil b 7.
[0024] In the dual-voltage transformer, when the high-voltage side winding one and the high-voltage side winding two 5 are connected in parallel, the tail end of the high-voltage coil b 7 is connected with the head end of the high-voltage coil two.
[0025] In the dual-voltage transformer, when the high-voltage side winding one and the high-voltage side winding two 5 are connected in series, the head end of the high-voltage coil a 6 is connected with the head end of the high-voltage coil two, and the tail end of the high-voltage coil b 7 is connected with the tail end of the high-voltage coil two.
[0026] In specific use, when the high-voltage side winding one and the high-voltage side winding two 5 are connected in parallel, the tail end of the high-voltage coil b 7 is connected with the head end of the high-voltage coil two; when the high-voltage side winding one and the high-voltage side winding two 5 are connected in series, the head end of the high-voltage coil a 6 is connected with the head end of the high-voltage coil two, and the tail end of the high-voltage coil b 7 is connected with the tail end of the high-voltage coil two; the number of turns and the radial dimension of the high-voltage coil a 6 and the high-voltage coil b 7 are equal to those of the high-voltage coil in the high-voltage side winding two 5, so the average radius of the high-voltage coil a 6, the high-voltage coil b 7 and the high-voltage coil two is equal, and the wire length and the direct current resistance of the high-voltage coil a 6, the high-voltage coil b 7 and the high-voltage coil two are equal, so no circulating current is generated when the coils are connected in parallel; since the high-voltage coil is a segment type, the materials and labor for inter-segment insulation and end insulation are omitted, the space utilization of the wire is improved, the volume of the coil is reduced, the volume of the transformer is reduced, the manufacturing cost is reduced, the manufacturing difficulty is reduced, and the winding time is reduced.
[0027] Although the embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present application, the scope of which is defined by the appended claims and their equivalents. In general, if a person skilled in the art is inspired by the present application, without departing from the purpose of the present application, without creative design, similar structure and embodiments of the technical scheme should belong to the protection scope of the present application.
Claims
1. A dual voltage transformer, characterized by The double-voltage transformer comprises a high-voltage side winding, a low-voltage side winding and a closed iron core, the high-voltage side winding and the low-voltage side winding are arranged in the closed iron core respectively, the high-voltage side winding comprises a high-voltage side winding one and a high-voltage side winding two, two coils with equal number of turns are arranged in the high-voltage side winding one, which are high-voltage coil a and high-voltage coil b, the high-voltage coil a is arranged at the inner side of the high-voltage side winding two, the high-voltage coil b is arranged at the outer side of the high-voltage side winding two, the high-voltage side winding two is arranged with a high-voltage coil two, the number of turns and the radial dimension of the high-voltage coil a and the high-voltage coil b are equal to the number of turns and the radial dimension of the high-voltage coil in the high-voltage side winding two, the high-voltage side winding one and the high-voltage side winding two are connected in series or in parallel according to the requirement.
2. A dual voltage transformer according to claim 1, characterised in that The high-voltage coil a, the high-voltage coil b and the high-voltage coil two are respectively arranged with a head end and a tail end.
3. A dual voltage transformer according to claim 2, characterised in that The tail end of the high-voltage coil a and the head end of the high-voltage coil b are connected.
4. A dual voltage transformer according to claim 2, characterised in that In the double-voltage transformer, when the high-voltage side winding one and the high-voltage side winding two are connected in parallel, the tail end of the high-voltage coil b and the head end of the high-voltage coil two are connected.
5. A dual voltage transformer according to claim 2, characterised in that, In the double-voltage transformer, when the high-voltage side winding one and the high-voltage side winding two are connected in series, the head end of the high-voltage coil a and the head end of the high-voltage coil two are connected, and the tail end of the high-voltage coil b and the tail end of the high-voltage coil two are connected.