CN220254142U - Balance current device and system for three-phase voltage input and single-phase voltage output - Google Patents
Balance current device and system for three-phase voltage input and single-phase voltage output Download PDFInfo
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- CN220254142U CN220254142U CN202321851508.3U CN202321851508U CN220254142U CN 220254142 U CN220254142 U CN 220254142U CN 202321851508 U CN202321851508 U CN 202321851508U CN 220254142 U CN220254142 U CN 220254142U
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Abstract
The utility model belongs to the technical field of power electronics and transformers, and particularly relates to a balanced current device and a balanced current system for three-phase voltage input and single-phase voltage output, wherein the balanced current device comprises a current sharing output transformer component and a three-phase reactive current balancing component; the current-sharing output transformer component comprises a single-phase current-sharing transformer T1, a single-phase current-sharing transformer T2 and a single-phase current-sharing transformer T3; the three-phase reactive current balance assembly comprises a first balance module, a second balance module and a third balance module; the balancing module may consist of a tunable reactor and a parallel capacitor or of a single-phase static var generator SVG. When the power factor of the three-phase incoming line is 1 by adjusting the three-phase reactive current balance component or device, the three-phase input current achieves balance input and output, and the transformer loss and the line loss are effectively reduced; and when the three-phase transformer only supplies power to the single-phase load, full-load output can be realized, and the use efficiency of the transformer is improved.
Description
Technical Field
The utility model belongs to the technical field of power electronics and transformers, and particularly relates to a balanced current device and a balanced current system for three-phase voltage input and single-phase voltage output.
Background
The information disclosed in the background of the utility model is only for enhancement of understanding of the general background of the utility model and is not necessarily to be taken as an admission or any form of suggestion that this information forms the prior art already known to a person of ordinary skill in the art.
At present, a three-phase power supply system is adopted in China, a three-phase power supply design is adopted for a transformer, if the three-phase transformer is directly used for supplying power to a single-phase load, the transformer can only provide one third of rated capacity, the other two thirds of capacity is wasted, the output current of the transformer is seriously unbalanced at the moment, and for a distribution transformer adopting a star connection method, the transformer can be damaged due to the fact that zero sequence current is overlarge and zero sequence magnetic flux cannot be counteracted, so that the temperature of the transformer is increased.
Disclosure of Invention
In order to overcome the defects in the prior art, the utility model solves the problems that a conventional three-phase power supply transformer only can provide one third of rated capacity and three-phase current is seriously unbalanced when only supplying power to a single-phase load.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a balance current device for three-phase voltage input and single-phase voltage output comprises a current sharing output transformer component and a three-phase reactive current balance component;
the current-sharing output transformer component comprises a single-phase current-sharing transformer T1, a single-phase current-sharing transformer T2 and a single-phase current-sharing transformer T3;
the three-phase reactive current balance assembly comprises a first balance module, a second balance module and a third balance module;
the primary side first end T11 of the single-phase current equalizing transformer T1 is connected with the three-phase power UA end, the first end of the first balancing module and the first end of the third balancing module;
the primary side second end T12 of the single-phase current-sharing transformer T1 is connected with the primary side second end T22 of the single-phase current-sharing transformer T2;
the primary side second end T12 of the single-phase current-sharing transformer T1 is connected with the primary side first end T31 of the single-phase current-sharing transformer T3;
the first end T21 at one side of the single-phase current equalizing transformer T2 is connected with the three-phase power UB end, the second end of the first balancing module and the first end of the second balancing module;
the second end T32 at one side of the single-phase current sharing transformer T3 is connected with the third phase current UC end, the second end of the second balance Heng Mokuai and the second end of the third balance module;
the first end a1 of the secondary side of the single-phase current equalizing transformer T1 is connected with the output first end of the device;
the second end a2 of the secondary side of the single-phase current-sharing transformer T1 is connected with the first end b1 of the secondary side of the single-phase current-sharing transformer T2;
the second end a2 of the secondary side of the single-phase current-sharing transformer T1 is connected with the first end c1 of the secondary side of the single-phase current-sharing transformer T3;
the second end b2 of the secondary side of the single-phase current-sharing transformer T2 is connected with the second end c2 of the secondary side of the single-phase current-sharing transformer T3;
the second end c2 of the secondary side of the single-phase current equalizing transformer T3 is connected with the output second end of the device.
Preferably, the first balancing module of the three-phase reactive current balancing assembly comprises a tunable reactor L1 and a parallel capacitor C1, the second balancing module comprises a tunable reactor L2 and a parallel capacitor C2, and the third balancing module comprises a tunable reactor L3 and a parallel capacitor C3.
Preferably, the primary side first end T11 of the single-phase current equalizing transformer T1 is connected to the first end of the adjustable reactor L1 and the first end of the parallel capacitor C1 and the first end of the adjustable reactor L3 and the first end of the parallel capacitor C3;
the primary side first end T21 of the single-phase current equalizing transformer T2 is connected with the second end of the adjustable reactor L1 and the second end of the parallel capacitor C1;
the primary side first end T21 of the single-phase current equalizing transformer T2 is connected with the first end of the adjustable reactor L2 and the first end of the parallel capacitor C2;
the primary side second end T32 of the single-phase current equalizing transformer T3 is connected with the second end of the adjustable reactor L2 and the second end of the parallel capacitor C2, and the second end of the adjustable reactor L3 and the second end of the parallel capacitor C3.
Preferably, the first balancing module, the second balancing module and the third balancing module of the three-phase reactive current balancing assembly are respectively composed of three groups of single-phase Static Var Generators (SVGs).
Preferably, the three-phase reactive current balancing component comprises a single-phase static var generator (SVG 1), a single-phase static var generator (SVG 2) and a single-phase static var generator (SVG 3);
the primary side first end T11 of the single-phase current equalizing transformer T1 is connected with the first end of the single-phase static var generator SVG1 and the first end of the single-phase static var generator SVG3;
the primary side first end T21 of the single-phase current equalizing transformer T2 is connected with the second end of the single-phase static var generator SVG1 and the first end of the single-phase static var generator SVG 2;
the primary side second end T32 of the single-phase current equalizing transformer T3 is connected with the second end of the single-phase static var generator SVG2 and the second end of the single-phase static var generator SVG 3.
The beneficial effects are that: in the utility model, the balance current device for three-phase voltage input and single-phase voltage output mainly consists of two parts, wherein the first part is a three-phase reactive current balance device, and when the power factor of a three-phase incoming line is 1, the three-phase input current reaches balance input by adjusting a three-phase reactive current balance component or device; the second part is a current equalizing output transformer;
when the three-phase transformer only supplies power to the single-phase load, full-load output can be realized, and the use efficiency of the transformer is improved;
when only supplying power to the single-phase load, the balanced output of the three-phase current can be realized, and the transformer loss and the line loss are effectively reduced.
By adjusting the three-phase reactive current balancing device, the output power factor of the three-phase transformer is 1, and the energy-saving effect of the power grid is improved.
In order to overcome the defects in the prior art, the utility model also provides a system comprising the balance current device with any three-phase voltage input and single-phase voltage output.
The use efficiency of the transformer is improved, the transformer loss and the line loss are effectively reduced, and the energy-saving effect of the power grid is improved.
Drawings
FIG. 1 is a schematic diagram of a circuit connection of a balanced current device with three-phase voltage input and single-phase voltage output;
fig. 2 is a schematic diagram of another circuit connection of a balanced current device with three-phase voltage input and single-phase voltage output.
Reference numerals referred to in the drawings are:
1. a current equalizing output transformer assembly; 2. a three-phase reactive current balance assembly.
Detailed Description
In order that those skilled in the art will better understand the present utility model, the following technical scheme of the present utility model will be further described with reference to the accompanying drawings and examples.
FIGS. 1 and 2 show a balanced current device for three-phase voltage input and single-phase voltage output, comprising a current sharing output transformer assembly 1 and a three-phase reactive current balancing assembly 2;
the current-sharing output transformer component 1 comprises a single-phase current-sharing transformer T1, a single-phase current-sharing transformer T2 and a single-phase current-sharing transformer T3;
the three-phase reactive current balance assembly 2 comprises a first balance module, a second balance module and a third balance module;
the primary side first end T11 of the single-phase current equalizing transformer T1 is connected with the three-phase power UA end, the first end of the first balancing module and the first end of the third balancing module;
the primary side second end T12 of the single-phase current-sharing transformer T1 is connected with the primary side second end T22 of the single-phase current-sharing transformer T2;
the primary side second end T12 of the single-phase current-sharing transformer T1 is connected with the primary side first end T31 of the single-phase current-sharing transformer T3;
the first end T21 at one side of the single-phase current equalizing transformer T2 is connected with the three-phase power UB end, the second end of the first balancing module and the first end of the second balancing module;
the second end T32 at one side of the single-phase current sharing transformer T3 is connected with the third phase current UC end, the second end of the second balance Heng Mokuai and the second end of the third balance module;
the first end a1 of the secondary side of the single-phase current equalizing transformer T1 is connected with the output first end of the device;
the second end a2 of the secondary side of the single-phase current-sharing transformer T1 is connected with the first end b1 of the secondary side of the single-phase current-sharing transformer T2;
the second end a2 of the secondary side of the single-phase current-sharing transformer T1 is connected with the first end c1 of the secondary side of the single-phase current-sharing transformer T3;
the second end b2 of the secondary side of the single-phase current-sharing transformer T2 is connected with the second end c2 of the secondary side of the single-phase current-sharing transformer T3;
the second end c2 of the secondary side of the single-phase current equalizing transformer T3 is connected with the output second end of the device.
In the utility model, the balance current device for three-phase voltage input and single-phase voltage output mainly consists of two parts, wherein the first part is a three-phase reactive current balance component 2 or device, and when the power factor of a three-phase incoming line is 1, the three-phase input current reaches balance input through adjusting the three-phase reactive current balance device; the second part is a current equalizing output transformer component 1;
when the three-phase transformer only supplies power to the single-phase load, full-load output can be realized, and the use efficiency of the transformer is improved;
when only supplying power to the single-phase load, the balanced output of the three-phase current can be realized, and the transformer loss and the line loss are effectively reduced.
By adjusting the three-phase reactive current balancing device, the output power factor of the three-phase transformer is 1, and the energy-saving effect of the power grid is improved.
In a preferred further embodiment, specifically, as shown in fig. 1, the first balancing module of the three-phase reactive current balancing assembly 2 includes a tunable reactor L1 and a parallel capacitor C1, the second balancing module includes a tunable reactor L2 and a parallel capacitor C2, and the third balancing module includes a tunable reactor L3 and a parallel capacitor C3.
The primary side first end T11 of the single-phase current equalizing transformer T1 is connected with the first end of the adjustable reactor L1, the first end of the parallel capacitor C1, the first end of the adjustable reactor L3 and the first end of the parallel capacitor C3;
the primary side first end T21 of the single-phase current equalizing transformer T2 is connected with the second end of the adjustable reactor L1 and the second end of the parallel capacitor C1;
the primary side first end T21 of the single-phase current equalizing transformer T2 is connected with the first end of the adjustable reactor L2 and the first end of the parallel capacitor C2;
the primary side second end T32 of the single-phase current equalizing transformer T3 is connected with the second end of the adjustable reactor L2 and the second end of the parallel capacitor C2, and the second end of the adjustable reactor L3 and the second end of the parallel capacitor C3.
In another embodiment, as shown in fig. 2, the first balancing module, the second balancing module and the third balancing module of the three-phase reactive current balancing assembly 2 are respectively composed of three groups of single-phase static reactive generators SVG.
Specifically, the three-phase reactive current balance assembly 2 includes a single-phase static var generator SVG1, a single-phase static var generator SVG2 and a single-phase static var generator SVG3;
the primary side first end T11 of the single-phase current equalizing transformer T1 is connected with the first end of the single-phase static var generator SVG1 and the first end of the single-phase static var generator SVG3;
the primary side first end T21 of the single-phase current equalizing transformer T2 is connected with the second end of the single-phase static var generator SVG1 and the first end of the single-phase static var generator SVG 2;
the primary side second end T32 of the single-phase current equalizing transformer T3 is connected with the second end of the single-phase static var generator SVG2 and the second end of the single-phase static var generator SVG 3.
In another embodiment, a system includes the above-described balanced current device with three-phase voltage input and single-phase voltage output. The use efficiency of the transformer is improved, the transformer loss and the line loss are effectively reduced, and the energy-saving effect of the power grid is improved.
In the present specification, each embodiment is described in a progressive manner, and each embodiment focuses on the difference from other embodiments, and the same and similar parts between the embodiments are only required to be referred to each other.
The terms "upper", "lower", "outside", "inside", and the like in the description and in the claims of the present utility model and in the above drawings, if any, are used for distinguishing between relative relationships in position and not necessarily for giving qualitative sense. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the utility model described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present utility model. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present utility model is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (6)
1. A balanced current device of three-phase voltage input single-phase voltage output is characterized in that: the current sharing output transformer comprises a current sharing output transformer component (1) and a three-phase reactive current balancing component (2);
the current-sharing output transformer component (1) comprises a single-phase current-sharing transformer T1, a single-phase current-sharing transformer T2 and a single-phase current-sharing transformer T3;
the three-phase reactive current balance assembly (2) comprises a first balance module, a second balance module and a third balance module;
the primary side first end T11 of the single-phase current equalizing transformer T1 is connected with the three-phase power UA end, the first end of the first balancing module and the first end of the third balancing module;
the primary side second end T12 of the single-phase current-sharing transformer T1 is connected with the primary side second end T22 of the single-phase current-sharing transformer T2;
the primary side second end T12 of the single-phase current-sharing transformer T1 is connected with the primary side first end T31 of the single-phase current-sharing transformer T3;
the first end T21 at one side of the single-phase current equalizing transformer T2 is connected with the three-phase power UB end, the second end of the first balancing module and the first end of the second balancing module;
the second end T32 at one side of the single-phase current sharing transformer T3 is connected with the third phase current UC end, the second end of the second balance Heng Mokuai and the second end of the third balance module;
the first end a1 of the secondary side of the single-phase current equalizing transformer T1 is connected with the output first end of the device;
the second end a2 of the secondary side of the single-phase current-sharing transformer T1 is connected with the first end b1 of the secondary side of the single-phase current-sharing transformer T2;
the second end a2 of the secondary side of the single-phase current-sharing transformer T1 is connected with the first end c1 of the secondary side of the single-phase current-sharing transformer T3;
the second end b2 of the secondary side of the single-phase current-sharing transformer T2 is connected with the second end c2 of the secondary side of the single-phase current-sharing transformer T3;
the second end c2 of the secondary side of the single-phase current equalizing transformer T3 is connected with the output second end of the device.
2. The balanced current device for three-phase voltage input single-phase voltage output according to claim 1, wherein:
the three-phase reactive current balance assembly (2) comprises a first balance module, a second balance module and a third balance module, wherein the first balance module comprises an adjustable reactor L1 and a parallel capacitor C1, the second balance module comprises an adjustable reactor L2 and a parallel capacitor C2, and the third balance module comprises an adjustable reactor L3 and a parallel capacitor C3.
3. The balanced current device for three-phase voltage input single-phase voltage output according to claim 2, wherein:
the primary side first end T11 of the single-phase current equalizing transformer T1 is connected with the first end of the adjustable reactor L1, the first end of the parallel capacitor C1, the first end of the adjustable reactor L3 and the first end of the parallel capacitor C3;
the primary side first end T21 of the single-phase current equalizing transformer T2 is connected with the second end of the adjustable reactor L1 and the second end of the parallel capacitor C1;
the primary side first end T21 of the single-phase current equalizing transformer T2 is connected with the first end of the adjustable reactor L2 and the first end of the parallel capacitor C2;
the primary side second end T32 of the single-phase current equalizing transformer T3 is connected with the second end of the adjustable reactor L2 and the second end of the parallel capacitor C2, and the second end of the adjustable reactor L3 and the second end of the parallel capacitor C3.
4. The balanced current device for three-phase voltage input single-phase voltage output according to claim 1, wherein:
the first balance module, the second balance module and the third balance module of the three-phase reactive current balance assembly (2) are respectively composed of three groups of single-phase Static Var Generators (SVGs).
5. The balanced current apparatus for three-phase voltage input single-phase voltage output according to claim 4, wherein:
the three-phase reactive current balance assembly (2) comprises a single-phase static var generator (SVG 1), a single-phase static var generator (SVG 2) and a single-phase static var generator (SVG 3);
the primary side first end T11 of the single-phase current equalizing transformer T1 is connected with the first end of the single-phase static var generator SVG1 and the first end of the single-phase static var generator SVG3;
the primary side first end T21 of the single-phase current equalizing transformer T2 is connected with the second end of the single-phase static var generator SVG1 and the first end of the single-phase static var generator SVG 2;
the primary side second end T32 of the single-phase current equalizing transformer T3 is connected with the second end of the single-phase static var generator SVG2 and the second end of the single-phase static var generator SVG 3.
6. A balanced current system of three-phase voltage input single-phase voltage output is characterized in that: a balanced current device comprising a three-phase voltage input single-phase voltage output according to any one of claims 1 to 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321851508.3U CN220254142U (en) | 2023-07-14 | 2023-07-14 | Balance current device and system for three-phase voltage input and single-phase voltage output |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321851508.3U CN220254142U (en) | 2023-07-14 | 2023-07-14 | Balance current device and system for three-phase voltage input and single-phase voltage output |
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| CN220254142U true CN220254142U (en) | 2023-12-26 |
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| CN202321851508.3U Active CN220254142U (en) | 2023-07-14 | 2023-07-14 | Balance current device and system for three-phase voltage input and single-phase voltage output |
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- 2023-07-14 CN CN202321851508.3U patent/CN220254142U/en active Active
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