CN113571315A - Three-phase to single-phase transformer - Google Patents
Three-phase to single-phase transformer Download PDFInfo
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- CN113571315A CN113571315A CN202010357443.1A CN202010357443A CN113571315A CN 113571315 A CN113571315 A CN 113571315A CN 202010357443 A CN202010357443 A CN 202010357443A CN 113571315 A CN113571315 A CN 113571315A
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- phase
- winding
- secondary winding
- primary winding
- transformer
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F30/00—Fixed transformers not covered by group H01F19/00
- H01F30/06—Fixed transformers not covered by group H01F19/00 characterised by the structure
- H01F30/12—Two-phase, three-phase or polyphase transformers
- H01F30/14—Two-phase, three-phase or polyphase transformers for changing the number of phases
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Ac-Ac Conversion (AREA)
Abstract
The invention relates to a three-phase to single-phase transformer, which comprises a primary winding and a secondary winding, wherein the primary winding comprises an A-phase primary winding and a C-phase primary winding, one homonymous end of the A-phase primary winding is connected with one heteronymous end of the C-phase primary winding, and a terminal for connecting a B-phase is led out of the connection position; the secondary winding comprises an A-phase secondary winding and a C-phase secondary winding, and one dotted terminal of the A-phase secondary winding is connected with one dotted terminal of the C-phase secondary winding. The transformer can solve the problem of unbalanced three-phase current, and has simple design and manufacture and low cost.
Description
Technical Field
The invention relates to a three-phase to single-phase transformer, and belongs to the technical field of power transformers.
Background
At present, a single-phase power supply is needed for general electric appliance power supplies or lighting power supplies of various machine tools, mechanical equipment and the like, so that three-phase power supply is neededThe source becomes a single phase power supply. Three live wires and one zero wire are arranged on the secondary side of the three-phase distribution transformer, and the use method of directly taking single-phase electricity by using the live wires and the zero wires can cause unbalanced three-phase current because if single-phase electricity is taken from any one phase and the zero phase of A, B, C, the current of one phase is
S is rated capacity, UThreadThe other two-phase current is 0 for the rated line voltage. Moreover, when single-phase power is directly obtained by using the live wire and the zero wire, the live wire has potential difference with the ground, and electric shock accidents are easily caused. The Scott transformer is used as a traditional three-phase to single-phase transformer, and is mainly used as a traction transformer due to the complex main wiring, more used equipment, high manufacturing difficulty and high manufacturing cost.
Disclosure of Invention
The invention aims to provide a three-phase to single-phase transformer, which is used for solving the problem of unbalanced three-phase current caused by directly using a live wire and a zero line to obtain single-phase electricity.
In order to solve the technical problem, the invention provides a three-phase to single-phase transformer, which comprises a primary winding and a secondary winding, wherein the primary winding comprises an A-phase primary winding and a C-phase primary winding, one same-name end of the A-phase primary winding is connected with one different-name end of the C-phase primary winding, and a terminal for connecting a B-phase is led out of the connection position; the secondary winding comprises an A-phase secondary winding and a C-phase secondary winding, and one dotted terminal of the A-phase secondary winding is connected with one dotted terminal of the C-phase secondary winding.
The invention has the beneficial effects that: two different name ends of primary windings of the two-phase windings are connected together, and a terminal is led out at the connection position to be connected with the other phase voltage of the three-phase voltage, when single-phase electricity is taken from any one phase and zero phase of A, B, C, two-phase current on the primary side is the same as that on the primary side
The other phase current is
S is rated capacity, UThreadThe transformer is rated line voltage, the problem of unbalanced three-phase current can be solved, and the transformer is simple in wiring, easy to realize and low in cost.
Further, for convenience of arrangement, the primary winding and the secondary winding are coaxially sleeved.
Further, still include three-phase iron core, primary winding and secondary winding set up on the both sides iron core of three-phase iron core.
Furthermore, the number of turns of the phase A primary winding is equal to that of the phase C primary winding, and the number of turns of the phase A secondary winding is equal to that of the phase C secondary winding.
Further, the three-phase iron core is made of silicon steel or amorphous alloy materials.
Drawings
FIG. 1 is a schematic diagram of the wiring of a three-phase to single-phase transformer of the present invention;
FIG. 2 is a schematic diagram of a three-phase to single-phase transformer according to the present invention;
FIG. 3 is a vector diagram of the primary voltage of the three-phase to single-phase transformer of the present invention;
FIG. 4 is a vector diagram of the secondary voltage of the three-phase to single-phase transformer of the present invention;
wherein: 1 is an A-phase winding, 2 is an iron core, and 3 is a C-phase winding.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
The embodiment provides a three-phase to single-phase transformer, which comprises a middle iron core, two side iron cores and A, C phase windings, wherein the A, C phase windings are respectively arranged on the two side iron cores, and the middle iron core is not provided with the windings. The A, C phase windings each comprise a primary winding and a secondary winding, the number of turns WA of the A phase primary winding is equal to the number of turns WC of the C phase primary winding, the number of turns Wa of the A phase secondary winding is equal to the number of turns WC of the C phase secondary winding, namely WA-WC and Wa-WC.
As shown in fig. 1, a dotted terminal of the a-phase primary winding is connected to a dotted terminal of the C-phase primary winding, and a connection point (the connection point may be the dotted terminal or the dotted terminal, or any point of a line connecting both terminals) of the connection point is led out for connecting the B-phase voltage, and the other two terminals of the A, C-phase primary winding are respectively used for connecting the a-phase voltage and the C-phase voltage. One dotted terminal of the A-phase secondary winding is connected with one dotted terminal of the C-phase secondary winding, and the other two terminals of the A, C-phase secondary winding are used for connecting single-phase voltage.
As shown in fig. 2, the three-phase to single-phase transformer has a three-pole structure, wherein 1 is an a-phase winding formed by winding a primary winding and a secondary winding; 3 is a C-phase winding, and is also formed by winding a primary winding and a secondary winding; the A, C phase winding is wound on the iron cores on the two sides in a sleeving manner, and the middle iron core is not wound with the winding in the sleeving manner. Of course, as other embodiments, the primary winding and the secondary winding may be arranged not coaxially, and the iron core may be made of other materials as needed.
For the above three-phase to single-phase transformer, the voltage relationship is shown in fig. 3, the line voltages of each phase of the primary winding of the transformer are equal, and the phase difference is 120 °; as shown in FIG. 4, the secondary output voltage of the transformer is synthesized from the phase voltages, and the secondary output voltage is equal to the phase voltages
Double, namely:
UAB＝UBC＝UCA
wherein, UAB、UBC、UCAThe primary line voltage Uac is the secondary output voltage of the transformer, and the secondary phase voltages Uao and Uco are the voltage of the primary line.
For the above three-phase to single-phase transformer, the relationship of the primary current is: the phase B current is equal to the sum of the phase A current and the phase C current, namely:
wherein the content of the first and second substances,
phase current for transformer primary A, B, C.
When single-phase electricity is taken from any one phase of A, B, C and zero phase, the phase current A, C of the three-phase single-phase transformer is equal to
Phase B current of
S is rated capacity, UThreadThe transformer is rated line voltage, so that the problem of unbalanced three-phase current is solved, and the transformer is simple in wiring, easy to realize and low in cost.
In the three-phase to single-phase transformer, the two-phase windings are respectively disposed on the iron cores on both sides. As another embodiment, one phase winding may be provided on the intermediate core and the other phase winding may be provided on one of the side cores. The three-phase-change single-phase transformer is simpler in design and manufacture than a Scott transformer, low in cost, capable of solving the problem of serious unbalance of three-phase current in a specific load occasion, and applicable to general electric appliance power supplies, lighting power supplies and the like of various machine tools, mechanical equipment and the like.
Claims (5)
1. The three-phase to single-phase transformer is characterized by comprising a primary winding and a secondary winding, wherein the primary winding comprises an A-phase primary winding and a C-phase primary winding, one homonymous end of the A-phase primary winding is connected with one heteronymous end of the C-phase primary winding, and a terminal for connecting the B-phase is led out of the connection position; the secondary winding comprises an A-phase secondary winding and a C-phase secondary winding, and one dotted terminal of the A-phase secondary winding is connected with one dotted terminal of the C-phase secondary winding.
2. The three-to-single phase transformer of claim 1, wherein the primary winding and the secondary winding are coaxially sleeved.
3. The three-phase to single-phase transformer according to claim 1 or 2, further comprising a three-phase core, wherein the primary winding and the secondary winding are disposed on both sides of the three-phase core.
4. The three-to-single phase transformer according to claim 1 or 2, wherein the number of turns of the a-phase primary winding is equal to the number of turns of the C-phase primary winding, and the number of turns of the a-phase secondary winding is equal to the number of turns of the C-phase secondary winding.
5. The three-phase to single-phase transformer of claim 1 or 2, wherein the three-phase iron core is silicon steel or amorphous alloy material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010357443.1A CN113571315A (en) | 2020-04-29 | 2020-04-29 | Three-phase to single-phase transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010357443.1A CN113571315A (en) | 2020-04-29 | 2020-04-29 | Three-phase to single-phase transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113571315A true CN113571315A (en) | 2021-10-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010357443.1A Pending CN113571315A (en) | 2020-04-29 | 2020-04-29 | Three-phase to single-phase transformer |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1043584A (en) * | 1988-12-14 | 1990-07-04 | 李智慧 | Three-phase is imported the transformer of single-phase output |
| JPH0898527A (en) * | 1994-09-27 | 1996-04-12 | Matsushita Electric Works Ltd | Transformer |
| CN203026332U (en) * | 2012-12-12 | 2013-06-26 | 浙江弘乐电气有限公司 | Three-phase to single-phase conversion device |
| CN103824688A (en) * | 2014-03-18 | 2014-05-28 | 上海意兰可电力电子设备有限公司 | Filter transformer with three phases changed into single phase |
-
2020
- 2020-04-29 CN CN202010357443.1A patent/CN113571315A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1043584A (en) * | 1988-12-14 | 1990-07-04 | 李智慧 | Three-phase is imported the transformer of single-phase output |
| JPH0898527A (en) * | 1994-09-27 | 1996-04-12 | Matsushita Electric Works Ltd | Transformer |
| CN203026332U (en) * | 2012-12-12 | 2013-06-26 | 浙江弘乐电气有限公司 | Three-phase to single-phase conversion device |
| CN103824688A (en) * | 2014-03-18 | 2014-05-28 | 上海意兰可电力电子设备有限公司 | Filter transformer with three phases changed into single phase |
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