CN101640120A - Transformer changing from three phases to single phase - Google Patents
Transformer changing from three phases to single phase Download PDFInfo
- Publication number
- CN101640120A CN101640120A CN200910158593A CN200910158593A CN101640120A CN 101640120 A CN101640120 A CN 101640120A CN 200910158593 A CN200910158593 A CN 200910158593A CN 200910158593 A CN200910158593 A CN 200910158593A CN 101640120 A CN101640120 A CN 101640120A
- Authority
- CN
- China
- Prior art keywords
- phase
- winding
- transformer
- phase winding
- phases
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Abstract
The invention discloses a transformer changing from three phases to single phase, aiming at solving the problems that three-phase balance of a power supply system is affected and the user operationalcost is increased when a flash butt welder is applied in the prior art. In the transformer changing from three phases to single phase, an external terminal comprises three power input ends and two power output ends; the internal structure comprises a first single-phase transformer and a second single-phase transformer, wherein a terminal of a primary winding of the first single-phase transformer is connected with a first phase power input end and the other terminal is connected with a midpoint of a primary winding of the second single-phase transformer; two terminals of a primary winding of the second single-phase transformer are respectively connected with a second phase power input end and a third phase power input end; a secondary winding of the first single-phase transformer and a secondary winding of the second single-phase transformer are connected in series between two power output ends; and the second single-phase transformer adopts a connection manner for enhancing the self-coupling degree of a second phase winding and a third phase winding.
Description
Technical field
The present invention relates to the transformer technology field, relate in particular to a kind of transformer changing from three phases to single phase.
Background technology
Present high-power type flash butt welding machine power supply is provided by the common power transformer of three phase transformation three-phases.
In realizing process of the present invention, the inventor finds that there are the following problems at least in the prior art: because the welding machine single-phase power is bigger, three-phase transformer is the single phasing mode during welding, causes block supply system severe three-phase imbalance.Simultaneously, also increased user's operating cost, promptly the capacity of the common power transformer of three-phase increases 1.5 times, and basic charge as per installed capacity also increases by 1.5 times.
Summary of the invention
The invention provides a kind of transformer changing from three phases to single phase, it can not influence the three-phase equilibrium of electric power system, can reduce user's operating cost simultaneously.
For achieving the above object, the present invention adopts following technical scheme:
A kind of transformer changing from three phases to single phase, its outside terminal comprise three power inputs and two power output ends, and described three power inputs are respectively the first phase power input, the second phase power input and third phase power input;
The internal structure of described transformer changing from three phases to single phase comprises first single-phase transformer and second single-phase transformer, wherein,
Power input is continuous mutually with described first for a terminal of a winding of described first single-phase transformer, another terminal links to each other with the mid point of a winding of described second single-phase transformer, two terminals of a winding of described second single-phase transformer respectively with described second mutually power input link to each other with the third phase power input, thereby a winding of described first single-phase transformer forms first phase winding, and a winding of described second single-phase transformer forms second phase winding and third phase winding;
The secondary windings in series of the secondary winding of described first single-phase transformer and described second single-phase transformer is connected between described two power output ends;
Adopt described second phase winding of enhancing and third phase winding connected mode on described second single-phase transformer from the degree of coupling.
Further, described second phase winding of described enhancing and third phase winding are from the connected mode of the degree of coupling, be specially: described second phase winding and third phase winding overlap each other and are arranged on two iron cores, and second phase winding part that is positioned on the same iron core is opposite with third phase winding induced electromotive force direction partly.
Further, described second phase winding of described enhancing and third phase winding are from the connected mode of the degree of coupling, be specially: described second phase winding and third phase winding adopt two post connect in parallel modes respectively, and second phase winding part that is positioned on the same iron core is opposite with third phase winding induced electromotive force direction partly.
Further, described second phase winding of described enhancing and third phase winding are specially from the connected mode of the degree of coupling: described second phase winding and third phase winding are arranged on separately respectively on two iron cores, and also are provided with the balance winding on described two iron cores.
Further, described transformer changing from three phases to single phase is an oil-filled transformer.
Transformer changing from three phases to single phase provided by the invention, its primary side T type connects, secondary side is connected in series, thereby can become single phase poaer supply to three phase mains, simultaneously, on second single-phase transformer, adopt enhancing second phase winding and third phase winding connected mode among the present invention from the degree of coupling, can reduce the reactance of second phase winding and third phase winding like this, reduce the caused voltage landing of second phase winding and third phase winding, guaranteed the balance of this transformer changing from three phases to single phase primary side voltage, thereby the present invention can not influence the three-phase equilibrium of electric power system, can also reduce user's operating cost simultaneously.
Description of drawings
Fig. 1 is the structural principle schematic diagram of transformer changing from three phases to single phase of the present invention;
Fig. 2 is the tie lines and the schematic diagram of T type tie lines transformer;
Fig. 2 a is tie lines figure, and Fig. 2 b is a schematic diagram;
Fig. 3 is the current distributing figure that T becomes the other full load of M variation in the T type tie lines;
Fig. 3 a is the current distributing figure of T when becoming fully loaded and M and becoming unloaded, and Fig. 3 b is the current distributing figure of M when becoming fully loaded and T and becoming unloaded;
Fig. 4 becomes the CURRENT DISTRIBUTION and the phasor diagram of equal full load for T change, M in the T type tie lines;
Fig. 4 a is the current distributing figure that T becomes, M becomes equal full load, and Fig. 4 b is that T becomes, M becomes the secondary side current phasor diagram, and Fig. 4 c is a primary side three-phase current phasor diagram, and Fig. 4 d is that primary side B reaches C phase current composite phasor figure mutually;
Fig. 5 arranges irrational situation schematic diagram for M becomes a winding;
Fig. 6 is for becoming a kind of tie lines figure that primary impedance is taked for reducing M among the present invention;
Fig. 7 is for becoming the another kind of tie lines figure that primary impedance is taked for reducing M among the present invention;
Fig. 8 is for becoming another tie lines figure that primary impedance is taked for reducing M among the present invention.
Embodiment
When solving that flash butt welding machine is used in the prior art, influenced the three-phase equilibrium of electric power system, increased the problem of user's operating cost, the invention provides a kind of transformer changing from three phases to single phase.Below in conjunction with accompanying drawing the present invention is described in detail.
Transformer changing from three phases to single phase provided by the invention, as shown in Figure 1, the outside terminal of this transformer changing from three phases to single phase comprises three power inputs (A, B and C) and two power output ends (a and b), and three power inputs are respectively the first phase power input A, the second phase power input B and third phase power input C;
The internal structure of this transformer changing from three phases to single phase comprises first single-phase transformer (the pairing transformer of ADad) and second single-phase transformer (the pairing transformer of BCbc), wherein,
Power input A is continuous mutually with first for a terminal of a winding of first single-phase transformer, another terminal links to each other with the mid point D of a winding of second single-phase transformer, two terminals of a winding of second single-phase transformer respectively with second mutually power input B link to each other with third phase power input C, thereby a winding of first single-phase transformer forms the first phase winding AD (being the A phase winding), and a winding of second single-phase transformer forms second phase winding BD (being the B phase winding) and third phase winding CD (being the C phase winding);
The secondary winding of first single-phase transformer is connected between two power output end a, the b with the secondary windings in series (be connected in series and see that a little c, d among Fig. 1 are connected) of second single-phase transformer;
Adopt enhancing second phase winding BD and third phase winding CD connected mode on second single-phase transformer from the degree of coupling.
Transformer changing from three phases to single phase of the present invention, its primary side T type connects, secondary side is connected in series, thereby can become single phase poaer supply to three phase mains, simultaneously, on second single-phase transformer, adopt enhancing second phase winding BD and third phase winding CD connected mode among the present invention from the degree of coupling, can reduce by the reactance of the second phase winding BD and third phase winding CD like this, reduce the caused voltage landing of the second phase winding BD and third phase winding CD, guaranteed the balance of this transformer changing from three phases to single phase primary side voltage, thereby the present invention can not influence the three-phase equilibrium of electric power system, can also reduce user's operating cost simultaneously.
Introduce T type of the present invention below earlier and connect pairing T type tie lines transformer principle:
T type tie lines can become single phase poaer supply to three phase mains, forms by being called two single-phase transformers that T becomes and M becomes usually, and its tie lines figure and schematic diagram are respectively shown in Fig. 2 a and Fig. 2 b.
Shown in Fig. 3 a and Fig. 3 b, be respectively in the T type tie lines that T becomes fully loaded and M becomes unloaded, and the current distributions of M when becoming fully loaded and T and becoming unloaded.The supposition transformer voltage ratio is 1 among Fig. 3, and load current is 100.
Fig. 4 becomes the CURRENT DISTRIBUTION and the phasor diagram of equal full load for T change, M in the T type tie lines.As can be seen from Figure 4, flow through two kinds of electric currents in primary side B phase, the C phase winding, i.e. the electric current and the T of M change 100% become 50% electric current.And these two kinds of senses of current are vertical mutually, so synthetic back size is the same with the A phase current, also are 115.5.This moment, each phase current of primary side was:
Wherein, i
A, i
B, i
C---primary side three-phase current (A)
U1---primary voltage (V)
U2---secondary voltage (V)
i
2M---M becomes secondary current (A)
i
2T---T becomes secondary current (A)
i
2---M becomes, T becomes the secondary current (A) after synthesizing.
By top as can be known various, identical at the secondary side load characteristic, and under the load current equal and opposite in direction situation, the equal and opposite in direction of primary side three-phase current and direction differs from 120 °.Among the present invention, promptly be that the secondary side winding with two single-phase transformers is in series, thereby make that the secondary side load characteristic is identical that the load current equal and opposite in direction has guaranteed the current balance of secondary winding; According to conservation of energy principle, first side winding also satisfies the equilibrium of three phase mains.Again because the rated capacity of transformer of the present invention is according to the rated power design of application apparatus (as flash butt welding machine), so it is all fully loaded to guarantee that M becomes, T becomes output.
And for impedance, not ideal enough if M becomes a winding construction layout, it is excessive impedance then can to occur, causes the primary side three-phase voltage seriously to distort.Shown in Figure 5, be winding of a kind of M change and arrange irrational situation.
Be not difficult to find out that from Fig. 4 and Fig. 5 flow to M and become two 57.75 electric currents in winding two arms one time from winding of T change, the magnetic potential that is produced does not all obtain balance in each iron core column.The result is for the electric current that advances from the T unsteady flow, and B, the C two big reactance winding that coordinated produces very big pressure drop under load, cause the serious imbalance of primary side voltage.Must manage to increase B, C phase winding degree of coupling separately, to reduce the voltage landing for this reason.
The present invention has adopted to increase B, the C phase winding connected mode of degree of coupling separately on second single-phase transformer, reduced the reactance of B, C phase winding, B, the caused voltage landing of C phase winding have been reduced, guaranteed the balance of this transformer changing from three phases to single phase primary side voltage, so, the present invention can not influence the three-phase equilibrium of electric power system, can also reduce user's operating cost simultaneously.
Among the present invention,, can adopt following three kinds of methods for increasing the coupling degree certainly of B, C phase winding:
First method: as shown in Figure 6, two half one time windings that M becomes adopt the arrangement mode that overlaps each other:
B phase winding and C phase winding overlap each other and are arranged on two iron cores, and the B winding part that is positioned on the same iron core is opposite with C phase winding induced electromotive force direction partly.
Second method: as shown in Figure 7, two half one time windings that M becomes adopt two post connect in parallel modes:
B winding and C winding adopt two post connect in parallel modes respectively, and the B phase winding part that is positioned on the same iron core is opposite with C phase winding induced electromotive force direction partly.
The third method: as shown in Figure 8, set up the balance winding during M becomes:
B phase winding and C phase winding are arranged on separately respectively on two iron cores, and also are provided with the balance winding on described two iron cores.
Above-mentioned three kinds of increases are from the connected mode of coupling, all can reduce the reactance of B, C phase winding, reduce B, the caused voltage landing of C phase winding, guarantee the balance of this transformer changing from three phases to single phase primary side voltage, thereby can not influence the three-phase equilibrium of electric power system, reduced the interference of harmonic wave, can also reduce user's operating cost simultaneously the electric power system electrical network.In addition, the connected mode that increases from coupling is not limited to above-mentioned three kinds, other modes is not given unnecessary details one by one herein.
Among the present invention, transformer changing from three phases to single phase is preferably oil-filled transformer, to satisfy the cooling requirement.Device has M to become and the T change in fuel tank, and iron core that comprises and coil etc.High-low pressure is drawn transformer, is electrically connected with electric power system and flash butt welding machine respectively, and high pressure installs shunting switch additional.
When transformer changing from three phases to single phase of the present invention was applied to flash butt welding machine, the capacity of transformer and the power match of flash butt welding machine got final product, and need not to install 1.5 times of rated capacity common transformers.Transformer becomes the single phase poaer supply energy with system's three phase mains power conversion, and three-phase system is symmetrical all the time during the flash butt welding machine welding.Therefore, the present invention can solve the unbalanced problem of power supply in the prior art, simultaneously, also can the power conditioner network, reduce and pollute, save 1/3rd operating cost expense.
Transformer changing from three phases to single phase of the present invention is applicable to the application scenario of the high-power single phase poaer supply of various needs, and being specially adapted to provides power supply for high-power type flash butt welding machine.
The above; only be the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; can expect easily changing or replacing, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of described claim.
Claims (5)
1, a kind of transformer changing from three phases to single phase, it is characterized in that, the outside terminal of described transformer changing from three phases to single phase comprises three power inputs and two power output ends, and described three power inputs are respectively the first phase power input, the second phase power input and third phase power input;
The internal structure of described transformer changing from three phases to single phase comprises first single-phase transformer and second single-phase transformer, wherein,
Power input is continuous mutually with described first for a terminal of a winding of described first single-phase transformer, another terminal links to each other with the mid point of a winding of described second single-phase transformer, two terminals of a winding of described second single-phase transformer respectively with described second mutually power input link to each other with the third phase power input, thereby a winding of described first single-phase transformer forms first phase winding, and a winding of described second single-phase transformer forms second phase winding and third phase winding;
The secondary windings in series of the secondary winding of described first single-phase transformer and described second single-phase transformer is connected between described two power output ends;
Adopt described second phase winding of enhancing and third phase winding connected mode on described second single-phase transformer from the degree of coupling.
2, transformer changing from three phases to single phase according to claim 1 is characterized in that, described second phase winding of described enhancing and third phase winding are specially from the connected mode of the degree of coupling:
Described second phase winding and third phase winding overlap each other and are arranged on two iron cores, and second phase winding part that is positioned on the same iron core is opposite with third phase winding induced electromotive force direction partly.
3, transformer changing from three phases to single phase according to claim 1 is characterized in that, described second phase winding of described enhancing and third phase winding are specially from the connected mode of the degree of coupling:
Described second phase winding and third phase winding adopt two post connect in parallel modes respectively, and second phase winding part that is positioned on the same iron core is opposite with third phase winding induced electromotive force direction partly.
4, transformer changing from three phases to single phase according to claim 1 is characterized in that, described second phase winding of described enhancing and third phase winding are specially from the connected mode of the degree of coupling:
Described second phase winding and third phase winding are arranged on separately respectively on two iron cores, and also are provided with the balance winding on described two iron cores.
According to the described transformer changing from three phases to single phase of arbitrary claim in the claim 1 to 4, it is characterized in that 5, described transformer changing from three phases to single phase is an oil-filled transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910158593A CN101640120A (en) | 2009-07-20 | 2009-07-20 | Transformer changing from three phases to single phase |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910158593A CN101640120A (en) | 2009-07-20 | 2009-07-20 | Transformer changing from three phases to single phase |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101640120A true CN101640120A (en) | 2010-02-03 |
Family
ID=41615050
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910158593A Pending CN101640120A (en) | 2009-07-20 | 2009-07-20 | Transformer changing from three phases to single phase |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101640120A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103578716A (en) * | 2013-10-18 | 2014-02-12 | 东莞市光华实业有限公司 | Conjugate high-efficiency transformer for changing three-phase power supply into single-phase power supply |
| CN105827119A (en) * | 2016-06-15 | 2016-08-03 | 国网青海省电力公司 | Automatic voltage stabilizing transformer |
| CN107680784A (en) * | 2017-10-31 | 2018-02-09 | 山东华宁电伴热科技有限公司 | A kind of kelvin effect Scott transformers |
| CN109065338A (en) * | 2018-09-12 | 2018-12-21 | 成都尚华电气有限公司 | A kind of homo-phase traction transformer |
| CN113852070A (en) * | 2021-09-09 | 2021-12-28 | 中铁二院工程集团有限责任公司 | Traction and electric power hybrid power supply system for alternating current electrified rail transit engineering |
-
2009
- 2009-07-20 CN CN200910158593A patent/CN101640120A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103578716A (en) * | 2013-10-18 | 2014-02-12 | 东莞市光华实业有限公司 | Conjugate high-efficiency transformer for changing three-phase power supply into single-phase power supply |
| CN103578716B (en) * | 2013-10-18 | 2016-03-02 | 东莞市光华实业有限公司 | Conjugation-type high-efficiency three-phase becomes single-phase transformer |
| CN105827119A (en) * | 2016-06-15 | 2016-08-03 | 国网青海省电力公司 | Automatic voltage stabilizing transformer |
| CN107680784A (en) * | 2017-10-31 | 2018-02-09 | 山东华宁电伴热科技有限公司 | A kind of kelvin effect Scott transformers |
| CN109065338A (en) * | 2018-09-12 | 2018-12-21 | 成都尚华电气有限公司 | A kind of homo-phase traction transformer |
| CN109065338B (en) * | 2018-09-12 | 2023-10-03 | 成都尚华电气有限公司 | In-phase traction transformer |
| CN113852070A (en) * | 2021-09-09 | 2021-12-28 | 中铁二院工程集团有限责任公司 | Traction and electric power hybrid power supply system for alternating current electrified rail transit engineering |
| CN113852070B (en) * | 2021-09-09 | 2023-09-22 | 中铁二院工程集团有限责任公司 | Traction and power hybrid power supply system for alternating current electric rail transit engineering |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104465053B (en) | A kind of high-capacity three-phase combination type phase-shifting transformer | |
| CN1971778B (en) | Single-phase self-coupling on-load voltage-regulating transformer | |
| CN101640120A (en) | Transformer changing from three phases to single phase | |
| CN103811159A (en) | Four split transformer | |
| CN201498348U (en) | Triphase-to-single-phase transformer | |
| CN103811160A (en) | Four split transformer | |
| CN204117774U (en) | A kind of transformer with split winding | |
| CN106130020A (en) | A kind of series compensation device being applicable to double-circuit line | |
| CN208013316U (en) | frequency converter test platform | |
| CN100479074C (en) | Star-ladder type wiring three-phase to two phase balance transformer | |
| CN203325665U (en) | Frequency-conversion phase-shift rectifier transformer | |
| CN202363228U (en) | 500kV-grade three-phase three-winding excitation-free pressure regulating high-impedance power transformer | |
| CN202084409U (en) | Inverse Scott dry type transformer | |
| CN202473566U (en) | 6kV-10kV dual-voltage conversion input dry type power distribution transformer | |
| CN204215878U (en) | A kind of high-capacity three-phase composite type phase shifting transformer | |
| CN202906805U (en) | Special transformer compensating soft start device for large power cage type motor | |
| CN102568766A (en) | Conjugated rectifier transformer device | |
| CN202178138U (en) | Three-split rectifier transformer | |
| CN201975222U (en) | Asymmetrical wiring balanced transformer | |
| CN105225805A (en) | T wiring balancing transformer | |
| CN203351392U (en) | Transformer with four split windings | |
| CN2594948Y (en) | Electric reactor with three-phase parallel cores | |
| WO2024082371A1 (en) | Three-phase high-voltage shunt reactor capable of being used for cable withstand voltage test, and design method | |
| CN102983795A (en) | TBEA compensation soft starting device used for large power cage type motor | |
| CN2935410Y (en) | Three-phase five-limb double anti-star epoxide resin casting rectification dry-type transformer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20100203 |