CN1095855A - The single phase power supply transformer of three symmetrical inputs - Google Patents
The single phase power supply transformer of three symmetrical inputs Download PDFInfo
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- CN1095855A CN1095855A CN 93111253 CN93111253A CN1095855A CN 1095855 A CN1095855 A CN 1095855A CN 93111253 CN93111253 CN 93111253 CN 93111253 A CN93111253 A CN 93111253A CN 1095855 A CN1095855 A CN 1095855A
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- phase
- transformer
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- rotor
- power supply
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Abstract
The present invention relates to a kind of supply transformer of single-phase load of three symmetrical inputs.Its primary side A, B, C three phase windings are connected into triangle, and secondary side is by a
1, b, c
1Form d and by a
2, c
2Two-phase symmetric winding and the phase shifter of forming q constitute.This transformer is automatically eliminated the negative phase-sequence magnetic potential that is changing with load change, has eliminated the asymmetric influence of single-phase load to three phase mains.The present invention does not adopt any high-power electronic device, and it is simple in structure, easy to maintenance, reliable, and especially output voltage waveforms is more satisfactory.In the time need not using single phase poaer supply, also can switch to general three-phase output transformer at any time and use.
Description
The present invention relates to a kind of supply transformer of single-phase load, the three-phase input current symmetry of its primary side, the single-phase output current of secondary side can change with load variations.
In the prior art, single-phase load (for example lighting, electric welding machine, single-phase electricfurnace, electric tool, Monophase electric power pulling equipment etc.) is for the three phase supply transformer, be a kind of asymmetric load, can cause the asymmetric of three phase mains that degree is different, influence power supply quality.Press the symmetrical component method analysis, its reason is that the single-phase load electric current has formed the negative phase-sequence magnetic potential in the three-phase transformer magnetic circuit; Simultaneously provable, rely on merely between Circuit Fault on Secondary Transformer three phase windings self differently to connect or adopt certain special three-phase magnetic circuit, all can not fundamentally eliminate this negative phase-sequence magnetic potential.
The measure of traditional elimination negative phase-sequence magnetic potential is to adopt inductance, capacity cell to compensate, and promptly provides a reciprocal negative phase-sequence magnetic potential to offset the negative phase-sequence magnetic potential that load current causes.This method is simple, reliable, but requires load constant, and promptly load impedance angle and amplitude need keep definite value, otherwise, just should regulate inductance, capacitance at any time along with the change of load.When requiring to regulate automatically, sampling, comparison must be set, amplify and obey link certainly, thereby become quite complicated.
Employing " balancing transformer " is also arranged, the three-phase input current symmetry of its primary side, secondary side is connected into two symmetrical outputs, can allow load to change arbitrarily.But it uses prerequisite, must keep two phase loads all the time and equate (impedance angle and amplitude be correspondent equal respectively) fully.And in actual applications, make two load impedances equate very difficult fully or even can't realize, therefore, greatly limited applying of this " balancing transformer ".
In view of above problem, task of the present invention has provided a kind of novel single phase power supply transformer that can automatically eliminate the negative phase-sequence magnetic potential that is changing with load change.When using this transformer, no matter how the single-phase load impedance changes, the three-phase input current of transformer can remain quite high symmetry.
Basic design of the present invention is: with the phase voltage in the two-phase output winding of existing " balancing transformer ", by a phase shifter phase shift 90 degree, result and another phase voltage same-phase with they series connection additions, thereby constitute single-phase out-put supply.Because effects such as phase shifter and compensation condensers, the negative sequence component in the two-phase output current of transformer is eliminated thus.
Accompanying drawing is circuit theory diagrams of the present invention.
Be described in detail structure of the present invention below in conjunction with accompanying drawing:
As shown in drawings, [1] is balancing transformer, and [2] are change over switch, and [3] are phase shifter, and [4] are load impedance.Primary side A, the B of balancing transformer, C three phase windings are connected into triangle (preferably not being connected into star), and each phase total number of turns of a of secondary side, b, c three phase windings equates that wherein a, c two phase windings are divided into a separately
1, a
2And c
1, c
2Two sections, two sections turn ratio is 1: 0.366.By a
1, b, c
1Form d and by a
2, c
2Form q two-phase symmetric winding.Phase shifter is made of stator (or interior external stator) and rotor n, the d ' of the orthogonal space that distributing in the stator laminated core and q ' two cover windings.On d ' winding and be connected to fixed value compensation electric capacity c; Rotor is squirrel-cage (comprising hollow cup-shaped rotor) or Wound-rotor type.When needing, on the axle radiator fan can be installed.Its building-out capacitor c has different tap stepping values respectively with d ' umber of turn when the needs acquisition is highly symmetrical.Rotor can be in (by self asynchronous torque driving) under the metasynchronism speed or with (driven) running under the leg speed by coaxial mounted low capacity synchronous motor.The pairing magnetic pole logarithm of the same leg speed of rotor is preferably 3 or 4.
Implementation process of the present invention is as follows:
As shown in the figure: when three phase mains puts on the balancing transformer primary side, will induce two symmetrical electromotive forces in its secondary side d, the q winding
Because the d winding of balancing transformer and the d ' winding of phase shifter are in parallel electromotive force
Promptly spent and convert the output potential of q ' winding to by phase shift 90
, because q ' forward connects with the q winding,
With
The electromotive force same-phase, thus constituted single-phase out-put supply.As insert load impedance [4], then transformer enters the single-phase load running status.
Before transformer output monophase current, should be earlier with the rotor startup of phase shifter [3] to metasynchronism speed or same leg speed.When relying on self-starting, need the handle of change over switch [2] is placed the position of I, be about to
Feed is given d, the q winding of phase shifter, just as the startup of two-phase motor.Wait to start and finish, the state that again handle is placed the position of II promptly to run well.As starting with coaxial low capacity synchronous motor, then this handle can be in " neutrality " state at the beginning, waits to enter with behind the leg speed, places the position of II again.After this should keep the rotor stability running, to eliminate the negative phase-sequence magnetic potential.
The present invention does not adopt any high-power electronic device, and it is simple in structure, and is easy to maintenance, reliable. Its outstanding feature is that no matter how the amplitude of single-phase load and impedance angle change, the three-phase input current of supply transformer remains gratifying symmetry, has eliminated the Asymmetric ef-fect of single-phase load to three phase mains; Its output voltage waveforms is more satisfactory. When not needing with single phase poaer supply, can also set up one group of switch, switch to easily general three-phase output transformer and use.
Claims (5)
1, the single phase power supply transformer of three symmetrical inputs, its primary side A, B, C three phase windings are connected into triangle, it is characterized in that secondary side is by a
1, b, c
1Form d and a
2, c
2Two-phase symmetric winding and the phase shifter of forming q constitute.
2, according to claim 1 three symmetrical input single phase power supply transformers is characterized in that described phase shifter is to be made of stator (or interior external stator) and rotor n, the d ' of the quadrature that distributing on the stator (or interior external stator), q ' two cover windings.
3, phase shifter according to claim 2 is characterized in that described rotor is squirrel-cage and Wound-rotor type.
4, according to claims 3 described phase shifters, it is characterized in that, on d ' winding and be connected to fixed value compensation electric capacity c.
5,, it is characterized in that the pairing magnetic pole logarithm of same leg speed of rotor n is preferably 3 or 4 according to claims 3 described phase shifters.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN93111253A CN1037130C (en) | 1993-05-25 | 1993-05-25 | 3-phase symmetrically-inputting single phase power supply transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN93111253A CN1037130C (en) | 1993-05-25 | 1993-05-25 | 3-phase symmetrically-inputting single phase power supply transformer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1095855A true CN1095855A (en) | 1994-11-30 |
| CN1037130C CN1037130C (en) | 1998-01-21 |
Family
ID=4989052
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN93111253A Expired - Fee Related CN1037130C (en) | 1993-05-25 | 1993-05-25 | 3-phase symmetrically-inputting single phase power supply transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1037130C (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105118639A (en) * | 2015-09-09 | 2015-12-02 | 申国华 | Star-shaped, reverse open-triangular and triangular tie line combined traction transformer |
| CN105609276A (en) * | 2016-02-26 | 2016-05-25 | 中国人民解放军海军工程大学 | Marine three-phase-into-two-phase balancing transformer |
| CN109215977A (en) * | 2018-09-12 | 2019-01-15 | 西南交通大学 | A kind of traction-compensator transformer |
| CN109936233A (en) * | 2019-01-08 | 2019-06-25 | 中铁电气化局集团有限公司第二工程分公司 | A kind of two-phase symmetrical alternating current electricity becomes the covert motor of exchange of single-phase alternating current |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2140554Y (en) * | 1992-10-17 | 1993-08-18 | 汪明伟 | Dual-purpose 3-phase or single phase transformer |
| CN1092200A (en) * | 1993-03-11 | 1994-09-14 | 陈端生 | Three/one, two covert, transformers |
| CN2163435Y (en) * | 1993-04-12 | 1994-04-27 | 曲思廉 | Spot welder 3-phase balance transformer |
-
1993
- 1993-05-25 CN CN93111253A patent/CN1037130C/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105118639A (en) * | 2015-09-09 | 2015-12-02 | 申国华 | Star-shaped, reverse open-triangular and triangular tie line combined traction transformer |
| CN105609276A (en) * | 2016-02-26 | 2016-05-25 | 中国人民解放军海军工程大学 | Marine three-phase-into-two-phase balancing transformer |
| CN109215977A (en) * | 2018-09-12 | 2019-01-15 | 西南交通大学 | A kind of traction-compensator transformer |
| CN109215977B (en) * | 2018-09-12 | 2023-09-29 | 西南交通大学 | Traction-compensation transformer |
| CN109936233A (en) * | 2019-01-08 | 2019-06-25 | 中铁电气化局集团有限公司第二工程分公司 | A kind of two-phase symmetrical alternating current electricity becomes the covert motor of exchange of single-phase alternating current |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1037130C (en) | 1998-01-21 |
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