CN1037130C - 3-phase symmetrically-inputting single phase power supply transformer - Google Patents
3-phase symmetrically-inputting single phase power supply transformer Download PDFInfo
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- CN1037130C CN1037130C CN93111253A CN93111253A CN1037130C CN 1037130 C CN1037130 C CN 1037130C CN 93111253 A CN93111253 A CN 93111253A CN 93111253 A CN93111253 A CN 93111253A CN 1037130 C CN1037130 C CN 1037130C
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- phase
- power supply
- supply transformer
- transformer
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Abstract
The present invention relates to a three-phase symmetrical input power supply transformer with a single-phase load, wherein the three-phase windings of primary sides A, B and C are connected into a triangle, and secondary sides is composed of two-phase symmetrical windings with d composed of a1, b and c1 and q composed of a2 and c2 and a phase shifter. The three-phase symmetrical input power supply transformer can automatically eliminate negative sequence magnetic potential which is variable along with load variation and the non-symmetrical influence of a single-phase load to a three-phase power supply. The present invention does not adopt any electronic device with high power and has the advantages of simple structure, convenient maintenance and reliable operation. Particularly, the three-phase symmetrical input power supply transformer can output relatively ideal voltage wave shapes. During no need of a single-phase power supply, the present invention can be switched into an ordinary three-phase output transformer at any time.
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 illuminator tool, 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.
Traditional elimination negative phase-sequence magnetic potential measure 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 require 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.
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 influence of single-phase load to three phase mains; Its output voltage waveforms is more satisfactory.When not needing, can also set up one group of switch, switch to general three-phase output transformer easily and use with single phase poaer supply.
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 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.The polarity of " ※ " symbolic representation coil.
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 force E ' d, E ' q 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 E ' d ' is promptly spent by phase shift 90 and translates into the output potential E ' q ' of q ' winding, because q ' forward connects with the q winding, E ' q ' and E ' d 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 1 position, soon E ' d ', E ' q ' feed are 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.
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
1) composition (d) and (a
2), (c
2) two-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 and rotor n, (d ') of the quadrature that distributing on the stator, (q ') two cover windings.
3. the single phase power supply transformer of three symmetrical inputs according to claim 2, the rotor that it is characterized in that described phase shifter is squirrel-cage and Wound-rotor type.
4. the single phase power supply transformer of three symmetrical inputs according to claim 3 is characterized in that fixed value compensation electric capacity (C) is gone up and be connected to the winding (d ') of described phase shifter.
5. the single phase power supply transformer of three symmetrical inputs according to claim 3 is characterized in that the pairing magnetic pole logarithm of same leg speed of the rotor (n) of described phase shifter is preferably 3 or 4.
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 CN1095855A (en) | 1994-11-30 |
| CN1037130C true 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) |
Families Citing this family (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 |
| CN109215977B (en) * | 2018-09-12 | 2023-09-29 | 西南交通大学 | Traction-compensation transformer |
| CN109936233B (en) * | 2019-01-08 | 2024-06-11 | 中铁电气化局集团有限公司 | Alternating current phase-changing motor for changing two-phase symmetrical alternating current into single-phase alternating current |
| CN112924830A (en) * | 2021-03-04 | 2021-06-08 | 国网山西省电力公司电力科学研究院 | Transformer three-phase partial discharge simultaneous pressurization test device and test method based on single-phase variable frequency power supply |
Citations (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 |
| CN2163435Y (en) * | 1993-04-12 | 1994-04-27 | 曲思廉 | Spot welder 3-phase balance transformer |
| CN1092200A (en) * | 1993-03-11 | 1994-09-14 | 陈端生 | Three/one, two covert, transformers |
-
1993
- 1993-05-25 CN CN93111253A patent/CN1037130C/en not_active Expired - Fee Related
Patent Citations (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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1095855A (en) | 1994-11-30 |
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