CN109741924B - Traction transformer - Google Patents
Traction transformer Download PDFInfo
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- CN109741924B CN109741924B CN201910162863.1A CN201910162863A CN109741924B CN 109741924 B CN109741924 B CN 109741924B CN 201910162863 A CN201910162863 A CN 201910162863A CN 109741924 B CN109741924 B CN 109741924B
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Abstract
The invention provides an electrified railway traction transformer, and belongs to the technical field of alternating current electrified railway power supply. The middle tap terminal X2 is led out between the two end terminals X1 and X3 of one phase winding of the two-phase winding, the tap terminal Y2 is led out between the two end terminals Y1 and Y3 of the primary side of the other phase winding at a position which is 0.866 times of the total number of turns of the winding by taking Y3 as a reference, namely three terminals are independently led out of the transformer on the primary side of the two windings. After the primary side terminals X3 and Y1 are connected, three-phase voltages of an electric power system are respectively connected with the terminals X1 and Y3, the other terminals are suspended, and when the traction transformer works in the Vv wiring mode, the secondary side two ports respectively supply power to traction loads of the two independent power supply arms a and b. After the primary side terminals X2 and Y2 are connected, the terminals X1, X3 and Y3 are respectively connected with three-phase voltage of the power system, the other terminals are suspended, and when the traction transformer works in a Scott wiring, the secondary side two ports respectively supply power to traction loads of the two independent power supply arms a and b.
Description
Technical Field
The invention belongs to the technical field of alternating current electrified railway power supply.
Background
As the main part of the traction power supply system for carrying out electric energy conversion, the traction transformer can adopt different wiring modes to meet different requirements, and the traction transformers with different wiring modes have the characteristics in performance. However, the current traction transformer is manufactured by only considering a specific wiring mode, and only adopting the wiring mode in the service life period. If one traction transformer can form different wiring modes, the requirements of different traction substations can be met. In addition, with the development of railway operation, to adapt to changing operation demands, certain modification and upgrading of existing lines are required. In the transformation process, the traction transformer is retired due to the fact that the capacity of the traction transformer does not meet the requirement, and how to fully utilize the traction transformer which does not reach the upper limit of the service life is of great significance in improving the running economy of a traction power supply system.
As a main part of the traction power supply system, which is responsible for the conversion of electrical energy, the traction transformer directly influences the operating state of the traction power supply system. The prior applied Vv wiring traction transformer is characterized in that two terminals are respectively arranged on the primary sides of two-phase windings, wherein each phase winding is connected with one terminal in the transformer, three binding posts are led out of the primary sides and are respectively connected with A, B, C three phases of an electric power system, two ports of the secondary sides output two different line voltages with the phase difference of 60 degrees or 120 degrees, and two independent traction loads are respectively supplied with power; one phase winding of the Scott wiring traction transformer is provided with two terminals, the other phase winding is led out of a middle tap except for a first terminal and a last terminal, the other phase winding is connected with one terminal of the two terminal windings, the primary side is led out of three binding posts which are respectively connected with A, B, C three phases of a power system, and two ports of the secondary side output two different line voltages with 90 degrees of phase difference to respectively supply power to two independent traction loads.
The existing traction transformer only considers a specific wiring mode during manufacturing, and only adopts the wiring mode in the service life period. In order to meet the requirements of users on traction transformers in different wiring modes, different production lines are needed, and more manpower and material resources are occupied. In addition, with the development of railway operation, to adapt to changing operation demands, certain modification and upgrading of existing lines are required. In the transformation process, the traction transformer is retired because the capacity does not meet the requirement, so that the service life of the transformer is fully utilized, the traction transformer which does not reach the upper limit of the service life can be used for other traction substations, but the traction substation is required to adopt the same wiring mode, and the limitation is larger. If the same traction transformer can form different wiring modes, not only can different user demands be met, but also the production line can be simplified, and the production efficiency can be improved; meanwhile, the limitation of the application range can be reduced, and the service life of the traction transformer can be better exerted.
Disclosure of Invention
The invention aims to provide a traction transformer, which can effectively solve the technical problem that the same transformer forms a Vv wiring traction transformer or a Scott wiring traction transformer by changing external wiring, and meets the requirements of different traction substations on the wiring modes of the traction transformers.
The invention solves the technical problems, and adopts the technical proposal that:
a traction transformer: the three-phase winding is determined according to the requirement of a Vv wiring traction transformer on the iron core, the two-phase windings are respectively arranged on iron core columns on two sides of the three-phase iron core, in the two-phase windings, a middle tap X2 terminal is led out at the middle position between an X1 terminal and an X3 terminal at the two ends of the primary side of an X-phase winding, a tap Y2 terminal is led out at the position 0.866 times of the total number of turns by taking the Y3 terminal as a reference, namely, the primary sides of X, Y windings are respectively provided with three terminals and are respectively led out of the transformer independently; when the traction transformer works in a Vv wiring operation state, an X1 terminal of the primary side of the X-phase winding, an X3 terminal of the primary side of the X-phase winding and a Y3 terminal of the primary side of the Y-phase winding are connected into a three-phase power system, the X3 terminal of the primary side of the X-phase winding is connected with a Y1 terminal of the primary side of the Y-phase winding, and an X2 terminal and a Y2 terminal are suspended; the two ports of the secondary side respectively and independently supply power to traction loads of the power supply arm a and the power supply arm b; when the traction transformer works in the Scott wiring operation state, an X1 terminal of the primary side of the X-phase winding, an X3 terminal of the primary side of the X-phase winding and a Y3 terminal of the primary side of the Y-phase winding are connected into a three-phase power system, an X2 terminal of the primary side of the X-phase winding is connected with a Y2 terminal of the primary side of the Y-phase winding, the Y1 terminal is suspended, and traction loads of the two ports of the secondary side are respectively supplied with power by a unidirectional power supply arm a and a unidirectional power supply arm b.
The primary sides of the X, Y windings are respectively provided with three terminals which are respectively and independently led out of the transformer, and the Vv wiring mode or the Scott wiring mode is formed by changing external wiring.
The working principle of the invention is as follows:
the primary sides of the Vv wiring traction transformer and the Scott wiring traction transformer are connected into the three-phase voltage of the electric power system, but the voltages of the two-phase windings of the Vv wiring traction transformer are different by 60 degrees or 120 degrees due to the different connection modes of the terminals, and the voltages of the two-phase windings of the Scott wiring traction transformer are different by 90 degrees. The terminal connection mode is changed by leading out the middle tap of the one-phase winding, so that the requirements of the Vv wiring traction transformer and the Scott wiring traction transformer on the voltage phases of the two windings can be met.
The transformation ratio of the primary side and the secondary side of the two-phase winding of the Vv wiring traction transformer is the same, one phase winding transformation ratio of the Scott wiring traction transformer is the same as that of the Vv wiring traction transformer, and the transformation ratio of the other phase winding transformation ratio is different from that of the Vv wiring traction transformer. Therefore, the tap is led out from the other phase winding which is not led out from the middle tap at the position of 0.866 times of the total number of turns of the winding, the terminal connection mode is changed, different transformation ratios can be realized, and different requirements of the Vv wiring traction transformer and the Scott wiring traction transformer on the transformation ratios of the windings are met.
When the traction transformer forms a Vv wiring or a Scott wiring by changing an external wiring, the running states of the transformer are different, and the difference is mainly reflected in the superposition result of the magnetic fluxes of the iron cores. Because the voltage phase relation of the primary side access is different, the magnetic flux passing through the intermediate phase iron core column in the Vv wiring operation state is larger than that of the intermediate phase iron core column in the Scott wiring operation state. The magnetic flux of the core column where the winding is located is related to the voltage accessed by the primary side of the winding and the number of turns of the coil contained in the winding, so that the magnetic fluxes of the core columns at two sides of the traction transformer are consistent in the Vv wiring operation state and the Scott wiring operation state, the maximum value of the magnetic fluxes of the iron core when the Vv wiring traction transformer is formed is taken as a limit value, the effective sectional area of the iron core of the transformer is determined, the phenomenon of magnetic saturation of the iron core can be avoided, and the traction transformer can normally work in the Vv wiring operation state or the Scott wiring operation state.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention can work in two states, namely Vv wiring and Scott wiring, one traction transformer can meet different requirements of different traction substations on the wiring modes of the traction transformer, and the application range is wide.
2. The invention can be carried out on the basis of the prior art, does not increase the difficulty in the process and does not increase the material cost.
3. The invention can simplify the production line and improve the production efficiency while maintaining the applicability and the richness of the product.
4. The invention is applied to new line construction without increasing construction investment; when the circuit is reformed, equipment which does not reach the upper limit of the service life can be fully utilized, the wiring mode of the traction transformer is changed to adapt to different requirements, the service life of the traction transformer is fully exerted, and the economical efficiency is good.
Drawings
Fig. 1 is a schematic view of a winding terminal of the present invention.
FIG. 2 is a schematic view of the invention in terms of Vv wiring.
FIG. 3 is a schematic diagram of the embodiment of the invention for forming a Scott connection.
Fig. 4 is a schematic view of the core, winding arrangement and flux distribution of the present invention.
Detailed Description
Examples the invention is further described below with reference to the drawings and detailed description.
Fig. 1 shows that one embodiment of the present invention is: a traction transformer: the three-phase winding is determined according to the requirement of a Vv wiring traction transformer on the iron core, the two-phase windings are respectively arranged on iron core columns on two sides of the three-phase iron core, in the two-phase windings, a middle tap X2 terminal is led out at the middle position between an X1 terminal and an X3 terminal at the two ends of the primary side of an X-phase winding, a tap Y2 terminal is led out at the position 0.866 times of the total number of turns by taking the Y3 terminal as a reference, namely, the primary sides of X, Y windings are respectively provided with three terminals and are respectively led out of the transformer independently; when the traction transformer works in a Vv wiring operation state, an X1 terminal of the primary side of the X-phase winding, an X3 terminal of the primary side of the X-phase winding and a Y3 terminal of the primary side of the Y-phase winding are connected into a three-phase power system, the X3 terminal of the primary side of the X-phase winding is connected with a Y1 terminal of the primary side of the Y-phase winding, and an X2 terminal and a Y2 terminal are suspended; the two ports of the secondary side respectively and independently supply power to traction loads of the power supply arm a and the power supply arm b; when the traction transformer works in the Scott wiring operation state, an X1 terminal of the primary side of the X-phase winding, an X3 terminal of the primary side of the X-phase winding and a Y3 terminal of the primary side of the Y-phase winding are connected into a three-phase power system, an X2 terminal of the primary side of the X-phase winding is connected with a Y2 terminal of the primary side of the Y-phase winding, the Y1 terminal is suspended, and traction loads of the two ports of the secondary side are respectively supplied with power by a unidirectional power supply arm a and a unidirectional power supply arm b.
The primary sides of the X, Y windings are respectively provided with three terminals which are respectively and independently led out of the transformer, and the Vv wiring mode or the Scott wiring mode is formed by changing external wiring.
Fig. 2 shows a Vv connection mode formed by the traction transformer according to the embodiment of the present invention, after the primary side terminals X3 and Y1 are connected, the primary side terminals X1 and Y3 are connected to the A, B, C three phases of the power system respectively, the remaining terminals are suspended, the traction transformer works in the Vv connection operation state, and the secondary side two ports supply power to the traction loads of the two independent power supply arms a and b respectively.
Fig. 3 shows a Scott connection mode formed by the traction transformer according to the embodiment of the present invention, after the primary side terminals X2 and Y2 are connected, the terminals X1, X3, Y3 are respectively connected to A, B, C three phases of the power system, the remaining terminals are suspended, the traction transformer works in the Scott connection operation state, and the secondary side two ports respectively supply power to traction loads of the two independent power supply arms a and b.
Fig. 4 is a schematic diagram of an iron core, winding arrangement and magnetic flux distribution according to an embodiment of the present invention, where two-phase windings are respectively arranged on core legs on two sides of a three-phase iron core.
Claims (2)
1. A traction transformer: the three-phase winding is determined according to the requirements of the Vv wiring traction transformer on the iron core, and the two-phase winding is respectively arranged on iron core columns on two sides of the three-phase iron core, and is characterized in that: in the two-phase winding, a middle tap X2 terminal is led out from the center position between an X1 terminal and an X3 terminal at the two ends of the primary side of the X-phase winding, a tap Y2 terminal is led out from the position 0.866 times of the total number of turns by taking the Y3 terminal as a reference between a Y1 terminal and a Y3 terminal at the two ends of the primary side of the Y-phase winding, namely, the primary sides of the X, Y windings are respectively provided with three terminals and are led out to the outside of the transformer independently; when the traction transformer works in a Vv wiring operation state, an X1 terminal of the primary side of the X-phase winding, an X3 terminal of the primary side of the X-phase winding and a Y3 terminal of the primary side of the Y-phase winding are connected into a three-phase power system, the X3 terminal of the primary side of the X-phase winding is connected with a Y1 terminal of the primary side of the Y-phase winding, and an X2 terminal and a Y2 terminal are suspended; the two ports of the secondary side respectively and independently supply power to traction loads of the power supply arm a and the power supply arm b; when the traction transformer works in the Scott wiring operation state, an X1 terminal of the primary side of the X-phase winding, an X3 terminal of the primary side of the X-phase winding and a Y3 terminal of the primary side of the Y-phase winding are connected into a three-phase power system, an X2 terminal of the primary side of the X-phase winding is connected with a Y2 terminal of the primary side of the Y-phase winding, the Y1 terminal is suspended, and traction loads of the two ports of the secondary side are respectively supplied with power by a unidirectional power supply arm a and a unidirectional power supply arm b.
2. A traction transformer as claimed in claim 1, wherein: the primary sides of the X, Y windings are respectively provided with three terminals which are respectively and independently led out of the transformer, and the Vv wiring mode or the Scott wiring mode is formed by changing external wiring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910162863.1A CN109741924B (en) | 2019-03-05 | 2019-03-05 | Traction transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910162863.1A CN109741924B (en) | 2019-03-05 | 2019-03-05 | Traction transformer |
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| Publication Number | Publication Date |
|---|---|
| CN109741924A CN109741924A (en) | 2019-05-10 |
| CN109741924B true CN109741924B (en) | 2023-09-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910162863.1A Active CN109741924B (en) | 2019-03-05 | 2019-03-05 | Traction transformer |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110517873B (en) * | 2019-09-30 | 2024-03-26 | 西南交通大学 | Traction-compensation transformer |
Citations (4)
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| JP2007129135A (en) * | 2005-11-07 | 2007-05-24 | Shinyosha:Kk | Phase-shifting voltage regulator |
| CN101635197A (en) * | 2009-05-31 | 2010-01-27 | 湖南大学 | Harmonic shielding Vv connection traction balancing transformer |
| CN108682541A (en) * | 2018-04-26 | 2018-10-19 | 西南交通大学 | A kind of tractive transformer |
| CN209297901U (en) * | 2019-03-05 | 2019-08-23 | 西南交通大学 | A kind of tractive transformer |
-
2019
- 2019-03-05 CN CN201910162863.1A patent/CN109741924B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007129135A (en) * | 2005-11-07 | 2007-05-24 | Shinyosha:Kk | Phase-shifting voltage regulator |
| CN101635197A (en) * | 2009-05-31 | 2010-01-27 | 湖南大学 | Harmonic shielding Vv connection traction balancing transformer |
| CN108682541A (en) * | 2018-04-26 | 2018-10-19 | 西南交通大学 | A kind of tractive transformer |
| CN209297901U (en) * | 2019-03-05 | 2019-08-23 | 西南交通大学 | A kind of tractive transformer |
Non-Patent Citations (4)
| Title |
|---|
| 《Leakage Flux and Force Calculation on Power Transformer Windings under Short-circuit: 2D and 3D Models based on the Theory of Images and the Finite Element Method Compared to Measurements》;Antonios G. Kladas, Michael P. Papadopoulos and John A. Tegopoulos;IEEE TRANSACTIONS ON MAGNETICS;第3487-3490页 * |
| AT牵引供电方式的分析及应用;徐红红;张雷;;铁道运营技术(04);第8-11页 * |
| 不同牵引变压器接线方式的应用研究;王金浩;薛磊;李蒙赞;王述仲;;现代电力(01);第33-39页 * |
| 基于斯科特变压器的新型同相AT牵引供电***;张秀峰;连级三;;机车电传动(04);第14-18页 * |
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