Two-phase-to-three-phase transformer
By designing a two-phase three-phase transformer, the transformation between two-phase and three-phase is achieved, which solves the problem of difficulty in using DC ice melting devices in the railway system, and improves the deicing efficiency and the safety of railway operation.
Patent Information
- Application Number
- CN202411671099.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-21
- Publication Date
- 2025-03-14
AI Technical Summary
In the railway system, the traction transformer is generally used for two phases, and it is difficult to directly use the DC ice melting device, resulting in low ice melting efficiency of the railway electrified contact network, affecting the normal operation of the railway.
A two-phase transformation three-phase transformer is designed. By setting up a three-pillar core and coil group, the transformation between two phases and three phases is achieved, and the application range of three-phase power is expanded and suitable for power supply of DC ice melting devices.
The two phases of the traction transformer of the railway system are transformed into three phases, which facilitates the use of DC ice melting devices, improves the deicing efficiency of the railway system and improves the safety of the railway system operation.
Smart Images
Figure CN119626727A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of transformers, and in particular relates to a two-phase to three-phase transformer. Background Art
[0002] In recent years, the construction of electrified railways has developed rapidly. New high-power AC / DC electric locomotives have gradually become the main models of electrified railways in my country, especially high-speed railways. The traction power supply system is used to provide electricity for high-speed trains, which directly affects the safe, reliable and efficient operation of trains. With the change of global temperature, the frequency of extreme weather has increased. The southern, central and eastern regions of my country have experienced ice and snow freezing disasters that are rare in history. Most areas of Hunan, Guizhou and Jiangxi provinces have been particularly severely affected, causing varying degrees of damage to local power facilities. The electrified railway is prone to ice formation in the electrified contact network due to the large interval between train operations and nighttime suspension, resulting in the inability of the pantograph to draw current normally. In severe cases, it may even cause damage or breakage of the pantograph, which will affect the safe and punctual operation of the train. The traction transformer is an electric energy conversion device in the traction power supply system that converts the external power supply voltage provided by the power system into the voltage required by the electric locomotive. The electric locomotive is powered by a single-phase AC power supply, so the traction transformer is generally a two-phase dedicated transformer, and the DC ice melting device generally requires a three-phase power supply. Therefore, its application in the railway system is limited, resulting in low ice melting efficiency of the railway electrified contact network, affecting the normal operation of the railway. Summary of the invention
[0003] The object of the present invention is to provide a two-phase to three-phase transformer, aiming to solve the problem that it is difficult to use a DC ice melting device in a railway system, resulting in reduced safety.
[0004] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: to provide a two-phase to three-phase transformer, including a box, an iron core, a left coil group and a right coil group, the iron core is arranged inside the box, the iron core is a three-column iron core, the iron core includes a left iron core column, a middle iron core column, a right iron core column, an upper iron core column and a lower iron core column, the left iron core column, the middle iron core column, and the right iron core column are arranged in sequence from left to right, the upper iron core column is mounted on the upper ends of the left iron core column and the right iron core column, the lower iron core column is mounted on the lower ends of the left iron core column and the right iron core column, the left coil group is sleeved on the outside of the left iron core column, the left coil group includes a left primary coil group and a left secondary coil group, the right coil group is sleeved on the outside of the right iron core column, and the right coil group includes a right primary coil group and a right secondary coil group.
[0005] In a possible implementation, the coil size and number of turns of the left coil group and the right coil group at the same position of the left iron core column and the right iron core column are the same.
[0006] In one possible implementation, the left secondary coil group includes a first group of left secondary coils and a second group of left secondary coils, the left primary side coil group is arranged on the outside of the first group of left secondary coils, the left primary side coil group is arranged on the inside / outside of the second group of left secondary coils, and the right secondary coil group includes a first group of right secondary coils and a second group of right secondary coils.
[0007] In one possible implementation, the left primary coil group constitutes the A phase of the primary side, the right primary coil group constitutes the C phase of the primary side, the first group of left secondary coils constitutes the a phase of the secondary side, the second group of left secondary coils and the second group of right secondary coils are connected in reverse series to constitute the b phase of the secondary side, and the first group of right secondary coils constitutes the c phase of the secondary side.
[0008] In a possible implementation, phase a, phase b, and phase c of the secondary side are connected to form a d connection through a connecting line.
[0009] In a possible implementation, phase a, phase b, and phase c of the secondary side are connected in a y-connection through connecting wires.
[0010] In a possible implementation, the first group of left secondary coils is sleeved on the outside of the left core column, the left primary coil group is arranged on the outside of the second group of left secondary coils, and the second group of left secondary coils is arranged on the outside of the left primary coil group.
[0011] In a possible implementation, the first group of left secondary coils and the second group of left secondary coils are both sleeved on the outside of the left core column, the first group of left secondary coils is arranged above the second group of left secondary coils, and the left primary side coil group is sleeved on the outside of the first group of left secondary coils and the second group of left secondary coils.
[0012] In one possible implementation, the left primary coil group includes a first group of left primary coils and a second group of left primary coils, the first group of left primary coils is sleeved on the outside of the first group of left secondary coils, the second group of left primary coils is sleeved on the outside of the second group of left secondary coils, and the first group of left primary coils is connected in parallel with the second group of left primary coils.
[0013] In a possible implementation, the cross-sectional areas of the left core leg, the middle core leg, and the right core leg are consistent.
[0014] The beneficial effects of a two-phase to three-phase transformer provided by the present invention are: Compared with the prior art, a box body, an iron core, a left coil group and a right coil group are provided, the iron core, the left coil group and the right coil group are arranged in the box body, the iron core is a three-column iron core, including a left iron core column, a middle iron core column, a right iron core column, an upper iron core column and a lower iron core column, the left coil group is wound on the outside of the left iron core column, the right coil group is wound on the outside of the right iron core column, the left coil group includes a left primary coil group and a left secondary coil group, the right coil group includes a right primary coil group and a right secondary coil group, which are connected by a connecting line, the left primary coil group and the right primary coil group each constitute one phase of the primary side, that is, the primary side is two-phase, the left secondary coil group cooperates with the right secondary coil group to constitute the three phases of the secondary side, realize the conversion between two-phase and three-phase, expand the application scope of power equipment using three-phase power supply, convert the two-phase of the traction transformer of the railway system into three-phase, facilitate the use of DC ice melting device in the railway system, improve the deicing efficiency of the railway system, and improve the safety of the operation of the railway system. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0016] Figure 1 A wiring diagram of a two-phase to three-phase transformer provided in an embodiment of the present invention in which the secondary side is connected in D connection; Figure 2 A vector diagram showing that the secondary side of a two-phase to three-phase transformer provided by an embodiment of the present invention is connected in a D-connected manner; Figure 3 A wiring diagram showing that the secondary side of a two-phase to three-phase transformer provided in an embodiment of the present invention is connected in a Y connection; Figure 4 A vector diagram showing that the secondary side of a two-phase to three-phase transformer provided by an embodiment of the present invention is connected in a Y-connection; Figure 5 Schematic diagram of the internal structure of a two-phase to three-phase transformer provided in an embodiment of the present invention Figure 1 ; Figure 6 Schematic diagram of the internal structure of a two-phase to three-phase transformer provided in an embodiment of the present invention Figure 2 .
[0017] In the figure: 1. left iron core column; 2. middle iron core column; 3. right iron core column; 4. upper iron core column; 5. lower iron core column; 6. left primary coil group; 7. first group of left primary coils; 8. second group of left primary coils; 9. first group of left secondary coils; 10. second group of left secondary coils; 11. right primary coil group; 12. first group of right primary coils; 13. second group of right primary coils; 14. first group of right secondary coils; 15. second group of right secondary coils. DETAILED DESCRIPTION
[0018] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.
[0019] Please refer to Figures 1 to 6 A specific implementation of a two-phase-to-three-phase transformer provided by the present invention is now described, including a box body, an iron core, a left coil group and a right coil group. The iron core is arranged inside the box body, and the iron core is a three-column iron core, and the iron core includes a left iron core column 1, a middle iron core column 2, a right iron core column 3, an upper iron core column 4 and a lower iron core column 5. The left iron core column 1, the middle iron core column 2, and the right iron core column 3 are arranged in sequence from left to right, the upper iron core column 4 is mounted on the upper ends of the left iron core column 1 and the right iron core column 3, the lower iron core column 5 is mounted on the lower ends of the left iron core column 1 and the right iron core column 3, the left coil group is sleeved on the outside of the left iron core column 1, the left coil group includes a left primary coil group 6 and a left secondary coil group, the right coil group is sleeved on the outside of the right iron core column 3, and the right coil group includes a right primary coil group 11 and a right secondary coil group.
[0020] A two-phase to three-phase transformer provided by the present invention is provided with a box, an iron core, a left coil group and a right coil group, the iron core, the left coil group and the right coil group are arranged in the box, the iron core is a three-column iron core, including a left iron core column 1, a middle iron core column 2, a right iron core column 3, an upper iron core column 4 and a lower iron core column 5, the left coil group is wound on the outside of the left iron core column 1, the right coil group is wound on the outside of the right iron core column 3, the left coil group includes a left primary coil group 6 and a left secondary coil group, and the right coil group includes a right primary coil group 11 and the right secondary coil group are connected by connecting wires, the left primary coil group 6 and the right primary coil group 11 respectively constitute one phase of the primary side, that is, the primary side is two-phase, and the left secondary coil group and the right secondary coil group cooperate to constitute the three-phase of the secondary side, realizing the conversion between two-phase and three-phase, expanding the application scope of power equipment using three-phase power supply, converting the two-phase of the traction transformer of the railway system into three-phase, facilitating the use of DC ice melting device in the railway system, improving the de-icing efficiency of the railway system, and improving the safety of the operation of the railway system.
[0021] For details, please refer to Figures 1 to 6 , including a box body, an iron core, a left coil group and a right coil group, an installation space is provided inside the box body, the iron core, the left coil group and the right coil group are arranged in the installation space, the iron core is a three-column iron core, the iron core includes a left iron core column 1, a middle iron core column 2, a right iron core column 3, an upper iron core column 4 and a lower iron core column 5, the upper iron core column 4 and the lower iron core column 5 are arranged relatively, the upper iron core column 4 is arranged above the lower iron core column 5, the left iron core column 1, the middle iron core column 2, and the right iron core column 3 are arranged between the upper iron core column 4 and the lower iron core column 5 from left to right, the left coil group is set on the outside of the left iron core column 1, the right coil group is set on the outside of the right iron core column 3, and the left coil group includes The left primary coil group 6 and the left secondary coil group, the right coil group includes the right primary coil group 11 and the right secondary coil group, the left primary coil group 6 and the right primary coil group 11 constitute the primary side of the transformer, the primary side of the transformer is two-phase, the left secondary coil group and the right secondary coil group constitute the secondary side of the transformer, the secondary side of the transformer is three-phase, realizing the conversion of two-phase electricity with a phase difference of 120° into balanced three-phase electricity, and can convert the two-phase of the traction transformer of the railway system into three-phase, and convert it into direct current after rectification, which is used to power the DC ice melting device, improve the de-icing efficiency of the railway system, and improve the safety of the operation of the railway system.
[0022] As a specific implementation of a two-phase to three-phase transformer provided by the present invention, please refer to Figures 1 to 6 The coil size and number of turns of the left coil group and the right coil group at the same position of the left iron core column 1 and the right iron core column 3 are the same.
[0023] For details, please refer to Figures 1 to 6 , the coil structure of the left coil group is consistent with that of the right coil group.
[0024] As a specific implementation of a two-phase to three-phase transformer provided by the present invention, please refer to Figure 5 , Figure 6 The left secondary coil group includes a first group of left secondary coils 9 and a second group of left secondary coils 10, the left primary coil group 6 is arranged on the outside of the first group of left secondary coils 9, the left primary coil group 6 is arranged on the inside / outside of the second group of left secondary coils 10, and the right secondary coil group includes a first group of right secondary coils 14 and a second group of right secondary coils 15.
[0025] For details, please refer to Figure 5 , Figure 6The left secondary coil group includes a first group of left secondary coils 9 and a second group of left secondary coils 10, the first group of left secondary coils 9 is sleeved on the outside of the left core column 1, the left primary coil group 6 is sleeved on the outside of the first group of left secondary coils 9, the second group of left secondary coils 10 can be sleeved on the outside of the left primary coil group 6, or the second group of left secondary coils 10 is arranged on the inside of the left primary coil group 6, the right secondary coil group includes a first group of right secondary coils 14 and a second group of right secondary coils 15, the first group of right secondary coils 14 is sleeved on the outside of the right core column 3, the right primary coil group 11 is sleeved on the outside of the first group of right secondary coils 14, the second group of right secondary coils 15 can be sleeved on the outside of the right primary coil group 11, or the second group of right secondary coils 15 is arranged on the inside of the right primary coil group 11, and two different coil structures can be used to realize the conversion of two phases into three phases.
[0026] As a specific implementation of a two-phase to three-phase transformer provided by the present invention, please refer to Figures 1 to 6 The left primary coil group 6 constitutes the primary side phase A, the right primary coil group 11 constitutes the primary side phase C, the first group of left secondary coils 9 constitutes the secondary side phase a, the second group of left secondary coils 10 and the second group of right secondary coils 15 are connected in reverse series to constitute the secondary side phase b, and the first group of right secondary coils 14 constitutes the secondary side phase c.
[0027] For details, please refer to Figures 1 to 6 The lead wires from the head end of the left primary coil group 6 constitute the A phase of the primary side, the lead wires from the head end of the right primary coil group 11 constitute the C phase of the primary side, the tail end of the left primary coil group 6 is connected to the tail end of the right primary coil group 11 through a connecting wire, the lead wires of the first group of left secondary coils 9 constitute the a phase of the secondary side, the lead wires of the second group of left secondary coils 10 and the second group of right secondary coils 15 are connected in series in reverse order to constitute the b phase of the secondary side, and the lead wires of the first group of right secondary coils 14 constitute the c phase of the secondary side, thereby realizing the conversion of two phases into three phases.
[0028] As a specific implementation of a two-phase to three-phase transformer provided by the present invention, please refer to Figure 1 , Figure 2 , the a, b and c phases on the secondary side are connected into d connection through connecting wires.
[0029] For details, please refer to Figure 1 , Figure 2 The a, b, and c phases on the secondary side are connected by connecting wires, and the d connection method is adopted.
[0030] As a specific implementation of a two-phase to three-phase transformer provided by the present invention, please refer to Figure 3 , Figure 4 The a, b, and c phases on the secondary side are connected in a y connection through connecting wires.
[0031] For details, please refer to Figure 3 , Figure 4 The a, b, and c phases on the secondary side are connected by connecting wires, and the Y connection method is adopted.
[0032] As a specific implementation of a two-phase to three-phase transformer provided by the present invention, please refer to Figure 5 The first group of left secondary coils 9 is sleeved on the outside of the left core column 1, the left primary coil group 6 is arranged on the outside of the second group of left secondary coils 10, and the second group of left secondary coils 10 is arranged on the outside of the left primary coil group 6.
[0033] For details, please refer to Figure 5 The first group of left secondary coils 9, the left primary coil group 6, and the second group of left secondary coils 10 are arranged on the outside of the left core column 1 from the inside to the outside, and the first group of right secondary coils 14, the right primary coil group 11, and the second group of right secondary coils 15 are arranged on the outside of the right core column 3 from the inside to the outside.
[0034] As a specific implementation of a two-phase to three-phase transformer provided by the present invention, please refer to Figure 6 The first group of left secondary coils 9 and the second group of left secondary coils 10 are both sleeved on the outside of the left core column 1, the first group of left secondary coils 9 are arranged above the second group of left secondary coils 10, and the left primary side coil group 6 is sleeved on the outside of the first group of left secondary coils 9 and the second group of left secondary coils 10.
[0035] For details, please refer to Figure 6 The first group of left secondary coils 9 is sleeved on the outside of the upper half of the left core column 1, the second group of left secondary coils 10 is sleeved on the outside of the lower half of the left core column 1, and the left primary coil group 6 is sleeved on the outside of the first group of left secondary coils 9 and the second group of left secondary coils 10; the first group of right secondary coils 14 is sleeved on the outside of the upper half of the right core column 3, the second group of right secondary coils 15 is sleeved on the outside of the lower half of the right core column 3, and the right primary coil group 11 is sleeved on the outside of the first group of right secondary coils 14 and the second group of right secondary coils 15.
[0036] As a specific implementation of a two-phase to three-phase transformer provided by the present invention, please refer to Figure 6 The left primary coil group 6 includes a first group of left primary coils 7 and a second group of left primary coils 8. The first group of left primary coils 7 is sleeved on the outside of the first group of left secondary coils 9, and the second group of left primary coils 8 is sleeved on the outside of the second group of left secondary coils 10. The first group of left primary coils 7 and the second group of left primary coils 8 are connected in parallel.
[0037] For details, please refer to Figure 6The left primary coil group 6 is a two-way coil, including a first group of left primary coils 7 and a second group of left primary coils 8. The first group of left primary coils 7 are wound on the outside of the first group of left secondary coils 9, and the second group of left primary coils 8 are wound on the outside of the second group of left secondary coils 10. The first group of left primary coils 7 and the second group of left primary coils 8 are connected in parallel; the right primary coil group 11 is a two-way coil, including a first group of right primary coils 12 and a second group of right primary coils 13. The first group of right primary coils 12 are wound on the outside of the first group of right secondary coils 14, and the second group of right primary coils 13 are wound on the outside of the second group of right secondary coils 15. The first group of right primary coils 12 and the second group of right primary coils 13 are connected in parallel.
[0038] As a specific implementation of a two-phase to three-phase transformer provided by the present invention, please refer to Figure 5 , Figure 6 The cross-sectional areas of the left core column 1, the middle core column 2, and the right core column 3 are consistent.
[0039] For details, please refer to Figure 5 , Figure 6 The cross-sections of the left core column 1, the middle core column 2, and the right core column 3 at the same height have the same shape and the same cross-sectional area.
[0040] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. A two-phase to three-phase transformer, characterized in that: It includes a box body, an iron core, a left coil group and a right coil group. The iron core is arranged inside the box body. The iron core is a three-column iron core. The iron core includes a left iron core column, a middle iron core column, a right iron core column, an upper iron core column and a lower iron core column. The left iron core column, the middle iron core column and the right iron core column are arranged in sequence from left to right. The upper iron core column is mounted on the upper ends of the left iron core column and the right iron core column, and the lower iron core column is mounted on the lower ends of the left iron core column and the right iron core column. The left coil group is sleeved on the outside of the left iron core column, and the left coil group includes a left primary coil group and a left secondary coil group. The right coil group is sleeved on the outside of the right iron core column, and the right coil group includes a right primary coil group and a right secondary coil group.
2. A two-phase to three-phase transformer as claimed in claim 1, characterized in that: The coil sizes and the number of turns of the left coil group and the right coil group at the same positions of the left iron core column and the right iron core column are the same.
3. A two-phase to three-phase transformer as claimed in claim 2, characterized in that: The left secondary coil group includes a first group of left secondary coils and a second group of left secondary coils, the left primary side coil group is arranged on the outside of the first group of left secondary coils, the left primary side coil group is arranged on the inside / outside of the second group of left secondary coils, and the right secondary coil group includes a first group of right secondary coils and a second group of right secondary coils.
4. A two-phase to three-phase transformer as claimed in claim 3, characterized in that: The first group of left secondary coils constitutes phase a of the secondary side, the second group of left secondary coils and the second group of right secondary coils are connected in reverse series to constitute phase b of the secondary side, and the first group of right secondary coils constitutes phase c of the secondary side.
5. A two-phase to three-phase transformer as claimed in claim 4, characterized in that: Phase a, phase b, and phase c on the secondary side are connected to form a d connection through connecting wires.
6. A two-phase to three-phase transformer as claimed in claim 4, characterized in that: Phase a, phase b, and phase c on the secondary side are connected in a y connection through connecting wires.
7. A two-phase to three-phase transformer as claimed in claim 3, characterized in that: The first group of left secondary coils is sleeved on the outside of the left core column, the left primary coil group is arranged on the outside of the second group of left secondary coils, and the second group of left secondary coils is arranged on the outside of the left primary coil group.
8. A two-phase to three-phase transformer as claimed in claim 3, characterized in that: The first group of left secondary coils and the second group of left secondary coils are both sleeved on the outside of the left core column, the first group of left secondary coils is arranged above the second group of left secondary coils, and the left primary side coil group is sleeved on the outside of the first group of left secondary coils and the second group of left secondary coils.
9. A two-phase to three-phase transformer as claimed in claim 8, characterized in that: The left primary coil group includes a first group of left primary coils and a second group of left primary coils. The first group of left primary coils is sleeved on the outside of the first group of left secondary coils, and the second group of left primary coils is sleeved on the outside of the second group of left secondary coils. The first group of left primary coils is connected in parallel with the second group of left primary coils.
10. A two-phase to three-phase transformer as claimed in claim 1, characterized in that: The cross-sectional areas of the left core column, the middle core column, and the right core column are consistent.