CN113808834A - Three-phase traction and electric power mixed type transformer for alternating current electrified rail transit engineering - Google Patents
Three-phase traction and electric power mixed type transformer for alternating current electrified rail transit engineering Download PDFInfo
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- CN113808834A CN113808834A CN202111053293.6A CN202111053293A CN113808834A CN 113808834 A CN113808834 A CN 113808834A CN 202111053293 A CN202111053293 A CN 202111053293A CN 113808834 A CN113808834 A CN 113808834A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F30/00—Fixed transformers not covered by group H01F19/00
- H01F30/04—Fixed transformers not covered by group H01F19/00 having two or more secondary windings, each supplying a separate load, e.g. for radio set power supplies
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/29—Terminals; Tapping arrangements for signal inductances
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
- H01F27/306—Fastening or mounting coils or windings on core, casing or other support
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F30/00—Fixed transformers not covered by group H01F19/00
- H01F30/06—Fixed transformers not covered by group H01F19/00 characterised by the structure
- H01F30/12—Two-phase, three-phase or polyphase transformers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F38/00—Adaptations of transformers or inductances for specific applications or functions
- H01F38/16—Cascade transformers, e.g. for use with extra high tension
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Abstract
The three-phase traction and power hybrid transformer for the alternating current electrified rail transit engineering greatly reduces the setting number of large high-voltage transformers and the setting number of related supporting facilities, saves engineering cost and later maintenance workload, simplifies control equipment and protection equipment, greatly saves the required space of the equipment and related supporting facilities, and reduces engineering scale and investment. The three-winding transformer is formed by adopting a triangular winding/a single-phase winding/a V-shaped winding, the triangular winding on the high-voltage side shared by traction and electric power is connected with a three-phase alternating current power supply input by an electric power system, and the single-phase winding on the low-voltage side of the traction outputs 27.5kV single-phase power supply which is connected with a traction network to provide traction power supply for rolling stocks; the two-phase V-shaped winding at the low-voltage side of the power outputs a two-phase 35kV/20kV/10kV power supply which is connected with a medium-voltage 35kV or 20kV or 10kV power supply network of rail transit to form the power supply capacity to the power load along the line; the traction low-voltage side single-phase winding and the electric low-voltage side two-phase V-shaped winding independently meet different capacity requirements.
Description
Technical Field
The invention relates to a rail transit project, in particular to a three-phase traction and power mixed type transformer for an alternating current electrified rail transit project.
Background
At present, a single-phase alternating current 25kV power supply mode consistent with that of an electrified railway is adopted in rail traffic engineering of part of cities to supply power for rolling stock. A traction transformer is independently adopted in a substation to convert an externally input three-phase 110kV or 220kV power supply into a single-phase alternating current 25kV film to provide a traction power supply for rolling stock; meanwhile, a power transformer is independently arranged to convert an externally input three-phase 110kV or 220kV power supply into a three-phase 35kV or 20kV or 10kV power supply, so that a power supply is provided for a power load along the line.
A power supply system employing separate traction and power transformers in a substation is shown in figure 4. In an urban rail transit power supply system, because such substations have high voltage levels, large occupied areas and high requirements, planning and site selection in an urban area is difficult, and external 110kV or 220kV power supply points are difficult to obtain and have high cost, the power transformer and the traction transformer are integrated in the same substation under most conditions and share the same input power supply, but the traction and the power transformers with high voltage levels are independently arranged, so that the equipment number, the occupied areas and the engineering cost are greatly improved.
The urban rail transit has relatively low running speed, high running density and heavy load. And because the single-phase alternating current 25kV is adopted as the traction power supply, the traction power supply corresponds to the electric phase splitting problem at the traction network side, so that the implementation difficulty and the influence on the aspects of the running efficiency and the like are large, and the negative sequence problem brought to the power supply side of the power system increasingly becomes two main problems which puzzle the development of the power system. It has become a problem how to reduce the electric phase separation of the traction network as much as possible and meet the requirements of the three-phase imbalance standard of the power system.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a three-phase traction and power hybrid transformer for alternating current electrified rail transit engineering, so as to greatly reduce the setting number of large high-voltage transformers and the setting number of related supporting facilities, save engineering cost and later maintenance workload, simplify control equipment and protection equipment, greatly save the space required by the equipment and the related supporting facilities, and reduce engineering scale and investment.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the invention discloses a three-phase traction and electric power mixed type transformer for alternating current electrified rail transit engineering, which is characterized in that: a triangular winding/a single-phase winding/a V-shaped winding are adopted to form a three-winding transformer and are uniformly integrated in a transformer shell; the traction and electric power common high-voltage side triangular winding is connected with a three-phase alternating current power supply input by an electric power system, and the traction low-voltage side single-phase winding outputs a 27.5kV single-phase power supply which is connected with a traction network to provide a traction power supply for the locomotive; the two-phase V-shaped winding at the low-voltage side of the power outputs a two-phase 35kV/20kV/10kV power supply which is connected with a medium-voltage 35kV or 20kV or 10kV power supply network of rail transit to form the power supply capacity to the power load along the line; the traction low-voltage side single-phase winding and the electric low-voltage side two-phase V-shaped winding independently meet different capacity requirements.
Or, a four-winding transformer is formed by adopting single-phase winding/single-phase winding and V-shaped winding/V-shaped winding connection wires and is uniformly integrated in a transformer shell; the traction high-voltage side single-phase winding and the traction low-voltage side single-phase winding form a traction side winding; the power high-voltage side V-shaped winding and the power low-voltage side V-shaped winding form a power side winding; the traction high-voltage side single-phase winding and the electric power high-voltage side V-shaped winding are connected in an interphase mode through a high-voltage side external connection wire; the traction low-voltage side single-phase winding and the power low-voltage side V-shaped winding independently meet different capacity requirements.
The beneficial effects of the invention are mainly reflected in the following aspects:
1. the three-phase traction and power hybrid transformer shares a high-voltage side 110kV or 220kV incoming line, a traction load directly outputs single-phase power supply, the power load adopts V-shaped wiring to output power supply, and a traction and power winding adopts an equal-capacitance or unequal-capacitance structure according to actual engineering conditions, so that the head end electric phase separation of the outgoing line on the network side of a traction substation can be reduced, and conditions are provided for the traction load to adopt in-phase power supply in the whole line;
2. the high-voltage side three-phase current of the three-phase traction and power hybrid transformer is balanced on the whole, and zero sequence cannot be generated under any condition;
3. the three-phase traction and electric power hybrid transformer can effectively reduce the negative sequence injection current of the single-phase traction load of the alternating current electrified rail transit project to the electric power system through the mutual balance action of the traction load and the electric power load, and when the capacity ratio of the electric power/the traction load is more than or equal to 60 percent, the negative sequence current injected into the electric power system is superior to that of the V/V wiring traction transformer widely adopted at present;
4. the traction transformer and the power transformer in the substation are integrated, so that the setting quantity of large high-voltage transformers and the setting quantity of related supporting facilities are greatly reduced. On one hand, the sharing of facilities and materials such as an iron core, a shell, a support, an insulator, a radiator and the like is realized to the greatest extent, and the engineering cost and the later maintenance workload are saved; on the other hand, the number of large high-voltage transformers is reduced, the number of high-voltage switches and other equipment connected with the transformers is correspondingly reduced, meanwhile, the control and protection equipment is simplified, the space required by the equipment and related supporting facilities are greatly saved, the engineering scale and investment are reduced, and valuable urban land resources can be saved.
Drawings
The present specification includes the following 4 figures:
fig. 1 is a winding wiring manner of a three-phase traction and power hybrid transformer for an alternating current electrified rail transit engineering of the present invention, wherein: the transformer comprises a transformer shell 1, a high-voltage side triangular winding 11, a traction low-voltage side single-phase winding 12 and an electric low-voltage side two-phase V-shaped winding 13;
fig. 2 is another winding connection mode of the three-phase traction and power hybrid transformer for the ac power rail transit engineering of the present invention, in which: the high-voltage-side single-phase traction winding comprises a transformer shell 1, a high-voltage-side single-phase traction winding 21, a low-voltage-side single-phase traction winding 22, an electric high-voltage-side V-shaped winding 31, an electric low-voltage-side V-shaped winding 32 and a high-voltage-side external connection wire 10;
fig. 3 is a voltage-current vector diagram of the high-low voltage side of the three-phase traction and power hybrid transformer for the alternating current electrified rail transit engineering, wherein: i isQFor a traction side current, Ia、IbIs the load current on the power side, phiQPhi is the traction load angle and phi is the electrical load angle.
Fig. 4 is a schematic diagram of a power supply scheme employing separate traction and power transformers in a substation.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
The traction transformer and the power transformer which are independently arranged conventionally are integrated into a set of device, the traction transformer and the power transformer are used for a substation which is built by combining traction and power supply, a 110kV or 220kV high-voltage side power supply is shared, and a single-phase 27.5kV traction power supply and a 35kV or 20kV or 10kV three-phase power supply are output and are respectively used as power supply sources of traction power supply and power loads along the line.
The three-phase traction and power hybrid transformer uses two winding connection forms as shown in fig. 1 or fig. 2.
Referring to the first scheme, the three-phase traction and power hybrid transformer for the alternating current electrified rail transit engineering adopts a triangular winding/single-phase winding/V-shaped winding (delta/I/V) to form a three-winding transformer, and is uniformly integrated in a transformer shell 1. The traction and electric power common high-voltage side triangular winding 11 is connected with a three-phase alternating current power supply input by an electric power system, and the traction low-voltage side single-phase winding 12 outputs a 27.5kV single-phase power supply which is connected with a traction network to provide a traction power supply for a locomotive vehicle; the two-phase V-shaped winding 13 at the low-voltage side of the electric power outputs a two-phase 35kV/20kV/10kV power supply which is connected with a medium-voltage 35kV or 20kV or 10kV power supply network of the rail transit to form the power supply capacity to the electric power load along the line; the traction low-voltage side single-phase winding 12 and the electric low-voltage side two-phase V-shaped winding 13 respectively and independently meet different capacity requirements.
Scheme two referring to fig. 2, the three-phase traction and power hybrid transformer for the alternating current electrified rail transit engineering adopts a single-phase winding/single-phase winding (I/I) and a V-shaped winding/V-shaped winding (V/V) to form a four-winding transformer, and is uniformly integrated in a transformer shell 1. The traction high-voltage side single-phase winding 21 and the traction low-voltage side single-phase winding 22 form a traction side winding; the power high-voltage side V-shaped winding 31 and the power low-voltage side V-shaped winding 32 form a power side winding; the traction high-voltage side single-phase winding 21 and the electric power high-voltage side V-shaped winding 31 are connected in an interphase mode through a high-voltage side external connection wire 10; the traction low-voltage side single-phase winding 22 and the power low-voltage side V-shaped winding 32 each independently satisfy different capacity requirements.
The technical scheme can be applied to the national railway trunk lines and can also be applied to the urban rail transit engineering of the alternating current power supply system.
The principle of the three-phase traction and power hybrid transformer for the alternating current electrified rail transit engineering is shown in the figures 1 and 2. Setting the number of turns of the high-voltage side winding as WⅠThe number of low-voltage side winding turns is WⅡ、WⅢ，k1＝WⅠ/WⅡ，k2＝WⅠ/WⅢThen, according to the principle of magnetic potential balance on each core column, the current mapping relationship of the high-voltage side and the low-voltage side can be written as follows:
the voltage and current vectors of the high-low voltage side of the three-phase traction and power hybrid transformer are drawn according to the graphs of fig. 2, fig. 3 and the formula (1) as shown in fig. 3. As can be seen from fig. 3, the high-side three-phase voltages of the three-phase traction and power hybrid transformer are symmetrical, and the high-side three-phase currents are generally balanced, and no zero sequence is generated under any condition.
The negative sequence analysis of the three-phase traction and power mixed type transformer for the alternating current electrified rail transit engineering is as follows:
by the formula (1) according to the symmetrical component method
Then:
traction load angle phiQWhen cos phiQ≈1，k1＝110/27.5，k2＝110/35，I/IQWhen m is equal to m:
three-phase current unbalance:
ε＝I2/I1 (4)
then:
according to equation (5), the values of the power/traction load current asymmetry coefficient m are different:
when m is 0, epsilon is 1, which is equivalent to a single-phase traction transformer adopted by a traction substation, and the negative sequence influence on the power system is equivalent to the single-phase traction transformer;
when m is equal to 1, if cos phi is approximately equal to 0.9, and epsilon is equal to 0.1651, the negative sequence influence on the power system is close to a balance traction transformer;
when m is equal to 0.23, if cos phi is approximately equal to 0.9, and epsilon is equal to 0.5, the negative sequence influence on the power system is equivalent to a V/V connection traction transformer;
and KS＝SD/SQ＝(2UD*I)/(UD*IQ) (6)
In the formula: kSIs the ratio of the power load capacity to the traction load capacity, SDTo the power load capacity, SQFor traction load capacity, UDIs the phase voltage of the power load, I is the phase current of the power load, UQFor traction load phase voltage, IQTo draw the load phase current.
When m is 0.23, KS0.6, that is: for the negative sequence characteristics of the three-phase traction and power hybrid transformer, the negative sequence characteristics correspond to different power/traction load capacity ratios (K)S) When the power load capacity is more than or equal to 60% of traction load, the negative sequence characteristic of the corresponding three-phase traction and power hybrid transformer is equal to or better than that of the V/V connection traction transformer which is widely adopted at present (when the two traction power supply arms are loaded relatively).
In conclusion, the invention can realize the integration of the traction transformer and the power transformer in the alternating current electrified rail transit engineering substation, and realize the power supply of the traction load with the voltage class of alternating current of 25kV and the power supply of the conventional power load with the voltage class of 35kV, 20kV or 10 kV. The number of the large high-voltage transformers and the number of the related supporting facilities can be greatly reduced, the engineering cost and the later maintenance workload are saved, meanwhile, the control equipment and the protection equipment are simplified, the space required by the equipment and the related supporting facilities are greatly saved, and the engineering scale and the investment are reduced.
Claims (2)
1. Three-phase traction and electric power hybrid transformer for alternating current electrified rail transit engineering, which is characterized in that: a triangular winding/single-phase winding/V-shaped winding is adopted to form a three-winding transformer and is uniformly integrated in a transformer shell (1); the traction and electric power common high-voltage side triangular winding (11) is connected with a three-phase alternating current power supply input by an electric power system, and the traction low-voltage side single-phase winding (12) outputs a 27.5kV single-phase power supply which is connected with a traction network to provide a traction power supply for rolling stocks; the two-phase V-shaped winding (13) at the low-voltage side of the power outputs a two-phase 35kV/20kV/10kV power supply which is connected with a medium-voltage 35kV or 20kV or 10kV power supply network of the rail transit to form the power supply capacity to the power load along the line; the traction low-voltage side single-phase winding (12) and the electric low-voltage side two-phase V-shaped winding (13) independently meet different capacity requirements.
2. Three-phase traction and electric power hybrid transformer for alternating current electrified rail transit engineering, which is characterized in that: the four-winding transformer is formed by adopting single-phase winding/single-phase winding and V-shaped winding/V-shaped winding connection, and is uniformly integrated in a transformer shell (1); the traction high-voltage side single-phase winding (21) and the traction low-voltage side single-phase winding (22) form a traction side winding; the power high-voltage side V-shaped winding (31) and the power low-voltage side V-shaped winding (32) form a power side winding; the traction high-voltage side single-phase winding (21) and the electric power high-voltage side V-shaped winding (31) are connected in an interphase mode through a high-voltage side external connection wire (10); the traction low-voltage side single-phase winding (22) and the electric low-voltage side V-shaped winding (32) independently meet different capacity requirements.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116470643A (en) * | 2023-04-24 | 2023-07-21 | 北京城建设计发展集团股份有限公司 | Remote power distribution system for track traffic motor load |
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