CN201081805Y - V-V type compact power transformer for electric traction - Google Patents
V-V type compact power transformer for electric traction Download PDFInfo
- Publication number
- CN201081805Y CN201081805Y CNU2007201521904U CN200720152190U CN201081805Y CN 201081805 Y CN201081805 Y CN 201081805Y CN U2007201521904 U CNU2007201521904 U CN U2007201521904U CN 200720152190 U CN200720152190 U CN 200720152190U CN 201081805 Y CN201081805 Y CN 201081805Y
- Authority
- CN
- China
- Prior art keywords
- phase
- power transformer
- winding
- sleeve pipe
- power
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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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
- H01F30/14—Two-phase, three-phase or polyphase transformers for changing the number of phases
-
- 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
- H01F27/002—Arrangements provided on the transformer facilitating its transport
Abstract
A power transformer (100) for electric traction comprises a box body (3) and a single magnetic core (10) positioned inside the box body (3), wherein, the single magnetic core comprises a central branch circuit (11) and two collateral branch circuits (12 and 13). A first phase (20) comprises a primary side winding (22) and a secondary side winding (21) which are wound on one branch circuit; a second phase (30) comprises a primary side winding (32) and a secondary side winding (31) which are wound on the other branch circuit.
Description
Technical field
The utility model relates to the compact power transformer that is used for electric traction.More specifically, the utility model relates to V-V connecting-type compact power transformer, and it is particularly suited for electrified railroad traction system.Below will be by described with reference to these systems, but not be intended to limit by any way its possible application.
Background technology
The voltage and current conversion equipment is known, and is used for electric power is sent to load or terminal use from generator unit in power industry.
Transmit electric power with effective means and require high-voltage level, so that reduce to flow through the electric current of circuit and therefore minimize the power loss that is associated with energy delivery.Therefore, this electric power is transmitted under the high-tension situation more effective, yet because safety factor, consumption side requires for example middle-voltage network of lower voltage level.Therefore need electric machinery to convert to medium effectively high voltage power or low-voltage power, this class machine is called as transformer.
In electric traction is used, particularly in railroad traction system, need single phase alternating current (A.C.) electric power system usually, however AC transmission system three-phase always almost.
Depend on the connected mode of the winding that is associated with two related electrical voltage systems, with single-phase output voltage transformer the different choices of technology is arranged at three-phase input voltage of power.
In most of the cases, so-called V-V connected system is used in this class application in the past, and effect is fine.More specifically, it is to provide voltage source (with single-phase mode) to railway equipment that V-V is connected the purpose that transformer is used for drawing, and it takes from three-phase high-voltage power supply line.In its modular design, this class connects uses two independent and different Monophase electric power transformers, and its winding connects as follows:
The terminal of the former limit winding of each single-phase transformer is connected to the two-phase of three-phase electrical power system.Therefore, one of two windings terminal separately will be connected to public phase, and another terminal is connected to not homophase;
The secondary winding of each single-phase transformer is connected in series, and the normal ground connection of the tie point of two windings.Therefore, single phase alternating current (A.C.) voltage is arranged between the another terminal of these two secondary windings, be used for providing power supply to railway equipment.
Described V-V connects provides Monophase electric power from three-phase power network, only causes slight unbalanced in three-phase power network.One or two winding comprises that tap is also very common to adjust output voltage.At last, what be worth prompting is, because the operating condition of railway equipment, the design traction transformer will be considered more severe condition of work than common power transformer because traction transformer must stand overload strong, short-term and the winding that causes by frequent current surge on high electronic stress etc.
Although the power transformer that uses provides good scheme at present, they still have improved some shortcoming of being worth.Specifically be that a major defect of known schemes is that it uses two separate single-phase transformers, and therefore two independently electromagnetic circuits are arranged.Correspondingly, these two circuit must be included in two different stuffing boxs or single stuffing box in.In both cases, final result is a heavy scheme, particularly with regard to size and weight.This has directly caused because other shortcomings that transportation and the problem of installing and expense are brought, and because the maintenance that the device of use twice causes and the potential problems of reliability.
The utility model content
Therefore, main purpose of the present utility model provides the new power transformer that is used for electric traction, and it can overcome above-mentioned defective, and particularly, with respect to the scheme in prior art field, this transformer is more compact, reliable and cheap.
Tangible this purpose and other purpose of will becoming hereinafter realizes by a kind of power transformer that is used for electric traction, it is characterized in that comprising:
Casing;
Single magnetic core, it is positioned at described box house, and comprises three branch roads (leg), and wherein a branch road is positioned at central authorities, and two branch roads are positioned at the both sides of this central authorities' branch road;
First phase, it comprises former limit winding and secondary winding, described winding is wrapped on one of described three branch roads;
Second phase, it comprises former limit winding and secondary winding, described winding is wrapped in described three branch roads another.
In concrete preferred embodiment, the former limit winding of first phase and secondary winding are wrapped on the first side branch road, and the former limit winding of second phase and secondary winding are wrapped on the second side branch road.
Description of drawings
Further characteristics and advantage are from according to preferably more of the present utility model but be not will become obviously the description of embodiment of exclusiveness, and these embodiment utilize accompanying drawing only to illustrate by non-restrictive example, wherein:
Fig. 1 has schematically shown the layout according to the winding and the electromagnetic circuit of power transformer of the present utility model;
Fig. 2 shows the end view of the compact transformer shown in Figure 1 of the V-V connecting-type that is ready to be connected to electric power system;
Fig. 3 illustrates the power transformer of the Fig. 2 that looks from the rear section;
Fig. 4 is the top view of the power transformer of Fig. 2 and Fig. 3;
Fig. 5 has schematically shown the winding diagram that power transformer connects.
Embodiment
In the following description, same reference numerals will be used to indicate the identical or equivalent elements among the different figure.
With reference to above-cited figure, come out at Fig. 2-4 perfect representation by reference number 100 according to the power transformer that is used for electric traction of the present utility model, it comprises: casing 3, the working portion that comprises transformer, as electromagnetic circuit, winding and connection thereof, and according to requirement of client, bringing onto load or bringing onto load tap changer not.Described casing 3 also can comprise the necessary parts of phase shifting transformer, transports and raises it as wheel and sleeper beam, and be used to place it in the final position.The oil storage also is provided and preserves casing 5, it is indicated as conservator usually, is used for holding essential oil to replenish any variation of the volume that is contained in the oil in the main box 3, and its variation can be for example to be caused by variation of temperature.In Fig. 3, cooling-part 6 also has been shown, it is for remaining on oily temperature in the acceptable level and any internal power consumption of the transformer that is used to dissipate is essential.In illustrated embodiment, cooling device 6 is made up of radiator and electric fan.In Fig. 3, also illustrate not bringing onto load tap changer wheel 7 and control cubicle 8, the user of this machine can be connected to tranformer protection and control appliance from it.The bringing onto load tap changer can also be provided.
Advantageously, in according to power transformer 100 of the present utility model, electromagnetic circuit comprises single magnetic core, and it is positioned at casing 3, indicates by reference number 10 in Fig. 1.As illustrated, only one magnetic core 10 comprises three branch roads or branch 11,12,13, and wherein a branch road 11 places central authorities, and two branch roads 12,13 place the both sides of central branch road 11.Branch road 11,12,13 is connected to each other by yoke 14.First mutually 20 comprises for example high voltage winding of former limit winding 22, and secondary winding 21 presses winding in for example, and both one of are wrapped in three branch roads 11 or 12 or 13.Second mutually 30 comprises former limit winding 32, and for example high voltage winding, and secondary winding 31 is pressed winding in for example, and both are wrapped on an other branch road 11 or 12 or 13.
Define as international standard and convention, here the high-tension definition meaning is meant the voltage level that is higher than 1kV, and the definition of middle pressure normally is used to indicate such high voltage range, promptly more than the 1kV, up to 72kV or even up to the subrange of the voltage level of 100kV.
According to preferred embodiment shown in Figure 1, the former limit winding 22 and the secondary winding 21 of first phase 20 are wrapped on the first side branch road, as side branch road 12; And the former limit winding 32 and the secondary winding 31 of second phase 30 are wrapped on the second side branch road 13.Central authorities' branch road 11 constitutes the return path by the magnetic flux of side branch road 12,13 circulations.In other words, in operation, in a side branch road 12 of transformer, produce magnetic flux corresponding to voltage between phases; This flux has certain modulus and phase place.On opposite side branch road 13, also produce magnetic flux with identical modulus, this is because this branch road also is connected to voltage between phases, and supposition has the electrical voltage system of balance and has 120 phase-shifteds of spending usually.By connection and the direction of selecting winding rightly, the vector addition of two magnetic flux of the central branch road 11 of flowing through has the phase-shifted of identical modulus and 240 degree.Therefore, the magnetic flux flow of same amount is crossed three branch roads 11,12,13.In side branch road 12,13, it produces by winding, and central branch road be since they vector and.
According to the scheme that known and those skilled in the art are easy to obtain and therefore are not described in detail here, the winding 22,32,21 in lateral column 12 and 13 and 31 can be according to designing with traditional standard that single-phase transformer is associated at aspects such as insulation distance, current densities.Conceive its design and can consider the special characteristics that is associated with traction transformer, as relate to the heavily overload of severe electric power dynamic need, frequent surge etc.
As diagram better among Fig. 2, power transformer 100 comprises first group of sleeve pipe 4, and it is suitable for mode of operation first mutually 20 and second mutually 30 and power line, and the high voltage three-phase power line that promptly schematically shows by reference number 1 among Fig. 1 interconnects.In addition, transformer 100 comprises second group of sleeve pipe 40, and it is suitable for mode of operation particularly interconnecting with intermediate voltage electric power system first mutually 20 and second mutually 30 and at least one electric equipment (not shown).
First group of sleeve pipe 4 comprises: the first high voltage bushing 4C, and it is connected to the former limit winding 22 of first phase 20; The second high voltage bushing 4A, it is connected to the former limit winding 32 of second phase 30; And the 3rd high voltage bushing 4B, it is connected to first 20 former limit winding 22 and second, 30 the former limit winding 32 on both mutually mutually. High voltage 4A, 4B, 4C are connected to three-phase power line 1, and can be for example made up by the high voltage bushing of capacity type.
Correspondingly, second group of sleeve pipe 40 comprises: the first sleeve pipe 40A and the second sleeve pipe 40B, and both are connected to the secondary winding 21 of first phase for this; And the 3rd sleeve pipe 40C and quadruplet pipe 40D, both are connected to second 30 the secondary winding 31 mutually these.Be connected to first one among the sleeve pipe 40A of 20 secondary winding or the 40B mutually, be connected to ground as the first sleeve pipe 40A; Similarly, be connected to second one among the 3rd sleeve pipe 40C of 30 secondary winding 31 and the quadruplet pipe 40D mutually, be connected to ground as the 3rd sleeve pipe 40C.
This sleeve pipe 40A-40D can for example constitute by capacitive based porcelain bushing.
Like this, former limit or high voltage winding 22 and 23 connect into the V-V configuration, and secondary or middle pressure winding 21 and 31 are connected in series.Obviously, depend on and use and/or special requirement, it is also passable that many other connect configuration, especially at the secondary winding.
Fig. 5 shows the connection configuration at the different windings that form V-V connecting-type transformer.Two single-phase high voltage windings 22 in this example are provided with adjusts tap 23, presses the current transformer 24 of outlet side in can seeing, it is used for measurement and protection power devices in the transformer station that transformer is installed.
In practice, find to have the purpose of some advantages with respect to prior art according to what power transformer of the present utility model had been realized estimating fully.In fact, as mentioned above, this power transformer 100 has very compact design, and wherein all windings all are V-V and connect, and are the single electromagnetic circuit with single consubstantiality formula three post magnetic cores.Because this close-coupled configuration, the two-phase power transformer that V-V connects its weight and big or small aspect have optimal design, and represented the significant improvement (or to current installed device substitute) of the new transformer of V-V connecting-type, because it is more cheap than the existing technical scheme that can be used for such connection.Therefore, be used to make, buy required investment and to be used for the required space of position resolver all optimised.As an example of this realization, for having the 32MVA power transformer that original edge voltage is 110kV, the size of machine can be reduced to the about 6m of length, the about 5.7m of width and highly about 5.1m.Total weight also can be reduced to about 75 tons, and this can further bring the advantage on freight, because for example, the hauled weight of the heavy parts up to 120 tons is considered to be suitable for road transport, and the weight that surpasses this level needs railway transportation.
As implied above, be suitable for application in the electric traction according to power transformer of the present utility model, and especially be suitable for the electric railway electric power system.Therefore, the utility model also relates to electric power system, and especially electric railway traction electric power system comprises:
-power line, promptly the high-voltage power line 1;
Be fit to one or more electric equipments, comprise: a phase intermediate voltage electric power system for example by described power line power supply; Be characterised in that it comprises aforesaid power transformer 100, it is connected between described power line and the described one or more electric equipment with mode of operation.
Gou Si power transformer is easy to make amendment and be out of shape like this, and all such modifications and distortion all drop in the utility model concept and range; All details can further utilize the technical equivalents element to replace.For example, sleeve pipe can be made according to not isostructure, perhaps can place diverse location or carry out different electrical connections.In practice, as long as employed material itself and special purpose and size compatibility, just can be as required and any material of the state of this area.
Claims (10)
1. power transformer that is used for electric traction is characterized in that comprising:
-casing (3);
-single magnetic core (10), it is positioned at described casing (3), and comprises three branch roads (11,12,13), and wherein a branch road (11) is positioned at central authorities, and two branch roads (12,13) are positioned at the both sides of this central authorities' branch road (11);
-the first phase (20), it comprises former limit winding (22) and secondary winding (21), it is wrapped on one of described three branch roads (11,12,13);
-the second phase (30), it comprises former limit winding (32) and secondary winding (31), it is wrapped in described three branch roads (11,12,13) another.
2. power transformer according to claim 1 is characterized in that on the former limit winding (22) of described first phase (20) and first (12,13) that secondary winding (21) is wrapped in described side branch road (12,13).
3. power transformer according to claim 2 is characterized in that on the former limit winding (32) of described second phase (30) and second (13,12) that secondary winding (31) is wrapped in described side branch road (12,13).
4. according to each described power transformer of claim 1-3, it is characterized in that described central branch road (11) constitutes the return path by the magnetic flux of described side branch road (12,13) circulation.
5. according to each described power transformer of claim 1-3, it is characterized in that comprising first group of sleeve pipe (4), be used for interconnecting with power line with described second mutually described first with mode of operation.
6. according to each described power transformer of claim 1-3, it is characterized in that comprising second group of sleeve pipe (40), be used for interconnecting with at least one electric equipment with described second mutually described first with mode of operation.
7. power transformer according to claim 5 is characterized in that described first group of sleeve pipe comprises: first high voltage bushing, and it is connected to the former limit winding of described first phase; Second high voltage bushing, it is connected to the former limit winding of described second phase; And the 3rd high voltage bushing, its former limit winding that is connected to the former limit winding of described first phase and described second phase is on both.
8. power transformer according to claim 6 is characterized in that described second group of sleeve pipe comprises: first sleeve pipe and second sleeve pipe, and it is connected to the described secondary winding of described first phase;
And the 3rd sleeve pipe and quadruplet pipe, it is connected to the described secondary winding (31) of described second phase.
9. power transformer according to claim 6, one that it is characterized in that being connected in described first and second sleeve pipes of secondary winding of described first phase is connected to ground; And of being connected in described third and fourth sleeve pipe of secondary winding of described second phase is connected to ground.
10. electric power system that is used for electric traction comprises:
-power line;
-be suitable for one or more electric equipments by described power line power supply, it is characterized in that comprising power transformer according to claim 1, it is connected with mode of operation between described power line and the described one or more electric equipment.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP07100680A EP1947659A1 (en) | 2007-01-17 | 2007-01-17 | Compact power transformer in V-V for electrical traction |
| EP07100680.3 | 2007-01-17 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201081805Y true CN201081805Y (en) | 2008-07-02 |
Family
ID=38050947
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007201521904U Expired - Lifetime CN201081805Y (en) | 2007-01-17 | 2007-07-11 | V-V type compact power transformer for electric traction |
| CNA2007101305149A Pending CN101226817A (en) | 2007-01-17 | 2007-07-11 | Compact power transformer in v-v for electrical traction |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007101305149A Pending CN101226817A (en) | 2007-01-17 | 2007-07-11 | Compact power transformer in v-v for electrical traction |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP1947659A1 (en) |
| CN (2) | CN201081805Y (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108735481B (en) * | 2017-04-13 | 2022-07-19 | 株洲中车时代电气股份有限公司 | Vv coupling traction transformer |
| WO2020217109A1 (en) * | 2019-04-22 | 2020-10-29 | Abb Power Grids Switzerland Ag | Traction tranformer with a four-limb core |
| CN112397294B (en) * | 2019-08-12 | 2022-10-14 | 特变电工智能电气有限责任公司 | Iron core, winding structure and traction transformer |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB548042A (en) * | 1941-01-22 | 1942-09-23 | British Fed Welder & Machine C | Improvements in, or relating to, electric supply arrangements for electric welding machines |
| DE1488209B2 (en) * | 1964-07-31 | 1971-04-01 | Licentia Patent Verwaltungs GmbH, 6000 Frankfurt | TRANSFORMER FOR TRACTION IN PARTICULAR LOCOMOTIVE TRANSFORMER |
| FR2640076B1 (en) * | 1988-12-07 | 1991-05-10 | Pitra Lucien | THREE-PHASE TRANSFORMER / MY INTENSITY BALANCER OPHASE |
| CN2454880Y (en) * | 2000-12-19 | 2001-10-17 | 云南变压器电气股份有限公司 | V/V connected conjugate three-to-two phase transformer |
| ES2257161B1 (en) * | 2004-07-22 | 2007-07-01 | Asea Brown Boveri, S.A. | MULTI-VOLTAGE POWER TRANSFORMER FOR HIGH VOLTAGE ELECTRICAL POWER TRANSMISSION NETWORK (POLYTHRAPH). |
-
2007
- 2007-01-17 EP EP07100680A patent/EP1947659A1/en not_active Withdrawn
- 2007-07-11 CN CNU2007201521904U patent/CN201081805Y/en not_active Expired - Lifetime
- 2007-07-11 CN CNA2007101305149A patent/CN101226817A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| CN101226817A (en) | 2008-07-23 |
| EP1947659A1 (en) | 2008-07-23 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20080702 |