EP3809429A1 - Structure de transformateur et transformateur de traction de locomotive - Google Patents

Structure de transformateur et transformateur de traction de locomotive Download PDF

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Publication number
EP3809429A1
EP3809429A1 EP19801188.4A EP19801188A EP3809429A1 EP 3809429 A1 EP3809429 A1 EP 3809429A1 EP 19801188 A EP19801188 A EP 19801188A EP 3809429 A1 EP3809429 A1 EP 3809429A1
Authority
EP
European Patent Office
Prior art keywords
side yoke
cross
sectional area
transformer
transformer structure
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.)
Granted
Application number
EP19801188.4A
Other languages
German (de)
English (en)
Other versions
EP3809429B1 (fr
EP3809429A4 (fr
Inventor
Jinping Zhang
Wenbin Gu
Longteng WU
Xunbo GU
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bombardier NUG Propulsion System Co Ltd
Original Assignee
Bombardier NUG Propulsion System Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Bombardier NUG Propulsion System Co Ltd filed Critical Bombardier NUG Propulsion System Co Ltd
Publication of EP3809429A1 publication Critical patent/EP3809429A1/fr
Publication of EP3809429A4 publication Critical patent/EP3809429A4/fr
Application granted granted Critical
Publication of EP3809429B1 publication Critical patent/EP3809429B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • H01F27/24—Magnetic cores
    • H01F27/245—Magnetic cores made from sheets, e.g. grain-oriented
    • 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
    • H01F27/38—Auxiliary core members; Auxiliary coils or windings
    • 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
    • H01F30/10—Single-phase transformers
    • 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
    • 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
    • H01F27/24—Magnetic cores
    • H01F27/26—Fastening parts of the core together; Fastening or mounting the core on casing or support
    • H01F27/263—Fastening parts of the core together

Definitions

  • the present disclosure relates to the technical field of transformers, and in particular to a transformer structure and a traction transformer for a locomotive.
  • the traction transformer is an important component of a traction system of a rail transit locomotive, which is used for converting the 25kV high voltage obtained on an overhead line system into a voltage suitable for being supplied for operation of a traction motor and other motors and electrical appliances.
  • An object of the present disclosure is to provide a transformer structure, which can at least effectively alleviate one of the technical problems that the space for the transformer structure in the prior art is greatly limited and the transformer cannot be placed.
  • Another object of the present disclosure is to provide a traction transformer for a locomotive, which comprises the transformer structure described above and which has all the characteristics of the transformer structure.
  • the side yokes comprise a first side yoke, a second side yoke, a third side yoke, and a fourth side yoke; the first side yoke, the second side yoke, the third side yoke, and the fourth side yoke are sequentially connected in an end-to-end manner, and any two adjacent ones of the first side yoke, the second side yoke, the third side yoke, and the fourth side yoke are disposed perpendicular to each other, such that the accommodating region defined by the first side yoke, the second side yoke, the third side yoke, and the fourth side yoke is in a rectangular shape.
  • the core limb has a circular cross-sectional shape
  • each of the first side yoke, the second side yoke, the third side yoke, and the fourth side yoke has a rectangular cross-sectional shape
  • a cross-sectional area of the first side yoke is not equal to a cross-sectional area of the third side yoke.
  • a cross-sectional area of the second side yoke is not equal to a cross-sectional area of the fourth side yoke.
  • a sum of the cross-sectional area of the first side yoke and the cross-sectional area of the third side yoke is greater than or equal to the cross-sectional area of the core limb.
  • a sum of the cross-sectional area of the second side yoke and the cross-sectional area of the fourth side yoke is greater than or equal to the cross-sectional area of the core limb.
  • the cross-sectional area of the first side yoke or the third side yoke is greater than or equal to a quarter of the cross-sectional area of the core limb.
  • the cross-sectional area of the second side yoke or the fourth side yoke is greater than or equal to a quarter of the cross-sectional area of the core limb.
  • an outer corner at a position where any two of the first side yoke, the second side yoke, the third side yoke, and the fourth side yoke are connected is provided as a chamfer.
  • the first side yoke is detachably connected to the second side yoke and the fourth side yoke.
  • the coil comprises a traction winding layer, a high-voltage winding layer, and an auxiliary winding layer; and the auxiliary winding layer is sleeved over the high-voltage winding layer, and in turn the high-voltage winding layer is sleeved over the traction winding layer, with the auxiliary winding layer is located at the outermost layer.
  • a thickness of the auxiliary winding layer is less than a thickness of the traction winding layer; and/or the thickness of the auxiliary winding layer is less than a thickness of the high-voltage winding layer.
  • two coils are provided, and the two coils are sequentially sleeved outside the core limb along a length direction of the core limb.
  • the transformer structure further comprises an insulating ring piece, wherein the insulating ring piece is sleeved outside the core limb, and the insulating ring piece is located between the two coils and configured to separate the two coils.
  • a traction transformer for a locomotive can also be provided.
  • the present disclosure includes, for example, the following advantageous effects: since a transformer having a transformer structure needs to be placed in an oil tank, when the sum of the cross-sectional areas of the side yokes on any two sides of the core limb is greater than or equal to the cross-sectional area of the core limb, the transformer can be designed with different schemes according to different locomotives, the shape and area of the transformer structure can be adjusted for spatial limitations of different locomotives, and the cross-sectional areas of different side yokes are set by using the cross-sectional area of the core limb as a reference, so that it is easier to match a suitable oil tank, it can be better adapted to a vehicle body structure with great spatial limitation, and the technical problem can be effectively alleviated that the space for the transformer structure in the prior art is greatly limited so that the transformer cannot be placed, and therefore the transformer structure of the present disclosure is more suitable for popularization and use.
  • Reference Numerals 100-core; 101-side yoke; 111-first side yoke; 121-second side yoke; 131-third side yoke; 141-fourth side yoke; 102-core limb; 200-coil; 201-traction winding layer; 202-high-voltage winding layer; 203-auxiliary winding layer; 300-accommodating region; 400-chamfer; 500-insulating ring piece.
  • orientation or positional relationships indicated by the terms such as “inside” and “outside” are the orientation or positional relationships shown based on the drawings, or the orientation or positional relationships in which the inventive product is conventionally placed in use, and these terms are intended only to facilitate the description of the present disclosure and simplify the description, but not intended to indicate or imply that the referred devices or elements must be in a particular orientation or constructed or operated in the particular orientation, and therefore should not be construed as limiting the present disclosure.
  • terms such as “first” and “second” are used for distinguishing the description only, and should not be understood as an indication or implication of relative importance.
  • connection may be fixed connection or detachable connection or integral connection, may be mechanical connection or electric connection, or may be direct linking or indirect linking via an intermediate medium or internal communication between two elements.
  • connection may be fixed connection or detachable connection or integral connection, may be mechanical connection or electric connection, or may be direct linking or indirect linking via an intermediate medium or internal communication between two elements.
  • the transformer structure of the traction transformer in the prior art generally requires two core limbs 102, so that the transformer structure has a relatively large volume, and the space for the transformer will be greatly limited for some locomotive models, thus it will be impossible to place the prior art transformer; and due to the limited characteristics of the transformer structure, the above-mentioned transformer structure can only be applicable to a particular locomotive and is inconveniently popularized. Therefore, the present disclosure provides a transformer structure in response to the technical problems mentioned above.
  • a transformer structure comprises: a core 100 and coils 200; the core 100 comprises side yokes 101 and a core limb 102, the side yokes 101 form an accommodating region 300 configured to close a magnetic circuit, the core limb 102 is disposed in the accommodating region 300, and the coil 200 is sleeved outside the core limb 102 so that the coil 200 is located in the accommodating region 300; and a sum of cross-sectional areas of the side yokes 101 on any two sides of the core limb 102 is greater than or equal to a cross-sectional area of the core limb 102.
  • the core 100 has a structure being in a shape of Chinese character " " (a structure shaped like two connected rectangles), a core limb 102 is disposed, and the core limb 102 is fixed in the accommodating region 300 of the side yokes 101, wherein the side yokes 101 are formed by superimposing a plurality of iron pieces in an overlapping manner and the side yokes are mainly used for closing the magnetic circuit, and then the coil 200 is sleeved outside the core limb 102.
  • the shape and the cross-sectional area of the side yokes 101 are limited in the present disclosure, and the magnitude of the cross-sectional area of the side yokes 101 is determined under limitations from the specification of a particular locomotive in such a manner that a sum of the cross-sectional areas of the side yokes 101 on any two sides of the core limb 102 is greater than or equal to the cross-sectional area of the core limb 102, in other words, the core limb 102 is used as a reference for the design of the entire structure, therefore the shape of the core 100 can be adjusted for the locomotive so as to be capable of more easily matching a "suitable oil tank" and meeting the spatial requirements for the oil tanks of most of the locomotives.
  • the present disclosure includes, for example, the following advantageous effects: since a transformer having a transformer structure needs to be placed in an oil tank, when the sum of the cross-sectional areas of the side yokes 101 on any two sides of the core limb 102 is greater than or equal to the cross-sectional area of the core limb 102, the transformer can be designed with different schemes according to different locomotives, the shape and area of the transformer structure can be adjusted for spatial limitations of different locomotives, and the cross-sectional areas of different side yokes 101 are set by using the cross-sectional area of the core limb 102 as a reference, so that it is easier to match a suitable oil tank, it can be better adapted to a vehicle body structure with great spatial limitation, and the technical problem can be effectively alleviated that the space for the transformer structure in the prior art is greatly limited so that the transformer cannot be placed, and therefore the transformer structure of the present disclosure is more suitable for popularization and use.
  • the side yokes 101 comprise a first side yoke 111, a second side yoke 121, a third side yoke 131, and a fourth side yoke 141; the first side yoke 111, the second side yoke 121, the third side yoke 131, and the fourth side yoke 141 are sequentially connected in an end-to-end manner, and any two adjacent ones of the first side yoke 111, the second side yoke 121, the third side yoke 131, and the fourth side yoke 141 are disposed perpendicular to each other, such that the accommodating region 300 defined by the first side yoke 111, the second side yoke 121, the third side yoke 131, and the fourth side yoke 141 is in a rectangular shape.
  • the accommodating region 300 formed by the first side yoke 111, the second side yoke 121, the third side yoke 131, and the fourth side yoke 141 has a rectangular shape such that the first side yoke 111 is disposed perpendicular to the second side yoke 121, the second side yoke 121 is disposed perpendicular to the third side yoke 131, the third side yoke 131 is disposed perpendicular to the fourth side yoke 141, and the fourth side yoke 141 is disposed perpendicular to the first side yoke 111 to form a rectangular structure of the core 100, and further, the first side yoke 111 and the third side yoke 131 are located on two opposite sides, and the first side yoke 111 and the third side yoke 131 are disposed in parallel, and the second side yoke 121 and the fourth side yoke 141 are also disposed in parallel.
  • the core limb 102 has a circular cross-sectional shape
  • each of the first side yoke 111, the second side yoke 121, the third side yoke 131, and the fourth side yoke 141 has a rectangular cross-sectional shape.
  • the present disclosure is directed mainly to a transformer structure of a traction transformer for a locomotive, thus the cross-sectional shapes of the core limb 102 and the first side yoke 111, the second side yoke 121, the third side yoke 131, and the fourth side yoke 141 are provided in a preferred mode, and a structural form with a cross-sectional shape in any other conventional technical means that can achieve a closed magnetic circuit is an alternative to the present disclosure.
  • the cross-sectional area of the first side yoke 111 is not equal to the cross-sectional area of the third side yoke 131; and the cross-sectional area of the second side yoke 121 is not equal to the cross-sectional area of the fourth side yoke 141.
  • the cross-sectional area of the first side yoke 111 may be set as Y1, and the cross-sectional area of the third side yoke 131 may be set as Y2; the cross-sectional area of the second side yoke 121 may be set as S1, and the cross-sectional area of the fourth side yoke 141 may be set as S2, wherein it should be noted that it is defined in the present disclosure that Y1 is not equal to Y2 and S1 is not equal to S2, but Y1 and S1 or S2 may be the same or different, which is not limited herein.
  • a sum of the cross-sectional area of the first side yoke 111 and the cross-sectional area of the third side yoke 131 is greater than or equal to the cross-sectional area of the core limb 102.
  • a sum of the cross-sectional area of the second side yoke 121 and the cross-sectional area of the fourth side yoke 141 is greater than or equal to the cross-sectional area of the core limb 102.
  • the cross-sectional area of the core limb 102 is set as C, and the core limb 102 and the first side yoke 111, the second side yoke 121, the third side yoke 131, and the fourth side yoke 141 have such a numerical relationship that it should be ensured that Y1 ⁇ Y2, S1 ⁇ S2, and Y1+Y2 ⁇ C, S1+S2 ⁇ C.
  • the cross-sectional dimensions of Y1, Y2, S1, and S2 can be adjusted, so that it is easier to match a "suitable oil tank".
  • the above design can meet the requirements of the magnetic circuit of the transformer.
  • a magnetic field is generated after the coil 200 is energized, and magnetic lines form a magnetic circuit through the structure of the core 100, so that the strength of the magnetic field of the whole magnetic circuit is maximized to avoid magnetic leakage loss so as to fulfil the requirement of converting the 25kV high voltage obtained on an overhead line system into a voltage suitable for being supplied for operation of a traction motor and other motors and electrical appliances.
  • the cross-sectional area of the first side yoke 111 or the third side yoke 131 is greater than or equal to a quarter of the cross-sectional area of the core limb 102.
  • the cross-sectional area of the second side yoke 121 or the fourth side yoke 141 is greater than or equal to a quarter of the cross-sectional area of the core limb 102.
  • the specific numerical values of Y1, Y2, S1, and S2 are set such that it should be ensured that Y1 ⁇ a quarter of C, Y2 ⁇ a quarter of C, S1 ⁇ a quarter of C, and S2 ⁇ a quarter of C, since the cross-sectional area C of the core limb 102 is used as a reference for the design of the transformer structure.
  • the minimum value of Y2 should also be greater than or equal to three quarters of C, and similarly, when the magnitude of Y2 is a quarter of C, the minimum value of Y1 should also be greater than or equal to three quarters of C.
  • the minimum value of S2 should also be greater than or equal to three quarters of C, and similarly, when the magnitude of S2 is a quarter of C, the minimum value of S1 should also be greater than or equal to three quarters of C.
  • an outer corner at a position where any two of the first side yoke 111, the second side yoke 121, the third side yoke 131, and the fourth side yoke 141 are connected is provided as a chamfer 400.
  • the four corners of the side yokes 101 may be chamfered to form the chamfers 400; preferably, in the case where the magnetic flux density is kept constant, the no-load loss can be reduced, and the weight of the core 100 can be reduced, so that a lightweight and more economical entire transformer structure is implemented.
  • the first side yoke 111 is detachably connected to the second side yoke 121 and the fourth side yoke 141.
  • the first side yoke is used as an openable end, so that when it is necessary to wind the coil 200, the first side yoke may be firstly pulled up, and the coil 200 and an insulating ring piece 500 described later are wrapped around the core limb 102, and then the first side yoke may be connected to the second side yoke 121 and the fourth side yoke 141 by a clamping device.
  • the clamping device acts as a device for connection and fixation in the prior transformer, and therefore will not be described in detail here.
  • the coil 200 comprises a traction winding layer 201, a high-voltage winding layer 202, and an auxiliary winding layer 203; the auxiliary winding layer 203 is sleeved over the high-voltage winding layer 202, and in turn the high-voltage winding layer 202 is sleeved over the traction winding layer 201, with the auxiliary winding layer 203 is located at the outermost layer.
  • the thickness of the auxiliary winding layer 203 is less than the thickness of the traction winding layer 201; and/or the thickness of the auxiliary winding layer 203 is less than the thickness of the high-voltage winding layer 202.
  • the coil 200 of the embodiment of the present disclosure is arranged in a "traction-high-voltage-auxiliary" manner, and the auxiliary winding layer 203 is placed outside the high-voltage winding layer 202 so that the auxiliary winding layer 203 can be prevented from being affected by a high frequency signal of the traction winding layer 201, and good electromagnetic compatibility is ensured.
  • the auxiliary winding layer 203 is placed on the outermost side.
  • the auxiliary winding layer 203 Since the auxiliary winding layer 203 has a lower voltage level, the auxiliary winding layer 203 requires a smaller insulation distance from the bottom or cover of the oil tank or the like, whereby the insulation configuration can be arranged more simply, and further the volume of the transformer to the oil tank can be reduced so as to be better adapted to a vehicle body structure with great spatial limitation, and the weight of the transformer structure is reduced.
  • two coils 200 are provided, and the two coils 200 are sequentially sleeved outside the core limb 102 along the length direction of the core limb 102; further, the transformer structure according to the embodiment of the present disclosure further comprises an insulating ring piece 500; the insulating ring piece 500 is sleeved outside the core limb 102, and the insulating ring piece 500 is located between the two coils 200 and configured to separate the two coils 200.
  • the insulating ring piece 500 may be sprayed with insulating varnish for the transformer structure, and the insulating varnish may be made of an inorganic phosphate film; or an insulating ring piece 500 made of an insulating material may be used, and any insulating ring piece 500 capable of achieving the insulating function of the transformer structure may be used and will not be described in detail here.
  • a traction transformer for a locomotive can also be provided. Since the traction transformer for a locomotive is operated in a special environment of an electric locomotive, it has a series of characteristics different from an environment in which a general power transformer is operated, which will inevitably be reflected in the actual operation of the traction transformer of the electric locomotive, wherein there are relatively strict restrictions on the outer shape size and the weight, the space in the locomotive body for placement of electrical equipment is very limited, and there are high-power converter devices, high-power motors and the like inside the locomotive, and thus the traction transformer is operated in a strong electromagnetic environment.
  • the traction transformer for a locomotive further comprises an oil tank, and the oil tank is generally divided into two layers, one of which is used for placement of a main transformer and the other of which is used for installation of other electric reactor equipment.
  • the oil tank may also be equipped with auxiliary devices such as lifting lugs, valves, an oil drain plug, a pressure release valve, and a temperature measuring barrel to facilitate the operations such as lifting of the transformer and collection of an oil sample; and a magnetic isolation treatment should be performed between the upper oil tank and the lower oil tank to cut off a magnetic leakage path; and additionally, an oil protection device, a cooling system, a bushing, and transformer oil are also included; wherein the oil protection device, the cooling system, the bushing, and the transformer oil are all specific structures included in the prior art traction transformer for a locomotive and will not be described in detail here.
  • the traction transformer for a locomotive according to the embodiment of the present disclosure comprises the transformer structure according to the above embodiment, therefore the cross-sectional dimensions of Y1, Y2, S1 and S2 can be adjusted in the case where the conditions Y1 ⁇ Y2, S1 ⁇ S2, and Y1+Y2 ⁇ C and S1+S2 ⁇ C are ensured, such that it is easier to match a "suitable oil tank", and it can be better adapted to a vehicle body structure with great spatial limitation, so that the traction transformer for a locomotive according to the embodiment of the present disclosure is more suitable for popularization.
  • the transformer structure is set based on the cross-sectional area of a core limb in such a manner that the sum of the cross-sectional areas of side yokes on any two sides of the core limb is greater than or equal to the cross-sectional area of the core limb, so that the transformer structure can more easily match a suitable oil tank and can be better adapted to a vehicle body structure with great spatial limitation.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Coils Of Transformers For General Uses (AREA)
EP19801188.4A 2019-08-28 2019-08-28 Structure de transformateur et transformateur de traction de locomotive Active EP3809429B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2019/103055 WO2021035574A1 (fr) 2019-08-28 2019-08-28 Structure de transformateur et transformateur de traction de locomotive

Publications (3)

Publication Number Publication Date
EP3809429A1 true EP3809429A1 (fr) 2021-04-21
EP3809429A4 EP3809429A4 (fr) 2021-04-21
EP3809429B1 EP3809429B1 (fr) 2024-03-27

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EP19801188.4A Active EP3809429B1 (fr) 2019-08-28 2019-08-28 Structure de transformateur et transformateur de traction de locomotive

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EP (1) EP3809429B1 (fr)
WO (1) WO2021035574A1 (fr)

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB592020A (en) * 1945-03-28 1947-09-04 Harold Wilfred Hardern Improvements in and relating to magnetic core structures for transformers and like induction electric apparatus
DE754870C (de) * 1937-04-30 1953-08-03 Siemens Schuckertwerke A G Drehstromtransformator mit dreischenkeligem Eisenkern
DE961462C (de) * 1951-06-12 1957-04-04 Siemens Ag Mehrschenkliger lamellierter Eisenkern fuer Transformatoren u. dgl.
JPS5691409A (en) * 1979-12-26 1981-07-24 Hitachi Ltd Core type core for transformer
JPS5885510A (ja) * 1981-11-17 1983-05-21 Toshiba Corp 変圧器
CN2103195U (zh) * 1991-09-24 1992-04-29 廖正明 微型交流电焊机
JP2009182115A (ja) * 2008-01-30 2009-08-13 Mitsubishi Electric Corp 変圧器
WO2011148468A1 (fr) * 2010-05-26 2011-12-01 三菱電機株式会社 Transformateur
WO2012014250A1 (fr) * 2010-07-26 2012-02-02 三菱電機株式会社 Transformateur
CN104025217B (zh) * 2014-03-05 2017-05-10 深圳欣锐科技股份有限公司 一种磁芯、集成磁元件、有源钳位正反激电路及开关电源
CN203931739U (zh) * 2014-05-06 2014-11-05 深圳市铂科磁材有限公司 一种er型三相电抗器
JP6397714B2 (ja) * 2014-10-03 2018-09-26 Fdk株式会社 コイル装置
CN204946657U (zh) * 2015-08-20 2016-01-06 沈阳昊诚电气有限公司 用于变压器的铁心和具有该铁心的变压器
DE102017205746A1 (de) * 2017-04-04 2018-10-04 Siemens Aktiengesellschaft Aktivteil mit Klemmmitteln ohne Zugstangen
CN208045269U (zh) * 2018-02-08 2018-11-02 厦门昰能机电科技有限公司 一种圆轴多片叠加式变压器

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Publication number Publication date
WO2021035574A1 (fr) 2021-03-04
EP3809429B1 (fr) 2024-03-27
EP3809429A4 (fr) 2021-04-21

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