CN108010683A - A kind of machine car transformer - Google Patents

A kind of machine car transformer Download PDF

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Publication number
CN108010683A
CN108010683A CN201711446139.9A CN201711446139A CN108010683A CN 108010683 A CN108010683 A CN 108010683A CN 201711446139 A CN201711446139 A CN 201711446139A CN 108010683 A CN108010683 A CN 108010683A
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China
Prior art keywords
winding
iron core
core column
machine car
conducting wire
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CN201711446139.9A
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Inventor
李学生
白东浩
张尊扬
盛洪江
张新闻
师洪涛
吴国强
刘凡齐
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North Minzu University
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North Minzu University
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Priority to CN201711446139.9A priority Critical patent/CN108010683A/en
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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
    • H01F27/24—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
    • H01F27/24—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
    • 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
    • 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
    • H01F27/32—Insulating of coils, windings, or parts thereof
    • H01F27/323—Insulation between winding turns, between winding layers
    • 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
    • H01F27/32—Insulating of coils, windings, or parts thereof
    • H01F27/324—Insulation between coil and core, between different winding sections, around the coil; Other insulation structures
    • 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
    • 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
    • H01F27/346—Preventing or reducing leakage fields
    • 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
    • H01F2027/348—Preventing eddy currents

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Coils Of Transformers For General Uses (AREA)

Abstract

The present invention relates to a kind of machine car transformer, including iron core, package parts and winding, iron core forms heart type structure by iron core column and iron yoke, and the fixation and encapsulation of iron core are carried out using package parts, iron core column cross section is in polygon trapezium structure, when its approximate circular diameter is between 270 millimeters and 290 millimeters, the series of iron core column is more than 11 grades；Winding includes low pressure winding and high-voltage winding, and winding uses concentric type, and the axis direction of winding along iron core column is divided into upper and lower two layers, forms double winding quadripartion structure；Between the top of upper strata winding, two layers of winding and bottom of lower floor's winding is both provided with insulating end ring, and insulating end ring is used to insulate.Under locomotive spatial transformer and the restrictive condition of weight, the machine car transformer not only meets the technical requirements of large capacity, lightweight and high reliability, can also reduce leakage field and eddy-current loss, so that the machine car transformer has higher power density.

Description

A kind of machine car transformer
Technical field
The present invention relates to special voltage Class power transformer technical field, and in particular to a kind of machine car transformer.
Background technology
In recent years, with the continuous speed-raising of China's EMU, reliability of the railroad to high-speed EMU power-equipment Increasingly higher demands are proposed with security；Machine car transformer is most important electrical equipment in electric railway, its property The quality of energy has conclusive influence to the operation of electric railway；Machine car transformer is high-speed EMU Traction Drive system The critical component of system, in order to meet the requirement of modern electrical railway speed increase, the locomotive as electrical system critical component becomes Depressor increasingly develops to lightweight, miniaturization and high reliability direction；However, high-speed EMU traction drive uses locomotive The demand of transformer capacity is increasing, how under the limitation of EMU space and weight, reduces leakage field and eddy-current loss, The power density of raising machine car transformer is current urgent problem to be solved.
The content of the invention
It is an object of the invention to improve the deficiency in the presence of the prior art, there is provided a kind of machine car transformer, in machine Under the restrictive condition of car transformer space and weight, which not only meets large capacity, lightweight and highly reliable The technical requirements of property, can also reduce leakage field and eddy-current loss, so that machine car transformer has higher power density.
The technical solution adopted by the present invention to solve the technical problems is：
A kind of machine car transformer, including iron core, package parts and winding, the iron core form the heart by iron core column and iron yoke Formula structure, and using the fixation and encapsulation of package parts progress iron core, the iron core column and iron yoke are folded by iron core column respectively Piece and iron yoke lamination are overrided to form, and iron core column cross section is in polygon trapezium structure, its approximate circular diameter is between 270 millimeters and 290 When between millimeter, the series of iron core column is more than 11 grades；The winding includes low pressure winding and high-voltage winding, and winding is using concentric Formula, and the axis direction of winding along iron core column is divided into upper and lower two layers, forms double winding quadripartion structure；The top of upper strata winding, Between two layers of winding and bottom of lower floor's winding is both provided with insulating end ring, and the insulating end ring is used to insulate.
Preferably, the iron core column and iron yoke are folded by dimensional parameters for the iron core column lamination and iron yoke of ten three grades respectively Piece is overrided to form, and iron core column cross section is 270 millimeters like circular diameter, and series is 13 grades.
Preferably, the iron core column lamination and iron yoke lamination are formed by silicon steel plate stacking, the thickness of the silicon steel sheet For 0.3 millimeter.
Preferably, the iron core is using four-piece type overlapping configuration.The iron core of transformer is by iron core column and iron yoke two Part composition, be the main magnetic circuit of transformer, in order to improve the magnetic property of magnetic circuit and less iron loss, iron core is using four Formula overlapping configuration.
Preferably, the cross section of iron yoke is rectangle in the iron core.
Preferably, the conducting wire for forming the winding is NOMEX paper bag flat type copper wires.Its electric, chemistry and machine due to NOMEX paper Tool integrality is high, and elasticity, pliability, tear resistance, humidity and wearability are all fine, and very acid-alkali-corrosive-resisting, Will not be destroyed by insect, mould and fungi, it can with all kinds varnish, adhesive, transformer liquid, lubricating oil and Refrigerant is compatible, and another NOMEX paper heat resisting temperature is high, even if temperature is up to 220 DEG C, still maintains original insulation performance, uses NOMEX paper bags flat type copper wire can improve the performance of transformer, and improve reliability and security.
Preferably, in the Concentrical winding, internal layer is low pressure winding, and outer layer is high-voltage winding.Such structure causes The insulating requirements of transformer are easier to be met, while easy to draw the high-voltage tap changer of high-voltage winding.
Preferably, the low pressure winding uses single screw structure, and the high-voltage winding uses continuous structure.Low pressure around It is alternating expression that both winding methods of group and high-voltage winding, which can be considered as coil windings, can reduce the generation of leakage field, reduce Winding added losses, particularly eddy-current loss.Preferably, the insulating end ring thickness at the top of the upper strata winding is 18 millimeters, under The insulating end ring thickness of layer winding bottom is 28 millimeters, and the insulating end ring thickness between upper and lower two layers of winding is 34 millimeters.Insulation The thickness of end circle is bigger, and insulation effect is better, but the inside transformer space that corresponding insulating end ring occupies is bigger, so In the case of meeting space requirement, it can suitably increase the thickness of insulating end ring.
Preferably, in the low pressure winding：Coil upper and lower ends set 6 groups of insulating end rings, low-voltage coil and high-tension coil Between insulation by low-pressure side to high-pressure side successively by 3.25mm oil ducts, 5mm paper webs, 3.25mm oil ducts, 5mm paper webs, 3.25mm Oil duct is formed；In the high-voltage winding：Coil upper and lower ends set 30 groups of insulating end rings.Insulation effect between coil is good, favorably In reducing leakage field, so as to effectively improve power density.
Preferably, the low pressure winding includes 6 layers of low-voltage coil, and conducting wire is alternating expression line cake structure, wherein, 1-5 layers are led Number of wire turns is that the 9, the 6th layer conductor number of turn is 8, and oil duct gap is 2.25mm between conducting wire, conducting wire lift one's head for 2 conducting wires and around.Oil duct Play a part of insulation, cooling, heat dissipation, in this way, being on the one hand conducive to winding wiring, be on the other hand conducive to the property for making transformer Can be more stable, and obtain higher power density.
Preferably, the high-voltage winding includes 30 layers of high-tension coil, and conducting wire is alternating expression line cake structure, 1-29 layer conductor circles Number is that the 47, the 30th layer conductor number of turn is 31, gap 0.48mm between every layer conductor, and an oil duct, oil duct gap are set between every 2 layer conductor For 2.25mm, conducting wire is lifted one's head to be wrapped for 1 conducting wire.
Compared with prior art, had an advantageous effect in that using a kind of machine car transformer provided by the invention：To machine The parameters such as the dimensional parameters of car transformer iron core, leakage field, loss are optimized design, and in locomotive spatial transformer and Under the restrictive condition of weight, have devised a kind of double winding quadripartion machine car transformer, not only meet large capacity, lightweight and The technical requirements of high reliability, moreover it is possible to leakage field is efficiently reduced, reduces winding added losses, particularly eddy-current loss, so that Obtaining machine car transformer has the power density of higher.
Brief description of the drawings
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below will be to needed in the embodiment attached Figure is briefly described, it will be appreciated that the following drawings illustrate only certain embodiments of the present invention, therefore be not construed as pair The restriction of scope, for those of ordinary skill in the art, without creative efforts, can also be according to this A little attached drawings obtain other relevant attached drawings.
Fig. 1 is the closed assembly of iron core column lamination and iron yoke lamination in a kind of machine car transformer provided in an embodiment of the present invention Schematic diagram；
After Fig. 2 completes closed assembly for a kind of machine car transformer provided in an embodiment of the present invention, the structure diagram of iron core；
Fig. 3 is the structure diagram of iron core column cross section in a kind of machine car transformer provided in an embodiment of the present invention；
Fig. 4 is the schematic diagram of the approximate circle in iron core column cross section in a kind of machine car transformer provided in an embodiment of the present invention；
Fig. 5 is that iron core is packaged component and fixes and encapsulate it in a kind of machine car transformer provided in an embodiment of the present invention Design sketch afterwards；
Fig. 6 is low, high-voltage winding in a kind of double winding quadripartion machine car transformer provided in an embodiment of the present invention shows It is intended to；
Fig. 7 is a kind of front view of machine car transformer provided in an embodiment of the present invention.
Fig. 8 be a kind of machine car transformer provided in an embodiment of the present invention in, low, high-tension coil around to and signal of lifting one's head Figure；
Description of symbols in figure
Iron core 101；Iron core column 102；Iron yoke 103；Lamination 104；
Winding 201；Low pressure winding 202；High-voltage winding 203；First low pressure winding 204；Second low pressure winding 205；3rd Low pressure winding 206；4th low pressure winding 207；First high-voltage winding 208；Second high-voltage winding 209；3rd high-voltage winding 210； 4th high-voltage winding 211；Insulating end ring 212；
Package parts 301, draw screw rod 302.
Iron core column lamination 102-1, iron yoke lamination 103-1.
Embodiment
Below in conjunction with attached drawing in the embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out clear, complete Ground describes, it is clear that described embodiment is only part of the embodiment of the present invention, instead of all the embodiments.Usually exist The component of the embodiment of the present invention described and illustrated in attached drawing can be arranged and designed with a variety of configurations herein.Cause This, the detailed description of the embodiment of the present invention to providing in the accompanying drawings is not intended to limit claimed invention below Scope, but it is merely representative of the selected embodiment of the present invention.Based on the embodiment of the present invention, those skilled in the art are not doing Go out all other embodiments obtained on the premise of creative work, belong to the scope of protection of the invention.
Embodiment 1
A kind of machine car transformer, including iron core 101, package parts 301 and winding 201, institute are provided in the present embodiment State iron core 101 and heart type structure is formed by iron core column 102 and iron yoke 103, and iron core 101 is carried out using the package parts 301 Fixed and encapsulation, the iron core column 102 and iron yoke 103 laminated respectively by iron core column lamination 102-1 and iron yoke lamination 103-1 and Into, 102 cross section of iron core column is in polygon trapezium structure, when its approximate circular diameter is between 270 millimeters and 290 millimeters, iron core The series of column 102 is more than 11 grades；The winding 201 includes low pressure winding 202 and high-voltage winding 203, and winding 201 is using concentric Formula, and the axis direction of winding 201 along iron core column 102 is divided into upper and lower two layers, forms 201 quadripartion structure of double winding；Upper strata around The top of group 201, between two layers of winding 201 and bottom of lower floor's winding 201 are both provided with insulating end ring 212, the insulation End circle 212 is used to insulate.
Preferably, iron core column lamination 102-1 and iron yoke the lamination 103-1 is formed by silicon steel plate stacking, the silicon The thickness of steel disc is 0.3 millimeter.Iron core 101 is the element of transformer, is the main magnetic circuit of transformer；Iron core 101 is logical Often it is made of iron core column 102 and 103 two parts of iron yoke, in order to improve the magnetic property of iron core 101 and reduce iron loss, iron core 101 Usual thickness is 0.35-0.5mm, surface scribbles the hot rolling of insulated paint or cold-reduced silicon sheet is built up.
In the present embodiment, iron core column 102 and iron yoke 103 are respectively by iron core column lamination that dimensional parameters are ten three grades 102-1 and iron yoke lamination 103-1 are overrided to form, as shown in table 1,
The dimensional parameters of iron core column lamination and iron yoke lamination in 1 iron core of table
The iron core 101 of transformer is dimerous by iron core column 102 and iron yoke 103, is the main magnetic circuit of transformer, is The magnetic property of magnetic circuit and less iron loss are improved, iron core 101 forms two pieces using four-piece type overlapping configuration after laminating Iron core column 102, forms loop by connecting iron yoke 103 between two iron core columns 102, is as shown in Figure 1 iron core column lamination The schematic diagram of 102-1 and iron yoke lamination 103-1 closed assemblies；Design sketch after the completion of 101 closed assembly of iron core is as shown in Fig. 2, iron core column 102 cross sections are polygon trapezium structure, and series is 13 grades, as shown in figure 3, the profile of the polygon trapezium structure is one approximate Circle, as shown in Figure 3 or Figure 4, it is 270mm that can further calculate (or measuring) the polygon trapezoidal approximate circular diameter, i.e., The approximate circular diameter of 102 cross section of iron core column is 270mm, and the cross section of iron yoke 103 is rectangle in iron core 101.
In another scheme, iron core column lamination 102-1 and iron yoke lamination 103-1 are formed by silicon steel plate stacking, silicon steel The thickness of piece is 0.3 millimeter.Package parts 301 divide to be located at for upper and lower two parts, the top of package parts 301 for encapsulation The iron yoke 103 of top, the lower part of package parts 301 are used to encapsulate underlying iron yoke 103；Package parts 301 upper and lower two Divide and linked together with 6 groups of drawing screw rods 302, realize the fixation of iron core 101；Iron core 101 is fixed and sealed using package parts 301 For design sketch after dress as shown in figure 5, iron core 101 is packaged after the fixation of component 301, iron yoke 103 is entirely encapsulated in inside, Easy to setting winding 201 at iron core column 102.
In the present embodiment, remaining parameter of the machine car transformer is：Rated capacity 6456KVA, rated voltage 25000V, dielectric level LI75AC35/LI-AC 5；
Silicon steel sheet trade mark 30Q120, laminate patch coefficient 0.97.
It can be seen from the above, iron core column 102 diameter D=270mm, series n=13, most large stretch of width 260mm, the height of iron yoke 103= 220mm, always folds thickness 264mm.According to the relation of 102 series of iron core column in design of transformer principle and 101 diameter of iron core, iron core 101 diameters are in 270-290mm, series n=11, and the machine car transformer series has more two-stage, illustrates in this transformer, become The utilization of depressor inner space is more abundant, is conducive to improve 101 fill factor of iron core, is used so as to effectively improve locomotive The power density of transformer.
According to space filling factor formula：
Understand, when 101 series of iron core is more, fill factor is higher, and space utilization effect is good, and leakage field is also less；And leak The reduction of magnetic, advantageously reduces the eddy-current loss of winding 201 during transformer converges, so as to effectively reduce copper loss, limits stray field The induced potential that middle 201 conducting wire of winding produces, so as to effectively improve the copper foil density of winding 201 so that transformer efficiency is close Degree is improved.Therefore, be further probe into the transformer power density, it is necessary to leakage field to transformer and vortex damage Consumption is calculated.
Further, in the present embodiment, since the iron core column 102 of iron core 101 is multilevel shape, iron yoke 103 is rectangle, root According to formula：
Iron core column section：AtN* grades of thickness * laminate patch coefficients of=Σ series；
Iron yoke section：Ae=always fold the high * laminate patches coefficient of thickness * iron yokes；
Angle weight：GΔ=2* stem section Ast* the high H of iron yokee* silicon steel sheet proportion；
It can obtain：
Iron core column section At=32.336cm2, iron yoke section Ae=563.376cm2, estimation flux density Bm=1.5T, iron core column Magnetic flux density Bt=1.517T, iron yoke magnetic flux density Be=1.433T, iron core column specific loss Pt=0.8521W/kg, iron yoke list Bit loss consumes Pe=0.7513W/kg, the excitatory capacity q of iron core column unitt=1.0797VA/kg, qδt=2.1191VA/cm2, iron yoke list The excitatory capacity q in positione=0.9258VA/kg, qδe=1.558VA/cm2；
Technological coefficient Ko=1.3, angle weight GΔ=179.2kg, iron yoke weight Ge=602.7kg, iron core column weight Gt=716.7kg, Therefore iron core weight GFe=1499kg.
No-load loss：Po=Kpo*[(Gt+GΔ/2)*Pt+(Ge+GΔ/2)*Pe]=2052W,
Wherein, no-load loss COEFFICIENT KpoValue 1.7；
Core loss current：Ioy=Po/(10*Sn)=0.032%；
Magnetizing current is：
Ior=KO*[(Gt+GΔ/2)*qt+(Ge+GΔ/2)*qe+Nft*qδt*Aft+Nfe*qδeAfe]/(10*Sn)=0.112%,
No-load current：
No-load loss and no-load current are all the important indicators for characterizing transformer performance, from above-mentioned calculating, this transformation In device, no-load loss and no-load current are all very small, and it is more superior to be conducive to the performance of this transformer, so as to be conducive to obtain higher Power density.
Winding 201 is also the important component of transformer, and in this example, the conducting wire in winding 201 uses NOMEX Paper bag flat type copper wire；Due to NOMEX paper its electrically, chemistry and mechanical integrity it is high and elasticity, pliability, tear resistance, moisture resistance Wet and wearability is all fine, and very acid-alkali-corrosive-resisting, will not be destroyed by insect, mould and fungi, it can be with all kinds Class varnish, adhesive, transformer liquid, lubricating oil and refrigerant are compatible, and another NOMEX paper heat resisting temperature is high, even if temperature is high Up to 220 DEG C, original insulation performance is still maintained, the performance of transformer can be improved using NOMEX paper bags flat type copper wire, and raising can By property and security.Further, in the present embodiment, it is both provided with winding in two iron core columns 102 in iron core 101 201, and winding 201 is using concentric type, as shown in fig. 6, wherein, internal layer (close to the part of iron core column 102) for low pressure around Group 202, outer layer (part away from iron core column 102) is high-voltage winding 203；Winding 201 is divided into along the axis direction of iron core column 102 Upper and lower two layers, so that the agent structure of 201 quadripartion machine car transformer of double winding is formed, specifically,
Low pressure winding 202 can use single screw structure, and high-voltage winding 203 can use continuous structure.Low pressure around It is alternating expression that both winding methods of group 202 and high-voltage winding 203, which can be considered as coil windings 201, can reduce leakage field Produce, reduce by 201 added losses of winding, particularly eddy-current loss.
Low pressure winding 202 includes 6 layers of low-voltage coil, and conducting wire is alternating expression line cake structure, and the 1-5 layer conductors number of turn is the 9, the 6th The layer conductor number of turn is 8, and low-pressure side conducting wire total number of turns is 53, and oil duct gap 2.25mm between conducting wire, conducting wire is lifted one's head for 2 conducting wires simultaneously It is X-direction around, conducting wire direction of lifting one's head；Oil duct plays a part of insulation, cooling, heat dissipation, is connect in this way, being on the one hand conducive to coil Line, is on the other hand conducive to make the performance of transformer more stable, and obtains higher power density.
High-voltage winding 203 includes 30 layers of high-tension coil, and conducting wire is alternating expression line cake structure, and the 1-29 layer conductors number of turn is 47, The 30th layer conductor number of turn is 31, and high-pressure side conducting wire total number of turns is 1394, gap 0.48mm between every group of conducting wire, is set between every 2 layer conductor Put an oil duct, oil duct gap is 2.25mm, and conducting wire is lifted one's head to be wrapped for 1 conducting wire, and conducting wire direction of lifting one's head is X to Y-direction each one.
As shown in fig. 7, between the top of upper strata winding 201, two layers of winding 201 and bottom of lower floor's winding 201 is all provided with Insulating end ring 212 is equipped with, insulating end ring 212 is used for isolated windings 201, plays the purpose of insulation；Wherein, top insulating end ring 212 thickness 28mm are enclosed at 212 thickness 18mm, bottom insulation end, and it is 34mm that 212 thickness are enclosed at intermediate insulation end；The thickness of insulating end ring 212 Degree is bigger, and insulation effect is better, but the inside transformer space that corresponding insulating end ring 212 occupies is bigger, so meeting In the case of space requirement, it can suitably increase the thickness of insulating end ring 212.
In low pressure winding 202：Coil upper and lower ends set 6 groups of insulating end rings 212, between low-voltage coil and high-tension coil Insulation is by low-pressure side to high-pressure side successively by 3.25mm oil ducts, 5mm paper webs, 3.25mm oil ducts, 5mm paper webs, 3.25mm oil duct structures Into；In high-voltage winding 203：Coil upper and lower ends set 30 groups of insulating end rings 212；Insulation effect between coil is good, is conducive to subtract Small leakage field, so as to effectively improve power density.
As shown in figure 8, in the present embodiment, using alternating expression loop construction, i.e. high-voltage winding 203 and low pressure winding 202 use the structure for the arrangement that intermeshes vertically, can reduce leakage field, thus can reduce electromagnetic force and added losses, have Beneficial to the power density for improving raising machine car transformer.In alternating expression loop construction, X phases：In first low pressure winding 204 Coil winding-direction to the left, lift one's head in lower part by conducting wire；Coil winding-direction in second low pressure winding 205 to the right, lift one's head on top by conducting wire.The To the right, conducting wire is lifted one's head, and primary side is downward, and secondary is to the right for coil winding-direction in one high-voltage winding 208；Line in second high-voltage winding 209 Circle is around to the left, and conducting wire is lifted one's head, and primary side is upward, and secondary is to the right.Y phases：Coil winding-direction in 3rd low pressure winding 206 to the right, conducting wire Lift one's head in lower part；Coil winding-direction in 4th low pressure winding 207 to the left, lift one's head on top by conducting wire.In 3rd high-voltage winding 210 To the left, conducting wire is lifted one's head, and primary side is downward, and secondary is to the left for coil winding-direction；To the right, conducting wire goes out coil winding-direction in 4th high-voltage winding 211 Head primary side is upward, and secondary is to the left.
Usually there are leakage field phenomenon in transformer, wherein, since 201 conducting wire of winding is in stray field, by the leakage field line of force Institute's linkage, so will produce induced potential inside conducting wire, then will produce vortex, this vortex flow when institute inside conducting wire The resistance loss of generation is exactly conducting wire eddy-current loss, and the stray field in transformer is commonly divided into vertical and horizontal stray field, and one As in the case of based on longitudinal stray field, corresponding conducting wire eddy-current loss also has caused by longitudinal leakage field and horizontal leakage field Caused two kinds of loss, also based on the loss of longitudinal direction, using equation below, can carry out correlation computations.
Copper conductor unit mass longitudinal turbulence is lost：
Winding mean unit quality longitudinal turbulence is lost：
Entirely winding conducting wire eddy-current loss is：PE, 75=PE, 75 DEG C*G
Conducting wire unit mass longitudinal turbulence loss is expressed as with the basic copper loss percentage of unit mass：
Wherein,
In above-mentioned formula, it with the perpendicular conductor width of longitudinal leakage field, j is current density that a, which is,.
According to above-mentioned formula, the relevant parameter in transformer involved in the present embodiment can be calculated；
In low-voltage coil：The capacity of winding is 6456KVA, and voltage 950V, circle voltage is 17.9245V, and electric current is 1699A, coil turn 53, conductor cross-section 257.08mm2, current density j=6.61A/m2, a length of 1.15m of average turn, always A length of 63.4m, resistance value R=0.006029 Ω at 120 DEG C, basic copper loss are 9604W, wire weight G=599kg, winding Reactance height Hk=321.72mm, maximum longitudinal direction leakage flux B=0.193T, eddy current loss factor 229, eddy-current loss are 266W。
In high-tension coil：The capacity of winding is 6456KVA, and voltage 25000V, circle voltage is 17.9245V, and electric current is 64.56A, coil turn 1394, conductor cross-section 9.165mm2, current density j=7.044A/m2, a length of 1.83m of average turn, Overall length is 2550m, resistance value R=6.803 Ω at 120 DEG C, and basic copper loss is 113419W, wire weight G=848kg, winding Reactance height Hk=341.8mm, maximum longitudinal direction leakage flux B=0.193T, eddy current loss factor=229, eddy-current loss= 382W。
The leakage field that the transformer produces it can be seen from above-mentioned parameter is minimum, and eddy-current loss is also compared to basic copper loss Minimum, so that this transformer device structure meets the technical requirements of large capacity, lightweight and high reliability, there is higher work( Rate density.
The above description is merely a specific embodiment, but protection scope of the present invention is not limited thereto, any Those familiar with the art the invention discloses technical scope in, change or replacement can be readily occurred in, should all be contained Cover within protection scope of the present invention.

Claims (10)

  1. A kind of 1. machine car transformer, it is characterised in that including iron core, package parts and winding, the iron core by iron core column and Iron yoke forms heart type structure, and the fixation and encapsulation of iron core are carried out using the package parts, iron core column and the iron yoke difference It is overrided to form by iron core column lamination and iron yoke lamination, iron core column cross section is in polygon trapezium structure, its approximate circular diameter is between 270 When between millimeter and 290 millimeters, the series of iron core column is more than 11 grades；The winding includes low pressure winding and high-voltage winding, winding It is divided into upper and lower two layers using the axis direction of concentric type, and winding along iron core column, forms double winding quadripartion structure；Upper strata around The top of group, between two layers of winding and bottom of lower floor's winding are both provided with insulating end ring, and the insulating end ring is used to insulate.
  2. 2. machine car transformer according to claim 1, it is characterised in that the iron core column and iron yoke are joined by size respectively Number is overrided to form for the iron core column lamination and iron yoke lamination of ten three grades, and iron core column cross section is 270 millimeters like circular diameter, Series is 13 grades.
  3. 3. machine car transformer according to claim 2, it is characterised in that the iron core column lamination and iron yoke lamination are Formed by silicon steel plate stacking, the thickness of the silicon steel sheet is 0.3 millimeter.
  4. 4. machine car transformer according to claim 3, it is characterised in that the conducting wire for forming winding is flat for NOMEX paper bags Copper wire.
  5. 5. machine car transformer according to claim 4, it is characterised in that in the Concentrical winding, internal layer is low pressure Winding, outer layer are high-voltage winding.
  6. 6. machine car transformer according to claim 5, it is characterised in that low pressure uses single screw structure, and high pressure is adopted Use continuous structure.
  7. 7. according to any machine car transformers of claim 1-6, it is characterised in that the insulation at the top of the upper strata winding End circle thickness is 18 millimeters, and the insulating end ring thickness of lower floor's winding bottom is 28 millimeters, the insulating end between upper and lower two layers of winding It is 34 millimeters to enclose thickness.
  8. 8. machine car transformer according to claim 7, it is characterised in that in the low pressure winding：Coil upper and lower ends 6 groups of insulating end rings are set, the insulation between low-voltage coil and high-tension coil by low-pressure side to high-pressure side successively by 3.25mm oil ducts, 5mm paper webs, 3.25mm oil ducts, 5mm paper webs, 3.25mm oil ducts are formed；In the high-voltage winding：Coil upper and lower ends set 30 groups it is exhausted Acies circle.
  9. 9. machine car transformer according to claim 8, it is characterised in that the low pressure winding includes 6 layers of low-voltage coil, Conducting wire is alternating expression line cake structure, wherein, the 1-5 layer conductors number of turn is that the 9, the 6th layer conductor number of turn is 8, and oil duct gap is between conducting wire 2.25mm, conducting wire lift one's head for 2 conducting wires and around.
  10. 10. machine car transformer according to claim 9, it is characterised in that the high-voltage winding includes 30 floor height crimpings Circle, conducting wire is alternating expression line cake structure, and the 1-29 layer conductors number of turn is that the 47, the 30th layer conductor number of turn is 31, gap between every layer conductor 0.48mm, an oil duct, oil duct gap 2.25mm are set between every 2 layer conductor, and conducting wire is lifted one's head to be wrapped for 1 conducting wire.
CN201711446139.9A 2017-12-27 2017-12-27 A kind of machine car transformer Pending CN108010683A (en)

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CN108878116A (en) * 2018-06-29 2018-11-23 常德国力变压器有限公司 A kind of outlet method and bus connection method of railway transformer winding
CN109841393A (en) * 2019-03-25 2019-06-04 孙崇山 Winding alternating expression distribution transformer
CN109841394A (en) * 2019-03-25 2019-06-04 孙崇山 The core type transformer of winding alternating expression arrangement

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CN206379274U (en) * 2017-01-10 2017-08-04 广西柳州特种变压器有限责任公司 A kind of helical winding
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CN2884453Y (en) * 2006-04-21 2007-03-28 苏州杭申星州变压器有限公司 Non-crystalline alloy single-phase transformer
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CN108878116A (en) * 2018-06-29 2018-11-23 常德国力变压器有限公司 A kind of outlet method and bus connection method of railway transformer winding
CN108878116B (en) * 2018-06-29 2020-08-18 常德国力变压器有限公司 Wire outgoing method and wire connecting method for railway transformer winding
CN109841393A (en) * 2019-03-25 2019-06-04 孙崇山 Winding alternating expression distribution transformer
CN109841394A (en) * 2019-03-25 2019-06-04 孙崇山 The core type transformer of winding alternating expression arrangement
CN109841394B (en) * 2019-03-25 2021-10-22 孙崇山 Core type transformer with staggered windings
CN109841393B (en) * 2019-03-25 2021-10-26 孙崇山 Winding staggered distribution transformer

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