CN101276676A

CN101276676A - Oil-immersed type transformer for hatch winding iron core with oval-shaped cross section

Info

Publication number: CN101276676A
Application number: CNA2007100107348A
Authority: CN
Inventors: 齐会南; 李毅强; 苟东宇
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-03-27
Filing date: 2007-03-27
Publication date: 2008-10-01

Abstract

Provided is an open rolled iron core oil-immersed type power transformer with an elliptical section. According to the invention, defects in the laminated iron core performance and jointless rolled iron core manufacturing technology are thoroughly solved. The transformer is characterized in that an iron core frame is manufactured by winding silicon steel strip materials via circular, elliptical, tridimensional trigonal open iron core winders which are provided in the invention with the application number of 20060029267.9; the sections of three columns of the iron core are formed by butt connecting two indent hemicycles and a convex hemicycle, the sections of three columns of the iron core after assembling are ellipse, step-shape (internal ellipse) or polygon (internal ellipse) structures. Compared with a non-open rolled iron core dry transformer with a circular section, the oil-immersed type power transformer of the invention has shorter magnetic circuit, higher power factor, small volume, better processing performance, lower no-load loss and no-load current, reduced noise, and 10% or more reduced manufacturing cost; the transformer of the invention has the iron core with open characteristic, thereby, the coil can be winded singly, the transformer is easy to manufacture and maintain, and is suitable for the capability of 30 KVA to 3450 KVA.

Description

The cross section is the elliptical openings coiled iron core oil-immersed type transformer

Affiliated technical field

The present invention relates to a kind of high performance power transformer.Belong to the electroporation field.

Background technology

During the iron core of power transformer, coil and fuel tank were formed, the iron core major part of oil-filled transformer capacity more than 800kVA was also in the stacked technical pattern that adopts the silicon steel sheet stack to form.The junction, every layer of limit of laminated core causes magnetic resistance and iron loss to increase owing to all have many places mitre, and the exciting current of transformer is also increased, and has reduced power factor, has had a strong impact on the power supply quality of electrical network; The seam of laminated core has also caused the transformer running noises big.Comparatively Xian Jin employing volume iron core technology, overcome the defective of laminated core, the volume iron core has promoted transformer performance, has that no-load loss is low, the little advantage of noise.But, still have the problems that are difficult to overcome because the volume iron core designs for jointless structure.Such as, the spooling equipment band of making the special use of transformer coil arts demand iron core and is wound the line, and winding process difficulty, complexity, production efficiency are low, cause production capacity limited.The coiling of especially large and medium-sized transformer and paint-dipping process manufacturing can't solve; User's maintenance is also very difficult, in case the transformer coil breaks down, just causes scrapping of whole transformer; The popularization and the use of volume iron core have been restricted.

Summary of the invention

The invention provides a kind of cross section is elliptical openings coiled iron core oil-immersed type power transformer, and it is low and do not have seam coiled iron core oil-immersed type power transformer and be present in defective in manufacturing, technology, the maintenance thoroughly to solve laminated core oil-immersed power transformer performance.The technology of oil-immersed type power transformer for hatch winding iron core of the present invention, techniqueflow, iron core adopt special equipment, and promptly the applicant provides circle, oval, three-dimensional triangular form open core up-coiler production at application number in for 200610029267.9; After disconnecting again, the curve silicon steel sheet billot of being left by the transformer broken line cutting machine of special use successively turns to the cross section oval-shaped iron core that is as the criterion continuously, a fracture is arranged in every layer, by clocklike carrying out linear array, fracture site is located at side column under coiling iron core machine automatic control system for every layer of fracture site, go up yoke or yoke down.Cross section of the present invention is that the cross sectional shape of three stem stems of ellipse open coil iron core designs with the inherent specification requirement of different capabilities transformer, but ovalize, step (in connect ellipse) or polygon (in connect ellipse), the cross sectional shape of corresponding coil cover be an ellipse; Because iron core presents open nature, making does not need to roll up the coil-winding equipment of iron core special use in whole transformer manufacturing and the maintenance.Particularly stem stem is that ellipsoidal structure no-load loss descends 10% again than similar volume iron core, no-load current descends about 20%, noise reduces more than 4 decibels, saves silicon strip about 10% than the volume iron core of the rounded structure in cross section, and the whole manufacturing cost of transformer reduces more than 10%.

Technical characterictic of the present invention is that the cross section of oil-immersed type power transformer for hatch winding iron core iron core is for oval, the major axis of corresponding different capabilities transformer and the proportion of minor axis (being a and b) are 1: 0.4～1: 0.7, the size range of major axis be 20mm to 500mm, the size range of minor axis is that 10mm is to 350mm; The iron core framework be by two face shapings be its cross section of hollow be the half elliptic open coil iron core of indent placed side by side to constitute a face shaping be horizontal " day " font iron core framework, be that its tee section of big hollow is that the half elliptic open coil iron core framework of evagination is closely wrapped reality in horizontal stroke " day " font iron core framework outside by a face shaping; The cross section of three stem stems of iron core all is to be formed by two indent half elliptics and an evagination half elliptic butt joint, and three stem stem cross sections are oval.The Wound core technological requirement with the silicon strip billot after cut-out continuously coiling make iron core more tight, the gap of iron core fracture is 0.2mm, the thickness of silicon strip at 0.18mm between the 0.35mm.The cross sectional shape of every single-phase open coil iron core of the present invention is half elliptic, step (in connect half elliptic), polygon (in connect half elliptic) structure, the cylinder of the cross section ovalize of three stem stems of iron core after assembly unit is intact, step (in connect ellipse), polygon (in connect ellipse) structure.The iron core aperture position can be at last yoke or down yoke also can be at side column; Rolled iron core needs annealing process to handle; Finished fabrication of iron core more just iron core U-shaped opening part open, elementary, the secondary coil required the good transformer of coiling assemble, and the device body that assembles is put into fuel tank add upper cover and draw terminals, four groups of fin of casing are distributed in four sides.The transformer kind of elliptical openings coiled iron core oil-immersed type transformer correspondence is a threephase oil immersed transformer, and capacity is at 30KVA～3150KVA.

Effect of the present invention.Similar relatively technical scheme, the cross section is that the performance of elliptical openings coiled iron core oil-immersed type power transformer is circular reel iron core transformer than the cross section, and magnetic circuit is shorter, power factor is higher, volume is littler, the ability of anti-sudden short circuit is strong, process conditions good, silicon strip saves about 10%; No longer need the special-purpose spooling equipment of special-purpose volume iron core in production technology, coil coiling has separately improved production efficiency, and production cost can descend more than 10%.In a single day transformer in use coil breaks down, and the transformer core opening part can be opened, and takes out coil and keeps in repair and change, and has thoroughly solved the problems that the volume iron core produces owing to no seam.

Description of drawings

The present invention will be further described in conjunction with the accompanying drawings and embodiments.

Fig. 1 is the iron core view of type of the present invention; Fig. 2 is that core post of the present invention is oval-shaped stem stem cross sectional view; Fig. 3 is that core post of the present invention is the stem stem cross sectional view of step (in connect ellipse); Fig. 4 is that core post of the present invention is the stem stem cross sectional view of polygon (in connect ellipse); Fig. 5 fracture site is at the view of the iron core of last yoke; Fig. 6 fracture site is at the view of the iron core of following yoke; The view of the iron core that Fig. 7 has assembled; The outside drawing of Fig. 8 type of the present invention; The view of every layer of silicon steel sheet of the single-phase iron core of Fig. 9.

The core dimensions scope of corresponding transformer different capabilities among Fig. 1: the scope of H is that 400mm is to 2000mm; The scope of H1 is that 350mm is to 1800mm; The scope of Hw is that 300mm is to 1500mm; The scope of L1 is that 125mm is to 450mm; The scope of L is that 400mm is to 950mm; The scope of Mo is that 170mm is to 750mm; The yoke wide region is that 100mm is to 350mm.

N is 7 among Fig. 3, and promptly progression is 7 grades.

The scope of the size range of corresponding different capabilities transformer: h is that 700mm is to 2500mm among Fig. 8; The scope of h1 is that 200mm is to 1200mm; The scope of b1 is that 500mm is to 2000mm; The scope of b2 is that 400mm is to 1600mm.

Embodiment

Referring to Fig. 2.This transformer core is the rectangle framework of the half elliptic open coil iron core of indent (1), (2) horizontal strokes of formation placed side by side " day " font by two face shapings for the hollow cross section, and another cross section is that the half elliptic open coil iron core rectangle of evagination framework (3) is wrapped up (1), (2) in it.

Referring to Fig. 5, Fig. 6, Fig. 7.The cross section of three stem stems of this transformer core all is that the cross section of three stem stems of iron core that assembling finishes is ellipse by two indent half elliptics and an evagination half elliptic butt joint ovalisation.Three the single-phase iron cores that whole iron core adopted of reeling all be silicon strip after cut-out continuously coiling form, rather than the iron core that coiling is good successively cuts off, referring to Fig. 3; If the cross sectional shape of every open coil iron core is step (in connect half elliptic), the cross section of three stem stems of iron core that assembling finishes is step (in connect ellipse), referring to Fig. 4; If the cross sectional shape of every open coil iron core is polygon (in connect half elliptic), the cross section of three stem stems of iron core that assembling finishes is polygon (in connect ellipse), and the cross sectional shape of corresponding coil cover be an ellipse.

Referring to Fig. 8,9.This transformer core opening part is to have fracture and even cloth billot to reel successively by silicon strip to form, and aperture position can be in last yoke (4)～(6), and aperture position also can be in following yoke (7)～(9).Assembly unit finishing type iron core is heat-treated after shaping, again open core is opened into a U type at the aperture slots place, the height that coiling is good, low-voltage coil is packed in three iron core column, then the closed layer by layer recovery colligation of iron core is fixedly mounted folder and puts into fuel tank and add upper cover, draw three bushings (13) and three low-tension bushings (11) and ground wire (16) from the top, oil level indicator (15), exhaust apparatus (12), shunting switch (10), three bushings (13) of transformer outer tip end are first row, oil level indicator (15), exhaust apparatus (12), shunting switch (10) is second row, three low-tension bushings (11) and ground wire (16) are the 3rd row, and four groups of fin (14) are distributed on four sides.

Referring to Fig. 9, (17)～(18) are the monolithic silicon steel sheet of fracture site at last yoke; (19)～(20) be the monolithic silicon steel sheet of fracture site at following yoke; (21)～(22) be the monolithic silicon steel sheet of fracture site on side column.

Above embodiment is only for the usefulness that the present invention is described, but not limitation of the present invention, relevant expert, insider, engineers and technicians under the situation that does not break away from the spirit and scope of the present invention, all can make various modification or perfect.Therefore, all technical schemes that are equal to also should belong to category of the present invention, should be limited by each claim.

Claims

1. a cross section is an elliptical openings coiled iron core oil-immersed type power transformer, it is characterized in that iron core is the half elliptic open coil iron core of indent (1) by two face shapings for ' mouth ' font cross section, (2) the rectangle framework of a horizontal stroke of formation placed side by side ' day ' font, another cross section is that the half elliptic open coil iron core rectangle of evagination framework (3) is with (1), (2) wrap up in it, the cross section of three stem stems of iron core all is by two indent half elliptics and an evagination half elliptic butt joint ovalisation, the cross section of three posts of iron core after the assembly unit is oval entirely, the proportion of corresponding different capabilities transformer core column section major axis and minor axis (being a and b) is 1: 0.4～1: 0.7, the size range of major axis be 20mm to 500mm, the size range of minor axis is that 10mm is to 350mm.

2. elliptical openings coiled iron core oil-immersed type power transformer as claimed in claim 1, the cross sectional shape that it is characterized in that every single-phase open coil iron core (1), (2), (3) is step (in connect half elliptic), the cross section of three posts of iron core that assembly unit finishes is step (in connect ellipse) entirely, the scope of corresponding different capabilities transformer n is 5～19, the proportion of major cross-sectional axis and minor axis (being a and b) is 1: 0.4～1: 0.7, the size range of major axis be 20mm to 500mm, the size range of minor axis is that 10mm is to 350mm.

3. elliptical openings coiled iron core oil-immersed type power transformer as claimed in claim 1, the cross sectional shape that it is characterized in that every single-phase open coil iron core (1), (2), (3) is polygon (in connect semicircle), the cross section of three posts of iron core that assembly unit finishes is polygon (inscribed circle shape) entirely, the scope of the polygon number of corresponding different capabilities transformer core column section is 8～50, the proportion of major cross-sectional axis and minor axis (being a and b) is 1: 0.4～1: 0.7, the size range of major axis be 20mm to 500mm, the size range of minor axis is that 10mm is to 350mm.

4. elliptical openings coiled iron core oil-immersed type power transformer as claimed in claim 1 is characterized in that the fracture site of iron core can be two positions, in last yoke (4)～(6), in following yoke (7)～(9).

5. elliptical openings coiled iron core oil-immersed type power transformer as claimed in claim 1, it is characterized in that every single-phase iron core be by silicon strip after cut-out continuously coiling form, reel silicon strip thickness that every single-phase iron core adopted between 0.18mm～0.35mm.

6. elliptical openings coiled iron core oil-immersed type power transformer as claimed in claim 1 is characterized in that the size range of the iron core of corresponding different capabilities, and the scope of H is that 400mm is to 2000mm; The scope of H1 is that 350mm is to 1800mm; The scope of Hw is that 300mm is to 1500mm; The scope of L1 is that 125mm is to 450mm; The scope of L is that 400mm is to 950mm; The scope of Mo is that 170mm is to 750mm; The yoke wide region is that 100mm is to 350mm.

7. elliptical openings coiled iron core oil-immersed type power transformer as claimed in claim 1, it is characterized in that the size range of corresponding different capabilities transformer: the scope of h is that 1000mm is to 3000mm; The scope of h1 is that 200mm is to 1200mm; The scope of b1 is that 600mm is to 1600mm; The scope of b2 is that 400mm is to 1600mm.

8. elliptical openings coiled iron core oil-immersed type power transformer as claimed in claim 1, three bushings (13) that it is characterized in that the transformer outer tip end are first row, oil level indicator (15), exhaust apparatus (12), shunting switch (10) are second row, three low-tension bushings (11) and ground wire (16) are the 3rd row, and four groups of fin (14) are distributed on four sides.

9. elliptical openings coiled iron core oil-immersed type transformer as claimed in claim 1 is characterized in that corresponding transformer kind is a threephase oil immersed transformer, and capacity is at 30KVA～3150KVA.