CN101266874A

CN101266874A - An oil immersed transformer

Info

Publication number: CN101266874A
Application number: CNA2007100379802A
Authority: CN
Inventors: 齐侠
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-03-12
Filing date: 2007-03-12
Publication date: 2008-09-17

Abstract

An oil-filled transformer comprises an oil tank, a high voltage bushing (13), a low voltage bushing (11), a ground wire (16), an oil level indicator (15), an exhaust (12), a tapping switch (10), four groups of radiating fins (14). Iron cores of the transformer are composed of two arrayed-in-parallel opening coiled iron cores with semi-elliptical sections and the opening coiled iron core with semi-elliptical square section which is surrounded the two former iron cores. In the process of production, due to the opening property of the iron cores, the winding can be independently manufactured; and when producing and maintaining, the iron cores can be opened at the opening gaps for installation or replacement of the windings.

Description

A kind of oil-filled transformer

Affiliated technical field

Type of the present invention relates to a kind of high performance oil-immersed power transformer.

Background technology

Oil-filled transformer mainly is made up of iron core, coil and fuel tank, and the iron core major part of at present domestic oil-filled transformer is a laminated structure, is formed by the silicon steel sheet stack.Because all there is many places mitre in the iron core of stack moulding in junction, every layer of limit, and causes the increase of magnetic resistance and iron loss, 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 transformer core seam has also caused the big problem of running noises.In order to overcome the defective of above-mentioned laminated core structure, domestic in recent years have many producers to adopt the takeup type appendiron core transformer, this transformer core is that the silicon strip continuous reeling by definite shape forms, and transformer performance has a certain upgrade, and is mainly reflected in that no-load loss is low, noise is little.But because the takeup type iron core is a jointless structure, also there are problems, as: manufacturing equipment production capacity is limited, needs special-purpose spooling equipment during the transformer coil coiling, and be with iron core to wind the line, winding process difficulty, complexity, production efficiency are low.Especially can't solve big-and-middle-sized transformer coiling and paint-dipping process.The maintenance aspect is very difficult especially, in case the transformer coil breaks down, just can't take off coil from iron core and change, and must cause scrapping of whole transformer.Owing to have above-mentioned shortcoming, restricted the popularization and the use of no seam volume iron core.

Summary of the invention

Type of the present invention provides a kind of oil-filled transformer, and its iron core is an open coil iron core.Open coil iron core is exactly in the iron core manufacture process, the curve silicon steel sheet billot of being left by the transformer curve cutting machine of special use successively turns to the cross section oval single-phase open coil iron core that is as the criterion continuously after disconnection, a fracture is arranged in every layer, by clocklike carrying out linear array, fracture site is located at yoke or yoke down under coiling iron core machine automatic control system for every layer of fracture site.Type of the present invention has thoroughly solved the low shortcoming of laminated core structure oil-immersed power transformer performance and no seam coiled iron core oil-immersed type power transformer and has had defective on the manufacturing process.But the cross sectional shape ovalize of three stem stems of the described transformer core of type of the present invention, step (external ellipse) or polygon (external ellipse), the cross sectional shape of corresponding coil cover is oval.Because the open nature that iron core presents makes whole transformer not need not have the coil-winding equipment of seam volume iron core special use in producing and keeping in repair.The capacity of the oil-immersed power transformer of type of the present invention: the capacity of threephase oil immersed transformer can be at 30KVA～3150KVA.

The technical scheme that its technical problem that solves type of the present invention adopts is: the iron core stem stem cross section of this transformer 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 of this transformer is to be horizontal " day " font iron core framework by two face shapings for its cross section of ' mouth ' font is face shaping of the half elliptic single-phase open coil iron core of indent formation placed side by side, is that its tee section of ' mouth ' font is that the half elliptic single-phase open coil iron core framework of evagination is closely wrapped reality greatly in horizontal " 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.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, the advantage of coiling is to make iron core more closely reach the iron core fracture neatly not have burr continuously.The gap of iron core fracture is 0.2mm, the thickness of silicon strip at 0.18mm between the 0.35mm.The above-mentioned cross sectional shape as if every single-phase open coil iron core of type of the present invention is half elliptic, the cross section ovalize of three stem stems of iron core after assembly unit accordingly is intact; If the cross sectional shape of every single-phase open coil iron core is step (external half elliptic), the cross section of three stem stems of iron core after assembly unit accordingly is intact is step (external ellipse); If the cross sectional shape of every single-phase open coil iron core is polygon (external half elliptic), the cross section of three stem stems of iron core after assembly unit accordingly is intact is polygon (external ellipse).The iron core aperture position can be at last yoke or following yoke.Rolled iron core needs annealing process to handle, finish and iron core U-shaped opening part is opened the back layer by layer after the fabrication of iron core technology the good transformer of coiling required elementary, secondary coil are assembled, again that iron core is closed layer by layer and folder is installed, the iron core 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 beneficial effect of type of the present invention is, this oil-filled transformer possesses good characteristics such as magnetic circuit is shorter, power factor is higher, volume is littler, the ability of anti-sudden short circuit is strong, process conditions are good, and the transformer of doing capacity of the same race can descend more than 10% than the production cost of traditional transformer.Do not need the spooling equipment of special-purpose volume iron core special use in manufacturing process, coil coiling has separately improved production efficiency.In a single day transformer in use coil breaks down, and the transformer core opening part can be opened, and takes out coil then and keeps in repair and change, and has fundamentally solved the problems that the volume iron core produces owing to no seam.Particularly stem stem is that oval-shaped structure no-load loss descends 10% again than other coiled core, no-load current descends about 20%, noise reduces more than 4 decibels, saves silicon strip 10% than the volume iron core of the rounded structure in cross section, and the whole cost of transformer reduces more than 10%.

Description of drawings

Below in conjunction with drawings and Examples type of the present invention is further specified.

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 (external ellipse).

Fig. 4 is that core post of the present invention is the stem stem cross sectional view of polygon (external 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 assembling finishes in Fig. 7 type of the present invention.

The external view 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 scope of the size range of the iron core of corresponding different capabilities: H is that 400mm is to 2000mm among Fig. 1; 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.

The number of steps in the iron core stem stem cross section of Fig. 3 transformer is referred to as the progression (representing with n) of iron core, the scope of the iron core n of corresponding different capabilities transformer transformer 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.N is 7 among Fig. 3, and promptly progression is 7 grades.

The scope of the polygon number in the iron core stem stem cross section of corresponding different capabilities transformer is 8～50 among Fig. 4, 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.

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.

Specific embodiments

Referring to Fig. 1, this transformer core is the rectangle framework of the half elliptic single-phase open coil iron core of indent (1), (2) horizontal strokes of formation placed side by side ' day ' font by two face shapings for ' mouth ' font cross section, and another cross section is that the half elliptic single-phase open coil iron core rectangle framework of evagination (3) is wrapped up (1), (2) in it.Referring to Fig. 2, the cross section of three stem stems of iron 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 are that silicon strip continuous coiling after cut-out forms, 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 (an external half elliptic), the cross section of three stem stems of iron core that assembling finishes is step (external ellipse).Referring to Fig. 4, if the cross sectional shape of every open coil iron core is polygon (an external half elliptic), the cross section of three stem stems of iron core that assembling finishes is polygon (external ellipse).The cross sectional shape of corresponding coil cover is oval.Referring to Fig. 5, Fig. 9, the iron core opening part is to have the fracture and the billot that evenly distributes to reel successively by silicon strip to form, aperture position can be when last yoke (4)～(6), the shape (18) of every silicon steel sheet of a shape of every silicon steel sheet of two single-phase iron cores of internal layer (17) and an outer single-phase iron core; Referring to Fig. 6, Fig. 9, aperture position also can be in following yoke (7)～(9), the shape (19) of every silicon steel sheet of a shape of every silicon steel sheet of two single-phase iron cores of internal layer (20) and an outer single-phase iron core.Referring to Fig. 7, assembly unit finishing type iron core is heat-treated after shaping, again open core is opened into a U type layer by layer at the aperture slots place, the high and low pressure coil that coiling is good is packed in three iron core column, then with iron core closed layer by layer restore colligation fixed installation folder and put into fuel tank add upper cover.Referring to Fig. 8, 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), four groups of fin (14) are distributed on four sides.

Claims

1. oil-filled transformer, it is characterized in that: the iron core of transformer is the half elliptic single-phase 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 single-phase open coil iron core rectangle framework of evagination (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 that assembly unit finishes is entirely for oval, 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. oil-filled transformer according to claim 1, it is characterized in that: when the cross sectional shape of every single-phase open coil iron core (1), (2), (3) is step (external half elliptic), when the cross section of three posts of iron core that assembly unit finishes is step (external ellipse) entirely, the scope of the iron core n of corresponding different capabilities transformer is 5～19, the proportion of external oval-shaped major axis in cross section 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. oil-filled transformer according to claim 1, it is characterized in that: when the cross sectional shape of every single-phase open coil iron core (1), (2), (3) is polygon (external semicircle), the cross section of three posts of iron core that assembly unit finishes is polygon (external circle) entirely, the scope of the polygon number in the iron core stem stem cross section of corresponding different capabilities transformer 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. oil-filled transformer according to claim 1 is characterized in that: the fracture site of iron core is two positions, in last yoke (4)～(6), in following yoke (7)～(9).

5. oil-filled transformer according to claim 1 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. oil-filled transformer according to claim 1 is characterized in that: the size range of the iron core of corresponding different capabilities transformer, the scope of H are 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. oil-filled transformer according to claim 1 is characterized in that: the apparent size scope 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. oil-filled transformer according to claim 1, it is characterized in that: three bushings (13) of 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. oil-filled transformer according to claim 1 is characterized in that: the kind of corresponding transformer is a threephase oil immersed transformer, capacity 30KVA～3150KVA.