CN101295576A

CN101295576A - Iron core of power transformer

Info

Publication number: CN101295576A
Application number: CNA2007100111663A
Authority: CN
Inventors: 齐会南
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-04-29
Filing date: 2007-04-29
Publication date: 2008-10-29

Abstract

An iron core of a power transformer is composed of two opened spiral type cores with semicircular sections arranged in parallel and an opened spiral core which surrounds the panes outside the two cores and also has a semicircular section. The sections of three stems are rotundity, step shape (circumscribed circle) and polygon (circumscribed circle). During the manufacture process, as the opened characteristics of the cores, loops can be independently coiled and the cores can be opened on the location of the opened clearance to mount or exchange the loops when in manufacturing and maintaining.

Description

A kind of electrical transformer cores

Affiliated technical field

Type of the present invention relates to a kind of iron core that is assemblied in the power transformer.

Background technology

The major part of power transformer is iron core and coil.Coil is that high and low pressure copper cash and insulating barrier coiling are made.The iron core major part of present domestic power 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 existence of 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 transformers producer to adopt the takeup type iron core, the takeup type iron core is called the volume iron core again, this iron core is that the silicon strip continuous reeling by definite shape forms, and the takeup type iron core has a certain upgrade than the performance of laminated core structure, is mainly reflected in that no-load loss is low, noise is little.But because the takeup type iron core is jointless structure, also there are problems, as: manufacturing equipment production capacity is limited, needs special-purpose spooling equipment during the iron-core coil coiling, and will be with iron core to wind the line, and 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, and in a single day transformer coil breaks down, and just can't take off coil from iron core and change, and must cause scrapping of whole transformer.

Summary of the invention

Type of the present invention provides a kind of electrical transformer cores, and this iron core is an open coil iron core.Open coil iron core is exactly in the iron core manufacture process, the silicon steel sheet billot carries out continuously coiling successively after clocklike shearing disconnection, a fracture is arranged in every layer, and every layer fracture site is carried out the regular linear arrangement under the coiling of coiling iron core machine, and fracture site is located at yoke or following yoke.Type of the present invention has thoroughly solved the low shortcoming of laminated core structure performance and no seam and has rolled up iron core and have defective on the manufacturing process.The cross sectional shape of three stem stems of the described iron core of type of the present invention can be rounded, step (external circle) or polygon (external circle), and the cross sectional shape of corresponding coil cover be a circle.Because the open nature that iron core presents makes whole iron core not need special-purpose coil-winding equipment in production and maintenance process.Type of the present invention can assemble oil-immersed power transformer and dry-type power transformer.

The technical scheme that its technical problem that solves type of the present invention adopts is: this iron core 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 semicircular single-phase open coil iron core of indent formation placed side by side, is that its tee section of ' mouth ' font is that the semicircular 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.Three stem stem cross sections of iron core are circular.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.Reel the thickness of silicon strip that whole iron core adopts at 0.18mm between the 0.35mm.Type of the present invention above-mentioned if during the cross sectional shape semicircular in shape of every single-phase open coil iron core, the cross section of three stem stems of iron core after assembly unit accordingly is intact is rounded; If the cross sectional shape of every single-phase open coil iron core is step (external semicircle), the cross section of three stem stems of iron core after assembly unit accordingly is intact is step (external circle); If the cross sectional shape of every single-phase open coil iron core is polygon (external semicircle), the cross section of three stem stems of iron core after assembly unit accordingly is intact is polygon (external circle).The iron core aperture position can be at last yoke or following yoke.Rolled iron core needs to handle through annealing process, finish after the iron core production iron core opening part opened layer by layer and take the shape of the letter U, again the good required primary and secondary coil of coiling is inserted in each stem stem, again that iron core is closed layer by layer and install upper and lower folder, draw terminals again, can assemble power transformer.

The beneficial effect of type of the present invention is, this electrical transformer cores possesses characteristics such as magnetic circuit is short, power factor is high, volume is little, the ability of anti-sudden short circuit is strong, process conditions are good, and the iron core of doing capacity of the same race can descend more than 10% than the production cost of traditional iron core.Do not need the spooling equipment of special-purpose volume iron core special use in manufacturing process, coil coiling has separately improved production efficiency.By the transformer of this iron core assembling in use coil in a single day break down, the transformer core opening part can be opened, take out coil then and keep in repair and change, fundamentally solved the problems that the volume iron core produces owing to no seam.

Description of drawings

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

Fig. 1 is the decomposition view of type of the present invention.

Fig. 2 is that core post of the present invention is circular 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 circle).

Fig. 4 is that core post of the present invention is the stem stem cross sectional view of polygon (external circle).

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 every layer of silicon steel sheet of the single-phase iron core of Fig. 7.

The scope of the size range of the iron core of corresponding different capabilities: H is that 400mm is to 2000mm among Fig. 2; 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; Iron core stem stem cross section circular diameter scope is that 60mm is to 500mm.

The number of steps in Fig. 3 iron core stem stem cross section is referred to as the progression (representing with n) of iron core, and the scope of corresponding different capabilities iron core n is 5～19, and iron core stem stem cross section circumscribed circle diameter scope is that 60mm is to 500mm.

The scope of the polygon number in corresponding different capabilities iron core stem stem cross section is 8～50 among Fig. 4, and iron core stem stem cross section circumscribed circle diameter scope is that 60mm is to 500mm.

Specific embodiments

Referring to Fig. 1, this iron core is the rectangle framework of the semicircular 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 semicircular 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 circular by two indents semicircles and the semicircle butt joint of evagination, and the cross section of three stem stems of iron core that assembling finishes is circle.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 semicircle), the cross section of three stem stems of iron core that assembling finishes is step (external circle).Referring to Fig. 4, if the cross sectional shape of every open coil iron core is polygon (an external semicircle), the cross section of three stem stems of iron core that assembling finishes is polygon (external circle).The cross sectional shape of corresponding coil cover is circular.Referring to Fig. 5, Fig. 7, 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 (15) of every silicon steel sheet of a shape of every silicon steel sheet of two single-phase iron cores of internal layer (14) and a single-phase iron core of skin, the fracture of every layer of silicon steel sheet (10) and (11); Referring to Fig. 6, Fig. 7, aperture position also can be in following yoke (7)～(9), the shape (17) of every silicon steel sheet of a shape of every silicon steel sheet of two single-phase iron cores of internal layer (16) and a single-phase iron core of skin, the fracture of every layer of silicon steel sheet (12) and (13).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 the closed layer by layer colligation fixed installation folder that restores of iron core is got final product assembling transformer.

Claims

1. electrical transformer cores, it is characterized in that: this iron core is the rectangle framework of the semicircular 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, another cross section is that the semicircular single-phase open coil iron core rectangle framework of evagination (3) is wrapped up (1), (2) in it, for circular, corresponding different capabilities iron core stem stem cross section diameter of a circle scope is that 60mm is to 500mm entirely in the cross section of three posts of iron core that assembly unit finishes.

2. a kind of electrical transformer cores 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 semicircle), the cross section of three posts of iron core that assembly unit finishes is step (external circle) entirely, the scope of iron core n is 5～19, and the diameter range of corresponding different capabilities iron core stem stem cross section circumscribed circle is that 60mm is to 500mm.

3. a kind of transformer core 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, and iron core stem stem cross section circumscribed circle diameter scope is that 60mm is to 500mm.

4. a kind of transformer core according to claim 1 is characterized in that: the fracture site of iron core is in last yoke (4)～(6), the every silicon steel sheet (14) of two single-phase iron cores of internal layer and the every silicon steel sheet (15) of a single-phase iron core of skin.

5. a kind of transformer core according to claim 1 is characterized in that: the fracture site of iron core is being descended yoke (7)～(9), the every silicon steel sheet (16) of two single-phase iron cores of internal layer and the every silicon steel sheet (17) of a single-phase iron core of skin.

6. a kind of transformer core 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.

7. a kind of transformer core according to claim 1 is characterized in that: 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.