CN101271755A

CN101271755A - Dry power transformer

Info

Publication number: CN101271755A
Application number: CNA2007100381681A
Authority: CN
Inventors: 齐会南
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-03-19
Filing date: 2007-03-19
Publication date: 2008-09-24

Abstract

The invention provides a dry-typed electric transformer, comprising an iron core, a low-voltage coil (13), an insulation layer (15), a high voltage coil (14), an upper clamping part (12), a lower clamping part (11), a high voltage wiring terminal (16) and a low voltage wiring terminal (10). The iron core is formed by that two open coiled iron cores with O-shaped appearance and internally concave semi-round section are arranged in parallel to form a transverse theta-shaped rectangle frame; another open coiled iron core rectangle frame with externally convex semi-round section wraps the transverse theta-shaped rectangle frame. The section of three columns of assembled iron core can be round or step-shape (circumcircle shape) or polygon (circumcircle). As the iron core has opening characteristic, the coil can be enwound separately, and the iron core at the U-shaped opening gap can be opened to carry out the installation or to replace the coil during the production and maintenance, thus leading the whole process to be convenient and fast.

Description

A kind of dry-type power transformer

Affiliated technical field

Type of the present invention relates to a kind of dry-type power transformer.

Background technology

Dry-type power transformer mainly is made up of iron core and coil, and the core structure of at present domestic traditional dry-type power transformer is stacked and two kinds of takeup types.Laminated core structure is to be 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, thereby cause the increase of magnetic resistance and iron loss, the exciting current of transformer is also increased, reduced power factor, had a strong impact on the power supply quality of electrical network, the existence of iron core seam has also caused the big problem of running noises.The takeup type iron core is to be reeled by the silicon strip of definite shape to form, 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, 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 has designed a kind of dry-type power transformer, and its iron core is an open coil iron core, has thoroughly solved the problem that performance is low and coil iron core dry-type power transformer technology is made of laminated core structure dry-type power transformer.Open coil iron core is exactly in the iron core manufacture process, the curve silicon steel sheet billot of being left by the iron core curve cutting machine of special use successively turns to iron core continuously after disconnection, a fracture is arranged in every layer, by clocklike carrying out linear array, fracture site is located at yoke, yoke or side column down under coiling iron core machine automatic control system for every layer of fracture site.The cross sectional shape of three stem stems in the described transformer core of type of the present invention is circle, step (external circle) or polygon (external circle), and the cross sectional shape of corresponding high and low pressure coil cover is circular.Because iron core has open nature, make whole transformer in producing and keeping in repair, not need special-purpose volume iron-core coil spooling equipment.The kind of the dry-type power transformer that type of the present invention relates to and capacity: three-phase F level epoxy resin dry type transformer, capacity is at 30KVA～3150KVA; The non-insulating dry type transformer of sealing of H level NOMEX impregnated, capacity is at 30KVA～3150KVA.

The technical scheme that its technical problem that solves type of the present invention adopts is: the iron core of this transformer is the semicircular single-phase open coil iron core of the indent rectangle framework of forming a horizontal stroke ' day ' font placed side by side by two face shapings for its cross section of ' mouth ' font, is that the semicircular single-phase open coil iron core frame structure of evagination closely wraps reality in their outsides by a cross section, and whole iron core adopts thickness to roll to the cold rolled silicon steel billot of 0.35mm at 0.18mm and forms.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 cross section of three stem stems of iron core all is to be formed by two indents semicircles and the semicircle butt joint of evagination, and three stem stem cross sections are circular.The cross sectional shape of every single-phase open coil iron core that type of the present invention is above-mentioned can also be step (external semicircle) or polygon (external semicircle), and the cross section of three stem stems of iron core that assembling finishes is corresponding to be step (external circle) or polygon (external circle).The aperture position of every single-phase open coil iron core can be at last yoke, following yoke or side column.Can respectively the iron core opening part successively be opened after the annealed PROCESS FOR TREATMENT of three-phase three stem stem open coil iron cores that the open coil iron core of employing said structure is made and be ' U ' type structure, the good transformer of coiling required elementary, secondary coil are inserted in three stem stems, then with iron core closed layer by layer and install, lower clamping piece, draw high-voltage terminal and low voltage terminal at last and be complete dry-type power transformer.

The beneficial effect of type of the present invention is that this dry-type power transformer has characteristics such as magnetic circuit is short, performance is high, power factor is high, material is expected in saving, little, the anti-sudden short circuit ability of volume is strong, good manufacturability.The utilance of material is 100% when cross sectional shape is step (external circle).The spooling equipment that in manufacturing process, does not need special-purpose volume iron core special use, coil coiling separately, production efficiency is very high, is fit to large-scale production.In the transformer use, in a single day transformer coil breaks down, and the transformer core opening part can be opened and after take out the back coil be keeped in repair and changes, and has 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 type aperture position of the present invention is at the iron core view of last yoke.

Fig. 2 type aperture position of the present invention is at the iron core view of following yoke.

Fig. 3 type aperture position of the present invention is at the iron core view of side column.

Fig. 4 core column section of the present invention is circular iron core view.

Fig. 5 core column section of the present invention is the iron core view of step (external circle).

Fig. 6 core column section of the present invention is the iron core view of polygon (external circle).

The front view and the vertical view of the transformer that Fig. 7 type assembling of the present invention is complete.

The view of every layer of silicon steel sheet of the single-phase iron core of Fig. 8.

The scope of the size range of the iron core of corresponding different capabilities: H is that 400mm is to 2000mm among Fig. 4, Fig. 5, Fig. 6; 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 iron core stem stem cross section circular diameter scope of corresponding different capabilities transformer is that 60mm is to 500mm among Fig. 4.

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

The scope of the polygon number in the iron core stem stem cross section of corresponding different capabilities transformer is 8～50 among Fig. 6, and the diameter range of cross section circumscribed circle is that 60mm is to 500mm.

The transformer apparent size scope of corresponding different capabilities among Fig. 7: the scope of a is that 415mm is to 1300mm; The scope of b is that 100mm is to 750mm; The scope of c is that 420mm is to 2500mm.

Specific embodiments

Referring to Fig. 1, the iron core opening part is successively to be cut off mouth and evenly distributed to reel by silicon strip to form, aperture position can be in last yoke (4), (5), this transformer core is the rectangle framework of the semicircular 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 open coil iron core rectangle of evagination framework (3) is wrapped up (1), (2) in it.Referring to Fig. 4, three stem stem cross sections of open coil iron core all are circular by two indents semicircles and the semicircle butt joint of evagination, and the cross section of three stem stems of iron core of having assembled 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.Referring to Fig. 5, if the cross sectional shape of every single-phase open coil iron core is step (an external semicircle), the cross sectional shape of three stem stems of iron core of having assembled is step (an external circle).Referring to Fig. 6, if the cross sectional shape of every single-phase open coil iron core is polygon (an external semicircle), the cross sectional shape of three stem stems of iron core of having assembled is polygon (an external circle).The cross sectional shape of corresponding coil cover is circular.Referring to Fig. 1, Fig. 8, 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 when last yoke (4), (5), the shape (18) of every silicon steel sheet of the outer single-phase iron core of the shape of every silicon steel sheet of two single-phase iron cores of internal layer (17) and; Referring to Fig. 2, Fig. 8, aperture position when down yoke (6), (7), the shape (22) of every silicon steel sheet of a shape of every silicon steel sheet of two single-phase iron cores of internal layer (21) and an outer single-phase iron core; Referring to Fig. 3, Fig. 8, aperture position when side column (8), (9), the shape (20) of every silicon steel sheet of the outer single-phase iron core of the shape of every silicon steel sheet of two single-phase iron cores of internal layer (19) and.Referring to Fig. 7, the iron core of assembly unit finishing type is heat-treated after shaping, again open core is opened into a U type at the aperture slots place, the low-voltage coil that coiling is good (13) is packed in three iron core column, then with the outside fastening insulating barrier (15) of every group of low-voltage coil, the high-tension coil (14) that coiling is good is packed into wherein in the insulating barrier outside again, at last the successively closed recovery colligation of iron core is fixedly mounted upper clamping piece (12) and lower clamping piece (11) and draws high-voltage terminal (16) and low voltage terminal (10).At last, glue together, flood, dry, assemble dry-type power transformer.

Claims

1. dry-type power transformer, it is characterized in that: the iron core of this transformer be by two face shapings for " mouth " font cross section be the rectangle framework of the semicircular open coil iron core of an indent horizontal stroke of formation placed side by side " day " font, another cross section is that the semicircular open coil iron core rectangle of evagination framework is wrapped up the rectangle framework of horizontal " day " font in it, the cross section of three stem stems of iron core all is to be formed by two indents semicircles and the semicircle butt joint of evagination, the cross section of three posts of iron core that assembling finishes is for circular, and the iron core stem stem cross section diameter of a circle scope of corresponding different capabilities transformer is that 60mm is to 500mm.

2. a kind of dry-type power transformer according to claim 1, it is characterized in that: the cross sectional shape of every single-phase open coil iron core is step (an external semicircle), the cross section of three posts of iron core that assembling finishes is step (an external circle), the scope of the iron core n of corresponding different capabilities transformer is 5～19, and the diameter range of core section circumscribed circle is that 60mm is to 500mm.

3. a kind of dry-type power transformer according to claim 1, it is characterized in that: the cross sectional shape of every single-phase open coil iron core is polygon (an external semicircle), the cross section of three posts of iron core that assembling finishes is polygon (external circle) entirely, the limit scope of counting of the polygon number in the iron core stem stem cross section of corresponding different capabilities transformer is 8～50, and the diameter range of core section circumscribed circle is that 60mm is to 500mm.

4. a kind of dry-type power transformer according to claim 1 is characterized in that: the fracture site of iron core is three positions, in last yoke (4), (5), in following yoke (6), (7), in side column (8), (9).

5. a kind of dry-type power 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. a kind of dry-type power 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. a kind of dry-type power transformer according to claim 1 is characterized in that: the apparent size scope of the transformer of corresponding different capabilities, the scope of a are that 415mm is to 1300mm; The scope of b is that 100mm is to 750mm; The scope of c is that 420mm is to 2500mm.

8. a kind of dry-type power transformer according to claim 1, it is characterized in that: the high-tension coil of transformer (14), low-voltage coil (13) are outside three iron core column, insulating barrier (15) is in the middle of high-tension coil and low-voltage coil, upper clamping piece (12) and lower clamping piece (11) fastening the last yoke of iron core and following yoke, one side of the high-voltage terminal of drawing (16) yoke on transformer, the another side of the low voltage terminal of drawing (10) yoke on transformer.

9. a kind of dry-type power transformer according to claim 1 is characterized in that: the kind and the capacity of relevant dry-type power transformer, and three-phase F level epoxy resin dry type transformer, capacity is at 30KVA～3150KVA; The non-insulating dry type transformer of sealing of H level NOMEX impregnated, capacity is at 30KVA～3150KVA.