CN2332048Y

CN2332048Y - Three-phase distribution transformer

Info

Publication number: CN2332048Y
Application number: CN 98236334
Authority: CN
Inventors: 金玮; 李明; 付原
Original assignee: Individual
Current assignee: Individual
Priority date: 1998-09-10
Filing date: 1998-09-10
Publication date: 1999-08-04
Anticipated expiration: 2008-09-10

Abstract

The utility model discloses a three phase distribution transformer, which is composed of an iron core, a high voltage winding, a low voltage winding, a tertiary winding, a high voltage casing tube, a low voltage casing tube, an oil tank, iron core clamps, a pressure release valve, and a heat radiator. The utility model is characterized in that the iron core comprises six silicon-steel sheet rolling rings, the cross section of the silicon steel sheet rolling ring is in a step shape, or a rhombus shape, or a rectangle shape, the window of the iron core is a rectangle whose four corners are provided with circular arcs, three rolling rings are equilateral triangular prisms, the other three rolling rings are arranged at the three edges of the three equilateral triangular prisms, and each side of the three rolling rings is spliced into an iron core column whose external connection graphic is circular or rectangular. Three iron core columns are arranged in the iron core, and the high and low voltage windings are wound around the iron core column. The utility model has the advantages of simple structure, short magnetic path, material saving, low cost, small zero load, small load loss, and obvious effect of energy saving.

Description

A kind of three-phase distribution transformer

The utility model relates to a kind of three-phase distribution transformer, the middle low capacity distribution transformer of particularly a kind of low-loss, material saving.

The high problem of middle-size and small-size three-phase transformer ubiquity loss in using at present.It is relevant with making with the version of iron core to trace it to its cause, and the iron core of three-phase transformer adopts folded iron core of three-phase three-column and three-phase and five-pole iron core usually.These two kinds of iron core processing are complicated, and seam is many; Another kind is three frames, three a posts volumes iron core (cut or do not cut), because the magnetic flux exchange seldom can be arranged between the three frame iron cores, makes that deformity takes place magnetic flux in the iron core, thereby limited its scope of application that loss is corresponding also higher.

The purpose of this utility model has provided a kind of three-phase distribution transformer, adopts six ring-like silicon sheet cores that roll, rational in infrastructure, material-saving saving of labor, and every ring magnetic flux distribution is consistent, thereby iron loss is little, cost is low.

For achieving the above object, the utility model adopts following scheme: it is made of parts such as iron core, high-voltage coil and low-voltage coil, radiator, high-voltage connection terminal, bushing, low-voltage wiring terminal, low-tension bushing, iron core folder, pressure relief valves, it is characterized in that iron core is that six silicon steel sheets roll ring (not otch or otch) composition, the cross section that silicon steel sheet rolls ring is stairstepping, rhombus or rectangle, and core window is the rectangle of four jiaos of band circular arcs.Three in six annular cores roll ring and are equilateral triangular prism, and three roll ring on three ribs of equilateral triangular prism in addition, Yi Bian the iron core column that it is circle or rectangle that three each that roll ring are combined into an external figure.Three iron core column are arranged in the iron core, and high-voltage coil and low-voltage coil is wound on the iron core column.Promptly be combined into the tri-phase iron core that three iron core column are arranged that connects each other with six annular cores, three each limits that rolls ring in the iron core column are lined with insulant each other, and the outside constitutes an integral body with no latitude band or high contraction bands colligation.Coiling high-voltage coil and low-voltage coil respectively on three posts of iron core, high-voltage coil and low-voltage coil is the cartridge type winding, high-tension coil and low-voltage coil arrange or arranged crosswise successively, is wound with tertiary coil on the limit of the not coiling high-voltage coil and low-voltage coil of iron core.Iron core folder shape and core configuration correspond to the equilateral triangle that has three extended lines, are installed on the iron core, will go up the tension of lower core folder with screw rod, and by insulation pressing iron core, high-voltage coil and low-voltage coil are compressed, fix.

Fig. 1 is a kind of three-phase distribution transformer device structure schematic diagram.

Fig. 2 is a kind of three-phase distribution transformer vertical view.

Fig. 3 is a kind of three-phase distribution transformer core, coil vertical view.

Fig. 4 is that a kind of three-phase distribution transformer core, coil axes are surveyed view.

With reference to the accompanying drawings the utility model is described in further detail below: as can be known according to Fig. 1, Fig. 2, Fig. 3, Fig. 4, three-phase distribution transformer core 10 rolls ring by six silicon steel sheets and forms, have the high-voltage coil and low-voltage coil 12 of three iron core column 15 three-phases to be wound on respectively on three iron core column 15, iron core 10 is changed with the height of high-voltage coil and low-voltage coil 12 combination realization voltages.Iron core 10 is that six silicon steel sheets roll ring, and the cross section that silicon steel sheet rolls ring is rhombus, stairstepping or rectangle, and iron core 10 windows are the rectangle of four jiaos of band circular arcs, and three iron core column 15 cross sections are stairstepping, polygon or rectangle.Iron core column 15 adopts strapping to fix, and resin pickup.High-voltage coil and low-voltage coil 12 is the drum type brake winding, and high-tension coil and low-voltage coil can be to arrange successively, also can arranged crosswise.High-tension coil enamelling cuprum round line (lenticular wire) coiling, low-voltage coil is to build up rectangle by many flat type copper wires in broadside with compound flat type copper wire coiling, compound flat type copper wire, the outsourcing insulant.Stick with the broadside of recombination line during the coiling low-voltage coil that (every flat type copper wire forming recombination line is that narrow limit is attached on the winding former) rotation coiling forms on the winding former, except that three iron core column 15 that are wound with high-voltage coil and low-voltage coil 12, be wound with tertiary coil 11 on three limits in addition in six rings of iron core 10.High-voltage coil and low-voltage coil 12 can be connected into different groups, and three-phase high-voltage coil and low-voltage coil 12 is wound on three iron core column 15.Three are not wound with tertiary coil 11 around iron core 10 limits of high-voltage coil and low-voltage coil 12, and tertiary coil 11 can be connected into triangle to reduce zero sequence impedance or the empty usefulness that do not connect.Iron core 10, high-voltage coil and low-voltage coil 12, tertiary coil 11 usefulness folders from top to bottom 9 borrow cross-over block to strain up and down with screw rod, make iron core 10 high-voltage coil and low-voltage coils 12 and tertiary coil 11 relative fixed constitute the integrated transformers core.Device core suspension rod 8 is contained on the upper clamping piece transformer core is lifted on the case lid 3.The head end of three-phase high-voltage coil and low-voltage coil is drawn by bushing 7, low-tension bushing 4, is connected with outside line with low-voltage wiring terminal 5 through high-voltage connection terminal 6, and tail end is coupled to each other by the wiring group requirement.Fill transformer oil in the iron fuel tank 1, and carry the transformer core that iron core 10, high-voltage coil and low-voltage coil 12, tertiary coil 11, folder from top to bottom 9 etc. are formed.In order to guarantee heat radiation, radiator 13 is housed on the shell.Earth stud 14 connects iron core ground wire and external ground wire, guarantees safety utilization of electric power.Pressure relief valve 2 is when temperature rise is too high in transformer occurring, and release pressure keeps safe operation in the transformer.

The utility model compared with prior art, following advantage is arranged: iron circuit is more reasonable, three-phase magnetic circuit Symmetry, magnetic flux distribution is more even, has given full play to the characteristic of silicon steel sheet. Magnetic circuit is short, reduced silicon steel sheet Usage quantity. The iron core column cross section is stairstepping or polygon, and external figure is round, so comparatively save with copper cash Economize, cost is low, and is unloaded, load loss is little, thereby reduced load, open circuit loss, saves material. Knot Structure is simple, and energy-saving effect is remarkable.

Claims

1, a kind of three-phase distribution transformer, it is by high-voltage coil and low-voltage coil (12), bushing (7), low-tension bushing (4) constitutes, it is characterized in that iron core (10) is that six silicon steel sheets roll ring, the cross section that silicon steel sheet rolls ring is a stairstepping, prismatic or rectangle, iron core (10) window is the rectangle of four jiaos of band circular arcs, three roll ring and are equilateral triangular prism, three roll ring on three ribs of equilateral triangular prism in addition, the iron core column (15) that it is circle or rectangle that three each limits that rolls ring are combined into an external figure, three iron core column (15) are arranged in the iron core (10), and high-voltage coil and low-voltage coil (12) is wound on the iron core column (15).

2, a kind of distribution transformer according to claim 1 is characterized in that in the iron core column (15) three roll between each limit of ring to be lined with insulant, and the outside is with no latitude band or high contraction bands colligation.

3, a kind of distribution transformer according to claim 1 is characterized in that high-voltage coil and low-voltage coil (12) is circle copper formula winding, and high-tension coil and low-voltage coil are arranged or arranged crosswise successively.

4, a kind of distribution transformer according to claim 1 is characterized in that being wound with tertiary coil on the limit of the not coiling high-voltage coil and low-voltage coil (12) of iron core (10).

5, a kind of distribution transformer according to claim 3 is characterized in that low-voltage coil with compound flat type copper wire coiling, and compound flat type copper wire is that the cross section is that the copper cash or the insulated copper wire of rectangle builds up rectangle in broadside, the outsourcing insulant.