CN2432668Y

CN2432668Y - Triangle iron-core electric transformer

Info

Publication number: CN2432668Y
Application number: CN 00220995
Authority: CN
Inventors: 吴茂安
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-07-08
Filing date: 2000-07-08
Publication date: 2001-05-30
Anticipated expiration: 2010-07-08

Abstract

The utility model relates to an electric transformer, particularly a triangle iron-core electric transformer which is formed by that a silicon steel strip is wound. The utility model comprises a low-voltage winding and a high-voltage winding which are wound on an iron-core pole of a triangle iron core, the triangle iron core, an oil tank, a bracket, and accessories of a tank cover. Insulating oil is filled into the oil tank. The triangle iron core, the high-voltage winding, the low-voltage winding and the bracket are all immersed in the insulating oil. The triangle iron core of the transformer is formed by that three complete selfsame iron cores are assembled. The cross section of the iron core pole almost is circular. The cross section is arranged in an equilateral triangle. The utility model has the advantages of small size, light weight, low loss, material saving, balance three-phase current, etc.

Description

The triangle iron core power transformer

The utility model relates to power transformer, and the continuous silicon strip of specifically a kind of usefulness is wound into the approximate rounded triangle iron core power transformer in cross section.

The existing power transformer is divided into stacked and takeup type two big classes.The iron core column of stacked three-phase power transformer iron core and iron yoke all are by being cut into different in width, the horizontal stripe of different single piece of silicon steel band and vertical bar are inlayed repeatedly, and dress forms, therefore between transformer fe stem stem and the iron yoke many slits are arranged, cause the magnetic loop of iron core to be interrupted discontinuous, the no-load current and the no-load loss of transformer are increased, and produce leakage field and noise.

The iron core of takeup type three-phase power transformer then is that the continuous silicone steel band lap wound with various different in width forms, it has reduced interruption and slit between the silicon steel sheet, but its cross section becomes stepped, so the cross section activity coefficient is not high, and its three iron core column comprises that laminated core structure in the past also is like this in same plane.Therefore, cause the magnetic loop of A phase, C phase long, the magnetic loop of B phase is shorter, causes the power transformer three-phase current unbalance.In sum, laminated core structure and takeup type iron core exist obvious defects on structural design, need further improvement.

The purpose of this utility model is a kind of triangle iron core power transformer of design, to reduce the no-load current and the no-load loss of transformer, alleviates iron core weight, saves material.

Its main technical schemes comprises triangle iron core and is wound on low pressure winding and high pressure winding on the triangle iron core post, and support, fuel tank and case lid annex, pour into insulating oil in the fuel tank, triangle iron core, high and low pressure winding and support all soak in insulating oil, it is characterized in that: triangle iron core is identical by three, assembled with the single-phase iron core that continuous silicon strip coiling forms, it is circular that the cross section of its iron core column is approximately, and being the equilateral triangle layout, the cross section of the iron core column of single-phase iron core and iron yoke all is semicircle.

The center of circle of the circular cross section of three iron core column of triangle iron core constitutes an equilateral triangle DEF, each iron core column is made up of the iron core column of the single-phase iron core of two cross section semicirculars in shape, the extended line of the diameter of the semi-circular cross-section of the iron core column of three single-phase iron cores is the center O by this equilateral triangle DEF all, and and the surface of coiling steel band constitute 60 degree angles.

The low pressure winding skeleton that tubular is arranged between iron core column and the low pressure winding is used the stay stretching between iron core column and the low pressure winding skeleton, can not become flexible to guarantee insulation distance and low pressure winding.

Being the insulation oil duct between low pressure winding and the high pressure winding, is the high pressure winding skeleton of tubular outside the insulation oil duct, and the high pressure winding is wrapped on the high pressure winding skeleton.

The case lid annex is made up of case lid, High-Voltage Insulation terminal, low-voltage insulation terminal, shunting switch, thermometer base, suspension ring, oil conservator, oil meter and dehydrating breather; The case lid of fuel tank is the equilateral triangle shape, and the angle top portion is the circular arc of 120 degree, and is tangent with the both sides of case lid respectively, High-Voltage Insulation terminal triangularity on the case lid is arranged, low-voltage insulation terminal being aligned is arranged, and shunting switch is positioned at the center of case lid, and the angle top portion of case lid is equipped with three suspension ring.

The fuel tank profile is the equilateral triangle column, and radiator and nameplate are installed in the fuel tank side, and oil discharging valve is installed in the fuel tank bottom.

The utility model has the advantages that: because triangle iron core is to reel with continuous silicon strip to form, it is circular that the iron core column cross section is approximately, and being the equilateral triangle column arranges, so iron core magnetic resistance minimum, the cross section activity coefficient is the highest, and the three-phase magnetic loop is equal fully, has reached the structural requirement of ideal transformer design.It is little, in light weight to have a volume with the power transformer of this iron core manufacturing, and loss is low, and material is economized, a series of outstanding advantages such as three-phase balance! It is the desirable renewal product of power industry.

Fig. 1 is a structure chart of the present utility model.

Fig. 2 is an outline drawing of the present utility model.

Fig. 3 is the vertical view of Fig. 2.

Fig. 4 is the structure chart of triangle iron core.

Fig. 5 is for clipping the state diagram behind part iron core column and the iron yoke among Fig. 4.

Fig. 6 is for clipping the state diagram after the first half among Fig. 4.

Fig. 7 is the sectional drawing of three iron core column of triangle iron core.

As shown in the figure: with continuous silicon strip be wound into earlier three identical, iron core column 23 is semicircular single-phase iron core with the cross section of iron yoke 24, three single-phase iron cores are bolted together, the cross section of forming three iron core column 9 all is approximately circular triangle iron core 8 again.

Insulating board is rolled into cylindrical shape, forms low pressure winding skeleton 10, be sleeved on the iron core column 9, utilize special-purpose coil winding machine that low pressure winding skeleton 10 is rotated, can be on low pressure winding skeleton 10, coiling low pressure winding 11.

After winding low pressure winding 11, the stay curtain is wrapped in the outside, forms insulation oil duct 12, insulating oil 15 flows in oil duct 12, is beneficial to the heat radiation of winding.

At stay curtain surface coiling one deck insulating board, form high pressure winding skeleton 13, and coiling high pressure winding 14 in the above, to 30-50KVA small-power electric power transformer, generally do not establish cooling oil duct in the high pressure winding 14; For the bigger power transformer of the above power of 100KVA, we set up a cooling oil duct at 1/3 number of turns place of high pressure winding.The initial and end end of low pressure winding 11 links to each other with low-voltage insulation terminal 1, the initial and end end of high pressure winding 14 and tapping point and High-Voltage Insulation terminal 2 and 3 corresponding linking to each other of shunting switch.

Case lid 5 is the equilateral triangle shape, and its angle top portion is the circular arc of 120 degree, and is tangent with the both sides of case lid 5 respectively.High-Voltage Insulation terminal 2 is installed, low-voltage insulation terminal 1, shunting switch 3, thermometer base 4 and suspension ring 22 above the case lid 5.Wherein, shunting switch 3 is positioned at the center of case lid 5, and High-Voltage Insulation terminal 2 triangularities arrange that low-voltage insulation terminal 1 being aligned is arranged, and in the angle of case lid 5 top portion three suspension ring 22 is installed respectively.

The top of case lid 5 is columnar oil conservators 17, and oil meter 16 is installed in oil conservator 17 sides, and the oil mass in the liquid level demonstration fuel tank 7 of oil meter 16 how much, and oil conservator 17 belows are equipped with dehydrating breather 18, are used for the moisture of absorbent insulation oil 15.

The profile of fuel tank 7 is the triangle column, perfusion insulating oil 15 in the case, and triangle iron core 8 and high and low pressure winding 14,11 and shunting switch 3 and support 6 all soak in insulating oil 15.3 sides of fuel tank 7 all are equipped with radiator 19, and insulating oil 15 circulates in radiator 19, to reduce the temperature rise of transformer core 8 and high and low pressure winding 14,11.Nameplate 20 is attached on the radiator 19, shows the specifications and models of transformer.Oil discharging valve 21 is arranged at the bottom of fuel tank 7, to be convenient for changing the insulating oil 15 in the case.Hook 25 also is equipped with in the side of fuel tank, is used for the lifting and the transportation of transformer.

Claims

1, the triangle iron core power transformer, comprise triangle iron core (8) and be wound on low pressure winding (11) and high pressure winding (14) on the triangle iron core post (9), and support (6), fuel tank (7) and case lid annex, insulating oil (15) is poured in fuel tank (7) lining, triangle iron core (8) is with high, low pressure winding (14), (11) and support (6) all soak in insulating oil (15), it is characterized in that: triangle iron core (8) is identical by three, assembled with the single-phase iron core that continuous silicon strip coiling forms, it is circular that the cross section of its iron core column (9) is approximately, and being the equilateral triangle layout, the cross section of iron core column of single-phase iron core (23) and iron yoke (24) all is semicircle.

2, power transformer according to claim 1, the center of circle of circular cross section that it is characterized in that three iron core column (9) of triangle iron core (8) constitutes an equilateral triangle DEF, each iron core column (9) is made up of the iron core column (23) of the single-phase iron core of two cross section semicirculars in shape, the extended line of the diameter of the semi-circular cross-section of the iron core column of three single-phase iron cores (23) is the center O by this equilateral triangle DEF all, and and the surface of coiling steel band constitute 60 degree angles.

3, power transformer according to claim 1, it is characterized in that having between iron core column (9) and the low pressure winding (11) the low pressure winding skeleton (10) of tubular, use the stay stretching between iron core column (9) and the low pressure winding skeleton (10), can not become flexible to guarantee insulation distance and low pressure winding (11).

4, power transformer according to claim 1, it is characterized in that between low pressure winding (11) and the high pressure winding (14) it being insulation oil duct (12), outside insulation oil duct (12) is the high pressure winding skeleton (13) of tubular, and high pressure winding (14) is wrapped on the high pressure winding skeleton (13).

5, power transformer according to claim 1 is characterized in that the case lid annex is made up of case lid (5), High-Voltage Insulation terminal (2), low-voltage insulation terminal (1), shunting switch (3), thermometer base (4), suspension ring (22), oil conservator (17), oil meter (16) and dehydrating breather (18).

6, power transformer according to claim 1 or 5, the case lid (5) that it is characterized in that fuel tank (7) is the equilateral triangle shape, the angle top portion is the circular arc of 120 degree, respectively and the both sides of case lid (5) tangent, High-Voltage Insulation terminal (2) triangularity on the case lid (5) is arranged, low-voltage insulation terminal (1) being aligned is arranged, and shunting switch (3) is positioned at the center of case lid (5), and the angle top portion of case lid (5) is equipped with three suspension ring (22).

7, power transformer according to claim 1 is characterized in that fuel tank (7) profile is the equilateral triangle column, and radiator (19), hook (25) and nameplate (20) are installed in fuel tank (7) side, and oil discharging valve (21) is installed in fuel tank (7) bottom.