KR20160121966A - Insulation structure of transformer winding - Google Patents

Abstract

The winding insulation structure of the transformer according to the present invention is characterized in that the winding is insulated by using two or more insulating paper having different properties and the area where the electric field is concentrated by increasing the overlapping area between the insulating sheets from the winding center to the outside .

Description

INSULATION STRUCTURE OF TRANSFORMER WINDING [0002]

The present invention relates to a winding insulation structure of a transformer, and more particularly, to a winding insulation structure of a transformer having a multilayer insulating paper.

The transformer is an electrical energy conversion device that converts high voltage to low voltage or low voltage to high voltage. A simple transformer has a configuration in which at least two windings 2a and 2b are wound around one core (or core) 1 forming a magnetic path as shown in Fig.

1 is a view for explaining the principle of a transformer.

Referring to FIG. 1, when a voltage is applied to U and V of the primary winding 2a, a voltage is applied to the secondary winding 2b by the electromagnetic induction law so that the voltages u and v appear.

When a load is connected to u and v of the secondary winding 2b, current flows to the windings 2a and 2b to generate heat, which is a part of the electric energy is converted into heat energy.

Generally, an insulating paper (not shown) is used to prevent the occurrence of dielectric breakdown at a point where the electric potential around the windings 2a and 2b is low when alternating current is supplied to the conductors or the windings 2a and 2b .

In the case of insulating paper having insufficient tensile force when the windings 2a and 2b of the transformer are wound around the core 1, the windings 2a and 2b are warped and the outer side Or the boundary surface that is generated when the insulating paper is blown from the inside or the insulating paper is opened may occur. These defects can degrade the dielectric strength and lead to transformer accidents.

In addition, there is a problem that when the winding insulation design is performed with a single insulating paper within a certain thickness, the insulation performance is deteriorated.

It is an object of the present invention to provide a winding insulation structure of a transformer that can reduce defects that may occur in the design of insulation and efficiently increase the dielectric strength.

Other objects and features of the present invention will be described in the following description of the invention and the claims.

According to an aspect of the present invention, there is provided a winding insulation structure of a transformer, including: a conductor; A first insulating paper wound around the conductor; And a second insulating paper and a third insulating paper which sequentially or alternately wrap the circumference of the first insulating paper, wherein the first insulating paper is made of an insulating paper having a relatively high heat resistance relative to the second and third insulating paper, The insulating paper may be composed of an insulating paper having a relatively strong tensile force with respect to the first and second insulating paper.

At this time, the second insulating paper may be composed of an insulating paper having an intermediate heat resistance and a tensile force relatively to the first and third insulating paper.

The first, second, and third insulating paper may have a predetermined width with respect to the longitudinal direction of the conductor and may be configured to be wound in an oblique direction.

At this time, the first, second, and third insulating paper may be configured to be wound in an oblique direction so as to overlap a predetermined width.

At this time, the first, second, and third insulating paper may be wound so that the overlapping portion between the first, second, and third insulating paper is gradually thickened to a certain width as the portion becomes closer to the conductor.

As described above, the winding insulator structure of the transformer according to an embodiment of the present invention can reduce the concentration of the electric field and improve the tensile force and the dielectric strength of the coil insulation.

Further, since the thickness of the winding can be reduced by improving the dielectric strength, the transformer can be made lighter and smaller.

1 is a view for explaining the principle of a transformer;
2 is a cross-sectional view schematically showing a power input transformer;
3 is a perspective view schematically showing a winding insulation structure of a transformer according to a first embodiment of the present invention.
4 is a perspective view schematically showing a winding insulation structure of a transformer according to a second embodiment of the present invention;
5 is a perspective view schematically showing a winding insulation structure of a transformer according to a third embodiment of the present invention.
6 is a perspective view schematically showing a winding insulation structure of a transformer according to a fourth embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of a winding insulation structure of a transformer according to the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and the manner of achieving them, will be apparent from and elucidated with reference to the embodiments described hereinafter in conjunction with the accompanying drawings. It should be understood, however, that the invention is not limited to the disclosed embodiments, but is capable of many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, To fully disclose the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification. The dimensions and relative sizes of the layers and regions in the figures may be exaggerated for clarity of illustration.

It will be understood that when an element or layer is referred to as being another element or "on" or "on ", it includes both intervening layers or other elements in the middle, do. On the other hand, when a device is referred to as "directly on" or "directly above ", it does not intervene another device or layer in the middle.

The terms spatially relative, "below," "lower," "above," "upper," and the like, And may be used to easily describe the correlation with other elements or components. Spatially relative terms should be understood to include, in addition to the orientation shown in the drawings, terms that include different orientations of the device during use or operation. For example, when inverting an element shown in the figures, an element described as "below" or "beneath" of another element may be placed "above" another element. Thus, the exemplary term "below" can include both downward and upward directions.

The terminology used herein is for the purpose of describing embodiments only and is not intended to be limiting of the invention. In the present specification, the singular form includes plural forms unless otherwise specified in the specification. &Quot; comprise "and / or" comprising ", as used in the specification, means that the presence of stated elements, Or additions.

A transformer is a device that raises or lowers an AC voltage or current. It includes a power transformer installed in a transmission line and a distribution line, and a coupling transformer used in an electronic circuit.

The power transformer includes a transmission transformer for lowering the voltage from the power plant to the primary substation and a distribution transformer for lowering the high voltage at the receiving point.

In addition, the transformer includes a coil wound around an iron core, that is, an inflow transformer insulated with an insulating oil (insulating oil), an epoxy resin having a high electrical characteristic around the coil, and the periphery thereof is filled with epoxy resin having high mechanical strength ) A mold transformer, and an amorphous transformer using an amorphous magnetic material made of a metal mixture.

Of these transformer types, the inflow transformer is inexpensive, has low noise, can be installed outdoors, and is used in many places.

The present invention is not limited to the type of the above-mentioned transformer, but for the convenience of explanation, the inflow transformer will be described as an example.

An inflow transformer is a transformer in which a high-voltage winding and a low-voltage winding are placed inside an enclosure or tank (hereinafter referred to as "tank") and the inside of the enclosure is filled with insulating oil. The insulating oil is responsible for the electrical insulation between the high-voltage winding and the low-voltage winding, while allowing the heat generated during the operation of the transformer to be diverted to the outside of the enclosure through the action of the insulating oil.

2 is a cross-sectional view schematically showing a power input transformer.

Referring to FIG. 2, the power transformer may include a tank 110 and a transformer main body 120 accommodated in the tank 110.

The tank 110 is a portion forming a housing of the transformer.

The tank 110 can be manufactured using a cold-rolled steel sheet, and can be designed and manufactured in consideration of sufficient mechanical strength so that it can withstand the internal pressure sufficiently and does not cause deformation due to transportation and various impacts.

The power transformer of the present invention can be constituted by, for example, a so-called power inflow transformer in which insulating oil (oil) is accommodated in the tank 110.

The power input transformer of the present invention may be constituted by, for example, a power input transformer of 5 ㎹A or more.

An oil tank 112 may be provided on one side of the tank 110, for example, on the upper side.

The oil tank 112 can communicate with the tank 110.

A connection pipe 114 connecting the oil tank 112 and the tank 110 may be provided under the oil tank 112.

A controller 116 may be provided on one side of the tank 110.

The tank 110 may be provided with a high-voltage side terminal 117 and a low-voltage side terminal (not shown), respectively.

The high-voltage side terminal 117 and the low-voltage side terminal do not necessarily have to be located on the upper side, but may also be provided on the side.

In one region of the tank 110, a grounding portion 113 may be provided.

The other end of the grounding cable 113 having one end embedded in the ground may be connected to the grounding unit 113.

The transformer main body 120 can be accommodated in the tank 110.

A tap-changer 118 may be provided on the inner side of the tank 110.

The transformer main body 120 includes an iron core 130 forming a magnetic circuit, a winding 140 provided around the iron core 130, and a frame 140 supporting the iron core 130 and the winding 140 150).

The iron core 130 can be formed by inserting and stacking, for example, a high permeability electric steel plate (directional silicon steel plate) without aging.

The iron core 130 can be configured so that the windings 140 of three phases (for example, phases A, B, and C) can be wound.

Although not shown in detail, the iron core 130 has, for example, three vertical portions in which the windings 140 of each phase are wound (wound) and horizontal portions horizontally arranged at the upper and lower ends of the vertical portion, .

A frame 150 may be provided around the iron core 130 to support the iron core 130.

The frame 150 may include a lower frame 160 disposed below the iron core 130 and an upper frame 180 disposed above the iron core 130, for example.

The frame 150 may be provided with a ground connection 182 for connection with the tank 110 for grounding. For example, the ground connection portion 182 may be formed to protrude upward from one side of the upper frame 180.

The ground connection 182 may be configured to be connected to the tank 110 by, for example, a ground cable 184. Also, the ground connection 182 may be configured to be directly connected to the tank 110.

A connection plate (not shown) may be provided on the outer side of the iron core 130.

Each of the phase windings 140 may be provided on each vertical portion of the iron core 130.

The winding 140 may include a primary winding and a secondary winding having mutually predetermined winding ratios so that the voltage can be changed.

For example, a secondary winding may be provided around the iron core 130, and a primary winding may be provided outside the secondary winding 140b.

The primary and secondary windings can be arranged concentrically.

These windings 140 differ in structure and method depending on capacity, voltage and usage.

The power inflow transformer according to the present invention configured as described above is characterized in that two or more insulating paper having different properties are used for the windings 140 in the transformer main body 120 to be insulated.

3 is a perspective view schematically showing a winding insulation structure of a transformer according to a first embodiment of the present invention.

3, the winding 140 of the transformer according to the first embodiment of the present invention includes a first insulating paper 142a wound around the conductor 141 and a second insulating paper 142b wound around the first insulating paper 142a. And a third insulating paper 142c around the second insulating paper 142b and the second insulating paper 142b.

At this time, the first insulating paper 142a may be made of an insulating paper having high heat resistance, which is in direct contact with the conductor 141 which generates a lot of heat.

The first insulating paper 142a may be an aramid insulating paper.

Aramid is a light, super heat resistant polyamide synthetic fiber.

The second insulating paper 142b may be formed of an insulating paper having high heat resistance and high dielectric strength.

The third insulating paper 142c may be made of insulating paper having high tensile strength.

The third insulating paper 142c may be a cellulose insulating paper.

After the first insulating paper 142a having a high heat resistance and coming in direct contact with the conductor 141 is wound to a predetermined thickness, the second insulating paper 142b having high heat resistance and high electric insulation strength and the third insulating paper 142c having high tensile strength are sequentially It is possible to improve the tensile force of the winding and affect the electric field formation of the insulating paper, thereby alleviating the electric field concentration.

The first, second, and third insulating sheets 142a, 142b, and 142c may be wound to a predetermined thickness, and the number of times of winding is not limited to a specific number. Therefore, the number of times of winding can be one or more, and can be freely wound according to the purpose required.

Also, the first, second, and third insulating paper 142a, 142b, and 142c can be wound with different thicknesses.

The first, second, and third insulating sheets 142a, 142b, and 142c have a constant width in a longitudinal direction of the conductor 141 and can be wound in an oblique direction.

At this time, the first, second, and third insulating paper 142a, 142b, and 142c may be wound in oblique directions so that predetermined widths overlap each other.

4 is a perspective view schematically showing a winding insulation structure of a transformer according to a second embodiment of the present invention.

4, the winding 240 of the transformer according to the second embodiment of the present invention includes a first insulating paper 242a wound around the conductor 241 and a second insulating paper 242b wound around the first insulating paper 242a, An insulating paper 242b and a third insulating paper 242c.

At this time, the first insulating paper 242a may be made of an insulating paper having high heat resistance, which is in direct contact with the conductor 241, which generates much heat, as in the first embodiment.

The second insulating paper 242b may be formed of an insulating paper having high heat resistance and high dielectric strength.

The third insulating paper 242c may be made of an insulating paper having a strong tensile force.

After the first insulating paper 242a having a high heat resistance and directly touching the conductor 241 is wound to a predetermined thickness as described above, the second insulating paper 242b having high heat resistance and high dielectric strength and the third insulating paper 242c having high tensile strength are used It is possible to improve the tensile force and to affect the electric field of the insulating paper to reduce the concentration of the electric field.

The first, second, and third insulating sheets 242a, 242b, and 242c may each be wound to a predetermined thickness, and the number of times of winding is not limited to a specific number of times. Therefore, the number of times of winding can be one or more, and can be freely wound according to the purpose required.

In addition, the first, second, and third insulating sheets 242a, 242b, and 242c can be wound to have different thicknesses.

The first, second, and third insulating sheets 242a, 242b, and 242c have a constant width in the longitudinal direction of the conductor 241 and can be wound in an oblique direction.

At this time, the first, second, and third insulating sheets 242a, 242b, and 242c may be wound in oblique directions so that predetermined widths overlap each other.

On the other hand, when the insulating paper is wrapped, the overlapping portion between the insulating paper can be wound so as to be gradually thickened to a constant width as the insulating paper is moved away from the portion close to the conductor, and will be described with reference to the third and fourth embodiments of the present invention.

5 is a perspective view schematically showing a winding insulation structure of a transformer according to a third embodiment of the present invention.

5 shows a state in which a part of the second insulation paper is exposed by cutting a part of the winding of the transformer for convenience of explanation.

5, a winding 340 of a transformer according to a third embodiment of the present invention includes a first insulating sheet 342a wound around a conductor 341 and a second insulating sheet 342b wound around the first insulating sheet 342a. And a third insulating paper 342c wound around the second insulating paper 342b and the second insulating paper 342b.

At this time, the first insulating paper 342a may be made of an insulating paper having high heat resistance, which is in direct contact with the conductor 341, which generates a lot of heat, as in the first and second embodiments.

The second insulating paper 342b may be formed of an insulating paper having high heat resistance and high dielectric strength.

The third insulating paper 342c may be made of an insulating paper having a strong tensile force.

After the first insulating paper 342a which has a high heat resistance and comes in direct contact with the conductor 341 is wound to a predetermined thickness, the second insulating paper 342b having a high heat resistance and the high dielectric strength and the third insulating paper 342c having a strong tensile force are sequentially It is possible to improve the tensile force of the winding and affect the electric field formation of the insulating paper, thereby alleviating the electric field concentration.

The first, second, and third insulating sheets 342a, 342b, and 342c may be wound to a predetermined thickness, and the number of times of winding is not limited to a specific number of times. Therefore, the number of times of winding can be one or more, and can be freely wound according to the purpose required.

In addition, the first, second, and third insulating sheets 342a, 342b, and 342c can be wound to have different thicknesses.

The first, second, and third insulating sheets 342a, 342b, and 342c have a constant width in the longitudinal direction of the conductor 341 and can be wound in an oblique direction.

At this time, the first, second, and third insulating sheets 342a, 342b, and 342c may be wound in oblique directions so that predetermined widths (a, b) overlap each other.

The portions of the first, second, and third insulating sheets 342a, 342b, and 342c overlapping with the first, second, and third insulating sheets 342a, 342b, and 342c as they are away from the portion near the conductor 341 It can be wound to become thicker to a certain width.

6 is a perspective view schematically showing a winding insulation structure of a transformer according to a fourth embodiment of the present invention.

6 illustrates a state where a part of the first insulating paper is exposed by cutting a part of the winding of the transformer for convenience of explanation.

6, the winding 440 of the transformer according to the fourth embodiment of the present invention includes a first insulating paper 442a wound around the conductor 441 and a second insulating paper 442b wound around the first insulating paper 442a. An insulating paper 442b and a third insulating paper 442c.

At this time, the first insulating paper 442a may be made of insulating paper having high heat resistance, which is in direct contact with the conductor 441, which generates a lot of heat, as in the first, second, and third embodiments.

In addition, the second insulating paper 442b may be formed of an insulating paper having high heat resistance and high dielectric strength.

The third insulating paper 442c may be made of an insulating paper having a strong tensile force.

After the first insulating paper 442a which has a high heat resistance and comes in direct contact with the conductor 441 as described above is wound to a predetermined thickness, the second insulating paper 442b having high heat resistance and high dielectric strength and the third insulating paper 442c having high tensile strength are used It is possible to improve the tensile force and to affect the electric field of the insulating paper to reduce the concentration of the electric field.

The first, second, and third insulating sheets 442a, 442b, and 442c may each be wound to a predetermined thickness, and the number of times of winding is not limited to a specific number of times. Therefore, the number of times of winding can be one or more, and can be freely wound according to the purpose required.

In addition, the first, second, and third insulating paper 442a, 442b, and 442c can be wound with different thicknesses.

The first, second, and third insulating sheets 442a, 442b, and 442c have a constant width in the longitudinal direction of the conductor 441 and can be wound in an oblique direction.

At this time, the first, second, and third insulating sheets 442a, 442b, and 442c may be wound in oblique directions so that predetermined widths (a, b) overlap each other.

In addition, substantially the same as in the third embodiment described above, the portion overlapping between the first, second, and third insulating paper 442a, 442b, and 442c is gradually thickened to a constant width as it is farther from the portion near the conductor 441 You can wrap it.

In the above description, the winding insulation structure of the transformer is formed of three insulating sheets. However, the present invention is not limited thereto.

The winding insulation structure of the transformer according to the present invention having such characteristics is expected to be utilized for designing winding insulation of a transmission transformer, a distribution transformer, and a power transformer.

While a great many are described in the foregoing description, it should be construed as an example of preferred embodiments rather than limiting the scope of the invention. Therefore, the invention should not be construed as limited to the embodiments described, but should be determined by equivalents to the appended claims and the claims.

140, 240, 340, 440: Windings 141, 241, 341,
142a, 242a, 342a, 442a:
142b, 242b, 342b, 442b:
142c, 242c, 342c, and 442c:

Claims (5)

Conductor;
A first insulating paper wound around the conductor; And
And a second insulating paper and a third insulating paper that sequentially or alternately wind the circumference of the first insulating paper,
Wherein the first insulating paper is made of an insulating paper having a relatively high heat resistance relative to the second and third insulating paper,
Wherein the third insulating paper comprises insulating paper having a relatively high tensile force with respect to the first insulating paper and the second insulating paper. The winding insulation structure of a transformer according to claim 1, wherein the second insulating paper is formed of an insulating paper having an intermediate heat resistance and a tensile force relatively to the first and third insulating paper. The winding insulation structure of a transformer according to claim 1, wherein the first, second, and third insulating paper have a constant width with respect to a longitudinal direction of the conductor and are wound in an oblique direction. 4. The winding insulation structure of a transformer according to claim 3, wherein the first, second, and third insulating paper are wound in an oblique direction so as to overlap a predetermined width. [5] The apparatus of claim 4, wherein the first, second, and third insulating sheets are wound so that the overlapping portion between the first, second, and third insulating sheets becomes gradually thicker as the distance from the portion closer to the conductors increases Wherein the insulation structure of the transformer is characterized by:

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