KR20170065077A - Core and transformer using the same - Google Patents

Abstract

An iron core according to an embodiment of the present invention includes an upper yoke, a lower yoke, a lower yoke, and a lower yoke. A lower yoke disposed in parallel with the upper yoke, a plurality of legs connecting the upper yoke and the lower yoke, and an insulating layer formed on a surface where the legs are mutually coupled with the upper yoke and the lower yoke have. Thereby minimizing the problem caused by the axial induced current.

Description

TECHNICAL FIELD [0001] The present invention relates to an iron core and a transformer having the iron core.

The present invention relates to an iron core capable of minimizing heat generation by interrupting a flow of an induction current generated in an iron core of a transformer, and a transformer having the iron core.

A transformer is a transformer that changes the magnitude of AC voltage and current using electromagnetic induction.

Transformers are widely used from small electronic devices to large substation or transmission facilities. Particularly, in a large-sized power transmission facility or a transmission facility, an ultra-high-voltage large-capacity transformer is mainly used.

Generally, a transformer is formed by a structure in which a plurality of windings are wound around a common iron core, in which power is input to one winding and then power is output to the other winding.

Also, in the case of a power transformer, components such as a clamp and a tap changer may be included to fix and support the winding or the iron core. In addition, insulating oil is used as insulation medium to ensure the insulation between the parts, and it is placed in the enclosure and protected from external environment.

FIG. 1 is a perspective view schematically showing an iron core of a transformer according to the related art, and FIG. 2 is an enlarged view of a part enlarged view of a portion A of FIG.

1 and 2, an iron core 20 of a transformer according to the related art includes an upper yoke 50, a lower yoke 51, and legs 52 and 53, Steel plates are stacked and formed.

In the conventional case, as shown in FIG. 2, when the portion where the electrical steel sheet comes in contact is enlarged, irregular intervals are formed in the portion where the leg 53 and the yoke 50 are connected.

Accordingly, the flow (arrow) of the axial currents generated in the iron core due to the magnetic field unbalance distribution during the operation of the transformer is concentrated in a relatively narrow space, and the heat is concentrated at the corresponding portion.

In addition, when a potential difference is generated between the above-described intervals, micro-discharge or the like is induced, thereby inducing chemical decomposition of the insulating oil filling the inside of the transformer.

An object of the present invention is to provide an iron core and a transformer having the same that can minimize the occurrence of micro discharge between the iron cores or the occurrence of local heat generation.

According to an embodiment of the present invention, an iron core for a transformer includes an upper yoke, a lower yoke disposed below the upper yoke in parallel with the upper yoke, a plurality of legs connecting the upper yoke and the lower yoke, And an insulating layer formed on a surface mutually coupled with the upper yoke and the lower yoke.

In the present embodiment, the insulating layer may be formed on the leg, the upper yoke, and the lower yoke, respectively.

In this embodiment, the insulating layer may have heat resistance and electrical insulation.

In the present embodiment, the legs, the upper yoke, and the lower yoke may be electrically insulated from each other by the insulating layer.

Further, the transformer according to the embodiment of the present invention may include an iron core, a coil wound around the iron core, and an enclosure accommodating the iron core wound with the coil.

According to an embodiment of the present invention having such a configuration, it is possible to solve the problem that the heat is concentrated on a specific region due to the flow of the axial flow, or the micro discharge occurs.

Further, since the micro discharge is suppressed, the chemical change of the insulating oil can be minimized, and gas generation in the transformer can be minimized. Therefore, the stability of the transformer can be improved.

1 is a perspective view schematically showing an iron core of a transformer according to the prior art;
Fig. 2 is a partially enlarged view of a portion A in Fig. 1; Fig.
3 is a schematic diagram showing the construction of a transformer according to an embodiment of the present invention.
4 is an exploded view schematically showing an iron core of the transformer shown in Fig.
FIG. 5 is a cross-sectional view of the iron core taken along BB in FIG. 4; FIG.
6 is a partial enlarged view of a part of an iron core according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. However, the embodiments of the present invention can be modified into various other forms, and the scope of the present invention is not limited to the embodiments described below. Further, the embodiments of the present invention are provided to more fully explain the present invention to those skilled in the art. In addition, the shape and size of elements in the figures may be exaggerated for clarity.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 3 is a schematic view showing the construction of a transformer according to an embodiment of the present invention, and FIG. 4 is an exploded view schematically showing an iron core of the transformer shown in FIG. FIG. 5 is a cross-sectional view of the iron core shown in FIG. 4 according to BB, and FIG. 6 is a partially enlarged view of the iron core according to the embodiment of the present invention. Here, FIG. 6 shows a portion corresponding to the enlarged portion in FIG.

3, a transformer 100 according to an embodiment of the present invention may include an enclosure 110, a coil 130, and an iron core 120. As shown in FIG.

The iron core 120 and the windings 130 may be disposed inside the enclosure 110. That is, the enclosure 110 is a member that isolates the iron core 120 and the coil 130 from the outside, and protects the iron core 120 and the coil 130 from the external environment.

Various fluids may be stored in the enclosure 110 according to the type of the transformer 100. For example, in the case of an inflow type transformer, the inside of the enclosure 110 may be filled with insulating oil, and in the case of a dry type transformer, the inside of the enclosure 110 may be filled with air.

The winding 130 may be a wire type or a foil type wire wound on an iron core 120 to be described later, and may include a primary winding and a secondary winding. In this embodiment, the primary winding and the secondary winding are stacked and wound on the main leg 153 of the iron core 120 as an example. However, the configuration of the present invention is not limited thereto, and it is also possible to wind the side legs 152 as necessary.

The iron core 120 is a member that serves as a passage for magnetic force lines. Generally, the iron core 120 is formed in a laminated structure of thin steel sheets to reduce iron loss. In this embodiment, the iron core 120 is a laminated structure of the electric steel plates, and the electric steel plate may be a thin steel plate containing silicon. However, the present invention is not limited thereto.

The iron core 120 includes an upper yoke 150, a lower yoke 151, legs 152 and 153, yoke coupling portions 154 and 155, and leg coupling portions 156 and 157 .

The upper yoke 150 is a member for forming the upper part of the iron core 120, and may be formed in a rod shape and arranged long.

The lower yoke 151 is a member that forms a lower portion of the iron core 120. The lower yoke 151 may be disposed below the upper yoke 150 and parallel to the upper yoke 150. For example, the lower yoke 151 and the upper yoke 150 may be arranged in parallel along the horizontal direction.

The legs 152 and 153 are members vertically disposed between the upper yoke 150 and the lower yoke 151. The legs 152 and 153 may be spaced apart from each other by a predetermined distance between the upper yoke 150 and the lower yoke 151 along a vertical direction.

Specifically, the legs 152 and 153 according to the present embodiment include a main leg 153 disposed at the center and two side legs 152 disposed on both sides of the main leg 153, respectively.

However, the present invention is not limited thereto and various modifications are possible. For example, in the above-described embodiment, the main legs 153 are formed as one unit. However, when the transformers are configured as three-phase or parallel structures, the number of the main legs 153 may be plural.

The yoke engaging portions 154 and 155 are portions where the upper yoke 150 and the lower yoke 151 are engaged with the legs. The yoke engaging portions 154 and 155 may be formed on the upper yoke 150 and the lower yoke 151 in the same number as the legs 152 and 153, respectively.

The leg engagement portions 156 and 157 are formed at both ends of the legs 152 and 153, respectively. The leg coupling portions 156 and 157 are coupled to the yoke coupling portions 154 and 155 of the upper yoke 150 and the lower yoke 151, respectively.

That is, the yoke engaging portions 154 and 155 and the leg engaging portions 156 and 157 face each other and face each other.

Therefore, the yoke engaging portions 154 and 155 and the leg engaging portions 156 and 157 are formed to be able to engage and engage with each other. For example, as shown in FIG. 5, when the leg joints 156 and 157 protrude toward the center, the yoke joints 154 and 155 may be formed in a concave groove toward the center.

An insulating layer is formed on any one of the yoke engaging portions 154 and 155 and the leg engaging portions 156 and 157.

The insulating layer 180 may be formed by applying an insulating paint to the yoke engaging portions 154 and 155 or the leg engaging portions 156 and 157. Here, the insulating paint may be a paint having heat resistance performance that does not cause chemical deformation due to heat generated during normal operation of the transformer.

The legs 152 and 153 and the upper yoke 150 and the lower yoke 151 are electrically insulated from each other by the insulating layer 180. [ Therefore, the axial flow between the legs 152, 153 and the yokes 150, 151 can be blocked.

In this embodiment, the insulating layer 180 is formed on the yoke coupling portions 154 and 155 and the leg coupling portions 156 and 157, respectively. However, the present invention is not limited to this, and it is also possible to form the insulating layer 180 on only one of the yoke coupling portions 154 and 155 and the leg coupling portions 156 and 157.

The iron core according to this embodiment is formed by laminating a pair of electrical steel plates to form the legs 152 and 153 and the yokes 150 and 151 and then joining the yoke engaging parts 154 and 155 and the leg joints The electric insulating layer 180 is formed between the yoke engaging portions 154 and 155 and the leg engaging portions 156 and 157 by applying a paint having electric insulation performance to the portions 156 and 157 of the yoke.

As the insulating layer 180 is formed, the transformer according to the present embodiment can block the axial currents generated by the magnetic field unbalance distribution from flowing from the yoke to the leg side or from the leg to the yoke side (see the arrows in Fig. 6) .

Accordingly, the axial currents are concentrated in a relatively narrow space, and the problem of concentrating the heat on a specific part due to the flow of the axial flow and generating a fine discharge can be solved.

Further, since the micro discharge is suppressed, the chemical change of the insulating oil can be minimized, and gas generation in the transformer can be minimized. Therefore, the stability of the transformer can be improved.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be obvious to those of ordinary skill in the art.

100: Transformer
110: enclosure
120: iron core
130: Winding
150: upper yoke
151: Lower yoke
152: side leg
153: Main leg
180: insulating layer

Claims (5)

Upper yoke;
A lower yoke disposed on the lower side of the upper yoke in parallel with the upper yoke;
A plurality of legs connecting the upper yoke and the lower yoke; And
An insulating layer formed on a surface of the leg where the upper yoke and the lower yoke are coupled;
And a transformer core.
The semiconductor device according to claim 1,
And an iron core formed on the leg, the upper yoke, and the lower yoke, respectively.
The semiconductor device according to claim 1,
And has heat resistance and electrical insulation.
The method according to claim 1,
Wherein the legs, the upper yoke, and the lower yoke are electrically insulated from each other by the insulating layer.
An iron core according to claim 1;
A winding wound around the iron core; And
An enclosure housing the iron core with the winding wound thereon;
And a transformer.

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