KR101942374B1

KR101942374B1 - Transformer

Info

Publication number: KR101942374B1
Application number: KR1020150059988A
Authority: KR
Inventors: 이경훈; 김홍만; 이곤; 강구봉
Original assignee: 현대일렉트릭앤에너지시스템(주)
Priority date: 2015-04-28
Filing date: 2015-04-28
Publication date: 2019-01-29
Also published as: KR20160128544A

Abstract

A transformer in which an electric field at a winding end portion is relaxed is disclosed.
The disclosed transformer includes a first winding; A second winding spaced apart from the first winding and provided on the outer side or the inner side of the first winding; A first main static electricity ring provided so as to cover upper and lower edges of the first winding; A second main static electricity ring provided so as to cover upper and lower edges of the second winding; And a second main winding ring provided above the second main winding ring provided at the upper edge of the second winding and below the second main winding ring provided at the lower edge of the second winding, Ring.
According to such a transformer, the electric field at the end portion of the winding is alleviated, the insulating distance between the parts can be reduced while ensuring the insulation safety, and the effect of miniaturizing the device can be obtained.

Description

Transformer {TRANSFORMER}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transformer, and more particularly, to a transformer in which an electric field at a winding end is relaxed.

Generally, a transformer has an iron core and two or more windings, receives AC power from one or two or more circuits, modifies the voltage and current by an electromagnetic induction action, And supplies AC power of the same frequency to more than two circuits.

Such a transformer has a structure in which a low-voltage winding and a high-voltage winding are wound around a leg portion of an iron core in which a plurality of thin plates are laminated as a magnetic material.

Here, an electric field is concentrated at the corner of the winding. In order to alleviate such electric field concentration, an electrostatic ring is provided at the upper and lower portions of the winding or at the center of the winding.

However, the conventional transformer has a disadvantage in that it can not be designed and manufactured with a large radius of curvature of the electrostatic ring because the width of the winding is narrow.

In other words, in order to increase the radius of curvature of the electrostatic ring, the width of the electrostatic ring must be increased. When the electrostatic ring is wider than the winding, the electrostatic ring can not stably support the winding in the vertical direction. A problem may arise in which a part of the winding is released.

Therefore, the electrostatic ring needs to be made so that its width is smaller than or equal to the width of the windings.

Further, in the transformer according to the related art, when a height difference is generated between the windings, the electric field is concentrated on one winding to increase the insulation separation distance between the windings, resulting in a disadvantage that the volume of the entire transformer increases.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a transformer in which an electric field formed at an end of a winding is alleviated and an insulation distance between components can be reduced do.

According to one aspect of the present invention for achieving at least part of the above objects, A second winding spaced apart from the first winding and provided on the outer side or the inner side of the first winding; A first main static electricity ring provided so as to cover upper and lower edges of the first winding; A second main static electricity ring provided so as to cover upper and lower edges of the second winding; And a second main winding ring provided above the second main winding ring provided at the upper edge of the second winding and below the second main winding ring provided at the lower edge of the second winding, And a ring.

In one embodiment, the second winding may be configured such that the top edge is lower than the top of the first winding and the bottom edge is higher than the bottom of the first winding.

Further, in one embodiment, the auxiliary electrostatic ring may have a curvature radius of the outer circumference of the vertical section larger than a radius of curvature of the outer circumference of the vertical section of the first and second main static arms.

Also, in one embodiment, the auxiliary electrostatic ring may have a larger radius of curvature than an edge of the outer circumference of the vertical cross section opposite to the edge facing the first main static ring.

According to an embodiment of the present invention having such a configuration, the electric field at the winding end portion is relaxed, so that the insulation distance between the parts can be reduced while securing insulation safety, and the device can be miniaturized.

1 is a side cross-sectional view of a winding part included in a transformer according to an embodiment of the present invention;
2 is a side cross-sectional view of a winding portion included in a transformer according to another embodiment of the present invention.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Furthermore, the singular forms "a", "an," and "the" include plural referents unless the context clearly dictates otherwise.

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

First, a transformer according to an embodiment of the present invention will be described with reference to FIG.

1, a transformer 100 according to an embodiment of the present invention includes a first winding 110, a second winding 120, a barrier 130, a first main winding ring 140, A two main static ring 150 and an auxiliary static ring 160.

The first winding 110 may be provided to surround an outer periphery of an iron core (not shown).

In one embodiment, the primary winding 110 may be comprised of a high voltage winding or a low voltage winding.

The second winding 120 may be spaced apart from the first winding 110 and may be provided on the outer side or the inner side of the first winding 110.

In one embodiment, the secondary winding 120 may be comprised of a low-voltage winding, a high-voltage winding, or a tap winding.

For example, when the first winding 110 is a high-voltage winding, the second winding 120 may be composed of a low-voltage winding, and when the first winding 110 is a low-voltage winding, the second winding 120 is a high- A winding or a tap winding.

In the embodiment shown in FIGS. 1 and 2, the second winding 120 is provided on the outer side of the first winding 110 to surround the first winding 110, but is not limited thereto, The first winding 110 may be provided so as to surround the outer side of the second winding 120.

The barrier 130 may be disposed at an interval between the first winding 110 and the second winding 120 to insulate the first winding 110 and the second winding 120 from each other. As shown in FIG. 1, the barrier 130 may be disposed at a plurality of intervals in the interval between the first winding 110 and the second winding 120, but the present invention is not limited thereto.

The first main electrostatic ring 140 may be a ring-shaped member provided to cover the upper and lower corners of the first winding 110.

The first main electrostatic ring 140 may be formed in a curved shape in the corner portion of the vertical cross section to prevent the electric field from concentrating on the end portion of the first winding 110.

In one example, the first main electrostatic ring 140 is comprised of an insulator and may include, but is not limited to, a metallic shell surrounding the surface of the insulator.

The second main electrostatic ring 150 may be formed of a ring-shaped member having the upper and lower portions of the second winding 120 so as to cover the corners.

The second main electrostatic ring 150 can prevent the electric field from concentrating on the end portion of the second winding 120.

In one embodiment, the second main electrostatic ring 150 is configured such that the width is narrower than or equal to the width of the second winding 120, as shown in FIG.

The second main electrostatic ring 150 having a width smaller than the width of the second winding 120 is wound around the second winding 120 so that the second winding 120 wound in a laminated form is not shifted or separated in the horizontal direction, Can be stably supported in the vertical direction.

In one embodiment, the second main electrostatic ring 150 may be formed such that the peripheral edge portion of the vertical section has a curved shape for electric field relaxation.

For example, the second main electrostatic ring 150 may be comprised of an insulator in the same manner as the first main electrostatic ring 140, and may include a metal sheath surrounding the surface of the insulator, but is not limited thereto.

The auxiliary electrostatic ring 160 is disposed above the second main electrostatic ring 150 provided at the upper edge of the second winding 120 and the second main static electricity ring 150 provided at the lower edge of the second winding 120 150 to cover the second main electrostatic ring 150.

That is, the auxiliary electrostatic ring 160 is disposed above the second main electrostatic ring 150 provided at the upper end of the second winding 120, and the second main static electricity ring 160 provided at the lower end of the second winding 120, (Not shown).

1, in one embodiment, the auxiliary electrostatic ring 160 may be configured to have a width that is greater than the width of the second winding 120. As shown in FIG. As a result, the auxiliary electrostatic ring 160 can be configured to have a wider width than the second main electrostatic ring 150.

As such, the auxiliary electrostatic ring 160, which is wider than the second main electrostatic ring 150, is formed such that the corner portion of the vertical cross section has a larger radius of curvature than the edge portion of the vertical cross section of the second main static ring 150 .

In other words, there is a limit to the radius of curvature that can be applied to the edge portion of the vertical section, because the second main electrostatic ring 150 has a limit that the width must be smaller than the width of the second winding 120. [

Therefore, the auxiliary electrostatic ring 160, which is wider than the second main electrostatic ring 150, has a wide horizontal plane and a long vertical plane, so that the corner portion of the vertical cross-section can be curved with a large radius of curvature

As described above, the electric field concentration is relieved in the portion where the curvature is formed with a large radius of curvature. Therefore, the auxiliary electrostatic ring 160 has an advantage that the field relaxation performance is superior to that of the second main electrostatic ring 150.

On the other hand, in one embodiment, the secondary winding 120 may be configured such that its top end is lower than the top end of the primary winding 110. That is, the first winding 110 may protrude in a direction perpendicular to the second winding 120.

Conversely, the lower end of the secondary winding 120 may be configured to be higher than the lower end of the primary winding 110. That is, the lower end of the first winding 110 may protrude downward from the lower end of the second winding 120.

Thus, the first main electrostatic ring 140 can be disposed at a position protruding more vertically than the second main electrostatic ring 150.

At this time, the auxiliary electrostatic ring 160 may be formed in a shape elongated in the vertical direction so that the height of the vertical direction end is equal to the height of the vertical direction end of the first main static ring 140, but is not limited thereto .

That is, the auxiliary electrostatic ring 160 disposed above the second winding 120 may be configured to extend upwardly and the auxiliary electrostatic ring 160 disposed below the second winding 120 And may be configured to extend downwardly.

As described above, the auxiliary electrostatic ring 160 has the same height of the electric field concentration region on the side of the second winding 120 and the side of the field concentration region on the side of the first winding 110, so that the electric field is excessively concentrated It is possible to reduce the electric field of the winding portion.

Next, a transformer 100 according to another embodiment of the present invention will be described with reference to FIG.

2, the transformer 100 according to another embodiment of the present invention includes the auxiliary electrostatic ring 160-1 and the outer peripheral edge of the vertical cross section of the auxiliary electrostatic ring 160-1, Can be formed with a larger radius of curvature than the outer peripheral edge portion of the vertical section of the two-week electrostatic ring (150).

To this end, in an alternate embodiment, the auxiliary electrostatic ring 160-1 may include a second main electrostatic ring 160-1 as well as the auxiliary electrostatic ring 160 included in the transformer 100 according to one embodiment of the present invention shown in FIG. The width of the ring 150 is preferably larger than the width of the ring 150.

On the other hand, in another embodiment, the auxiliary electrostatic ring 160-1 is provided on the side (the upper left side in the drawing) of the outer circumference of the vertical cross section facing the first main static ring 140 The radius of curvature may be larger than the other edges.

The electric field is more concentrated at the end portion of the auxiliary electrostatic ring 160-1 opposite to the first main electrostatic ring 140 than in the other portions. As in the other embodiment of the present invention, the auxiliary electrostatic ring 160- 1, the effect of alleviating the electric field can be obtained in the case where the corner opposite to the first main electrostatic ring 140 is curved with a large radius of curvature in the outer periphery of the vertical section of the vertical section.

While the present invention has been particularly shown and described with reference to particular embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention as defined by the following claims I would like to make it clear.

100: Transformer
110: 1st winding
120: Secondary winding
130: Barrier
140: 1st main static ring
150: 2nd main static ring
160, 160-1: auxiliary static ring

Claims

A first winding;
A second winding spaced apart from the first winding and provided on the outer side or the inner side of the first winding;
A first main static electricity ring provided so as to cover upper and lower edges of the first winding;
A second main static electricity ring provided so as to cover upper and lower edges of the second winding; And
An auxiliary static electricity ring provided above the second main static electricity ring provided at the upper edge of the second winding and below the second main static electricity ring provided at the lower edge of the second secondary winding, ;
&Lt; / RTI >

The method according to claim 1,
Wherein the second winding has an upper end edge lower than an upper end of the first winding and a lower end edge higher than a lower end of the first winding.

The method according to claim 1,
Wherein the auxiliary electrostatic ring has a curvature radius at the outer periphery of the vertical section larger than a radius of curvature at the outer periphery of the vertical section of the first and second main electrostatic rings.

The method of claim 3,
Wherein the auxiliary electrostatic ring has a radius of curvature larger than an edge at a corner opposite to the first main positive ring ring in an outer periphery of a vertical cross section.