KR20220065168A - Electrodes for mitigating the electric field of vacuum interrupters - Google Patents

Abstract

The present invention relates to an electrode, and more particularly, to an electrode used for a vacuum interrupter so as to provide an electrode capable of alleviating electric field concentration in a vacuum interrupter. The electrode for electric field relaxation of a vacuum interrupter according to a preferred embodiment of the present invention includes a contact stand (310); a reinforcement stand (320); and a contact point (330), wherein a first round surface (313) is provided at an outer periphery of an upper surface (311) of the contact stand (310), and a second round surface (332b) is provided at a side surface (332) of the contact point (330). According to the present invention, the round surface is maximized by the first round surface and the second round surface. Accordingly, the electric field concentration in a vacuum interrupter is alleviated.

Description

Electrodes for mitigating the electric field of vacuum interrupters

The present invention relates to an electrode, and to an electrode used in a vacuum interrupter.

A vacuum circuit breaker (VCB) uses vacuum as an insulating medium to quickly and automatically cut off fault currents to protect the power system and major devices in the system. The part that performs the function of making and breaking current in a vacuum circuit breaker is called a vacuum interrupter (VI).

A fixed electrode and a movable electrode are provided inside the vacuum interrupter. During the closing operation of the vacuum interrupter, the movable electrode is in close contact with the fixed electrode. In the interruption operation of the vacuum interrupter, the movable electrode is spaced apart from the fixed electrode.

Referring to FIG. 1 , in the conventional vacuum circuit breaker, the electrode has a structure in which the contact 20 is seated on the upper surface of the contact table 10 . At this time, the outer peripheral surface 21 of the contact 20 coincides with the outer peripheral surface 11 of the contact table 10 . The electrode 1 of FIG. 1 has a structure applied to both a fixed electrode and a movable electrode.

The upper outer region (region A in FIG. 1 ) of the contact point 20 has an outwardly convex round surface. When the outer area of the contact 20 does not have a round surface like area A of FIG. 1 , the electric field is concentrated on the outer peripheral surface 21 of the contact point. This is because the upper end of the outer circumferential surface 21 of the contact has an edged region. Accordingly, the arc is more strongly generated during the blocking operation. And, the arc may be concentrated in the upper region of the outer peripheral surface 21 of the contact point. In addition, damage to the contact may be severe due to the arc concentrated on the upper outer peripheral surface 21 of the contact.

Therefore, in order to reduce the electric field propagation phenomenon in the cornering area, it is preferable that the upper outer area of the contact point 20 has a round surface as shown in FIG. 1 .

However, as the round surface of region A increases, the electric field value decreases, but there is a limit to the value.

This is because chromium copper (CuCr), not copper, is used as the contact material of the vacuum interrupter, and it is not possible to design thickly because chromium copper has a higher resistance than general copper. In addition, since the chromium copper material is manufactured by sintering or arc melting, it is difficult to increase the thickness indefinitely in terms of uniformity and cost of the material.

Therefore, the conventional contact structure has a limit in reducing the electric field outside the upper portion of the contact point.

1. Korean Patent Publication No. 10-2020-0119015 (published date: 2020.10.19.) 2. Korea Patent Publication No. 10-2016-0029771 (published on March 15, 2016)

An object of the present invention is to provide an electrode in which the electric field concentration phenomenon in a vacuum interrupter can be alleviated.

An electrode for electric field relaxation of a vacuum interrupter according to a preferred embodiment of the present invention includes a contact band 310; reinforcing bar 320; and a contact point 330 , a first round surface 313 is provided outside the upper surface 311 of the contact table 310 , and a second round surface is provided on the side surface 332 of the contact point 330 . (332b) is characterized in that it is provided.

Here, the first round surface 313 and the second round surface 332b may be connected to each other.

In the present invention, the round surface can be maximized by the first round surface and the second round surface. Thereby, the electric field concentration phenomenon in the vacuum interrupter can be alleviated.

1 is a cross-sectional view of an electrode for a vacuum interrupter according to the prior art.
2 is a cross-sectional view of a vacuum interrupter to which an electrode of the present invention is applied.
3 is a cross-sectional view of the electrode of FIG. 2 .
4 is an exploded view of the electrode of FIG. 2 .
FIG. 5 is an enlarged view of area B of FIG. 3 .

Since the present invention can have various changes and can have various embodiments, specific embodiments are illustrated in the drawings and described in detail in the detailed description. However, this is not intended to limit the present invention to specific embodiments, it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention.

In describing each figure, like reference numerals have been used for like elements. In describing the present invention, if it is determined that a detailed description of a related known technology may obscure the gist of the present invention, the detailed description thereof will be omitted.

Terms such as first, second, etc. may be used to describe various elements, but the elements should not be limited by the terms. The above terms are used only for the purpose of distinguishing one component from another.

For example, without departing from the scope of the present invention, a first component may be referred to as a second component, and similarly, a second component may also be referred to as a first component.

and/or includes a combination of a plurality of related listed items or any of a plurality of related listed items.

The terms used in the present application are only used to describe specific embodiments, and are not intended to limit the present invention.

The singular expression includes the plural expression unless the context clearly dictates otherwise. In the present application, terms such as “comprise” or “have” are intended to designate that a feature, number, step, operation, component, part, or combination thereof described in the specification exists, but one or more other features It should be understood that this does not preclude the existence or addition of numbers, steps, operations, components, parts, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

Terms such as those defined in a commonly used dictionary should be interpreted as having a meaning consistent with the meaning in the context of the related art, and should not be interpreted in an ideal or excessively formal meaning unless explicitly defined in the present application. does not

Hereinafter, an electrode for field relaxation of a vacuum interrupter according to a preferred embodiment of the present invention will be described with reference to FIGS. 2 to 5 .

Referring to FIG. 2 , the vacuum interrupter may include a body 111 , an upper flange 112 , and a lower flange 113 . The body 111 may be a hollow cylinder with both sides open. The body 111 may be formed of an insulating material (eg, ceramic). The upper portion of the body 111 may be airtight maintained by the upper flange 112 , and the lower portion of the body 111 may be airtight maintained by the lower flange 113 . A main shield 111a extending upward and downward may be installed inside the center of the main body 111 based on the longitudinal direction of the main body 111 . The main shield 111a may prevent an arc generated in the blocking operation from entering the main body 111 .

An upper sub-shield 112a may be installed under the upper flange 112 . The upper sub-shield 112a may block an arc from entering a region in which the upper flange 112 and the body 111 contact each other. The lower sub-shield 113a may be installed on the lower flange 113 . The lower sub-shield 113a may block the arc from entering the area in which the lower flange 113 and the body 111 contact each other.

The fixed terminal 121 may be installed through the upper flange 112 . The fixed terminal 121 may be electrically connected to the outside with a conductor. The fixed electrode 400 may be installed at the lower end of the fixed terminal 121 .

The movable terminal 122 may be installed through the lower flange 113 . The movable terminal 122 can move up and down by a manipulator (not shown) and perform blocking and input operations. The movable electrode 300 may be installed on the upper end of the movable terminal 122 .

A bellows 141 may be installed on the side of the movable terminal 112 . The upper portion of the bellows 141 may be fixed to the side of the movable terminal 122 , and the lower portion of the bellows 141 may be connected to the upper surface of the lower flange 113 . The bellows 141 may be formed as a corrugated tube and may be stretched during the input operation and contracted during the blocking operation. The bellows 141 may support the vertical movement of the movable terminal 112 while maintaining airtightness between the inside and the outside of the main body 111 . A bellows shield 141a may be provided on the side of the bellows 141 . The upper portion of the bellows shield 141a may be fixed to the movable terminal 122 at the upper portion of the bellows 141 . The bellows shield 141a may receive the bellows 141 inside while extending downward.

Hereinafter, the structures of the electrodes 300 and 400 will be described with reference to FIGS. 3 to 5 . The electrode structure of FIGS. 3 to 5 may be common to the fixed electrode 400 and the movable electrode 300 . For convenience of description, the movable electrode 300 will be described as a reference.

The electrode 300 may include a contact bar 310 , a reinforcing bar 320 , and a contact point 330 .

The contact table 310 may have a cylindrical cup shape with an open top. The contact table 310 may have a first accommodating space S1 therein. A reinforcing bar 320 may be installed in the first accommodating space S1. The reinforcing bar 320 may be a hollow cylinder with both sides open. The upper end of the reinforcing bar 32 may be located on the same plane as the contact bar upper surface 311 to be described later.

The upper surface 311 of the contact table 310 may be formed as a horizontal surface. The outer periphery of the upper surface of the contact table 311 may have a region protruding upward. The outer side of the protruding area outside the upper surface 311 may be the first round surface 313 , and the inner side of the protruding area outside the upper surface 311 may be the partition wall 312 .

The first round surface 313 may extend from the outermost portion of the upper surface 311 to the inner upper portion. The first round surface 313 may have an outwardly convex shape.

The partition wall 312 may extend directly downward from the upper end of the first round surface 313 . The partition wall 312 may extend to the upper surface 311 of the contact table. The partition wall 312 and the contact table upper surface 311 may form a second accommodating space S2.

The contact point 330 may have a disk shape. The contact lower surface 331 may be seated on the contact table upper surface 311 .

The side surface 332 of the contact point 330 may include an insertion surface 332a and a second round surface 332b.

The insertion surface 332a may extend directly upward from the outermost portion of the contact point 330 . The insertion surface 332a may be fixed in close contact with the partition wall 312 . The upper end of the insertion surface 332a may coincide with the upper end of the partition wall 312 or may be located below the upper end of the partition wall 312 .

The second round surface 332b may extend from an upper end of the insertion surface 332a to an inner upper portion. The second round surface 332b may have an outwardly convex shape. The second round surface 332b has a gently curved surface and may gently extend to the contact upper surface 333 .

The first round surface 313 may have a smaller radius of curvature than the second round surface 332b. In FIG. 5 , R1 may be a radius of curvature of the first round surface 313 , and R2 may be a radius of curvature of the second round surface 332b. The first round surface 313 and the second round surface 332b may be connected to each other. The curved surface extending from the side of the contact stand 310 and the side of the contact 330 to the first round surface 313 and the second round surface 332b may prevent the electric field from being concentrated through the smooth curved surface. Further, by maximizing the length of the curved surface through the curved surface connected to the first round surface 313 and the second round surface 332b, the electric field concentration phenomenon can be reduced to the maximum. In other words, by removing the edge portion from the side of the contact stand 310 and the side of the contact 330 , the electric field concentration phenomenon can be reduced to the maximum. During the blocking operation, the electric field between the fixed electrode and the movable electrode may be concentrated on the first round surface 313 having a smaller radius of curvature than the second round surface 332b. Thereby, it is possible to prevent the arc aligned by the electric field from being concentrated in the outer region of the contact point 330 and to prevent the contact point 330 from being damaged by the arc. In addition, during the blocking operation, the electric field is concentrated on the first round surface 313 having a smaller radius of curvature than the second round surface 332b , so that the arc may be distributed to the outside of the contact point 330 .

In addition, when assembling the contact point 330 , since the contact point 330 is centered by the barrier rib 312 , it may be very easy to assemble the contact point 330 to the contact table 310 .

10: contact bar
11: outer circumferential surface of the contact table
20: contact
21: contact outer circumferential surface
111: body
111a: main shield
112: upper flange
112a: upper sub-shield
113: lower flange
113a: lower sub-shield
121: fixed terminal
122: movable terminal
141: bellows
141a: Bellows Shield
300: movable electrode
310: contact
S1: first accommodation space
311: upper surface of the contact table
312: bulkhead
313: 1st round face
320: reinforcing bar
321: upper surface of reinforcing bar
S2: second accommodation space
330: contact
331: contact bottom surface
332: side of contact
332a: insertion side
332b: 2nd round face
333: contact top surface
R1: radius of curvature of the first round face
R2: radius of curvature of the second round face
400: fixed electrode
A: Area A
B: Area B

Claims (2)

contact table 310;
reinforcing bar 320; and
a contact point 330;
A first round surface 313 is provided on the periphery of the upper surface 311 of the contact table 310,
An electrode for electric field relaxation of a vacuum interrupter, characterized in that a second round surface (332b) is provided on a side surface (332) of the contact point (330). The first round surface (313) and the second round surface (332b) is an electrode for electric field relaxation of a vacuum interrupter, characterized in that connected to each other.

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