JP2013149579A - Vacuum circuit breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vacuum circuit breaker that comprises less components by decreasing kinds of support insulators for supporting and fixing a vacuum valve.SOLUTION: A vacuum circuit breaker includes a vacuum valve 3 having a pair of contacts which freely contact and leave each other, a pair of insulating support plates 20a, 20b which are arranged holding the vacuum valve 3 therebetween, an upper electrode 4 which is fixed to one-side ends of the insulating support plates 20a, 20b and to which a fixation side of the vacuum valve 3 is fixed, a lower electrode 7 which is fixed to intermediate portions of the insulating support plates 20a, 20b and with which a movable shaft 8 of the vacuum valve 3 penetrates to come into contact, a flange 1 which is fixed to other-side ends of the insulating support plates 20a, 20b, and an operation mechanism 14 which is fixed to the flange 1 and arranged along an axis of the vacuum valve 3.

Description

  Embodiments described herein relate generally to a vacuum circuit breaker having an improved support insulator for supporting and fixing a vacuum valve.

  Conventionally, a vacuum circuit breaker used for a gas-insulated switchgear has a main circuit member such as a vacuum valve disposed in an insulating gas, an operation mechanism disposed in the air, and is opened and closed (see, for example, Patent Document 1). ).

  This type of vacuum circuit breaker is divided into a main circuit portion 2a in insulating gas and an operation mechanism portion 2b in the air, with a plate-like flange 1 fixed to the board wall as a boundary.

  The main circuit portion 2a is provided with a vacuum valve 3 having a pair of contactable contacts, and the fixed side is fixed to an elliptical upper electrode 4. The upper electrode 4 is fixed to a cylindrical upper support insulator 5, and the upper support insulator 5 is fixed to a fixing plate 6 fixed to the flange 1. A lower electrode 7 having an L-shaped cross section is provided on the movable side of the vacuum valve 3, and a movable shaft 8 penetrates through the movable shaft 8. The lower electrode 7 is fixed to a rectangular lower support insulator 9, and the lower support insulator 9 is fixed to a fixed plate 6. Between the upper electrode 4 and the lower electrode 7, a pair of plate-shaped interelectrode support plates 10 are provided on the flange 1 side and the opposite flange 1 side. An insulating operation rod 12 is connected to the movable shaft 8 via a Russell mechanism 11 that changes the operation direction. The operation shaft 13 fixed to the insulating operation rod 12 passes through the fixing plate 6 and the flange 1 in an airtight manner, and is connected to an operation mechanism 14 provided in the operation mechanism portion 2b.

  In such a configuration, the vacuum valve 3 is supported and fixed to three types of support insulators, that is, an upper support insulator 5, a lower support insulator 9, and an interelectrode support plate 10. That is, since the upper support insulator 5 and the lower support insulator 9 perform ground-to-ground insulation, and the inter-electrode support plate 10 performs in-phase inter-electrode insulation, the number of supporting insulators is large and the number of parts is increased.

JP 2000-294093 A

  The problem to be solved by the present invention is to provide a compact vacuum circuit breaker by reducing the types of supporting insulators for supporting and fixing the vacuum valve 3 to reduce the number of parts.

  In order to solve the above problems, a vacuum circuit breaker according to an embodiment includes a vacuum valve having a pair of contactable and separable contacts, a pair of insulating support plates disposed so as to sandwich the vacuum valve, and the insulating support An upper electrode fixed to one end of the plate and fixed to the fixed side of the vacuum valve; a lower electrode fixed to an intermediate portion of the insulating support plate; and a movable electrode penetrating through the movable side of the vacuum valve; A flange fixed to the other end of the insulating support plate, and an operation mechanism fixed to the flange and disposed in the axial direction of the vacuum valve.

The side view which shows the structure of the vacuum circuit breaker which concerns on Example 1 of this invention. The front view which shows the structure of the vacuum circuit breaker which concerns on Example 1 of this invention. The front view which shows the structure of the vacuum circuit breaker which concerns on Example 2 of this invention. The perspective view which shows the support insulator of the vacuum circuit breaker which concerns on Example 2 of this invention. The side view which shows the structure of the conventional vacuum circuit breaker.

  Embodiments of the present invention will be described below with reference to the drawings.

  First, a vacuum circuit breaker according to Embodiment 1 of the present invention will be described with reference to FIGS. FIG. 1 is a side view showing the configuration of a vacuum circuit breaker according to Embodiment 1 of the present invention, and FIG. 2 is a front view showing the configuration of the vacuum circuit breaker according to Embodiment 1 of the present invention. In addition, the same code | symbol was attached | subjected to the component similar to the past.

  As shown in FIGS. 1 and 2, the vacuum circuit breaker is divided into a main circuit portion 2a in the insulating gas and an operation mechanism portion 2b in the air with a plate-like flange 1 fixed to the panel wall as a boundary. Configured.

  In the main circuit portion 2a, the axial direction of the vacuum valve 3 having a pair of contacts that can be contacted and separated in the vertical direction with respect to the surface of the flange 1 is disposed. An elliptical upper electrode 4 is fixed to the fixed side of the tip. In the upper electrode 4, the short circle direction forms a phase, and one ends of plate-like support insulating plates 20 a and 20 b are fixed to both ends of the long circle direction, respectively. The other end is fixed to a fixing plate 6 fixed to the flange 1. The supporting insulating plates 20a and 20b are both provided with rectangular openings 21a and 21b in the middle.

  A hemispherical lower electrode 7 is provided at an intermediate portion near the flange 1 between the supporting insulating plates 20a and 20b. The lower electrode 7 has a hemispherical surface facing the flange 1, and a plate-like lower conductor 22 is fixed to the outer periphery. One end of the lower conductor 22 is fixed to the end face of one opening 21a, and the other end is fixed to the end face of the other opening 21b. A contactor 23 is provided at the end of the lower conductor 22.

  In the lower electrode 7, the movable shaft 8 of the vacuum valve 3 is movably penetratingly contacted, and an insulating operation rod 12 is connected. An operation shaft 13 is fixed to the insulating operation rod 12 in the axial direction, penetrates the fixing plate 6 and the flange 1 in an airtight manner, and is connected to an operation mechanism 14 provided in the operation mechanism portion 2b.

  As a result, the support insulating plates 20a and 20b are of a single type and are arranged so as to sandwich the vacuum valve 3. The insulation between the flange 1 and the lower conductor 22 is formed between the lower conductor 22 and the lower conductor 7 including the lower electrode 7. Insulation between the common electrodes is formed between the upper electrode 4 and the upper electrode 4. Here, the curvature radii of the point A of the upper electrode 4 and the point B of the lower electrode 7 are the same. At point A, a gap between the ground and an unshown board wall is formed, and at point B, a gap between the fixed plate 6 and ground is formed, so that the spherical surface having the points A and B and the flat plate face each other. The electric field strength of the gap between the ground is the same. In addition, since the spherical surfaces face each other in the interphase gap, if the gap length is the same, the electric field utilization rate is improved, the electric field strength is lower than the gap between the grounds, and the insulation coordination between the phases> the ground can be achieved. The points A and B have the maximum radius of curvature in forming the interphase gap and the ground-to-ground gap.

  Further, the lower electrode 7 and the lower conductor 22 are integrated, and the openings 21a and 21b are provided to facilitate the mounting and fixing work of the lower electrode 7.

  According to the vacuum circuit breaker of the first embodiment, since the vacuum valve 3 is supported and fixed by the two supporting insulating plates 20a and 20b having the same shape, the supporting insulator becomes one type and the number of parts can be reduced. Therefore, a compact structure can be obtained. Moreover, the casting mold which manufactures the support insulating plates 20a and 20b becomes one kind, and can make manufacturing work easy.

  In the first embodiment, the axial direction of the vacuum valve 3 has been described as being horizontally disposed. However, the operation mechanism 14 may be disposed at the lower portion and the axial direction of the vacuum valve 3 may be vertically disposed.

  Next, a vacuum circuit breaker according to Embodiment 2 of the present invention will be described with reference to FIGS. FIG. 3 is a front view showing the configuration of the vacuum circuit breaker according to the second embodiment of the present invention, and FIG. 4 is a perspective view showing a support insulator of the vacuum circuit breaker according to the second embodiment of the present invention. The second embodiment differs from the first embodiment in that the support insulating plate is integrated into three phases. 3 and 4, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 3, a support insulating plate 24 that supports and fixes the vacuum valve 3 is integrated into a three-phase structure. A U-shaped cutout 25 is provided on the support insulating plate 24 on the upper electrode 4 side. This is for making it easy to attach a contact (not shown) to the upper electrode 4 in both the upper and side directions.

  According to the vacuum circuit breaker of the second embodiment, the number of parts of the support insulating plate 24 can be further reduced.

  According to the embodiment as described above, the number of parts of the insulating support for supporting and fixing the vacuum valve can be reduced.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 1 Flange 2a Main circuit part 2b Operation mechanism part 3 Vacuum valve 4 Upper electrode 5, 9 Support insulator 6 Fixed plate 7 Lower electrode 8 Movable shaft 10 Interelectrode support plate 11 Russell mechanism 12 Insulation operation rod 13 Operation shaft 14 Operation mechanism 20a, 20b, 24 Support insulating plates 21a, 21b Opening 22 Lower conductor 23 Contact 25 Notch

Claims (4)

A vacuum valve having a pair of detachable contacts;
A pair of insulating support plates arranged to sandwich the vacuum valve;
An upper electrode fixed to one end of the insulating support plate and fixed to the fixed side of the vacuum valve;
A lower electrode fixed to an intermediate portion of the insulating support plate and through which the movable side of the vacuum valve is in contact;
A flange fixed to the other end of the insulating support plate;
An operation mechanism fixed to the flange and disposed in the axial direction of the vacuum valve;
A vacuum circuit breaker comprising:   The vacuum circuit breaker according to claim 1, wherein the insulating support plate is integrated in three phases.   The vacuum circuit breaker according to claim 1 or 2, wherein the maximum curvature of the upper electrode and the lower electrode is the same.   The vacuum circuit breaker according to any one of claims 1 to 3, wherein an opening is provided in an intermediate portion of the insulating support plate, and the lower electrode is fixed to an end face of the opening.

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