JP2017208869A - Switchgear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a switchgear capable of improving gas air tightness and reducing the size of the switchgear by improving the insulation property of gas sealing part.SOLUTION: The switchgear is constituted of a combination of plural members having insulation property or plural members of a metal having floating potential, which includes: a container sealingly containing an insulation gas; a circuit breaker having a contact being disposed in the container; and an insulation rubber with a part hereof disposed air tightly among the plural members. The insulation rubber is disposed covering end part of the members clipping the insulation rubber in the container.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a switchgear in which a switch is mounted in a container filled with an insulating gas.

  As a background art in this technical field, there is JP 2010-119243 A (Patent Document 1). In this publication, “in order to provide a small vacuum switch gear, in a vacuum switch gear in which a vacuum valve having a pair of contacts that can be freely contacted and separated from an insulating container is molded, an insulation connected to a movable conductor of the vacuum valve is provided. There is described a "vacuum switchgear characterized by including a rod, and an insulating bushing through which the insulating rod penetrates and is fixed to an insulating container via an insulating rubber".

JP 2010-119243 A

  In the above-mentioned Patent Document 1, the insulating rod connected to the movable conductor of the vacuum valve penetrates and the insulating bushing is fixed to the insulating container via the insulating rubber, thereby forming the resin-rubber-resin interface insulation. A switchgear that can reduce the width direction and the depth direction of the gear is described. However, in the configuration of Patent Document 1, the contact end portion of the resin and the insulating rubber is disposed in the vicinity of the conductive coating applied to the conductor serving as the power application portion and the inner surface of the mold. This end portion has a fine R shape at the resin end portion and deformation of the insulating rubber, so that a wedge-shaped minute gap is generally formed, and an electric field can be concentrated on this portion to become a high electric field. .

  It is an object of the present invention to provide a switch gear that can improve the insulation performance of a gas sealing part.

  In order to solve the above problems, the switchgear of the present invention is configured by combining a plurality of insulating members or floating potential metal members, and is disposed inside the container, in which an insulating gas is sealed. Each of the members that sandwich the insulating rubber inside the container. It arrange | positions covering the edge part of this.

  ADVANTAGE OF THE INVENTION According to this invention, the switchgear which can improve the insulation performance of a gas sealing part can be provided. Problems, configurations, and effects other than those described above will be described in the following examples.

It is Example 1 of the switch gear of this invention, and is a sectional side view of a switch gear. It is Example 1 of the switchgear of this invention, and is an enlarged view of the broken-line part of FIG. It is Example 1 of the switchgear of this invention, and is AA sectional drawing of FIG. It is Example 1 of the switchgear of this invention, and is a top view of insulating rubber. It is Example 2 of the switchgear of this invention, and is sectional drawing of an insulating rubber. It is Example 2 of the switchgear of this invention, and is sectional drawing of an insulating rubber. It is Example 2 of the switchgear of this invention, and is sectional drawing of an insulating rubber. It is Example 3 of the switchgear of this invention, and is sectional drawing of insulating rubber. It is Example 4 of the switchgear of this invention, and is sectional drawing of an insulating rubber. It is Example 5 of the switchgear of this invention, and is sectional drawing of an insulating rubber. It is Example 6 of the switchgear of this invention, and is sectional drawing of insulating rubber.

  The switchgear of the present invention will be described below based on the illustrated embodiment. In addition, the following is an Example suitable for implementation of this invention to the last, and is not the meaning which intends limiting the application object of this invention.

  1 to 4 show a first embodiment of the switchgear of the present invention, FIG. 1 is a side sectional view of the switchgear, FIG. 2 is an enlarged view of a broken line portion shown in FIG. 1, and FIG. FIG. 4 is a cross-sectional view taken along line AA of FIG. 1, and FIG. 4 is a top view of the insulating rubber.

  The switch gear shown in FIGS. 1 to 4 includes a vacuum valve integrally cast with a solid insulator such as an epoxy resin, a bus-side cable bushing 11 including a bus-side (fixed-side) conductor 3A, and a load-side conductor 12. And a load side cable bushing 13 made of

The vacuum valve includes a fixed side end plate 2A bonded to one end of the cylindrical insulating material 1, a fixed side conductor 3A that hermetically penetrates the fixed side end plate 2A, and a movable side bonded to the other end of the cylindrical insulating material 1. An end plate 2B, a bellows-shaped bellows 4 that is joined at one end to the movable side end plate 2B and allows driving of the movable portion, and a movable side conductor that air-tightly passes through the bellows 4 and is driven in the axial direction while maintaining a vacuum. A vacuum vessel is constituted by 3B, and the internal pressure is kept at a vacuum of about 10 ⁻² Pa or less. The movable side conductor 3 </ b> B is connected to a flexible flexible conductor 18, and the flexible conductor 18 is connected to the load side conductor 12. Since the flexible conductor 18 has flexibility, the electrical connection can be maintained even when the movable conductor 3B operates in the axial direction. The fixed-side conductor 3A and the load-side conductor 12 projecting out of the vacuum container and the vacuum valve are enclosed in a resin container 14 that is integrally cast.

  In addition, a fixed side electrode 5A connected to the end of the fixed side conductor 3A and a movable side electrode 5B connected to the end of the movable side conductor 3B are disposed inside the vacuum vessel. The movable conductor 3B is connected to an operation insulating rod 6 at an end to which the movable electrode 5B is not connected, and an operation device connected to a wipe mechanism that applies a contact load to the electrode pair (not shown), and is driven in the axial direction. Is possible. As a result, the fixed side electrode 5A and the movable side electrode 5B are contacted and separated, that is, the vacuum valve is opened and closed.

  The operation insulating rod 6 is connected to the operation device outside the container 15. However, in order to maintain the airtightness inside the container 15, the container 15 is drawn out of the container 15 beyond the operation insulating rod 6. An O-ring 10 is provided at the contact portion. An insulating gas 19 is sealed in a sealed space that can be formed by combining the end of the container 15 opposite to the operating unit and the end of the resin container 14 on the movable side. In the present embodiment, the resin container 14 and the solid insulating material container 15 are used. However, instead of this, the container may be configured by using a plurality of floating potential metal members, and further, insulating properties such as resin properties may be used. You may comprise a container combining a member and a metal member of floating electric potential.

  In this embodiment, the insulating rubber 16 disposed in an airtight manner between the containers in which the insulating gas 19 is sealed is disposed so as to cover the container ends sandwiching the insulating rubber inside the container.

  Here, the configuration around the insulating rubber will be described with reference to FIG. FIG. 2 is an enlarged view of a broken line portion shown in FIG. 1, that is, an enlarged space between containers filled with insulating gas. The ends of each of the container 15 and the resin container 14 generally have a fine R shape 26 in order to prevent cracks after molding. In addition, the container 15 and the resin container 14 are fixed with a fastening member so that the hermeticity can be maintained even if vibration due to an opening / closing operation occurs in the sealed space formed by combining the ends of the container 15 and the resin container 14. Yes. Here, as shown in FIG. 3, a female screw 20 is provided in the resin container 14, and a screw hole 21 for allowing the screw to pass through a portion of the container 15 overlapping the female screw part of the resin container 14 is provided. An insulating rubber 16 is disposed between the container 15 and the resin container 14. As shown in FIG. 4, the insulating rubber 16 is provided with a screw hole 21 in a portion overlapping the female screw portion 20 of the resin container 14. The female screw portion of the resin container 14 and the screw hole 21 provided in the container 15 and the insulating rubber 16 are overlapped, and the insulating rubber 16 is sandwiched between the resin container 14 and the container 15 and fastened with screws. The insulating rubber 16 is disposed inside the container constituted by the resin container 14 and the container 15 so as to cover the fine R shape of the resin container 14 and the container 15.

  Since the switchgear of the present embodiment configured as described above covers the fine R shape 26 with the insulating rubber 16, the electric field of the fine R shape 26 can be relaxed. The reason for electric field relaxation will be described below. The fine R shape 26 of the resin container 14 and the container 15 generally forms a wedge-shaped minute gap. However, when the fine R shape 26 is not covered with the insulating rubber 16, an electric field is generated in the wedge-shaped minute gap. Concentrate and become a weak point of insulation. Here, the dielectric constant εr of the insulating gas 19 is about 1, while the dielectric constant of the insulating rubber 16 is included in the range of 2 to 20 although it varies depending on the material. Is larger than the dielectric constant of the insulating gas 19. For this reason, when the fine R shape 26 is covered with the insulating rubber 16, the electric force lines (equipotential lines) for determining the electric field value are drawn so as to avoid the insulating rubber 16. The electric lines of force (equipotential lines) become coarse, and the electric field becomes small. That is, since the electric field can be relaxed by covering the fine R shape 26 with the insulating rubber 16, the insulating performance can be improved. As a result, since the insulation distance in the container in which the insulating gas 19 is sealed can be shortened, the switch gear can be reduced in size.

  In addition, it is preferable to prevent the outflow of the insulating gas 19 due to the occurrence of dielectric breakdown between the resin container 14 and the insulating rubber 16 or between the container 15 and the insulating rubber 16, and the insulating rubber 16 is damaged, thereby improving the insulating performance. Thus, the problem can be effectively dealt with by avoiding damage to the insulating rubber 16 due to dielectric breakdown.

  FIG. 5 shows a second embodiment of the present invention. A description of the same parts as those in the first embodiment will be omitted. The insulating rubber 22A shown in FIG. 5 is sandwiched between the resin container 14 and the container 15 as in the first embodiment, and is screwed (not shown). In this embodiment, the insulating rubber 22A is disposed in contact with the container end that sandwiches the insulating rubber 22A inside the container. At this time, the screw hole of the insulating rubber and the container 15 is a female screw 20 provided in the resin container 14. And the central axis coincide with each other.

  The switchgear of the present embodiment configured as described above can not only achieve the same effect as that of the first embodiment, but also for the female screw 20 provided in the resin container 14, the insulating rubber, and the screw provided in the container 15. Since the center axes of the holes can be easily overlapped, the assembly time can be shortened. When the insulating rubber is not in contact with the container end sandwiching the insulating rubber, the female screw 20 provided in the resin container 14 and the central axes of the insulating rubber and the screw hole 21 provided in the container 15 are respectively screw holes. On the other hand, it will shift | deviate to radial direction, insulation rubber | gum will interfere and the screw of a fastening member cannot reach | attain a female screw, and cannot be screwed. In this case, since the position of the insulating rubber is readjusted and screw fastening is attempted again, the assembly time becomes long.

  In addition, as shown in FIGS. 6 and 7, the insulating rubber can obtain the same effect as long as it has a structure in contact with the end of any one of the containers.

  FIG. 8 shows a third embodiment of the present invention. A description of the same parts as those in the first embodiment will be omitted. The insulating rubber 25 shown in FIG. 8 is sandwiched between the resin container 14 and the container 15 as in the first embodiment. The insulating rubber 25 in this embodiment includes a first portion 25B that is airtightly disposed between the containers and a second portion 25A that is disposed in contact with the container end that sandwiches the insulating rubber inside the container. The second part is formed not on the side away from the first part 25B (in other words, on the inside of the container) but on the side close to the first part (in other words, on the container side or the outside of the container). Has been. By providing the gap on the container side, when the fastening member is fastened, the first member is drawn into the fastening member side and is easily deformed. Although it is preferable to provide the gap on the container side, if a gap is provided in the second part, it is possible to effectively follow the deformation to some extent regardless of the location.

  The switchgear of the present embodiment configured as described above can not only obtain the same effect as that of the second embodiment but also the second effect due to the influence of the first portion of the insulating rubber that is sandwiched and deformed between the containers. Can be prevented from leaving the inner surface of the container, and airtightness can be maintained.

  FIG. 9 shows a fourth embodiment of the present invention. A description of the same parts as those in the first embodiment will be omitted. In the insulating rubber 27 of the present embodiment, a member having a larger elastic coefficient than that of the other insulating rubber 27A is disposed on a part or the entire surface sandwiched between the resin container 14 and the container 15. FIG. 9 shows a configuration in which the insulating rubber is disposed on a part of the surface between which the insulating rubber is sandwiched. Further, the arrangement of the insulating rubber 27B may be continuous or discontinuous.

  The switchgear of the present embodiment configured as described above can not only obtain the same effect as that of the first embodiment, but also the deformation of the insulating rubber 27A due to the tightening torque of the screw due to the arrangement of the insulating rubber 27B having a large elastic coefficient. Therefore, it is possible to suppress deterioration over time of the insulating rubber due to tightening.

  FIG. 10 shows a fifth embodiment of the switchgear of the present invention. The insulating rubber of this embodiment is disposed so as to cover the entire wedge portion including the R portion at the container end. When viewed from the gas inside the container, the portion formed by the R portion looks like a wedge shape.

  The switchgear of the present embodiment configured as described above eliminates the gap in the wedge-shaped portion and avoids concentration of the electric field. Therefore, the insulation performance and the air tightness can be improved as compared with the second embodiment.

  FIG. 11 shows a sixth embodiment of the switchgear of the present invention. The insulating rubber of the present embodiment is disposed so as to cover both ends of a plurality of containers that sandwich the insulating rubber outside the container. The switchgear of the present embodiment configured as described above can further improve the airtightness as compared with the above-described embodiment because the portion where the insulating rubber and the container come into contact increases. However, the airtightness is improved even if it is arranged so as to cover at least one end of the container without covering both ends of the plurality of containers sandwiching the insulating rubber outside the container as in this embodiment. Therefore, a certain effect can be expected.

  In addition, this invention is not limited to an above-described Example, Various modifications are included. For example, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described. Further, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. Further, it is possible to add, delete, and replace other configurations for a part of the configuration of each embodiment.

DESCRIPTION OF SYMBOLS 1 ... Cylindrical insulating material, 2A ... Fixed side end plate, 2B ... Movable side end plate, 3A ... Fixed side conductor, 3B ... Movable side conductor, 4 ... Bellows, 5A ... Fixed side electrode, 5B ... Movable side electrode, 6 ... Insulating rod for operation, 10 ... O-ring, 11 ... bus-side bushing, 12 ... load-side conductor, 13 ... load-side bushing, 14 ... resin container, 15 ... operator-side container, 16 ... insulating rubber, 17 ... fastening member, DESCRIPTION OF SYMBOLS 18 ... Flexible conductor, 19 ... Insulating gas, 20 ... Female screw, 21 ... Screw hole, 22A-22E ... Insulating rubber, 25A, 25B ... Insulating rubber, 26 ... Fine R shape, 27 ... Insulating rubber

Claims (8)

A container configured by combining a plurality of insulating members or metal members having a floating potential, and containing an insulating gas;
A switch having a contact disposed inside the container and detachable from the container;
Comprising an insulating rubber partly hermetically disposed between the plurality of members;
The switchgear is characterized in that the insulating rubber is disposed inside the container so as to cover end portions of the members sandwiching the insulating rubber. The switchgear according to claim 1,
A switchgear comprising: each member sandwiching the insulating rubber; and a fastening member for fastening the insulating rubber. The switchgear according to claim 2,
The insulating rubber is disposed in contact with an end of at least one of the members sandwiching the insulating rubber. The switchgear according to claim 3, wherein
The insulating rubber includes a first portion sandwiched between the members, and a second portion disposed along the members disposed inside the container,
A switchgear characterized in that a gap is formed in the second part. The switchgear according to claim 4,
The gap is formed on a side close to each of the members in the second portion. The switchgear according to any one of claims 2 to 5,
In addition to the insulating rubber, a member having a larger elastic coefficient than the insulating rubber is disposed at a portion sandwiched between the members. The switchgear according to any one of claims 1 to 6,
The switchgear is characterized in that the insulating rubber is disposed so as to cover the entire wedge part at the end of each member sandwiching the insulating rubber. The switchgear according to any one of claims 1 to 7,
The switchgear is characterized in that the insulating rubber is disposed outside the container so as to cover at least one end of the plurality of members sandwiching the insulating rubber.

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