JPH09326224A - Switch contained in case - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to release surely a pressure within a case through a previously opened pressure release port at the time of the internal pressure rise following interphase short-circuiting. SOLUTION: A power source side bushing 13 and a load side bushing 16 are penetratingly attached respectively to the stop and bottom, two walls of the main body case 12, and a switching part A composed of a fixed electrode 15, a movable electrode 21, and the like is provided between the two bushings 13, 16. Further, a pressure release port 26 covered with a pressure release lid 27 is provided in a side wall 12a of the main body case 12. Furthermore, an arc electrode 29, as an arc guide member, is positioned substantially in the middle of respective phases, and pendently supported in a position upper than the pressure release port 26 on the inner surface side of the side wall 12a so as to extend toward between phases. Accordingly, an arc I following interphase short-circuiting does not shift to the side wall 12a but shifts to the arc electrode 29 which is near in distance and thereafter is guided to a position near the inner side of the pressure release port 26, and arc energy is discharged from the pressure release port 26 to the exterior.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cased switch, and more particularly to a cased switch having a pressure release port on a wall surface of the case.

[0002]

2. Description of the Related Art Conventionally, in a switch with a case, a pressure release port is provided on the wall surface of the case, and when the internal pressure of the case rises due to the occurrence of an abnormal voltage due to a short circuit between phases, the high internal pressure is It was intended to prevent damage to the case itself by letting it escape from the pressure relief port to the outside. That is, normally, the pressure release port is closed by the pressure release cover, and when the internal pressure rises, the pressure is pushed to the outside, and the pressure release cover and the edge of the pressure release port are closed. It was designed so that pressure could be released from the gap created in the outside of the case. The opening position of the pressure release port is set in consideration of the external environment of the switch in the case so that the pressure release direction does not affect other adjacent devices as much as possible. .

[0003]

However, the above-mentioned conventional cased switch has the following problems. That is, when a phase-to-phase short circuit occurs in the case, the arc generated due to the short circuit may move to the wall surface of the case, which is a conductor, and open a hole in the wall surface. for that reason,
The high pressure inside the case that rises due to arcing is released from the hole, and it is not possible to release pressure from the pressure release port set in consideration of the external environment of the case. There was a risk of adverse effects.

The present invention has been made to solve such a problem, and in a case-enclosed switch, when the internal pressure rises due to a short circuit between phases, the internal pressure of the case can be surely released from a pressure release port formed in advance. It is an object.

[0005]

In order to achieve the above-mentioned object, the invention of claim 1 provides a pressure release port at a predetermined position on the wall surface of the case, and an arc guide member inside the case near the pressure release port. It is the gist to have established.

The invention of claim 2 is characterized in that, in the invention of claim 1, the arc induction member is disposed between the phases. Further, the invention of claim 3 is:
The invention according to claim 2 is characterized in that the arc guiding member is elongated and extends to the vicinity of the pressure release port.

Therefore, according to the first aspect of the invention, the arc generated inside the case due to the interphase short circuit is transferred to the arc induction member, and the arc energy generated at the time of the arc transfer is released together with the release gas to the pressure release port near the arc induction member. Is released from the case to the outside of the case.

According to the invention of claim 2, in addition to the operation of the invention of claim 1, when an arc occurs between two adjacent phases due to a short circuit between the phases, the arc is generated between the two phases causing the short circuit accident. Promptly move to the arc induction member located at.

Further, in the invention of claim 3, the invention according to claim 2
In addition to the function of the invention described above, the arc transferred to the arc guide member is guided to a position near the pressure release port in the case along the long arc guide member.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment in which the present invention is embodied in a cased gas switch will be described with reference to the drawings.

As shown in FIGS. 1 and 2, the body case 12 of the cased gas switch 11 is formed in a box shape, and the body case 12 is filled with an insulating gas such as sulfur hexafluoride. . Three power source-side bushings 13 are attached in parallel to the upper wall of the main body case 12, and the power source-side conductors 1 are attached to the lower ends of the bushings 13 so as to extend into the main body case 12.
4 are provided. A power supply side power distribution cable (not shown) is electrically connected to each power supply side conductor 14, and a fixed electrode 15 is provided at the tip of each power supply side conductor 14 in the main body case 12.

On the other hand, three load side bushings 16 are attached in parallel to the lower wall of the main body case 12 so as to correspond to the power source side bushings 13. A load-side conductor 17 is provided at the upper end of each load-side bushing 16 so as to extend into the main body case 12, and a load-side power distribution cable (not shown) is electrically connected to each load-side conductor 17. In addition, in the body case 12, each load-side conductor 1
The connection conductors 18 are attached to the tip ends of the connection conductors 7 by fixing bolts 19, and the base end portions of the movable electrodes 21 are rotatably supported on the tip ends of the connection conductors 18 via the rotation pins 20. Has been done.

Each movable electrode 21 is composed of a pair of movable contact blades 22, and the fixed electrode 15 is pinched by both movable contact blades 22 at the time of insertion. Further, between the movable contact blades 22 of each movable electrode 21, the tip of the drive lever 24 linked to the opening / closing mechanism 23 is connected to the connecting pin 2.
It is rotatably supported via 5. That is, each movable electrode 21 is brought into contact with or separated from the fixed electrode 15 by the opening / closing operation of the drive lever 24 which is interlocked with the driving of the opening / closing mechanism 23. Then, the power supply side conductor 14, the fixed electrode 15, the movable electrode 21, the connection conductor 18 and the load side conductor 17
The opening / closing part A is configured by.

Further, on the side wall of the main body case 12, the side wall 1 opposite to the opening / closing mechanism 23 with the opening / closing portion A interposed therebetween.
2a has a pressure relief port 26 at a position slightly lower than the center thereof.
Is formed with an opening. A pressure release lid 27 is attached to the pressure release port 26.
Is covered. Then, when the inside of the main body case 12 has a high pressure due to the occurrence of an abnormal voltage due to the inter-phase short circuit, the internal pressure pushes the pressure release lid 27 outward,
Pressure can be released to the outside of the main body case 12 from a gap formed between the pressure release port 26 and the pressure release lid 27.

Further, a support bracket 28 made of an insulating material is mounted on the inner surface of the side wall 12a of the body case 12 at a position above the pressure release port 26 so as to extend in the interphase direction. On the support bracket 28, arc electrodes 29a and 29b in the form of a long rectangular prism made of a conductive material such as copper are suspended from the support bracket 28 so as to extend in the in-phase direction at substantially the middle of each phase. . The lower end of each arc electrode 29 extends to a position near the inside of the pressure release port 26. Therefore, as shown in FIG. 1, the arc electrode 29 is arranged in parallel with the opening / closing part A in the main body case 12, and is disposed between the side wall 12 a of the case 12 and the opening / closing part A.

Next, the operation of the switch 11 with a case constructed as described above will be described. Now, as shown in FIG. 1, when a short circuit accident occurs between the phases inside the main body case 12 in the closed state where the fixed electrode 15 and the movable electrode 21 are in contact with each other, an arc is generated between the two phases causing the short circuit accident. . For example, when a short circuit occurs between the leftmost opening / closing part A1 and the central opening / closing part A2 in FIG. 2 and an arc I occurs between these two phases, the arc I is generated at the left arc electrode 29a in FIG. Transition. That is, as is clear from FIG. 1, the arc electrode 29 is interposed between the side wall 12a of the case 12 and the opening / closing portion A as described above. Therefore, the arc I generated between the two phases of the two opening / closing parts A1 and A2 does not move to the side wall 12a of the main body case 12 beyond the arc electrode 29a between the two phases, and as shown in FIG. Arc electrode 2
Move to 9a. After the arc I is guided to a position near the inside of the pressure release port 26 along the arc electrode 29a, the arc energy generated by heat generation at the time of arc transition is released as shown by the two-dot chain line in FIG. The lid 27 is deformed. Then, based on this deformation, the pressure release lid 27 and the pressure release port 26 are
As shown by the arrow G in FIG. 1, the gas is quickly discharged from the switch case out of the switch case together with the pressure-release gas.

In the present embodiment, the case-incorporating switch 11 is configured as described above, and thus has the following effects. (1) By disposing the arc electrode 29 inside the main body case 12 near the pressure release port 26, the arc I generated due to the interphase short circuit is not transferred to the side wall 12a of the main body case 12. Therefore, it is possible to prevent the side wall 12a of the main body case 12 from being burned out by the arc I generated due to the inter-phase short circuit so that a hole is formed at an unnecessary position. Therefore,
At the time of pressure release, pressure can be released from the pressure release port 26 whose opening position is set in advance in consideration of the influence on the peripheral equipment, so that the peripheral equipment of the case-enclosed switch 11 will not be adversely affected by the released gas. (2) Further, since the arc electrodes 29a and 29b are arranged between the phases, the arc I generated between the phases can be transferred to the corresponding arc electrodes 29a and 29b when the phases are short-circuited. Therefore, the arc I generated due to the inter-phase short circuit can be rapidly transferred to one of the arc electrodes 29a and 29b, and the arc length accompanying the generation of high heat can be shortened, so that the generation of arc energy can be suppressed to the minimum. . (3) Further, since the lower end portion of each of the arc electrodes 29a and 29b is extended to a position near the inside of the pressure release port 26,
The location where arc energy is generated at the time of arc transition can be set near the pressure release port 26. Therefore, the arc energy generated along with the arc transfer can be promptly released to the outside without being trapped in the inner deep part of the main body case 12. (4) Further, since the arc electrodes 29a and 29b are arranged in parallel with the opening / closing part A so as to extend in the in-phase direction between the phases, the arc transfer from the opening / closing part A in the case of interphase short circuit is more reliable. And it can be done smoothly. (5) Further, since the arc electrodes 29a and 29b are formed in a long rectangular column shape, they can be easily attached to the support bracket 28, and the assembling work of the cased switch 11 can be easily performed.

The present invention is not limited to the configuration of the above-described embodiment, but can be configured as follows. (A) In the above embodiment, the arc electrodes 29a, 29b are arranged in parallel with the opening / closing part A so as to extend in the in-phase direction between the phases, but the lower ends of the arc electrodes 29a, 29b are located near the inner side of the pressure release port 26. It may be inclined as long as it is extended to. Even with this configuration, it is possible to prevent the arc from migrating to the side wall 12a of the main body case 12 during a short circuit between phases, and guide the arc I to a position near the inside of the pressure release port 26 so that the arc energy is released from the pressure release port 26. Can be released promptly. (B) In the above-mentioned embodiment, the arc electrodes 29a and 29b are formed in the shape of a long rectangular column, but they may be formed in the shape of a round rod or a strip plate. Even with this configuration, it is possible to obtain substantially the same effects as those of the above embodiment. (C) In the above embodiment, the arc electrodes 29a, 2 are provided between the phases.
Although 9b are provided one by one, the arc electrode 29 may be provided only one inside the main body case 12.
For example, a single plate-shaped arc electrode having a size that extends from an intermediate position between the opening / closing part A1 and the opening / closing part A2 to an intermediate position between the opening / closing part A2 and the opening / closing part A3 in FIG. You may make it support drooping. According to this structure, the work of attaching the arc electrode to the support bracket 28 can be performed quickly. (D) In the above-described embodiment, the material of the arc electrodes 29a and 29b is copper, but other conductive materials such as silver can be used as long as they are conductive materials. (E) In the above-described embodiment, the gas switch in the case is embodied, but it may be embodied in the air switch in the case.

Next, technical ideas other than the claimed invention which can be grasped from the embodiment will be described together with effects. The cased switch according to claim 3, wherein the arc induction member extends in parallel with the switch so as to extend in the in-phase direction. According to this structure, the arc generated from the opening / closing part due to the interphase short circuit can be more reliably and smoothly transferred to the arc guiding member.

[0020]

According to the invention of claim 1, when the internal pressure rises due to the inter-phase short circuit, the pressure can be surely released from the pressure release port formed in advance in consideration of the external environment. It is possible to eliminate the possibility that the released gas may adversely affect other peripheral devices adjacent to the.

According to the invention of claim 2, in addition to the effect of the invention of claim 1, since the arc length at the time of arc transition can be shortened, the arc energy generated by the arc transition can be minimized in the case. The rise in pressure can be suppressed.

According to the invention of claim 3, in addition to the effect of the invention of claim 2, the arc energy generated by the arc transfer is not trapped in the main body case, and is smoothly discharged from the pressure release port to the outside. Can be released to.

[Brief description of drawings]

FIG. 1 is a schematic side sectional view of a cased gas switch according to the present embodiment.

FIG. 2 is a partially cutaway schematic front view of the same.

[Explanation of symbols]

12 ... Main body case, 12a ... Side wall (case wall surface), 26
... Pressure release port, 29a, 29b ... Arc electrode (arc induction member), A ... Opening / closing section.

Claims (3)

[Claims] 1. A pressure release port is provided at a predetermined position on the wall surface of the case,
A switch in a case with an arc induction member inside the case near the pressure release port. 2. The case-enclosed switch according to claim 1, wherein the arc induction member is disposed between the phases. 3. The switch in a case according to claim 2, wherein the arc guiding member has an elongated shape and extends to the vicinity of the pressure release port.