JPH07303311A - Pressure relief device for gas-filled switchgear - Google Patents

Abstract

PURPOSE:To prevent the damage of a pressure relief plate by preventing a protective cover from penetrating the wall surface of the container of a gas- filled switchgear. CONSTITUTION:A pressure relief device for gas-filled switchgear is provided with a vent 2 formed through the container of a gas-filled switchgear, a pressure relief plate 4 which closes the vent 2 and bursts to relieve the pressure in the container at the time of relieving the pressure, flat thin platy protective cover 10 provided on the atmosphere side of the plate 4, a plurality of long holes which are formed outward through the cover 10 from the central part of the cover 10, and guide bolts 13 which are loosely inserted into the central par side of the long holes and fix the cover 10 to the container.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure relief device for a gas-insulated switchgear which prevents damage to the pressure relief plate and eliminates protrusions.

[0002]

2. Description of the Related Art A conventional pressure releasing device of this type is shown in FIG. In the figure, 1 is a cover plate forming a container of a gas insulated switchgear, 2 is a pressure release port formed in the central portion of the cover plate 1, and 3 is pressure release on the outer surface of the cover plate 1, that is, the surface on the atmosphere side. An annular mounting plate 4 arranged at the peripheral portion of the mouth 2 is a disc-shaped pressure-releasing plate whose central portion is bent inward of the container, and has a V-shaped surface.
-Shaped groove is formed in a cross shape, the peripheral edge is fixed to the inner surface of the mounting plate 3, and is pressed against the O-ring 5 at the peripheral edge of the pressure release port 2.

Reference numeral 6 denotes a plurality of studs, which are planted in the peripheral portion of the pressure release port 2 of the cover plate 1, and through which the mounting plate 3 is inserted. 7 is a collar inserted in the stud 6, 8 is a pressure release port 2
Is a protective cover that covers an upper wall, a right wall, a front wall, and a rear wall, the lower surface is open, and the through holes in the peripheral portion of the right wall are inserted into the studs 6, respectively. Reference numeral 9 denotes a nut screwed to the tip of the stud 6, and presses the mounting plate 3 through the cover 8 and the collar 7 to fix the mounting plate 3 and the cover 8.

When the inside of the container rises to a predetermined pressure due to a short circuit accident or the like, the curved portion of the pressure relief plate 4 is reversed outward and ruptured along the cross-shaped groove, resulting in high-pressure insulation inside. It releases gas and prevents the destruction of the equipment inside the container and the destruction of the container.

On the other hand, the protective cover 8 regulates the flow direction of the gas at the time of pressure release, and prevents the pressure released gas from directly blowing on the maintenance personnel on the inspection passage side. Furthermore, the cover 8 is
The pressure release plate 4 is prevented from coming into contact with the pressure release plate 4 and deformation of the pressure release plate 4 is prevented and fluctuations in the pressure release pressure are prevented.

[0006]

In the case of the conventional pressure relief device, since the protective cover 8 projects from the outer surface of the cover plate 1, the entire length or height of the gas insulated switchgear is greatly increased. In addition, due to restrictions on transportation or local entrance corridors, it will be difficult to deal with them.

Further, since the cover 8 has a large opening for releasing pressure on the lower surface, there is a problem that the pressure releasing plate 4 is likely to be damaged during work such as assembly, transportation, and installation work.

The present invention has been made aware of the above points, and in the normal state,
An object of the present invention is to provide a pressure relief device of a gas insulated switchgear in which a protective cover hardly protrudes from the wall surface of a container and sufficiently covers the pressure relief plate to prevent damage to the pressure relief plate.

[0009]

In order to solve the above-mentioned problems, a pressure-release device for a gas-insulated switchgear according to the present invention comprises a pressure-release port formed in a container of the gas-insulated switchgear and the pressure-release port. A pressure-release plate that closes and bursts when pressure is released and releases pressure, a flat thin plate-shaped protective cover that is arranged on the atmospheric side of the pressure-release plate, and is transparently provided on the protective cover and extends outward from the center A plurality of elongated holes in the direction, and a guide bolt that is loosely inserted in the central portion of each elongated hole and supports the protective cover on the container.

[0010]

In the pressure releasing device of the gas insulated switchgear of the present invention having the above-mentioned structure, the protective cover is a flat thin plate,
Since a plurality of elongated holes extending outward from the central portion are provided, and a guide bolt is loosely inserted in the central portion of each elongated hole,
At the time of pressure release when the pressure release plate bursts, the pressure causes the central portion of the protective cover to spread outward, forming a gas discharge path between the wall surface of the container and the cover.

Further, in normal times, the gas insulating switchgear hardly protrudes from the wall surface of the container, the overall length or height of the gas-insulated switchgear does not increase, various restrictions are not imposed, and the pressure relief plate is sufficiently covered. Therefore, the pressure relief plate is not damaged.

[0012]

EXAMPLES Examples will be described with reference to FIGS. 1 to 6. In these drawings, the same reference numerals as those in FIG. 7 indicate the same or corresponding ones. (Embodiment 1) FIGS. 1 to 4 showing Embodiment 1 differ from the conventional example shown in FIG. 7 in the following points.

The protective cover 10 is a flat thin plate, and four elongated holes 11 are formed in the cover 10 in the direction from the center to the outside, that is, at the upper and lower positions on the left side and the right side, respectively.
The cover 10 is applied to the outer surface of the mounting plate 3 which is transparently provided in the left-right direction and has the pressure release plate 4 mounted on the inner surface thereof, and the stepped pressing portion 1 is provided.
The guide bolt 13 having 2 is the long hole 11 of the cover 10.
Also, it is inserted into the through hole 14 of the mounting plate 3 and screwed into the lid plate 1 of the container.

At this time, the holding portion 12 of the bolt 13 is pressed against the mounting plate 3, the mounting plate 3 is mounted on the lid plate 1 via the O-ring 5, and the holding portion 12 is loosely inserted into the long hole 11. , Long hole 1
It is located on the central side of 1.

When the pressure release plate 4 ruptures due to the pressure increase inside the container, the center pressure of the protective cover 10 is bulged and deformed by the pressure release pressure, and the pressure is released upward and downward. A path is formed. At this time, guide bolt 1
Since 3 is loosely inserted into the long hole 11, the cover 10 is deformed smoothly.

(Embodiment 2) FIG. 5 showing Embodiment 2 is obtained by polymerizing a rectangular reinforcing plate 15 on the inner surface of the protective cover 10 of Embodiment 1, and it is possible to cope with the high temperature of the released gas. The cover 10 is not damaged.

(Embodiment 3) In FIG. 6 showing Embodiment 3, the protective cover 10 has a square shape, and the elongated holes 1 are radially formed at each corner.
1 is transparently provided, and in this case, the cover 1 at the time of pressure release
By the deformation of 0, pressure release paths are formed in the upward, downward, left, and right directions.

[0018]

Since the present invention is configured as described above, it has the following effects. In the pressure relief device of the gas-insulated switchgear of the present invention, the protective cover 10 is a flat thin plate, and a plurality of elongated holes 11 extending from the central portion to the outside are provided through the central portion side of each elongated hole 11. Since the guide bolt 13 is loosely inserted in the pressure releasing plate 4, when the pressure releasing plate 4 bursts, the pressure causes the central portion of the protective cover 10 to spread outward, and gas is released between the wall surface of the container and the cover 10. A passage is formed to allow gas to be released along the wall of the container.

Further, in a normal state, the protective cover 10 hardly protrudes from the wall surface of the container, the total length or height of the gas insulated switchgear does not become large, and various restrictions such as transportation restrictions and restrictions on the on-site carry-in passage are required. Since there is no restriction and the pressure release plate 4 is sufficiently covered, the pressure release plate 4 is not damaged and the set release pressure is not likely to decrease.

[Brief description of drawings]

FIG. 1 is a cut front view of a first embodiment of the present invention.

FIG. 2 is an enlarged view of a part of FIG.

FIG. 3 is a perspective view of a part of FIG.

FIG. 4 is a perspective view of a modification of FIG.

FIG. 5 is a perspective view of a part of the second embodiment of the present invention.

FIG. 6 is a partial front view of the third embodiment of the present invention.

FIG. 7 is a cut front view of a conventional example.

[Explanation of symbols]

 2 Pressure release port 4 Pressure release plate 10 Protective cover 11 Long hole 13 Guide bolt

Claims (1)

[Claims] 1. A pressure release port formed in a container of a gas insulated switchgear, a pressure release plate that closes the pressure release port and bursts and releases pressure when pressure is released, and is disposed on the atmosphere side of the pressure release plate. And a flat thin plate-like protective cover, a plurality of elongated holes extending through the protective cover outward from the central portion, and loosely inserted in the central portion side of each elongated hole. A pressure release device for a gas-insulated switchgear comprising: