JP2003153406A - Gas-insulated switchgear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas-insulated switchgear which has a plurality of gas sections, can avoid release of insulating gas into the atmosphere when the pressure in the gas section is elevated, can protect other apparatuses from damages caused by broken pieces of a bursting valve, is hygienic for an environment, and is safer. SOLUTION: In this gas-insulated switchgear having a plurality of sections, respective gas sections are partitioned by insulating spacers fixed to a flange surface of a vessel, the insulating spacers are housed in the vessel, and a bursting device is placed on the flange surface. If a pressure is elevated in one section, the bursting device is broken and the internal gas is released into the other gas section.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas-insulated switchgear having a plurality of gas compartments, and more particularly to a gas-insulated switchgear suitable for hygiene to the global environment and safety of the device.

[0002]

2. Description of the Related Art When a short circuit accident or a ground fault occurs inside a gas insulated switchgear, the arc energy increases the pressure inside the container. Although the container is manufactured to withstand such a rise in pressure, if the removal by the circuit breaker is delayed, the pressure may exceed the allowable value. In extreme cases, the arc energy and pressure increase may cause the container to melt or explode, releasing toxic decomposition gas generated by insulating gas or arc energy into the atmosphere, and scattered fragments of the container to damage other equipment. Could give.

Usually, in order to prevent the container from exploding due to an increase in pressure, a device called a pressure relief valve having a lower allowable pressure than other parts is installed in advance so that the pressure in the container becomes a certain value. Occasionally, the pressure relief valve bursts and a structure is used to prevent the container from exploding.

Conventionally, the pressure relief valve is installed at a position where the pressure is released in a direction such that the operator of the gas-insulated switchgear cannot directly approach it, such as directly above or below, so as to avoid the risk of bursting. Furthermore, a protective cover may be provided so that the rupture pieces do not scatter.

[0005]

However, in this conventional method, the toxic decomposition gas generated by the insulating gas or the arc energy is released into the atmosphere. Further, even if the protective cover is installed, the ruptured pieces of the pressure relief valve may damage other devices.

In particular, when SF ₆ gas is used as the insulating gas, the emission of SF ₆ gas itself is regulated as a global warming gas, and due to global environmental problems, it must be avoided to release it into the atmosphere. If you like.

An object of the present invention is to provide a gas-insulated switchgear capable of preventing the release of insulating gas into the atmosphere when the internal pressure rises and at the same time avoiding damage to other equipment.

[0008]

In order to solve the above problems, the present invention provides a gas insulated switchgear having a plurality of gas compartments, wherein the gas compartments are separated by an insulating spacer fixed to a flange surface of a container. And a pressure release device for releasing pressure to the other gas compartment when the pressure inside one gas compartment rises, the pressure release device being installed on the flange surface of the container. It is what

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a structural view of a connecting portion of a gas insulated switchgear according to a first embodiment of the present invention, and FIG. 2 is a right sectional view of FIG. As shown in the figure, cylindrical metal containers 1 and 2
A high-pressure insulating gas is enclosed inside the. The containers 1 and 2 are joined at their flange surfaces 1a and 2a, and fastened with a bolt 3. Gas tightness of the joint is O-ring 4
It is held at. The spacer 5 is attached to the flange surface 2a with a bolt 6. Spacer 5 and flange surface 2
An O-ring 7 is inserted between a and the gas compartments in the container 1 and the container 2 are separated. The center conductors 1b and 2b arranged in parallel with each other in three phases are connected via a spacer 5. The pressure relief valve 8a is attached to the flange surface 2a with a bolt 9a, and an O-ring 10a is inserted at the joint. In this structure, the gas in the container 1 and the gas in the container 2 are usually independent of each other, and the gas compartments are also different.

When a ground fault or a short circuit occurs in the container 2, the pressure inside the container 2 rises, but the pressure release valve 8a bursts at the moment when the pressure reaches a certain set pressure, and the internal gas is transferred from the container 2 to the container 1. Flow into each of them, and each is in equilibrium with the same pressure. Even if the pressure release valve 8a bursts, the gas tightness of the containers 1 and 2 is maintained by the O-ring 4, so that the internal gas is not released into the atmosphere. Further, the ruptured pieces of the pressure release valve 8a scatter into the container 2, but do not scatter to the outside of the container.

In the gas-insulated switchgear having a plurality of gas compartments, if the first embodiment described above is applied, even if the pressure inside one gas compartment rises, it is discharged to the other gas compartment. By applying the pressure, it is possible to suppress the release of the insulating gas into the atmosphere. Further, it is possible to avoid damage to other devices due to the rupture of the pressure relief valve.
Since it affects even the adjacent gas compartment, the amount of work at the time of restoration such as cleaning and replacement will increase, but if the internal gas is recovered by the recovery device, the release of gas into the atmosphere can be prevented,
Also, damage to other devices can be avoided.

FIG. 3 is a structural view of a connecting portion of a gas insulated switchgear according to a second embodiment of the present invention, and FIG. 4 is a right sectional view of FIG. The description of the part having the same structure as the previous example is omitted. The pressure relief valves 8a and 8b are attached to the flange surface 2a by bolts 9a and 9b in opposite directions. Since the gas tightness of each gas is maintained at 10a and 10b, the gas compartments inside the container 1 and the container 2 are different.

When the pressure inside the container 2 rises due to a ground fault or a short circuit, the pressure release valve 8
a bursts, the internal gas flows from the container 2 to the container 1, and each is in the equilibrium state of the same pressure. On the other hand, when a ground fault or a short circuit occurs inside the container 1, the internal pressure of the container 1 rises, but the pressure release valve 8b bursts at the moment when a certain set pressure is reached, and the internal gas is transferred from the container 1 to the container 2. And each of them are in the equilibrium state with the same pressure. In any case, even if the pressure relief valves 8a and 8b burst, the gas tightness of the containers 1 and 2 is maintained by the O-ring 4, so that the internal gas is not released into the atmosphere. Further, the ruptured pieces of the pressure relief valves 8a and 8b are scattered inside the container but are not scattered outside the container.

In the gas-insulated switchgear having a plurality of gas compartments, if the second embodiment described above is applied, even if the gas pressure in one of the compartments rises, the gas compartment in the other side is Since the gas pressure can be released, the release of the insulating gas into the atmosphere can be suppressed. Further, it is possible to avoid damage to other devices due to the rupture of the pressure relief valve.

In the first and second embodiments,
An example of a gas-insulated switchgear in which the conductors inside the container are arranged in parallel in a three-phase package is shown. It can also be applied to gas-insulated switchgear.

According to the gas-insulated switchgear according to the present invention, in a gas-insulated switchgear having a plurality of gas compartments, a pressure relief device is attached to the section screen so that the insulating gas inside is exposed to the atmosphere. Release can be avoided. In addition, there is no need to worry about the damage caused by the burst pieces caused by the pressure release to other devices. Considering the pressure increase when an accident occurs inside the gas insulated switchgear, it is not economically advantageous to increase the strength of the container excessively without installing a pressure relief valve. In addition, it is not a good idea to install a pressure relief valve and a receive tank to prevent the release into the atmosphere, both from the viewpoints of downsizing and economics. On the other hand, according to the present invention, the amount of work at the time of restoration such as cleaning or replacement is increased because the adjacent gas compartment is affected when the pressure is released.
In consideration of environmental issues, it is possible to avoid the release of insulating gas or decomposed gas into the atmosphere, and there is no damage to other equipment due to the rupture pieces of the pressure relief valve. A device can be provided.

[0018]

As described above, according to the present invention,
It is possible to obtain a gas-insulated switchgear that can prevent the release of insulating gas into the atmosphere when the internal pressure rises and at the same time avoid damage to other devices.

[Brief description of drawings]

FIG. 1 is a structural diagram showing a structure of an entire joint portion of a gas insulated switchgear according to a first embodiment of the present invention.

FIG. 2 is a right sectional view of FIG.

FIG. 3 is a structural diagram showing a structure of an entire joint portion of a gas-insulated switchgear according to a second embodiment of the present invention.

FIG. 4 is a right sectional view of FIG.

[Explanation of symbols]

1, 2 ... Container, 1a, 2a ... Flange, 1b, 2b ... Central conductor, 3, 6, 9a, 9b ... Bolt, 4, 7, 10 ...
O-ring, 5 ... Insulating spacer, 8a, 8b ... Pressure release valve.

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 5G017 DD13 FF08                 5G365 DA14 DE02 DF01 DF02 DF06                       DH08 DH10 DM02

Claims (2)

[Claims] 1. A gas-insulated switchgear having a plurality of gas compartments, wherein the gas compartments are separated by an insulating spacer fixed to a flange surface of a container, and when the pressure inside one of the gas compartments rises. And a pressure release device for releasing pressure to the other gas compartment, the pressure release device being installed on the flange surface of the container. 2. The gas-insulated switchgear according to claim 1, wherein the pressure relief device is installed on the flange surface so that the pressure relief directions thereof are opposite to each other, and the pressure relief device allows adjacent gas sections to be mutually connected. A gas-insulated switchgear that can release pressure.