JPH08329797A - Insulation gas sealed switching device - Google Patents

Abstract

PURPOSE: To lengthen the service life of a seal by improving a cooling effect of gas in a switching device such as an insulation gas sealed circuit breaker. CONSTITUTION: An opening hole 11 is arranged in a shield 5 as a gas passage so that gas effectively convects even in a space in which the gas does not convect. Therefore, a cooling effect of the gas is improved, and a temperature rise in the gas in the vicinity of an upper flange 2 is restrained, and the service life of a seal 8 can be lengthened.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switchgear such as a gas circuit breaker filled with an insulating gas, and more particularly to a main circuit portion for external connection. Less than,
A gas circuit breaker will be described as an example.

[0002]

2. Description of the Related Art FIG. 3 is a sectional view showing a conventional main circuit device for external connection of a gas circuit breaker, wherein 1 is a terminal for connecting the circuit breaker and an external circuit, and 2 is a terminal 1 from the circuit breaker main body. An upper flange 3 for guiding a current to the conductor, a conductor 4 for guiding a current from the upper flange 2 to the main body of the circuit breaker, a lower flange 5 and a shield 5 mounted on the lower flange for relaxing an electric field, 6 is the upper and lower flanges 2,
A cylindrical insulator 8 which seals the insulating gas 7 together with 4 and insulates the upper flange 2 and the lower flange 4, and 8 is installed at the connecting portion between the insulator 6 and the upper flange 2 to prevent gas leakage. A seal 9 is joined to the lower flange 4 and is a tank for accommodating the circuit breaker main body, which seals gas inside.

Next, the operation will be described. The surface of the conductor 3 has a high temperature because an electric current is flowing, and the gas in the vicinity of the conductor 3 is heated and moves upward. On the other hand, since the insulator 6 is in contact with the outside air, the temperature is low, and the gas in the vicinity of the insulator 6 moves downward. From the above,
As shown by the arrow A, the gas inside the insulator 6 is cooled by convection only in the upper region of the shield 5.

[0004]

Since the conventional main circuit for external connection is constructed as described above, the convection area of the insulating gas 7 is limited, a sufficient cooling effect cannot be obtained, and the upper flange is not provided. By heating the gas around 2, the seal 8
There was a problem that the life of the product was shortened.

The present invention has been made in order to solve the above problems. By improving the gas cooling effect, the temperature rise of the gas near the upper flange 2 is suppressed and the life of the seal 8 is reduced. The purpose is to extend it.

[0006]

According to a first aspect of the present invention, there is provided a switchgear in which a shield for relaxing an electric field is provided with an opening for a gas passage.

According to a second aspect of the present invention, an opening / closing device has a lower flange portion provided with an opening for a gas passage.

In the switchgear according to the third aspect of the present invention, the shield and the lower flange are each provided with an opening for a gas passage.

[0009]

In the switchgear according to the present invention, the cooling effect of the gas is improved and the temperature rise of the gas in the vicinity of the upper flange is suppressed by providing means for effectively convection the gas even in the space where the conventional gas does not convoke. Therefore, it is possible to prevent deterioration of the seal due to heating.

[0010]

【Example】

Example 1. Hereinafter, Embodiment 1 of the present invention will be described with reference to FIG. In FIG. 1, the same parts as those in the prior art are designated by the same reference numerals. Reference numeral 11 denotes an opening provided under the shield 5 for gas passage.

Next, the operation will be described. By providing the opening 11, the gas in the vicinity of the insulator 6 passes between the insulator 6 and the shield 5 and flows to the opening 11 as shown by the arrow B, so that the gas is effective up to the lowermost part in the insulator 6. And the convection of the gas is improved, and the gas cooling effect is improved. This suppresses the temperature rise of the gas in the vicinity of the upper flange 2 and has the effect of extending the life of the seal 8.

Embodiment 2 FIG. FIG. 2 shows the second embodiment, and in FIG. 2, reference numeral 12 is an opening penetrating the lower flange 4 and the tank 9 and provided for a gas passage. By providing the opening 12, the gas in the vicinity of the insulator 6 passes through the opening 12 from between the insulator 6 and the shield 5 and flows into the tank 9 as shown by an arrow C, so that gas convection occurs. The space extends to the tank 9, and the gas cooling effect is further improved as compared with the first embodiment. As a result, the temperature rise of the gas near the upper flange 2 is further suppressed, and the life of the seal 8 is extended.

Embodiment 3. In the above Examples 1 and 2,
Although the case where the shield 5 or the lower flange 4 is provided with an opening has been described, both the shield 5 and the lower flange 4 may be provided with an opening, which further enhances the cooling effect.

Example 4. Further, in the above embodiment, the case of the circuit breaker has been described, but the same means can be applied to an insulating gas-filled type disconnector or other switchgear, and the same effect as the above embodiment can be obtained. Play.

[0015]

As described above, according to the switchgear according to the first aspect of the present invention, the shield is provided with the opening for the gas passage as a means for effectively allowing the gas to flow into the space where the conventional gas does not flow. Since it is provided, the gas cooling effect is improved, the temperature rise of the gas near the upper flange is suppressed, and the life of the seal can be extended.

According to the second aspect of the present invention, the gas convection is provided by providing the lower flange portion with the opening for the gas passage as a means for effectively convection to the space where the conventional gas is not convected. The space is expanded into the tank, the gas cooling effect is further improved, and the life of the seal can be extended.

According to the switchgear according to the third aspect of the present invention, since the opening for the gas passage is provided in both the shield and the lower flange portion, the gas cooling effect can be further improved.

[Brief description of drawings]

FIG. 1 is a sectional view showing a first embodiment of the present invention.

FIG. 2 is a sectional view showing Embodiment 2 of the present invention.

FIG. 3 is a cross-sectional view showing a conventional main circuit device for external connection of a gas circuit breaker.

[Explanation of symbols]

1 terminal, 2 upper flange, 3 conductor, 4 lower flange, 5 shield, 6 insulator, 7 insulating gas, 8
Seals, 9 tanks, 11 and 12 holes.

Claims (3)

[Claims] 1. A tank accommodating a switchgear body, a lower flange joined to the tank, and an upper flange installed on the lower flange via a cylindrical insulator.
A shield mounted on the lower flange and a conductor mounted on the upper flange so as to penetrate to the tank, and an insulating gas is enclosed in a space surrounded by the lower flange, the insulator, and the upper flange. In the switchgear described above, an opening for gas passage is provided in the shield, and an insulating gas-filled switchgear is provided. 2. A tank accommodating a switchgear body, a lower flange joined to the tank, and an upper flange installed on the lower flange via a cylindrical insulator.
A shield mounted on the lower flange and a conductor mounted on the upper flange so as to penetrate to the tank, and an insulating gas is enclosed in a space surrounded by the lower flange, the insulator, and the upper flange. In the switchgear described above, an insulating gas filled switchgear which is provided with an opening for a gas passage that penetrates the lower flange and the tank. 3. A tank accommodating a switchgear body, a lower flange joined to the tank, and an upper flange installed on the lower flange via a cylindrical insulator.
A shield mounted on the lower flange and a conductor mounted on the upper flange so as to penetrate to the tank, and an insulating gas is enclosed in a space surrounded by the lower flange, the insulator, and the upper flange. In the switchgear described above, an opening for a gas passage is provided in each of the shield and the lower flange portion, and an insulating gas-filled switchgear is provided.