JPH08223719A - Gas-insulated switchgear - Google Patents

Abstract

PURPOSE: To obtain a gas-insulated switchgear which is not large, whose costs are not increased and which suppresses a rise in the temperature of a conductor when a large current flows. CONSTITUTION: Fins 21, 22 for heat radiation are installed on both faces of a lid plate 11 for a GIS. The fins installed on the inside and outside faces of the lid plate increase the surface area of a container, and the heat radiation characteristic of the container is enhanced. Thereby, since heat generated by conductive parts 4 to 7 for the GIS can be radiated, with high efficiency, to the outside of the container, the temperature rise of the conductive parts can be suppressed even when a large current flows to the GIS. In addition, since the fins are installed only on the lid plate, the GIS is not made large and its cost is not increased sharply. In addition, the tip of the fin on the side at the inside of the container out of the fins installed on the lid plate is bent so as to increase an area facing a charged part, and a shape which relaxes an electric field can be formed.

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 (hereinafter referred to as "GIS"), and more particularly to a GIS for energizing a large current.

[0002]

2. Description of the Related Art In GIS, Joule heat is generated by the current flowing through a current-carrying portion, and the temperature of the current-carrying portion rises.
Also, due to the current flowing through the conductor placed inside the container,
Induction current also flows in the container itself, and Joule heat is generated. The heat generated in the current-carrying part is mainly transferred from the insulating gas inside the container to the container and released to the atmosphere outside the container. The heat generated in the container and the heat transferred to the container are released to the atmosphere outside the container or transferred to other parts of the container.

The temperature rise value of the current-carrying portion is specified by the standard. Therefore, even if a large current is passed through the GIS, in order to suppress the temperature rise value of the current-carrying part within the standard value, the GIS container should be made of a non-magnetic material such as aluminum, and should have conductivity and heat resistance. Manufactured from a material with high conductivity to reduce the heat generated by the container itself and at the same time quickly transfer the heat inside the container to the outside to increase the cross-sectional area of the conductor and reduce the main circuit resistance. However, measures have been taken to reduce heat generation in the conductor.

[0004]

SUMMARY OF THE INVENTION In the above conventional measures,
In the case of, because the container is made of expensive aluminum,
The manufacturing cost of the container becomes high and the GIS becomes expensive. Also,
In such a case, the shape of the container and the like must be increased in order to ensure the electrical insulation performance in accordance with the increase in the conductor diameter, which leads to an increase in the size of the GIS.

It is an object of the present invention to suppress the temperature rise of the energizing portion during energization of a large current without increasing the size and cost of the GIS.

[0006]

In order to achieve the above object, the present invention provides fins for heat dissipation on both sides of a lid plate of GIS.

[0007]

The fins provided on both the inner and outer surfaces of the lid plate increase the surface area of the container to improve the heat dissipation characteristics of the container, and transfer heat from the insulating gas to the container and from the container to the atmosphere. Do it efficiently. As a result, the heat generated by the current-carrying portion of the GIS is efficiently released to the atmosphere, so that the temperature rise value of the current-carrying portion can be suppressed low even when a large current is passed through the GIS.

Further, among the fins provided on the cover plate, by bending the tips of the fins on the inner surface side of the container, the area facing the charging portion housed inside the container is increased and the electric field concentration by the fins is alleviated. You can Also, G
In the IS, the lid plate is a place where the fins can be easily attached, and even if a protrusion such as a fin is provided, a relatively insulating distance can be secured. Therefore, the size of the GIS and the cost are not increased.

[0009]

Embodiments of the GIS of the present invention will be described below with reference to the drawings. FIG. 2 is a side view showing the structure of the GIS of this embodiment. GIS is inside the containers 1, 2, and 3,
Busbar 4, gas circuit breaker 5, main circuit conductor 6, 7 etc. are stored,
An insulating gas such as SF ₆ gas is enclosed inside. In addition, 8 is an operation panel, and 12 is an attachment portion of a busbar connected to an adjacent unit.

The containers 1 and 2 are provided with openings for performing assembly work, internal inspection work, etc., and lid plates 11 and 13 for covering the openings. Cover plates 11, 13
Are bolted to the flanges provided in the openings of the containers 1 and 2 during operation of the GIS to close the openings of the containers 1 and 2. Also, during the assembly work and the inspection work, these lid plates 11 and 13 are removed, and a worker carries out the assembly and inspection work inside the containers 1, 2 and 3 through the openings.

Fins 21 and 2 for heat dissipation are provided on the lid plates 11 and 13.
2, 23 are provided. Of these, the structure of the cover plate 11 is shown in FIG. 1, but other cover plates are formed similarly to the cover plate of FIG. In FIG. 1, (A) shows a back surface arranged inside the container, (B) shows a side surface, (C) shows a surface arranged outside the container, and (D) shows a lower surface. In FIG.
The container 2 to which the lid plate 11 is attached and its flange 14
Is indicated by a chain double-dashed line. Although the conventional lid plate is formed in a circular shape having the same diameter as the flange 14, the lid plate 11 of the present embodiment is
It is formed in a rectangular shape larger than the diameter of the flange 14 of the container 2 to increase the heat dissipation area of the lid plate 11. The shape and size of the cover plate 11 can be changed as appropriate according to the circumstances around the cover plate 11.

A plurality of fins 21 and 22 are provided on both sides of the cover plate 11, respectively. As shown in FIG. 1D, the fins 21 on the front surface, which are outside of the container 2, have an L-shaped cross section, and the fins 22 on the back surface have a U-shaped cross section. Also,
The fins 21 and 22 are arranged such that the longitudinal direction thereof is vertical when the cover plate 11 is attached to the container 2.

Here, when the cover plate 11 is attached to the container 2, the fins 22 on the rear surface side are arranged to face the charging portion arranged inside the container 2. Therefore, the fin 22 has its tip bent to increase the area of the portion facing the charging portion, and relaxes the concentration of the electric field due to the provision of the fin. The bent shape of the tip can be changed as appropriate.

Further, in order to provide the fins 21 and 22 on the cover plate 11, any method such as welding or bolting can be adopted, but in order to improve the heat transfer coefficient between the fins and the cover plate, It is preferably attached by welding. Also,
The lid plate 11 and the fins 21 and 22 may be integrally formed by casting. Further, the lid plate 11 and the fins 21 and 22
The material is preferably made of a non-magnetic material such as aluminum and a good heat conductor. As mentioned above, although aluminum is expensive, making only the lid plate of such a material, rather than the entire container, does not add much to the overall cost. Further, heat absorption and release can be facilitated by taking measures such as forming an oxide film on the surface of the fin or roughening the surface.

In addition to the fins 21 and 22, the lid plate 11 is provided with a pressure releasing plate 24 for breaking and releasing the insulating gas inside when the gas pressure inside the container rises abnormally, and a portion inside the container. An adsorbent container 25 for adsorbing impurities in the insulating gas generated by electric discharge is provided. As shown in FIG. 1, the fins 21 and 22 are arranged so as to avoid these accessories.

In the GIS constructed as above,
When a current flows through the current-carrying parts such as the bus bar 4, the gas circuit breaker 5, the main circuit conductors 6 and 7 which are housed inside the containers 1, 2 and 3,
Joule heat is generated and the temperature of the current-carrying part rises. Also,
An induced current is generated in the containers 1, 2 and 3 due to the current flowing in the energizing portion, and Joule heat is also generated in the containers 1, 2 and 3 to raise the temperature.

The heat generated in the energized portion is mainly transferred to the containers 1, 2 and 3 including the lid plate 11 through the insulating gas.
Further, the heat transferred to the containers 1, 2 and 3 and the heat generated in the container itself are released to the outside of the container and, at the same time, transferred to the lid plate 11 through the container. Here, the fins 22 provided on the inner surface side of the cover plate 11 transfer the heat of the insulating gas to the cover plate 11. In addition, the lid plate 11 itself and the outer fins 21
Releases the heat transferred to the cover plate 11 to the outside. At this time, a lid plate (11 and 1 in FIG. 1) provided on the side surface of the container is used.
In 2), since its longitudinal direction is arranged in the vertical direction, the insulating gas inside the container and the atmosphere outside the container are smoothly convected, and heat exchange is efficiently performed.

As described above, the heat generated inside the GIS is quickly released to the outside by the fins 21 and 22 provided on the cover plate 11, so that the temperature rise of the conductor can be suppressed to a low level. Further, it is not necessary to increase the cross-sectional area of the conductor, and the conventional structure can be used as it is as the entire structure of the container except the cover plate. Further, the fins are easier to attach to the lid plate than the other parts of the GIS, and the insulation distance is relatively easy to secure. Therefore, the size of the GIS is not increased and the cost is not increased.

[0019]

As described above, according to the present invention, it is possible to reduce the temperature rise of the energized portion of the GIS while preventing the GIS from becoming large and the manufacturing cost from greatly increasing.

[Brief description of drawings]

FIG. 1 is a front view, a side view, a rear view, and a bottom view showing an embodiment of a cover plate used in a GIS of the present invention.

FIG. 2 is a side view showing the overall configuration of an embodiment of GIS of the present invention.

[Explanation of symbols]

 1, 2, 3 ... Container 4 ... Busbar 5 ... Gas circuit breaker 6, 7 ... Conductor 8 ... Operation panel 11, 13 ... Lid plate 14 ... Flange 21, 22 ... Fin 24 ... Pressure release plate 25 ... Adsorbent

Claims (2)

[Claims] 1. A gas-insulated switchgear comprising a cover plate provided with fins for heat dissipation on both sides at the opening of the container. 2. The fin of the fin facing the charged portion inside the container when the fin is attached to the container is bent to have a shape to alleviate an electric field. Gas insulated switchgear.