JPH0879927A - Gas insulated switchgear - Google Patents

Abstract

PURPOSE: To prevent temperature rise of housing by providing a convection space on the outside of the solar beam receiving surface of a housing for an operating unit and a control circuit and disposing a sunshade comprising a heat insulating board and a cover bonded to the outer surface thereof in parallel with the convection space. CONSTITUTION: A convection space 11 is provided on the outside of the solar beam receiving surface of a housing 1 for an operating unit 2 and a control circuit. A sunshade 9 comprising a heat insulating board 7 of 'Styrofoam(R)' for example, and a cover 8 of aluminum, for example, bonded to the outer surface thereof is fixed in parallel with the convection space 11 by means of a fixing metal 10. Since the solar beam scarcely strike against the housing 1, temperature rise due to solar beam is avoided and since radiation of heat from the surface of the housing is not blocked because of the convection space 11, service life of semiconductors in the control circuit 3 is prolonged while preventing the grease in the operating unit from flowing out and deteriorating.

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 for preventing an increase in temperature inside a housing accommodating an operating device and a control circuit.

[0002]

2. Description of the Related Art A conventional gas-insulated switchgear is shown in FIG. In the figure, 1 is a rectangular parallelepiped casing made of an iron plate, 2 and 3 are operating devices and control circuits housed in the casing 1, 4 is a container installed on the casing 1, and operating devices 2 and A gas circuit breaker that is turned on and off by the control circuit 3 is housed. Reference numeral 5 is the sun, and 6 is the sunlight that illuminates the housing 1 and the container 4.

[0003]

Generally, the gas-insulated switchgear has high reliability, but the control circuit 3 for operating the gas circuit breaker has a relatively large number of contact failures of relays, so that the control circuit 3 has a semiconductor and We are aiming to improve reliability by using various sensors made of semiconductors.

However, the housing 1 in which the control circuit 3 is housed is greatly affected by the external environment by the sunlight 6, and the electronic components self-heat, so that the temperature inside the housing 1 rises. There is a problem that the specified operating temperature of the semiconductor is exceeded and the life of the semiconductor is significantly shortened.

For example, the effect of sunlight 6 on the housing 1 is that when the temperature in summer is around 40 ° C., the surface temperature of a part of the housing 1 rises to around 60 ° C. around 2 to 3 pm. To do.
On the other hand, the temperature rise in the housing 1 has a problem that the grease used in the operating device 2 is accelerated and deteriorated.

The present invention has been made in view of the above points, and an object thereof is to provide a gas-insulated switchgear for preventing a temperature rise of a housing accommodating an operating device and a control circuit.

[0007]

In order to solve the above-mentioned problems, a gas-insulated switchgear according to the present invention is provided with a convection space outside a surface of a housing housing an operating unit and a control circuit exposed to sunlight. In parallel, a sunshade plate including a heat insulating plate and a cover joined to the outer surface of the heat insulating plate is provided.

[0008]

The gas-insulated switchgear of the present invention configured as described above is provided with a heat insulating plate in parallel with a convection space provided outside the surface of the housing in which the operating unit and the control circuit are exposed to sunlight. Since the awning plate including the cover joined to the outer surface of the heat insulating plate is provided, the sunlight hardly hits the housing, the temperature rise in the housing due to the sunlight is prevented, and the convection space prevents the housing from rising. The radiation of heat from the surface is not hindered, the life of the semiconductor of the control circuit in the housing is extended, and the grease in the operating device is prevented from flowing out and deterioration.

[0009]

EXAMPLE One example will be described with reference to FIGS. In these drawings, the same reference numerals as those in FIG. 3 indicate the same or corresponding ones, 7 is a heat insulating plate made of a heat insulating material such as polyurethane, foam polystyrene, and 8 is an iron plate, an aluminum plate integrally joined to the outer surface of the heat insulating plate The heat insulating plate 7 and the cover 8 form a shade plate 9. 10 is a mounting bracket, and FIG.
Further, as shown in FIG. 2A, a shade plate 9 is mounted in parallel with the convection space 11 on the top surface of the top plate of the housing 1.

Reference numeral 12 denotes a cover joined to the inner surface of the heat insulating plate 7. The cover 12 is made of the same material as the cover 8, and the heat shielding plate 7 and the awning plate 9 composed of the covers 8 and 12 on both sides are shown in FIG.
And as shown in FIG. 2B, the surface of the side plate of the housing 1 is
Similar to A, a convection space 11 is provided and mounted in parallel with the mounting bracket 10.

Therefore, the sunlight 6 is blocked by the shade plate 9 and hardly hits the housing 1. However, although the cover 8 rises to a considerable temperature due to solar radiation, since the heat insulating material 7 is bonded to the inner surface of the cover 8, heat conduction due to radiation from the cover 8 to the housing 1 is prevented.

Further, the convection space 11 between the housing 1 and the awning plate 9 prevents heat conduction from the awning plate 9 and also allows air to flow between the housing 1 and the awning plate 9 so that the housing 1 The heat radiation from the inside is not hindered, and the temperature rise inside the housing 1 is prevented.

[0013]

Since the present invention is configured as described above, it has the following effects. The gas-insulated switchgear of the present invention is provided with a convection space 11 on the outside of the surface of the housing 1 accommodating the operating device 2 and the control circuit 3 exposed to the sunlight 6, and in parallel with each other. Since the sunshade plate 9 including the cover 8 joined to the outer surface is provided, the sunlight 6 hardly hits the housing 1, the temperature rise in the housing 1 due to the sunlight 6 is prevented, and the convection space 11 As a result, heat radiation from the surface of the housing 1 is not hindered, the life of the semiconductor of the control circuit in the housing 1 is extended, and the grease in the operating device 2 can be prevented from flowing out and deteriorating.

[Brief description of drawings]

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

2A and 2B are cross-sectional views of a part of FIG. 1 and another part.

FIG. 3 is a front view of a conventional example.

[Explanation of symbols]

 1 Case 2 Operator 3 Control Circuit 6 Sunlight 7 Insulation Board 8 Cover 9 Sunshade 11 Convection Space

Claims (1)

[Claims] 1. A sunshade comprising a heat insulating plate and a cover joined to the outer surface of the heat insulating plate in parallel with a convection space provided outside the surface of the housing in which the operating device and the control circuit are exposed to sunlight. Gas insulated switchgear with a plate.