JP2595794B2 - Self-cooling gas-insulated induction device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a sulfur hexafluoride gas (SF ₆
Self cooling gas for cooling the contents accommodated in the tank by natural convection inside the tank induction apparatus simply referred to as a gas), such as transformers and reactors to be insulated medium, in particular SF ₆ gas as a cooling medium The present invention relates to an insulation induction device.

[Conventional technology]

FIG. 3 is an elevation view of a conventional self-cooling type gas-insulated transformer. The tank 18 contains the transformer contents 9 and SF ₆ gas is sealed therein. During operation, when the temperature rises due to the loss of the coils and iron cores constituting the transformer contents 9, the heat is
Transferred to SF ₆ gas. The SF ₆ gas, which has been heated and raised in temperature, expands and becomes light, rises, and enters the panel radiator 1 through the outlet pipe 14 and the upper common gas pipe 12. The panel radiator 1 is composed of a plurality of panel-shaped thin panel radiators arranged at a predetermined interval in the vertical direction in the figure as shown in the figure. A gas pipe 12 is provided.

The surface of the panel radiator 11 is in contact with air over a large area, and heat is dissipated from this surface to reduce the SF inside the panel.
₆ Gas is cooled. The cooled SF ₆ gas moves from the upper part to the lower part, returns to the lower part of the tank 18 through the lower common gas pipe 3 and the inlet pipe 15. Thus, SF ₆ gas is stored in tank 18
By repeating heating and radiating heat while circulating between the radiator and the panel radiator 11, heat generated in the transformer contents 9 is effectively radiated to the outside air. SF in tank 18
₆ The movement of the gas is by natural convection, and although the cooling efficiency for the transformer contents 9 is lower than that of the system in which forced convection is performed using a blower or the like, there are advantages such as a simple structure and high reliability. Used in relatively small capacity gas insulated transformers.

The opening of the outlet pipe 14 to the tank 18 is provided at the center of the upper cover 181 covering the upper part of the tank 18, and the inlet pipe 15 is divided into right and left avoiding the center where the inlet pipe 14 is provided. A book is provided, and its opening is provided at the lower end near the bottom of the side surface of the tank 18.

FIG. 4 is an elevational view showing a conventional gas-insulated transformer different from FIG. In this figure, two outlet pipes 24 are provided diagonally symmetrically from the left and right ends of the upper cover 282 in the figure and connected to the radiator 21 via the upper common gas pipe 22 and the lower common gas pipe 22. An inlet pipe 25 provided at the center of the drawing from the pipe 23 is connected to the lower part of the tank 28.

A warm air guide 282 provided to cover the upper portion of the tank 28 is provided to improve the flow of air flowing into the panel radiator 21 from below (Japanese Utility Model Laid-Open No. 1-171012).

[Problems to be solved by the invention]

By the way, the conventional tank 18 shown in FIG. 3 and FIG.
Each of the upper covers 181 and 281 of the 28 is formed of a horizontal flat plate. Therefore, when the SF ₆ gas heated by the transformer contents 9 gathers at the outlet pipes 14 and 24, the SF ₆ gas hits the upper covers 181 and 281 and cannot flow smoothly, so that there is a problem that cooling performance is hindered.

An object of the present invention is to provide an SF that flows from a tank to an outlet pipe.
_{(6) An} object of the present invention is to provide a self-cooled gas-insulated induction electrode in which the cooling effect is improved by improving the gas flow.

[Means for solving the problem]

According to the present invention to solve the above-described problems, a tank in which the contents of an induction electric device are housed and an insulating gas is sealed therein, and an insulating gas provided in an upper portion of the tank and heated in the tank are cooled. A radiator to be connected, an outlet pipe connected by conducting the upper end of the radiator and the upper end of the tank, and an inlet pipe connected by conducting the lower end of the radiator and the lower end of the tank. In the self-cooling type gas-insulated transformer, wherein the tank includes a tank body and an upper cover that covers an upper portion of the tank body, the upper cover is inclined, and an opening of the outlet pipe to the tank is formed. It shall be provided at the highest part of this upper cover.

[Action]

In the configuration of the present invention, the upper cover is inclined, not horizontal, so that the temperature of the SF ₆ is increased by the heat generated by the heat generated by the contents of the induction device such as the iron core and the winding.
When the gas moves upward in the tank and hits the upper cover, it moves diagonally upward along the slope of the upper cover and smoothly flows to the opening of the outlet pipe provided at the highest part of the upper tank. SF ₆ in the tank to get together
Gas flow is improved.

〔Example〕

Hereinafter, the present invention will be described based on examples. FIG. 1 is an elevation view of a gas-insulated transformer showing an embodiment of the present invention.
The figure is a plan view thereof. In these figures, the upper cover 81 has a shape similar to a gable in terms of a roof shape, and adopts a structure in which a central portion thereof is highest and descends toward both ends. The outlet pipe 14 is provided at the center of the upper cover 81 which is the highest position, and the upper common gas pipe 2
To the upper part of the panel radiator 1. The two inlet pipes 5 are connected to the lower part of the tank 8 via two lower common gas guide pipes 3 provided at the lower part of the panel radiator 1. In this figure, two inlet pipes 5 are arranged so as to sandwich the outlet pipe 4, and the opening is provided in the front wall of the tank 8 whose surface is shown in the figure. The two-dot chain line temporarily shows the outlet pipes 50 provided separately on both sides of the tank 8, and either of them may be adopted.

The SF ₆ gas in the tank 8 heated and heated by the heat generated by the transformer contents 9 becomes lighter due to expansion, moves toward the upper part of the tank 8, and hits the upper cover 8.
When the SF ₆ gas hits the inclined upper cover 8 further rises along the inclined surface, the rising SF ₆ gas gathers smoothly in the outlet pipe 4 because of the opening of the outlet pipe 4 at the highest part. . By providing the outlet pipe 4 at the highest position by inclining the upper cover 81 in this way, the SF ₆
Movement in the tank 8 of the gas is improved convection which circulates between the tank 8 and the panel radiator 1 of SF ₆ gas becomes smooth cooling efficiency is improved.

When the cooling efficiency is improved, the number of panel radiators of the panel radiator 1 required to obtain the same cooling effect can be reduced, and as a result, the cost of the gas insulating transformer is reduced.

In FIGS. 1 and 2, the upper cover 81 has a gable shape in which a central portion is high and is inclined downward toward both sides.
Since the central portion is high, the position of the outlet pipe 4 is appropriate in the central portion as described above, and accordingly, the inlet pipe 5 is distributed to both sides and the opening is formed on the front wall or the side wall of the tank 8 in the figure. Arrange to have. On the other hand,
It is also possible to adopt a method in which the one-sided flow where the right side in the figure is the highest is provided and the opening position of the outlet pipe 4 to the tank 8 is provided on the right side. Further, it is also possible in principle to form the outlet pipe 4 on both sides by making the center part concave in shape opposite to the gable and to provide openings at the left and right ends. The shape of the upper cover and the arrangement of both the outlet and inlet pipes and the upper and lower common gas pipes are determined in consideration of factors other than the present invention, such as ease of manufacture including the tank 8 and price. Things.

Although the gas-insulated transformer is taken as an example in the above-described embodiment, the gas-insulated reactor also employs a tank, a radiator, and pipes and gas-conducting pipes for connecting these components that have the same structure as the gas-insulated transformer. Therefore, the present invention can be generally applied to a self-cooling type gas-insulated induction device including these.

〔The invention's effect〕

As described above, by tilting the upper cover, the present invention raises the temperature of the SF ₆ gas, which is heated by the heat generated by the iron core and the windings, and moves upward in the tank, causing the upper cover to be inclined. When it hits, it moves diagonally upward along this slope and is smoothly guided to the opening of the outlet pipe provided at the highest part of the upper cover,
The flow of SF ₆ gas is improved and cooling efficiency is improved. As a result, an effect is obtained in that the number of panel radiators required for obtaining the same cooling effect can be reduced and the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is an elevation view of a gas-insulated transformer showing an embodiment of the present invention, FIG. 2 is a plan view of the gas-insulated transformer of FIG. 1, and FIG. 3 is a view of a conventional self-cooling gas-insulated transformer. Elevation, Fig. 4 is 3
It is an elevational view of the conventional gas insulation transformer different from a figure. 1,11,21… Panel radiator (radiator), 2,12,22 …… Upper common gas pipe, 3,13,23 …… Lower common gas pipe, 4,14,24
…… Outlet piping, 5,50,15,25 …… Inlet piping, 8,18,28 ……
Tank, 81,181,281 …… Top cover, 9 …… Transformer contents (induction electric machine contents).

Claims (1)

(57) [Claims] 1. A tank in which the contents of an induction electric device are housed and in which an insulating gas is sealed, a radiator provided above the tank to cool the insulating gas heated in the tank, and a radiator An outlet pipe connected by conducting the upper end of the tank and the upper end of the tank, and an inlet pipe connected by conducting the lower end of the radiator and the lower end of the tank.
In the self-cooling type gas-insulated induction lamp, wherein the tank includes a tank body and an upper cover that covers an upper portion of the tank body, the upper cover is inclined, and an opening of the outlet pipe to the tank is formed in the upper cover. A self-cooling gas-insulated induction device, which is provided at the highest part of the device.