JPH07226322A - Gas insulated transformer - Google Patents

Abstract

PURPOSE:To make it possible to guide the insulating gas, cooled by a cooling device, to the lower part without increasing the area of installation of a transformer by a method wherein a partition board is provided on the surface of a tank side wall in the tank. CONSTITUTION:A base 8 is provided inside the cover 10 of a tank, a partition board of insulating material is fixed, a gap is provided between the side wall of the tank 3 and the partition board, and the aperture part of the partition board 9 is arranged on the lower part of a winding 1. As a result, the insulating gas 5 flows in the tank 3 from a piping 7, passes through the gap between the side wall of the tank 3 and the partition board 9, and it flows in the lower part of the winding 1 Also, as both ends of the partition board 9 are pinched by a guide board 11 fixed to the side wall of the tank 3, the insulating gas 5 does not flow in the space on the side of the wiring l and the core 2 passing both ends of the partition board 9. Besides, as an insulating material is used for the partition board 9, it is unnecessary to provide insulation distance between the partition board 9 and the winding 1. As a result, the tank does not increase in size.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION This invention relates to gas insulated transformers.

[0002]

2. Description of the Related Art A gas-insulated transformer does not require an accessory such as a conservator at the upper portion unlike an oil-filled transformer, and therefore the upper space can be effectively used. Therefore, as shown in FIG. 2, a cooling device is installed in the upper space to reduce the installation area. That is, the winding 1 and the iron core 2
The cooling device 4 is installed above the tank 3 in which the insulating gas 5 heated by the heat generation of the winding 1 and the iron core 2
Enters the cooling device 4 via the pipe 6 and is cooled, and is guided to the lower part in the tank 3 via the pipe 7 provided outside the tank 3.

[0003]

However, in such a structure, since the cooling device is on the tank, the installation area of the cooling device can be reduced, but the cooling device and the tank are connected and the insulating gas 5 is passed. Since the pipe 7 goes out of the tank, there is a drawback that the installation area of the transformer becomes larger accordingly.

Therefore, an object of the present invention is to provide a gas-insulated transformer which can guide the insulating gas cooled by the cooling device to the lower portion of the tank without increasing the transformer installation area.

[0005]

In the present invention, a partition plate made of an insulating material is installed in the tank along the side wall surface of the tank, and the insulating gas returning from the cooling device to the tank is separated from the tank side wall and the partition plate. It is configured to be guided to the lower part of the tank through the gap.

[0006]

With this structure, the insulating gas cooled by the cooling device can be guided to the lower part of the tank through the inside of the tank. Further, since the partition plate is made of an insulating material, there is no need for an insulating distance between the winding plate or the connecting lead and the partition plate, so that the tank can be set to the same size as the conventional one.

[0007]

FIG. 1 shows an embodiment of the present invention.
1A is a transverse sectional view of the transformer, and FIG. 1B is a plane sectional view taken along the line AA of FIG. In FIG. 1 (a), the tank 3 in which the winding 1 and the iron core 2 which are heating elements are filled with the insulating gas 5.
It is installed sealed inside. At the top of tank 3,
A cooling device 4 for radiating heat generated by the winding 1 and the iron core 2 to the atmosphere is installed, and the insulating gas 5 is warmed by the winding 1 and the iron core 2 and rises, and the piping 6
It flows into the cooling device 4 through the pipe and is cooled, and then flows into the tank 3 again from the upper part through the pipe 7 connecting the cooling device 4 and the cover 10 of the tank. In order to cool the winding 1 and the iron core 2, the insulating gas 5 having a temperature as low as possible must be introduced from the lower part of the winding 1 and the iron core 2, and the insulating gas 5 must be circulated by utilizing natural convection. Therefore, the seat 8 is installed inside the cover 10 of the tank, the partition plate 9 made of an insulating material is fixed, and a gap is provided between the side wall of the tank 3 and the partition plate 9.
Moreover, the opening of the partition plate 9 is arranged below the winding 1. As a result, the insulating gas 5 flowing into the tank 3 from the pipe 7 flows into the lower portion of the winding 1 through the gap between the side wall of the tank 3 and the partition plate 9. Further, as shown in FIG. 1 (b), both ends of the partition plate 9 are sandwiched by the guide plates 11 fixed to the side walls of the tank 3, so that the insulating gas 5 is kept above the tank 3 at both ends of the partition plate 9. There is no possibility of wrapping around and winding into the space on the winding 1 and iron core 2 side. Generally, between the winding 1 and the tank 3, since the winding 1 has a high voltage,
Although it is necessary to consider the dimension on insulation, it is not necessary to provide an insulation distance between the partition plate 9 and the winding 1 because the partition plate 9 is made of an insulating material. Therefore, the space for taking the necessary dimension for the insulation can be used as a gap between the side wall of the tank 3 and the partition plate 9, so that the dimension of the tank 3 does not increase.

Further, the connection lead 12 of the winding 1 is installed inside the tank 3, and it is necessary to take a dimension necessary for insulation from the wall surface of the tank 3 which is the ground.
If is fixed to the partition plate 9 made of an insulating material, the connection lead 12 can be fixed and the gas flow path can be secured.

The partition plate 9 is not limited to the arrangement as shown in FIG. 1 (b), and if the gap is provided between the tank 3 and the partition plate 9, the arrangement is not particularly limited. Partition plate 9
As for the number of the two, as shown in FIG.
You may arrange | position two or more pieces.

[0010]

As described above, according to the present invention, the insulating gas cooled by the cooling device can be guided to the lower portion of the tank without increasing the size of the tank.

[Brief description of drawings]

1A and 1B show an example of a transformer of the present invention, in which FIG. 1A is a transverse sectional view and FIG. 1B is a plan sectional view.

FIG. 2 is a cross-sectional view showing an example of a conventional transformer.

FIG. 3 is a plan sectional view showing another embodiment of the transformer of the present invention.

[Explanation of symbols]

 1 Winding 2 Iron core 3 Tank 4 Cooling device 5 Insulating gas 6,7 Piping 8 Seat 9 Partition plate 10 Cover 11 Guide plate 12 Connection lead

Claims (1)

[Claims] 1. A partition plate made of an insulating material is installed in the tank along the side wall surface of the tank, and insulating gas returning from the cooling device installed at the upper part of the tank to the tank passes through a gap between the tank side wall and the partition plate. , A gas-insulated transformer characterized in that it is guided to the bottom of the tank.