JPH04286306A - Self-cooling gas-insulated transformer - Google Patents

Abstract

PURPOSE:To reduce the setting plane surface of the entire self-cooling gas- insulated transformer. CONSTITUTION:A radiator 4 is attached to the upper part of a transformer tank 2, and SF 6 gas is circulated by natural convection passing through a piping 5 for ascending gas to a radiator 4 from the upper part of the transformer tank 2 and also passing through a plurality of gas introducing pipes 8, provided in parallel on the inner wall of the transformer tank 2, to the lower part of a transformer winding 1 through a descending gas piping 6 from the radiator 4.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to self-cooled gas insulated transformers.

0002

[Prior Art] A gas insulated transformer is a transformer whose interior is sealed with SF6 gas, which is non-flammable and highly fire-resistant.As a highly disaster-resistant transformer, it is used in densely populated areas and in power receiving and transforming equipment in buildings. Demand is increasing. Also,
As land prices in densely populated areas rise, there is a growing demand for downsizing of power receiving and transforming equipment, and in particular there is a growing demand for gas-insulated transformers that require a small installation space.

A conventional self-cooling gas insulated transformer has a transformer winding 1 wound around a transformer core 3, as shown in FIG.
The heat generated is radiated by a radiator 4 attached to the side wall of the transformer tank 2 via a gas pipe 7. Furthermore, SF6 gas has a lower heat transfer coefficient than insulating oil at a pressure of 0.2 megapascals (2 kilograms per square centimeter) or less, which does not contact the second class pressure vessel. However, SF6 gas has lower heat transfer than insulating oil at pressures below 0.2 megapascals (2 kilograms per square centimeter), which does not conflict with the second class pressure vessel, so in the conventional self-cooled gas insulated transformer mentioned above, In this case, the installation space of the radiator 4 is about twice that of the transformer tank 2, and the installation space of the entire transformer becomes large, which is an inconvenience that makes it unsuitable for installation in a densely populated area or inside a building. be.

0004

[Problems to be Solved by the Invention] Accordingly, the present invention provides a self-cooling gas insulated transformer in which heat generated from the transformer body is radiated from a radiator, which eliminates the need for a plane space for installing the radiator, thereby making it possible to transform the transformer. This allows the installation space of the entire device to be reduced.

[0005]

[Means for Solving the Problems] In the present invention, in a self-cooling gas insulated transformer in which heat generated from a transformer core and transformer windings is radiated from a radiator, the radiator is disposed on the transformer tank. A plurality of gas guide pipes are arranged in parallel along the inner wall of the main body.

[0006]

[Operation] With this configuration, the installation space for the radiator can be omitted, and since multiple gas guide pipes are arranged in parallel along the inner wall of the main body, the gas guide pipes are installed outside the transformer tank. There is no need to provide space for
Installation space can be reduced.

[0007]

[Embodiment] Fig. 1 shows an example of a self-cooling type gas insulated transformer according to the present invention, in which a radiator 4 is connected to the transformer tank 2 by an ascending gas pipe 5 and a descending gas pipe 6 connected to the upper part of the transformer tank 2. Connected. In addition, in order to guide the cooled SF6 gas through the descending gas pipe 6 to the lower part of the transformer winding 1, a plurality of gas guide pipes 8 having a semicircular cross section are arranged in parallel on the inner wall of the side surface of the transformer tank 2. Attach to.

The heated SF6 gas in the transformer winding 1 rises due to natural convection and is sent to the radiator 4 through the rising gas pipe 5 attached to the top of the transformer tank 2, where it is heated. It descends while being cooled. The SF6 gas cooled by the radiator 4 is returned to the transformer tank 2 through the descending gas pipe 6, and further passes through the gas guide pipe 8 attached to the inner side wall of the transformer tank 2 to the transformer winding 1. sent to the bottom of the With this structure, the SF6 gas heated by the transformer winding 1 can be efficiently sent to the radiator 4 by convection, and the SF6 gas cooled by the radiator 4 can
F6 gas can be led to the bottom of the transformer winding 1. In addition, in general, the dielectric strength of SF6 gas is highly dependent on the electric field,
Although it is necessary to avoid placing metal objects with protrusions inside the transformer, the gas guide pipe 8 in this example is semicircular, so electric field concentration is less likely to occur, and as shown in FIG. 1(b), By taking measures such as arranging the guiding gas pipe 8 near between the windings 1, the guiding gas pipe 8 can be installed on the inner side wall of the transformer tank 2 without increasing the installation plane space of the transformer tank 2. be able to. Incidentally, a similar effect can be obtained by providing a gas guide pipe 8 at a corner of the inner wall of the transformer tank 2 as shown in FIG.

[0009]

[Effects of the Invention] According to the present invention, the following effects can be obtained. (1) By installing the radiator above the transformer tank, the planar space for installing the radiator can be omitted. (2) There is no need for a gas guide pipe for the radiator on the outer wall of the side surface of the transformer tank, and the installation planar space for the transformer tank can be reduced.

[Brief explanation of the drawing]

FIG. 1(a) is a sectional view of a self-cooling gas insulated transformer according to an embodiment of the present invention, and FIG. 1(b) is a plan sectional view thereof.

FIG. 2 is a plan view of a self-cooling gas insulated transformer according to another embodiment of the present invention.

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

[Explanation of symbols]

1 Transformer winding 2 Transformer tank 3 Transformer core 4 Heat sink 5 Piping for rising gas 6 Piping for descending gas 8 Gas guide pipe

Claims (1)

[Claims] Claim 1: In a self-cooled gas insulated transformer in which heat generated from the transformer body is radiated from a radiator, the radiator is placed on the transformer tank, and a plurality of gas guide pipes are arranged in parallel along the inner wall of the main body. A self-cooling gas insulated transformer.