JPH1012451A - Terminal device of oil-filled transformer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify a terminal part structure and to eliminate oil disposal work for an elephant chamber at a site after delivery by providing a slip-on type cable head wherein a transformer main body and an external cable are connected to the elephant chamber while air-tight penetration is allowed. SOLUTION: An elephant chamber 3 is provided, like a protruded object, on a side wall of a tank 1 where a transformer main body is housed, with the elephant chamber 3 communicating with the tank 1. To the tank 1, a conservator 8 for the main body and a pressure release device 9 for the main body are attached, and a pressure release piping 12 is connected to it. Meanwhile, at the lower part of the elephant chamber 3, a slip-on type cable head 13 of 3-phase is attached. Relating to the slip-on type cable head 13, a guide tube of cylinder shape, an intermediate bracket and an insulation seat are, in this order, connected in air-tight, and a fixing terminal is attached in air-tight to the open end part of a porcelain tube.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil-filled transformer used in an electric power system, and more particularly to a terminal device thereof.

[0002]

2. Description of the Related Art FIG. 4 is a side view showing a terminal portion of a conventional general oil-filled transformer. A bushing adapter 2 protruding from a side wall of a tank 1 housing the transformer body and an elephant chamber 3
Is provided. Further, the bushing adapter 2 and the elephant chamber 3 are completely airtightly partitioned by a partition plate, and a through bushing 4 penetrating the partition is attached thereto. ing. Further, a cable head 5 is attached to the lower side of the elephant chamber 3 so as to penetrate therethrough. The cable head 5 is connected to the transformer main body through a through bushing 4 by a lead wire 7 inside the elephant chamber 3.

A transformer main body conservator 8 and a transformer main body pressure relief device 9 are installed in the upper part of the tank 1 for the transformer main body tank 1 and the bushing adapter 2. Since the tank 1 and the elephant chamber 3 are partitioned, an elephant chamber conservator 10 and an elephant chamber pressure release device 11 are further provided for the elephant chamber. Pressure relief pipe 12 for both these devices
Are connected to one piece in the middle and are piped downward. This transformer is tested at the factory using a temporary bushing, and after the test is finished, the elephant chamber 13 is drained and transported to the installation destination. After installation, the cable head 5 is mounted on site and the lead wire 7 is connected. Thereafter, insulating oil is injected into the elephant chamber 3. In this terminal portion structure, since the elephant chamber 3 and the tank 1 for the main body form separate chambers, only oil treatment in the elephant chamber 3 is required at the time of cable connection, and there is no need to treat the tank 1 with oil. There is an advantage that there is no fear of moisture absorption due to the transformer body coming into contact with air.

[0004]

The above-mentioned transformer has the following problems. 1. Apart from a conservator and a pressure relief device for the main body, a conservator and a pressure relief device for the elephant room must be additionally installed. 2. Elephant chamber oil treatment is involved in cable connection work after delivery. 3. A through bushing is required at the connection between the bushing adapter and the elephant chamber.

Accordingly, the present invention uses a slip-on type cable head for a connection portion with an external cable, thereby simplifying the structure of the terminal portion, and eliminating the oil treatment work for the elephant chamber 3 on site after delivery. It is an object of the present invention to provide a terminal device for an oil-immersed transformer that can perform the above operations.

[0006]

In the terminal device for an oil-immersed transformer according to the present invention, an elephant chamber communicating with a tank for a transformer main body is protruded, and a slip-on type for connecting an external cable to the elephant chamber. It is characterized in that the cable head is provided airtightly.

[0007] By adopting such a configuration, even if the internal pressure increases due to an internal accident or the like in the elephant room,
It can be prevented by the pressure relief device installed in the tank for the transformer body. Further, since the slip-on type cable head eliminates the need to make the elephant chamber a separate room, the transformer winding and the cable head can be connected without any intervention.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side view of a three-phase oil-immersed transformer provided with the device of the present invention. An elephant chamber 3 is projected from a side wall of a tank 1 housing a transformer main body. It is installed in communication with. The tank 1 is provided with a main body conservator 8 and a main body pressure release device 9 as in the prior art, and is connected to a pressure release pipe 12.

On the other hand, a slip-on type cable head 13 for three phases is mounted below the elephant chamber 3. As shown in FIG. 2, the slip-on type cable head 13 has a tube-shaped guy tube 15 and an intermediate fitting 1.
6 and the insulating seat 17 are air-tightly connected in this order, and a fixed contact 18 is air-tightly mounted at the open end of the insulator tube. On the other hand, the external cable 19 connected to the fixed contact 18
The movable contact 20 is attached to the terminal. A tulip-shaped contact 21 is mounted on the fixed contact 18, and is connected to the movable contact 20 at this portion. 2
2 is the external cable 19 and the insulating seat 17 after the cable connection.
It is a protective fitting that protects the space.

[0010] This slip-on type cable head 13
Is attached to the elephant chamber 3 as shown in FIG. At the transformer manufacturing plant, insulator tube 15, intermediate metal fittings 16,
An assembly of components such as the insulating seat 17, the fixed contact 18, and the tulip-shaped contact 21 is fixed to the elephant chamber 3 by the flange of the intermediate fitting 16, and the transformer body and the fixed contact 18 are connected by the lead wire 14. I do. Then, it is transported to the destination with the insulating oil contained.

At the installation site, the cable 19 to which the movable contact 20 is attached is inserted from below and electrically connected. Then, as shown in FIG. 2, the protection fitting 22 is attached, and the on-site assembly work is completed.

[0012]

As described above, according to the present invention, the elephant chamber can be protected by only the transformer tank conservator and the pressure relief device, and the piping can be simplified. Further, the conventional through bushing can be omitted.

[Brief description of the drawings]

FIG. 1 is a side view of a transformer showing an embodiment of the present invention.

FIG. 2 is a partial sectional view showing an example of a slip-on type cable head used in the present invention.

FIG. 3 is a partial cross-sectional view showing an example of a slip-on type cable head attached to an elephant chamber.

FIG. 4 is a side view of a conventional oil-immersed transformer.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tank 3 Elephant room 8 Conservator for transformer body 9 Pressure relief device for transformer body 13 Slip-on type cable head

Claims (1)

[Claims] 1. An oil-filled transformer having a conservator and a pressure relief device provided in a tank containing a transformer main body, wherein an elephant chamber communicating with the conservator and the pressure relief device protrudes from a side wall of the tank. A terminal device for an oil-filled transformer, characterized in that a slip-on type cable head for connecting a transformer main body and an external cable is provided through the elephant chamber in a gas-tight manner.