JP2552377Y2 - Transformer for gas insulation test - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transformer for a gas insulation test used for, for example, a withstand voltage test of substation equipment.

[0002]

2. Description of the Related Art FIG. 5 shows the structure of a conventional transformer for gas insulation test. The gas insulation test transformer,
As shown in the drawing, a container 2 containing a gas transformer 1 is provided. The gas transformer 1 in the container 2 is insulated with SF ₆ gas. A connection container 4 is placed on the upper opening edge of the container 2 via an insulating spacer 3 and connected by bolting or the like. A porcelain tube 5 is placed on the upper opening edge of the connection container 4 and connected by bolting or the like. Insulator tube 5
Is closed by a terminal plate 6 made of an iron plate or the like. The terminal plate 6 is provided with terminals 6a.

The high voltage shield 7 electrically integrated with the terminal of the secondary coil of the gas transformer 1 and the lower end of the insulating spacer conductor 8 penetrating the center of the insulating spacer 3 are electrically connected by a connection line 9. A shield tube 10 is provided around the connection wire 9.
Is arranged. Both ends of the shield tube 10 are electrically connected to the high-voltage shield 7 and the insulating spacer conductor 8.

[0004] At the upper end of the insulating spacer conductor 8, a shield 11 with a fixing bracket is attached in advance by bolting. At the center of the lower surface of the terminal plate 6, a connecting cylinder 12 having an inner surface threaded is attached in advance by welding. The upper end of the secondary aluminum conductor 13 is screwed and connected to the connecting cylinder 12. The lower end of the secondary aluminum conductor 13 is fitted and connected to the shield 11 with the fixing bracket. Although not shown, the secondary aluminum conductor 13 and the shield 11 with the fixing bracket are fixed in potential by a connection line. In order to alleviate the electric field between the secondary aluminum conductor 13 and the flange portion 5a of the insulator tube 5, a low-pressure shield 14 is disposed, and the flange portion 5a is provided.
It is fixed to.

[0005] Incidentally, 15 is a valve connected to the container 2,
Reference numeral 16 denotes a compound meter connected to the container 2.

[0006]

[Problem to be Solved by the Invention] A gas insulation test transformer having such a structure has no problem when it is installed and fixed in a factory, but when it is moved and used, it is tall and falls down. Worry about. Further, since the transformer for gas insulation test is heavy, there is a problem that the place of use is limited by the lifting capacity of the crane equipment. Furthermore, since the secondary aluminum conductor 13 is heavy and cannot be directly supported by the high-pressure shield 7, there is a problem that the insulating spacer 3 that receives the load of the secondary aluminum conductor 13 is required. Further, there is a problem that a connecting wire 9 and a shield tube 10 are required to connect the insulating spacer conductor 8 and the high-voltage shield 7.

SUMMARY OF THE INVENTION An object of the present invention is to provide a gas insulation test transformer having a simple structure which can be reduced in height and weight.

[0008]

The configuration of the present invention which achieves the above object will be described as follows.

According to a first aspect of the present invention, in the transformer for gas insulation test, a porcelain tube is directly connected to an upper opening edge of a container accommodating a gas transformer, an upper end opening of the porcelain tube is closed by a terminal plate, and the terminal is closed. The plate and the high-pressure shield of the gas transformer are connected by a connection line, and a shield tube is arranged on the outer periphery of the connection line.

According to a second aspect of the present invention, in the transformer for a gas insulation test, a porcelain tube is directly connected to an upper opening edge of a container accommodating a gas transformer, an upper end opening of the porcelain tube is closed with a terminal plate, and the terminal is closed. The plate and the high-pressure shield of the gas transformer are connected by a thin metal tube.

[0011]

When the porcelain tube is directly connected to the upper opening edge of the container accommodating the gas transformer in this way, the connection container conventionally existing between the container and the porcelain tube is eliminated, and the height is reduced.
Therefore, the gas insulation test transformer of the present invention is less likely to fall.

Further, if the connection between the terminal plate and the high voltage shield of the gas transformer is made by a connection line and a shield tube or by a thin metal tube, the weight becomes lighter than that of a conventional secondary aluminum conductor. When such a lightweight connection line is connected to the shield tube or the thin metal tube, the high-pressure shield can bear the weight thereof, and the insulating spacer can be omitted. Therefore,
The gas insulation test transformer of the present invention can be reduced in weight and can be made portable as compared with the conventional one.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. Parts corresponding to those in FIG. 5 described above are denoted by the same reference numerals.

FIG. 1 shows a first embodiment of a transformer for a gas insulation test according to the present invention. In the transformer for a gas insulation test of the present embodiment, the container 2 containing the gas transformer 1
A porcelain tube 5 is placed on the upper opening edge of the container, and the flange portion 5a of the porcelain tube 5 and the container 2 are directly connected by bolting. At the center of the lower surface of the terminal plate 6 that closes the upper end opening of the porcelain tube 5, a connecting cylinder 12 having an inner surface threaded is attached in advance by welding as described above. On the upper surface of the high-pressure shield 7, a shield 11 with a fixing bracket is attached in advance by bolting.

The terminal plate 6 and the high voltage shield 7 are connected to the connection line 1
7 are connected. The upper end of the connection line 17 is
The inside is electrically connected to the terminal plate 6. The lower end of the connection wire 17 is connected to the high-voltage shield 7
Is electrically connected to A shield tube 18 is arranged on the outer periphery of the connection line 17. The upper end of the shield tube 18 is screwed and fixed to the connection tube 12. The lower end of the shield tube 18 is fitted and fixed in the shield 11 with the fixing bracket.

When the porcelain tube 5 is directly connected to the upper opening edge of the container 2 accommodating the gas transformer 1 in this manner, the connection container 4 which has conventionally existed between the container 2 and the porcelain tube 5 is eliminated.
Height decreases. Therefore, the gas insulation test transformer is less likely to fall. When the height is reduced as described above, it is difficult to restrict the height when installing in a factory.

Further, when the connection between the terminal plate 6 and the high-voltage shield 7 of the gas transformer 1 is made by the connection wire 17 and the shield tube 18, the weight is reduced as compared with the conventional secondary aluminum conductor 13.
When such a lightweight connection line 17 and the shield tube 18 are connected, the high pressure shield 7 can bear these weights, and the conventional insulating spacer 3 can be omitted. Therefore,
This gas insulation test transformer can be made smaller and lighter than the conventional one, and can also be made portable. In the case of a portable type, it can be moved freely with the rated gas pressure,
Eliminates the need for auxiliary equipment such as gas cylinders and charge / exhaust devices.
It is economical. Furthermore, a skilled charging / discharging operator is not required.

FIG. 2 shows a specific example of the connection line 17 and the shield tube 18 used in FIG. As the shield cylinder 18, for example, a FRP insulating cylinder whose surface is coated with a conductive paint or a conductive engineering plastic cylinder is used.

FIG. 3 shows a second embodiment of the gas insulation test transformer according to the present invention. In the transformer for gas insulation test of the present embodiment, the means for connecting the terminal plate 6 and the high voltage shield 7 is different from that of the first embodiment. That is, in the present embodiment, the terminal plate 6 and the high-voltage shield 7 are connected by the thin metal tube 19 of 0.5 mm or less. The connection method is the same as the connection method of the shield cylinder 18 of the first embodiment.
In this case, the thin metal tube 19 is connected to the connection line 17 of the first embodiment.
And the shield tube 18. Even if you do this,
The same effects as in the first embodiment can be obtained.

FIGS. 4A and 4B show a third embodiment of the gas insulation test transformer according to the present invention. In the transformer for gas insulation test of the present embodiment, an example is shown in which the thin metal tube 19 and the high-pressure shield 7 are integrated by welding. In this case, the thin metal tube 19 and the high-pressure shield 7 are
It is divided by the split surface 20 and is joined by bolting.

With such a structure, the shield 11 with the fixing fitting required in the second embodiment can be omitted.

It should be noted that a non-ceramic insulator can be used as the insulator 5 used in each of the above embodiments.
In this way, explosion-proof properties can be provided.

[0023]

As described above, in the transformer for gas insulation test according to the present invention, since the porcelain tube is directly connected to the upper opening edge of the container accommodating the gas transformer, there is conventionally no insulator between the container and the porcelain tube. There is no connection container that has been used, and the height can be reduced. Therefore, the gas insulation test transformer of the present invention has an advantage that it is difficult to fall down and is not easily restricted by its height when installed in a factory.

Further, since the connection between the terminal plate and the high voltage shield of the gas transformer is made by a connection line and a shield tube or by a thin metal tube, it is lighter than a conventional secondary aluminum conductor. The weight burden can be made directly by the high-pressure shield, and the insulating spacer can be omitted. Therefore, the gas insulation test transformer of the present invention can be made smaller and lighter than a conventional one, and can be made portable. In the case of a portable type, since it can move freely with the rated gas pressure, there is no need for ancillary equipment such as a gas cylinder and a charging / discharging device, and it is economical. Further, there is an advantage that a skilled charge / discharge operator is not required.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a first embodiment of a gas insulation test transformer according to the present invention.

FIG. 2 is a perspective view showing an example of a connection line and a shield tube used in the present embodiment.

FIG. 3 is a vertical sectional view showing a second embodiment of the gas insulation test transformer according to the present invention.

FIGS. 4A and 4B are a front view and a side view showing a relationship between a thin metal tube and a high-pressure shield used in a third embodiment of the gas insulation test transformer according to the present invention.

FIG. 5 is a longitudinal sectional view showing a conventional gas insulation test transformer.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... gas transformer, 2 ... container, 3 ... insulating spacer, 4 ...
Connection container, 5: insulator tube, 6: terminal plate, 7: high-pressure shield,
8 ... insulating spacer conductor, 9 ... connection wire, 10 ... shield tube, 11 ... shield with fixing bracket, 12 ... connection tube, 13
... Secondary aluminum conductor, 14 ... Low pressure shield, 17 ... Connection line, 18 ... Shield cylinder, 19 ... Thin metal cylinder, 20 ... Split face.

Claims (2)

(57) [Scope of request for utility model registration] An insulator tube is directly connected to an upper opening edge of a container accommodating a gas transformer, an upper end opening of the insulator tube is closed by a terminal plate, and a connection line is formed between the terminal plate and a high-pressure shield of the gas transformer. Wherein a shield tube is disposed on the outer periphery of the connection line. 2. A porcelain tube is directly connected to an upper opening edge of a container accommodating a gas transformer, an upper end opening of the porcelain tube is closed by a terminal plate, and the terminal plate and a high-pressure shield of the gas transformer are made of thin metal. A gas insulation test transformer, which is connected by a tube.