JPH062644U - Gas insulated transformer - Google Patents

Abstract

(57) [Summary] [Purpose] To reduce costs and improve airtightness by reducing the number of parts of gas-insulated transformers. [Structure] The tank body 101 and the cover 104 are provided with a protruding portion 1.
Butt at 02 to join the outermost periphery of the protrusion 102. Since the protrusion 102 is provided with the notch 103, the short side 105
And the long side 106.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

The present invention relates to a gas-insulated transformer in which a transformer body including an iron core and a coil is housed in a tank filled with an insulating gas body such as SF ₆ .

[0002]

[Prior art]

 As shown in FIGS. 4 and 5, a conventional gas-insulated transformer has a glass plate 503 and a packing between a flange 501 and a holding plate 502 having a hollowed-out center, on a side plate portion of an upper portion of a cover 401 or a tank body 402. A dedicated pressure release device 403 with 504 interposed was provided.

[0003]

[Problems to be solved by the device]

 The conventional pressure-release structure of the gas-insulated transformer has the following drawbacks. (1) Since it is difficult to directly attach a pressure-release plate such as a glass plate 503 to the cover 401 as shown in FIG. 5, it is necessary to provide the flange 501, the holding plate 502, and the packing 504, etc. Therefore, the number of parts increases. (2) In order to ensure airtightness, a part of the flange 501 in FIG. 5 is machined, and the number of processing steps such as drilling for attaching the flange 501 to the cover 401 increases. (3) The number of places where airtightness needs to be secured increases, such as the pressure plate mounting portion of the glass plate 503 of FIG. 5 and the flange 501 mounting portion. The present invention provides a simple pressure release structure having the same performance as the conventional structure.

[0004]

[Means for Solving the Problems]

 In the present invention, the tank main body and the cover are provided with an outwardly projecting portion having short sides and long sides, the projecting portions of the tank body and the cover are butted, and the outermost periphery of the butted portion is joined.

[0005]

[Action]

 With the above configuration, even if an internal accident occurs in the transformer body and a sudden increase in internal pressure occurs, the stress on the joint differs due to the provision of the short side and the long side on the protrusion. It is possible to release the pressure by opening a specific part. In addition, the cover is not scattered because a specific part is open, so it is safe.

[0006]

【Example】

 Hereinafter, an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a block diagram of an embodiment of the present invention using a cylindrical tank. A cylindrical tank body 101 is provided with a protruding portion 102 protruding in a circular shape to the outside, and the protruding portion 102 is further provided. In the same manner as the tank body 101, the tank main body 101 having the rectangular cutout 103 is provided with a cap-shaped cover 104 having a rectangular cutout 103 formed in the protruding portion 102, and the protruding portion 102 is butted. Then, the outermost circumference of the protrusion 102 is joined. The protrusion 102 has a long side 106 and a short side 105 due to the notch 103. FIG. 2 is a configuration diagram of another embodiment of the present invention in which the short side 105 and the long side 106 are formed by forming the outermost peripheral portion of the protrusion 102 of FIG. 1 into an elliptical shape. FIG. 3 is a block diagram of another embodiment of the present invention using a square tank, in which a projecting portion 302 protruding outward is provided on the upper portion of a square tank body 301, and the projecting portion 302 has the tank side faces facing each other. By changing the projecting dimension from the surface other than the one that faces the projecting section with the same projecting dimension, the tank body 301 having the short side 105 and the long side 106, and the projecting section 302 in the same manner as the tank body 301 are formed. The applied cover 303 is put on the protruding portion 302 of the tank main body 301 in a butting manner, and the outermost periphery of the protruding portion 302 is joined.

[0007]

[Effect of device]

 As described above, according to the present invention, since the cover and the pressure relief device can be used in common, a dedicated pressure relief device is not required, and the number of parts can be reduced. Can be achieved. Further, since it is not necessary to attach a dedicated pressure relief device, the number of places where there is a concern of airtight leakage, such as the flange attachment part and pressure relief plate attachment part of the pressure relief device, can be reduced, thus improving the airtightness.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a block diagram showing another embodiment of the present invention.

FIG. 3 is a block diagram showing another embodiment of the present invention.

FIG. 4 is a configuration diagram that has been conventionally implemented.

FIG. 5 is a cross-sectional view of a conventional pressure relief device.

[Explanation of symbols]

 101 Tank Main Body 102 Projection 103 Notch 104 Cover 105 Short Side 106 Long Side 301 Tank Main Body 302 Projection 303 Cover 401 Cover 402 Tank Main Body 501 Flange 502 Presser Plate 503 Glass Plate 504 Packing

Claims (1)

[Scope of utility model registration request] 1. A gas-insulated transformer in which a transformer main body including an iron core and a coil is housed in a tank main body filled with insulating gas, and the tank main body and a cover maintain airtightness, wherein the tank main body or the cover is provided. A gas-insulated transformer in which an external protruding portion having short sides and long sides is provided, the protruding portions are butted, and the outermost periphery of the butted portion is joined.