JPH0963855A - Tank for oil-immersed electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the height of a tank and the cost by reducing the gas space provided at the upper part of the tank in order to suppress fluctuation of inner pressure of the hermetically sealed tank without modifying the allowance of inner pressure variation. SOLUTION: Enclosed spaces, i.e., spaces 150, 160 for reinforcing member, defined by reinforcing members 15, 16 mounted on the side face of a tank 1 and the side wall of the tank 1 communicate with a gas space 42 at the upper part of the tank 1 through the piping 31A for a pressure gauge 3 measuring the pressure in the gas space 42 and pipings 32, 33. Consequently, the volume of spaces 150, 160 for reinforcing member is added to the volume of gas space 42 thus contributing to suppression of inner pressure variation and thereby the volume of gas space 42 can be decreased.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a container for an oil-filled electric transformer such as an oil-filled transformer or an oil-filled reactor, and in particular, a gas space is provided in the upper part of the container to seal the container and mitigate internal pressure changes. The present invention relates to a container for an oil-filled electric device.

[0002]

2. Description of the Related Art FIG. 3 is a front view including a sectional view of a conventional oil-filled transformer. In this figure, the left side is shown in a cross-sectional view with the center line indicated by the alternate long and short dash line as the boundary. Container 1 is 10 mm
It is composed of a lower container 11 and an upper container 12 made of front and rear steel plates, and the contents 2 of a transformer mainly composed of an iron core 21 and a winding 22 are housed in this container 1 and also serve as an insulating medium and a cooling medium. The insulating oil 41 is injected to a depth covering the contents 2, and a gas space 42 in which nitrogen gas is enclosed is provided in the space above the insulating oil 41.

The upper container 12 is provided with a pipe 31 on the left side of the drawing, and a pressure gauge 3 is attached to the tip of the pipe 31. The pressure gauge 3 communicates with a gas space 42. The gas pressure inside the container 1 can be visually confirmed. The reason why the position of the pressure gauge 3 is brought downward by the pipe 31 is to lower the pressure gauge 3 to a position where it can be easily visually recognized by an inspector. The size of the container 1 is roughly estimated from the height position of the pressure gauge.

A pressure relief pipe 13 is provided on the right side of the drawing. For example, a pressure relief device provided inside the pressure relief pipe 13 when an abnormality occurs inside the container 1 and the internal pressure becomes excessive. By working, the airtightness is broken and the nitrogen gas in the gas space 42 is released to the outside. When the pressure relief pipe 13 is normal, airtightness is maintained, and when the temperature of the insulating oil 41 rises and expands, the nitrogen gas is compressed by the volume expansion, the volume of the gas space 42 decreases, and the pressure rises. Therefore, if the volume of the gas space 42 is small, the change in internal pressure due to temperature change is large, and if the volume is large, the change is small.

Nitrogen gas is enclosed in order to prevent the deterioration of the insulating oil 41 due to oxygen and moisture contained in the air, and the sealing is the simplest in order to prevent these from entering from the outside. Because it is a structure. Upper container 12
The lower container 11 and the lower container 11 are kept airtight by the unmarked flange portion which is a connecting portion between them and the unmarked packing provided therein.

Although the internal pressure changes due to the temperature change of the insulating oil 41, the container 1 is damaged if the internal pressure rises excessively. Therefore, the container 1 is manufactured so that the strength of the container 1 can sufficiently withstand the increase in the internal pressure due to only the temperature change. Of course, increasing the permissible internal pressure value increases the mechanical strength of the container 1 and thus increases the cost of the container 1. On the other hand, in order to set the permissible internal pressure value small, the volume of the gas space 42 must be reduced. Must be increased, that is, the height of the container 1 must be increased, which also increases the cost of the container 1.
Therefore, considering these factors, conditions are set such that the cost of the container 1 and related members is minimized.

Two reinforcement members 1 are provided on the side surface of the lower container 11.
5 and 16 are provided horizontally, and the upper container 12 is provided with two upper surface reinforcing members 17 and 18 in the left-right direction of the drawing.
The upper surface reinforcing material 18 is on the opposite side of the upper surface reinforcing material 17 in front and is not actually visible. In the cross-sectional view shown on the left side of the figure, the wall of the container 1 is simply shown by a solid line, but in actuality, as shown in the cross-sectional view in which only the thickness of the wall of the side surface reinforcing member 15 is enlarged to the portion A of the chain line It has a certain thickness, the cross-sectional shape of the side surface reinforcing member 15 is U-shaped, and a space having a rectangular cross section is formed together with the wall surface of the lower container 11. Here, this space will be referred to as a reinforcing material space 150. Similarly, reinforcing material spaces 160, 170 and 180 are formed in the side surface reinforcing material 16 and the upper surface reinforcing materials 17 and 18, respectively.

FIG. 4 is a side view of the oil-filled transformer of FIG.
The same members as those shown in FIG. In addition, the piping 31, the pressure gauge 3, and the pressure release pipe 13 shown in FIG. 3 are omitted. Also in this case, the content 2 in the sectional view on the left side is merely a side view. In this figure, the upper container 12 is provided with two upper surface reinforcing members 17 and 18 which are distributed to the left and right of the drawing, and in the case of the upper surface reinforcing member 17, a reinforcing material space 170 is shown.

[0009]

As described above, the volume of the nitrogen gas 42 needs to have a predetermined size in proportion to the insulating oil 41 in order to suppress the change in internal pressure to a predetermined value or less. There is a problem that the larger the volume of the nitrogen gas 42, the larger the height dimension of the container 1 and the higher the cost of the container 1.

An object of the present invention is to solve the above problems and to provide a container of an oil-filled electric charger which can reduce the height dimension of the container as much as possible when the volume of the gas space is fixed to reduce the cost. To provide.

[0011]

In order to solve the above-mentioned problems, according to the present invention, a gas space is provided above the insulating oil sealed in the container, and the reinforcing material provided on the outer surface of the container is a container. In the container of the oil-filled electric device in which the reinforcing material space as a space shielded from the outside air is formed together with the wall, the reinforcing material space is communicated with the gas space. In the above structure, the reinforcing material is a side surface reinforcing material provided on the side surface of the container, and the reinforcing material space formed by the side surface reinforcing material and the gas space above the container may be in communication with each other. . Further, the side reinforcement space and the gas space of the container are connected by a pipe arranged outside the container, and a part of this pipe is common with the pipe of a pressure gauge for measuring the pressure of the gas space. Good to do. Further, the reinforcing material may be an upper surface reinforcing material provided on the upper surface of the container, and a through hole may be provided in the container wall that constitutes the reinforcing material space together with the reinforcing material.

[0012]

In the structure of the present invention, the volume of the reinforcing material space is added to the volume of the gas space by communicating the reinforcing material space with the gas space of the upper part of the container, and contributes to the suppression of the internal pressure change. Therefore, when the volume of the required gas space is fixed, the volume of the gas space in the container 1 can be reduced by the volume of the reinforcing material space.

Further, the reinforcing material is a side surface reinforcing material provided on the side surface of the container, and if the reinforcing material space formed by the side surface reinforcing material and the gas space above the container are communicated with each other, the reinforcing material space is provided inside the container. It is added to the gas space and contributes to the suppression of internal pressure changes. Also, if the side reinforcement space and the gas space of the container are connected by a pipe, and if part of this pipe is common with the pipe of a pressure gauge for measuring the pressure of the gas space, the container itself will be a conventional one. The same can be used, and the piping of the pressure gauge can be effectively used.

Further, the reinforcing material is an upper surface reinforcing material provided on the upper surface of the container, and if a through hole is provided in a portion of the upper container which forms a reinforcing material space together with the reinforcing material on the upper surface of the container, a through hole is formed in the upper container. Since the bottom is a gas space, simply by opening a through hole, the reinforcing material space and the gas space inside the container can easily communicate,
This reinforcing material space contributes to suppression of internal pressure change.

[0015]

EXAMPLES The present invention will be described below based on examples.
FIG. 1 is a front view including a sectional view of an oil-filled transformer showing a first embodiment of the present invention. The same members as those in FIG. In this figure, the reinforcing material space 150, which is the internal space of the side surface reinforcing material 15, is connected to the piping 31A of the pressure gauge 3 by the piping 32.
And the reinforcing material space 160 formed by the reinforcing material 16 between the pipe 33
It is connected with. Since the pipe 31A communicates with the gas space 42 of the container 1, as described above, the pipes 32, 33
As a result, the reinforcing material spaces 150, 1
Both 60 are in communication with the gas space 42. If the pressure of the gas space 42 changes, the pipes 31A, 32, 33
Through which the pressure in the reinforcement spaces 150, 160 also changes,
In other words, the reinforcing material spaces 150 and 160 serve as spaces that serve the same function as the gas space 42 and contribute to alleviation of changes in the internal pressure of the container 1. If the same allowable internal pressure rise value is reached, the reinforcement material space 150
Therefore, the volume of the gas space 42 may be reduced by a volume corresponding to the sum of the volumes of the reinforcing material space 160 and the reinforcing material space 160. Therefore, the height of the container 1 can be reduced accordingly.

The reinforcing material spaces 150 and 160 are replaced by the gas space 42.
There are various configurations other than that shown in FIG. For example,
A configuration in which the reinforcing material spaces 150 and 160 are separately or serially connected to the gas space 42 separately from the pipe 31A, and a configuration in which a pipe is provided inside the container 1 to avoid the insulating oil 41 and to communicate with each other are also conceivable. . This structure is not limited to such a structure for communication, and any structure can be adopted within the range not deviating from the object of the present invention.

FIG. 2 is a side view including a cross-sectional view of an oil-filled transformer showing a second embodiment of the present invention. The same members as those in FIG. 4 are designated by the same reference numerals and duplicate description will be omitted. In this figure, a through hole 34 is provided to connect the reinforcing material space 170 which is a space in the upper surface reinforcing material 17 for reinforcing the upper container 12 and the gas space 42 in the upper part of the container 1. The same applies to the reinforcing material space 180 (not shown) of the upper surface reinforcing material 18. Since the temperature change of the insulating oil 41 is slow, the internal pressure change of the container 1 is also slow, and therefore the diameter of the through hole 34 may be small. Therefore, it is considered that the mechanical strength of the upper container 12 is hardly affected. Good.

By providing the through holes 34, the volume of the reinforcing material spaces 170, 180 is reduced by the reinforcing material spaces 150, 1 of FIG.
Like 60, it is added to the volume of the gas space 42 and contributes to the suppression of changes in the internal pressure of the container 1. Therefore, the height of the container 1 can be reduced by reducing the volume of the gas space 42 by the sum of the volumes of the reinforcing material spaces 170 and 180.

Since the first embodiment shown in FIG. 1 and the second embodiment shown in FIG. 2 are applied to different reinforcing materials, both of them can be carried out simultaneously. That is, the reinforcing material 15,
Reinforcing material spaces 150, 16 of 16, 17, 18 respectively
By connecting all of 0, 170, and 180 with the gas space 42 above the container 1 as described above, the volume of these reinforcing material spaces is increased by the volume equivalent to the total volume of the gas space 4.
Since the volume of 2 can be reduced, the height dimension of the container 1 can be reduced accordingly, and the cost of the container 1 can be reduced.

The reinforcing materials 15, 16, 17 and 18 of the conventional oil-filled electric vessel container shown in FIGS. 3 and 4 are all U-shaped steel materials in which a reinforcing material space is formed. However, the cross-sectional shape of the reinforcing material to which the present invention is applicable is not limited to the U-shape. For example, since the reinforcing material space is formed even when the reinforcing material has a U-shaped cross section, the present invention is applicable.

Even when the reinforcing material has a U-shaped cross section, a reinforcing material space is formed and a surface perpendicular to the wall surface of the container 1 is formed as in the case of the U-shape. Since it serves as a reinforcing material, it is suitable as a reinforcing material because it can have sufficient resistance to a force in a direction perpendicular to the wall surface of the container 1. On the other hand, as the cross-sectional shape of the reinforcing material, a plate, an L-shape, a T-shape or the like may be appropriately used, but since the reinforcing material space is not formed in these, the present invention cannot be applied. If the present invention is applied to the case where a conventional reinforcing material in which a reinforcing material space is not formed is adopted, it is possible to use a reinforcing material such as a U-shaped cross section in which the reinforcing material space is formed. Good.

[0022]

As described above, according to the present invention, by connecting the space formed by the reinforcing material and the container wall, that is, the reinforcing material space to the gas space above the container, the volume of the reinforcing material space is reduced to that of the gas space. It is added to the volume and contributes to suppressing the internal pressure of the container. Therefore, the volume of the gas space in the container can be reduced by the volume of the added reinforcing material space. As a result, the height dimension of the container can be reduced, so that the cost of the container can be reduced, the restrictions on the transportation limit of the container of the oil-filled battery can be relaxed, and the transportation cost can be reduced.

Further, the reinforcing material utilizing the reinforcing material space is a side surface reinforcing material provided on the side surface of the container, and if the reinforcing material space of the side surface reinforcing material and the gas space above the container are communicated with each other, this reinforcing material space is formed. Is added to the gas space in the container. in this case,
If the reinforcing material space and the gas space of the container are connected by a pipe, and part of this pipe is also used as the pressure gauge pipe for measuring the pressure of the gas space, the container itself may be the same as the conventional one. Moreover, since the pipe of the pressure gauge can be effectively used, there is an effect that the implementation is easy.

Further, the reinforcing material utilizing the reinforcing material space is an upper surface reinforcing material provided on the upper surface of the container, and if a through hole is provided in a portion of the upper container forming this reinforcing material space, the lower part of the upper container is Since it is a gas space, this through hole communicates the gas space and the reinforcing material space with each other, so that the same effect as described above can be obtained, and since the present invention can be carried out only by adding processing to provide the through hole, its implementation is easy. is there.

[Brief description of drawings]

FIG. 1 is a front view including a sectional view of an oil-filled transformer showing a first embodiment of the present invention.

FIG. 2 is a side view including a sectional view of an oil-filled transformer showing a second embodiment of the present invention.

FIG. 3 is a front view including a cross-sectional view of a conventional oil-filled transformer.

FIG. 4 is a side view including a cross-sectional view of a conventional oil-filled transformer.

[Explanation of symbols]

1 ... Container, 11 ... Lower container, 12 ... Upper container, 2 ... Contents, 3 ... Pressure gauge, 31, 31A, 32, 33 ... Piping, 3
4 ... Through hole, 15, 16 ... Side reinforcement, 17, 18 ... Top reinforcement, 150, 160, 170, 180 ... Reinforcement space, 41 ... Insulating oil, 42 ... Gas space

Claims (4)

[Claims] 1. An oil in which a gas space is provided above insulating oil sealed in a container, and a reinforcing material provided on an outer surface of the container forms a reinforcing material space as a space shielded from the outside air together with the container wall. The container of an oil-filled battery device, wherein the reinforcing material space is in communication with the gas space. 2. The reinforcing material is a side surface reinforcing material provided on the side surface of the container, and the reinforcing material space formed by the side surface reinforcing material is connected to the gas space above the container. Item 1. The container of the oil-filled electric device according to item 1. 3. The side reinforcing material space and the gas space of the container are connected by a pipe arranged outside the container, and a part of this pipe is common with the pipe of a pressure gauge for measuring the pressure of the gas space. The oil-filled container of claim 2, wherein the container is an oil-filled container. 4. The reinforcing material is an upper surface reinforcing material provided on the upper surface of the container, and a through hole is provided in a container wall which forms a reinforcing material space together with the reinforcing material. Oil-filled container described.