JP3102594U - Insulated oil storage tank - Google Patents

Abstract

[PROBLEMS] To provide an insulating oil storage that can be easily received at low cost and easily installed in existing transformers, while having a simple structure, receiving the discharged insulating oil in a tank without scattering the oil around, and quickly storing and storing the oil. Provide a tank.
A first space (12) having an inlet (12a) for receiving a falling flow into a tank without being scattered outside, and an orifice (2) provided at a position communicating with a second space (13) adjacent to the first space. , And a ventilation hole 13a provided in the second space. In addition, such orifices are provided in a plurality of stages in the flow direction, and the orifices are formed as one or many openings formed in the width direction from the bottom surface 11 of the first space to a predetermined height. The opening of the orifice may be a slit, a circle, an oval, an ellipse, a polygon, or a combination thereof. Further, the current plate 31 is arranged in one or both of the first space and the second space.
[Selection] Figure 2

Description

  The present invention relates to an insulating oil storage tank for storing electrical equipment in an internal storage container and for storing insulating oil discharged from the transformer equipment to the outside due to an accident or the like in a transformer facility filled with insulating oil.

The structure of a large-sized (for example, 4 to 12 m ³ ) transformer facility installed in a substation facility has a structure in which electric devices including coils, cores, and the like are arranged in a large space storage container arranged therein. The general structure is to fill these with insulating oil or to fill a predetermined gas if necessary.

  By the way, in such large-scale transformers, for example, when an accident involving arc discharge occurs due to an earthquake such as an earthquake or a human operation error, the internal pressure of the storage container is rapidly increased due to generation of gas. In some cases, leading to destruction of housed electrical equipment. Therefore, assuming that such an accident occurs, as a means for avoiding such a crisis, a predetermined amount of insulating oil is discharged from the inside of the storage container to the outside and / or the gas pressure is reduced. Pressure relief device was installed.

  The above accidents are rare cases (once or not in a few years), but conventionally, the insulating oil discharged by the pressure relief device drips onto the installation surface and permeates the ground. In such a case, an open type oil receiving tank having a capacity capable of receiving a discharge flow of a predetermined amount of insulating oil has been constructed by leaving it in a state of being left or excavating around the pressure relief device.

In some cases, a spare tank for storing discharged insulating oil is provided as an additional facility inside the transformer in addition to the storage container (for example, see Patent Document 1).
JP-A-2000-21645 (pages 2-3, FIG. 1)

  However, insulating oils often contain substances that have an adverse effect on the surrounding environment and the human body, and in the past, PCBs that were widely used because of their excellent heat resistance and electrical insulation properties were used. (Polychlorinated biphenyl) has been banned from production and use because it is highly toxic to the human body and easily accumulates in natural substances and living organisms. Therefore, careful consideration was required for its storage and handling, especially for its diffusion into the surrounding environment. From this, there is a problem in that the insulating oil is made to flow down and is stored in a simple open-type oil receiving tank.

  In addition, even when a storage reserve tank is provided inside the transformer, it is difficult to arrange the storage tank inside the existing pressure relief device due to its location and the piping route for it. It is desirable to design a dedicated device from the beginning and make it an indispensable accessory of the pressure relief device.However, as mentioned above, assuming a rare case and obliging the installation of such a spare tank, the cost of the transformer will increase. In terms of the cost-effectiveness of the invitation, it was not a good idea.

  Therefore, the present invention solves the above-mentioned problem, and allows the discharged insulating oil to be quickly stored and settled without being scattered to the surroundings, and to be easily installed on existing transformer equipment at a low cost, with a simple structure. A possible insulating oil storage tank is provided.

  In order to solve the above problems, an insulating oil storage tank according to the present invention is configured as follows.

  That is, the first space (12) having the inflow port (12a) for receiving the falling flow into the tank without scattering to the outside, the first space (12) and the second space (13) adjacent to the first space (12). It is characterized by comprising an orifice (2) provided at a communicating position and a vent (13a) provided in the second space (13).

  Further, such orifices (2, 3) are provided in a plurality of stages in the flow direction, and the orifices (2) are arranged in the width direction from the bottom surface (11) of the first space (12) to a predetermined height. Or one or a plurality of openings formed in the opening.

  Furthermore, the opening of the orifice (2) is characterized in that it is any one of a slit (5a), a circle (5b), an oval, an ellipse, a polygon, or a combination thereof (5c).

  In addition, a rectifying plate (31) is arranged in one or both of the first space (12) and the second space (13).

  In addition, the reference numerals in parentheses described in the documents of the utility model registration claim and in the section of the means for solving the above-mentioned problem are those with drawing symbols added for reference to facilitate understanding of the configuration of the invention, Of course, the present invention is not limited to the form on the drawing.

  Since the insulating oil storage tank of the present invention is configured as described above, the following effects can be obtained.

  That is, since the inside of the tank is separated into the first space and the second space, and the orifice communicating with both spaces is provided, even if a large amount and abruptly insulative oil is discharged from the transformer, the inside of the tank can be reliably maintained. And the insulating oil can be allowed to stand still, and it is possible to prevent the insulating oil from scattering to the outside from the vent provided in the second space.

  In addition, the opening shape of the orifice may be a simple rectangular opening formed by a rectifying plate forming the first space and the second space in the tank and a bottom surface of the tank, and provided at the lower end side of the rectifying plate if necessary. Slits, circles, ellipses, ellipses, polygons, or any combination of these may be appropriately selected and provided, so that the insulating oil storage tank should be configured with a simpler structure. Becomes possible.

  Further, by providing the inflow port in the first space, it is possible to easily connect to the pressure relief device of the existing transformer by using a flange.

  Hereinafter, the best mode for carrying out the present invention in an insulating oil storage tank (hereinafter, abbreviated as “tank”) will be described in detail with reference to the drawings.

  FIG. 1 is a partially cutaway perspective view showing the overall appearance of the tank of the first embodiment and the arrangement of the tank with respect to the transformer, and FIG. 2 is a partially cutaway perspective view showing the tank of the first embodiment.

  As shown in FIG. 1, the tank 1 of this embodiment is installed on a base surface of a base B on which a transformer T is installed, and is provided at a predetermined interval by a leg seat 14 made of an angle material provided at a lower end side. In addition to being fixedly installed in a floating manner, it is disposed near the lower end of a pressure-release tube P having an open lower end, which is attached substantially downward from the pressure-release device to the vicinity of the foundation B. Note that the interval of floating from the leg seat 14 is set so that a drain pipe 15 described later does not interfere with the foundation B.

  The tank 1 is formed of a stainless steel material, and is formed in a rectangular sealed container shape having a volume of an internal space capable of sufficiently storing an emergency discharge insulating oil amount set in advance according to the type of each transformer T. .

  As shown in FIG. 2, in the internal space of the tank 1, a plate-shaped straightening plate 21 is disposed so as to hang down from the inner top surface so as to partition the space into two sections. An orifice 2 (first orifice) is formed at the lower end of the current plate 21 by disposing the lower edge thereof at a predetermined distance above the bottom surface 11 inside the tank 1. By arranging the current plate 21, the internal space of the tank 1 is divided into a first space 12 and a second space 13, and the two spaces 12 and 13 are communicated via the orifice 2.

  On the top side of the tank 1, an inlet 12a communicating with the first space and a vent 13a communicating the outside with the second space 13 are formed. The inflow port 12a rises cylindrically from the top surface of the tank 1 at a slight height, and has a flange 12b formed at the upper end thereof. The flange 12b is connected to the pressure relief pipe P via a loose flange F disposed on the upper surface thereof. This ensures that a part of the falling flow does not scatter outside, and that the loose flange F absorbs the vertical movement between the tank 1 and the pressure relief pipe P.

  On the other hand, a vent 13a is provided in an opening which is raised in a rectangular shape at a slight height from the top surface of the tank 1 and has a detachable cover for securing ventilation and preventing invasion from the outside such as rain and insects. 13b. In addition, an oil amount confirmation window 4 for confirming the oil storage amount is provided on a side surface of the tank 1.

  On the outer surface of the bottom surface 11 corresponding to the second space 13, a half-split drain pipe 15 is attached so as to traverse the short direction of the bottom surface 11, and both end openings projecting to the side surface of the tank 1 are provided. Are each provided with a valve 15b. The pipe of the drain pipe 15 communicates with the inside of the tank 1 by two discharge ports 15 a opened on the bottom surface 11 of the second space 13. Since the drain pipe 15 is fixed so as to cross the short side of the bottom surface 11, it also plays a role of reinforcing the bottom surface 11 of the tank 1.

  Next, an auxiliary rectifying plate 31 having a second orifice 3 is attached to the second space 13 side with the lower end edge thereof separated from the bottom surface 11 by a predetermined height, similarly to the arrangement of the rectifying plate 21 described above. ing. The auxiliary rectifying plate 31 is selectively provided in consideration of the amount of insulating oil to be stored and the speed of the falling flow, and usually has an opening area larger than the opening formed by the first orifice 2. I have. Further, although not shown, the first space 12 and / or the second space 13 may be provided in each of the first space 12 and / or the second space 13, and a plurality of sheets may be appropriately arranged in parallel.

  By providing the straightening plate 21 and the first orifice 2 in this manner, a large amount of the falling flow from the inflow port 12a flows into the first space 12 abruptly and becomes a jet state, but this state is prevented by the straightening plate 21. As a result, it occurs only in the first space 12. The flow rate to the second space 13 is controlled by the first orifice 2 having a lateral opening formed between the lower end edge of the current plate 21 and the bottom surface 11 of the tank 1, and the flow line of the falling flow is reduced. The abrupt change from the vertical direction to the substantially right-angle direction causes a loss of kinetic energy, and the insulating oil that has moved to the second space 13 is reduced in its momentum and becomes a relatively gentle flow or oil surface to form the second oil. It will stay in the space 13. In other words, the insulating oil which has been supplied to the first space 12 by the falling flow and has a jet flow or a turbulent flow state has its kinetic energy weakened through the first orifice 2 until the oil level in both spaces is balanced. It continues to move to the space 13 and quickly becomes a still water state.

  When the auxiliary rectifying plates 31 are provided, these also function to suppress the momentum of the flow velocity, so that it is possible to expect a gentler flow and an oil surface to be formed more quickly. The auxiliary rectifying plate 31 can be regarded as a so-called breakwater, which suppresses the disturbance of the oil level immediately below the ventilation port 13a. As described above, the auxiliary rectifying plate 31 can be omitted. However, if necessary, the auxiliary rectifying plate 31 is also disposed in the first space 12 so as to limit the flow rate of the insulating oil immediately after flowing into the tank. Is also good.

  The insulating oil stored in the tank may be discharged to the outside through the drain pipe 15 from the discharge port 15a on the second space 13 side by opening the valve 15b, and the detachable ventilation port 13a The cover 13b may be removed, and a suction pipe or the like (not shown) may be inserted from here to suck out the stored oil.

  Furthermore, when the opening edge of the first orifice 2 is formed so as to include the bottom surface 11 of the continuous first space 12 and second space 13, the condensed water accumulated inside travels along the bottom surface and either one of the two spaces. And the condensed water in both spaces can be discharged by one drain pipe 15.

  In the first embodiment described above, the opening of the first orifice 2 formed by the current plate 21 is simply rectangular, but the present invention is not limited to this.

  That is, as shown in FIG. 3, the opening shape is (a) a slit 5a, (b) a circular shape 5b, (c) a combination 5c of a slit and a circular shape, or an ellipse, an ellipse, a polygon, a star, etc. , Etc., may be used alone or in a combination of several types.

  For example, if a slit, a circle, or a polygon is used, the area of the opening becomes smaller, so that the flow rate is increased but the flow velocity is increased as compared with the first embodiment. If the shape is an oval or an ellipse, the flow rate is reduced but the flow velocity is reduced. If the slit and the circular combination are used, the flow rate restriction and the flow velocity are more appropriate than those in other cases, but the production cost is slightly increased.

  Furthermore, when the area of the opening is variously set, even at the same horizontal position, the flow velocity spouted from there is different, and it is made to act in the direction of colliding in the second space 13 and canceling each other, so that it is quick. Hydrostaticization can be promoted.

  As described above, since the operation differs depending on the type, the selection may be made in consideration of various conditions such as the amount of insulating oil released depending on the type of the transformer T.

FIG. 2 is a partially cutaway perspective view showing the overall appearance of the tank of Example 1 and the arrangement of the tank with respect to the transformer equipment. FIG. 2 is a partially cutaway perspective view showing the tank according to the first embodiment. It is a perspective view (a), (b), (c) with a partial cutout which shows the orifice of Example 2.

Explanation of reference numerals

DESCRIPTION OF SYMBOLS 1 Tank 11 Bottom surface 12 1st space 12a Inflow port 12b Flange 13 2nd space 13a Vent 13b Cover 14 Leg seat 15 Drain pipe 15a Outlet 15b Valve 2 1st orifice (Example 1)
21 Rectifier Plate 3 Second Orifice 31 Auxiliary Rectifier Plate 4 Oil Level Check Window 5a Slit (First Orifice of Second Embodiment)
5b circular shape (first orifice of Example 2)
5c Slit, circular combination (first orifice of Example 2)
B Foundation F Loose flange T Transformer P Relief pipe

Claims (5)

An insulating oil storage tank for receiving a falling flow of insulating oil from inside an oil-immersed transformer (T),
A first space (12) having an inlet (12a) for receiving the falling flow into the tank without scattering to the outside;
An orifice (2) provided at a position communicating the first space (12) and a second space (13) adjacent thereto;
A vent (13a) provided in the second space (13);
An insulating oil storage tank comprising: 2. The insulating oil storage tank according to claim 1, wherein the orifices (2, 3) are provided in a plurality of stages in the flow direction. 3. The insulating oil according to claim 1, wherein the orifice (2) is one or a plurality of openings formed in a width direction from the bottom surface (11) of the first space (12) to a predetermined height. Storage tank. 4. The insulation according to claim 3, wherein the opening of the orifice (2) is any one of a slit (5a), a circle (5b), an oval, an ellipse, a polygon, or a combination thereof (5c). Oil storage tank. 5. The insulating oil storage tank according to claim 1, wherein a current plate (31) is arranged in one or both of the first space (12) and the second space (13).

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