Oil outflow prevention structure

Abstract

To provide an oil outflow prevention structure capable of effectively preventing an outflow of an oil to an outside of an oil protective barrier even in the case of expanding a part of an oil implanting device or its additional facility, from above to an outside of the oil protective barrier.SOLUTION: In an oil outflow prevention structure, an oil catcher 10 is provided which is installed so that the whole of a portion expanded from an oil protective barrier 5 of an oil implanting device 2 or its additional facility 8 is received by a lower part, and returns an oil leaked from the expanded part to an inner side of the oil protective barrier 5. The oil catcher 10 includes: a bottom wall that is arranged above the oil protective barrier 5 and is inclined downward from the outer side to the inner side; and a side wall that is stood at a peripheral edge except an edge part positioned at the inner side of the oil protective barrier 5 of the bottom wall.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to an oil leakage prevention structure for preventing oil leaked from oil-containing equipment for storing oil and its attached equipment from flowing outside a dike.

Background Art

[0002] Oil-containing equipment that stores insulating oil such as transformers, automatic voltage regulators, and shunt reactors. For oil-containing equipment with a large amount of stored oil, an oil dike (a concrete step) is provided to surround the oil-containing equipment and its attached equipment such as radiators so that oil leakage does not flow out to the surroundings (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, as shown in FIG. 7, the conventional oil dike 5 was installed around the foundation 3 so as to surround the entire oil-containing equipment 2 and its attached equipment 8 in plan view. Therefore, if the oil-containing equipment 2 and its attached equipment 8 become larger, the area surrounded by the oil dike must be increased, resulting in increased costs. In addition, depending on the installation location, there may be cases where it is physically impossible to expand the oil dike even if it is desired to expand it, and there may be cases where it is necessary to cope with the existing oil dike.

[0005] In view of such circumstances, the present invention has been made, and a main object thereof is to provide an oil leakage prevention structure capable of effectively preventing oil from flowing outside the oil dike even when the oil-containing equipment and its attached equipment project outward from above the oil dike.

[0006] In addition, cables for alarm and control purposes are connected to the transformer, and these cables are laid in a concrete cable trough installed inside the oil dike and drawn out to the outside of the oil dike. Therefore, if an oil leak occurs in the oil-filled equipment, there is a concern that the leaked oil will enter the cable trough, flow out to the outside of the oil dike, and become unrecoverable. Therefore, it is also an object of the present invention to provide an oil outflow prevention structure that can effectively prevent oil from flowing out to the outside of the oil dike even when oil enters the cable trough installed inside the oil dike.

Means for Solving the Problems

[0007] In order to achieve the above object, an oil outflow prevention structure according to the present invention includes an oil dike that blocks the outflow of oil leaked from an oil-filled equipment or its attached equipment around the foundation of the oil-filled equipment in which oil is stored, and a part of the oil-filled equipment or its attached equipment protrudes from above the oil dike to the outside of the oil dike. In the oil outflow prevention structure used for power equipment installed so as to protrude, An oil receiver is provided so as to receive the entire part of the oil-filled equipment or its attached equipment that protrudes outward from the oil dike below, and is characterized in that the oil leaked from the protruding part is returned to the inside of the oil dike.

[0008] Therefore, even if oil leaks outside the oil dike from a part of the oil-filled equipment or its attached equipment that protrudes outside the area of the oil dike, the leaked oil can be captured by the oil receiver and returned to the inside of the oil dike.

[0009] Here, the oil receiver may be configured to have a bottom wall that is arranged above the oil dike from the outside to the inside and slopes downward toward the inside of the oil dike, and side walls that are erected on the periphery excluding the edge portion located inside the oil dike of the bottom wall. According to such an oil receiver, the oil leaked from a part of the oil-filled equipment and its attached equipment that protrudes outward beyond the area surrounded by the oil dike falls onto the bottom wall. The low wall is inclined toward the inside of the oil dike. Furthermore, side walls are erected on the peripheral edge of the bottom wall except for the edge located inside the oil dike, so that the fallen oil is prevented from splashing or moving outside the oil dike and can be surely guided to the inside of the oil dike.

[0010] Moreover, a locking wall that locks to the oil dike from the inside may be provided on the side edge located inside the oil dike of the oil receiver.

[0011] By providing such a locking wall, the inconvenience that the oil receiver comes off the oil dike and shifts to the outside of the oil dike is eliminated.

[0012] The above is an example of providing an oil receiver as an oil leakage prevention structure. When a cable connected to an electric device is drawn out to the outside of the oil dike, a cable trough is installed between the foundation of the oil-filled equipment and the oil dike, a cable is laid in this cable trough, and the cable is drawn out to the outside of the oil dike through an opening provided at a portion of the oil dike facing the cable trough. Therefore, when the oil leaked from the oil-filled equipment and its attached equipment enters the cable trough, there is an inconvenience that it flows out to the outside of the oil dike along the cable.

[0013] Therefore, even when oil enters the cable trough arranged inside the oil dike, it is preferable to effectively discharge the entered oil from the cable trough into the oil dike so as not to flow out to the outside of the oil dike.

[0014] That is, the cable trough installed inside the oil dike to guide the cable connected to the oil-filled equipment to the outside of the oil dike preferably has a recessed portion for laying the cable on the bottom wall, and this recessed portion has a grating structure.

[0015] By adopting such an oil leakage prevention structure, it becomes easier to capture the oil that moves along the cable in the recessed part of the cable trough. In addition, due to the grating structure provided in the recessed part, the oil can be discharged downward from the cable trough and retained inside the oil dike.

[0016] Also, in order to guide the cable connected to the oil-filled equipment to the outside of the oil dike, the cable trough installed inside the oil dike is composed of an upper trough and a lower trough with an open upper end installed overlapping below the upper trough. A recessed part for laying the cable is provided on the bottom wall of the upper trough, and this recessed part may have a grating structure.

[0017] By adopting such an oil leakage prevention structure, the oil that has entered the cable trough is captured in the recessed part of the upper trough and discharged from the grating structure part to the lower trough, and it will no longer flow out from the upper trough to the outside of the oil dike. In addition, by connecting the lower trough to the oil-water separation tank via a drain pan, the oil discharged into the lower trough can be appropriately treated.

Advantages of the Invention

[0018] As described above, according to the present invention, an oil receiver is provided to receive the entire part that protrudes outward from the oil dike of the oil-filled equipment or its attached equipment below, and the oil leaked from the protruding part is returned to the inside of the oil dike. Therefore, even without increasing the area surrounded by the oil dike or when reducing the area surrounded by the oil dike, it is possible to effectively prevent the oil from flowing out to the outside of the oil dike. Also, by providing a recessed part for laying the cable on the bottom wall of the cable trough installed inside the oil dike for laying the cable connected to the oil-filled equipment, and making this recessed part have a grating structure, it is also possible to effectively prevent the oil from flowing out from the cable trough to the outside of the oil dike.

Brief Description of the Drawings

[0019]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Mode for Carrying Out the Invention

[0020] Hereinafter, embodiments of the present invention will be described with reference to the drawings. In FIG. 1, an example of an oil spill recovery facility 1 equipped with an oil outflow prevention structure according to the present invention is shown.

[0021] This oil spill recovery facility 1 is provided on a site where oil-filled equipment 2 such as transformers and shunt reactors used in substations and the like is installed. A foundation 3 is formed on the ground of this site, and the oil-filled equipment 2 is installed on this foundation 3. And an oil retaining wall 5 is installed around the foundation 3 with a gap therebetween, and crushed stones 6 are laid between the foundation 3 and the oil retaining wall 5.

[0022] The oil-filled equipment 2 is provided with auxiliary equipment 8 such as a radiator and an oil delivery pipe for cooling the stored oil, and a part of this auxiliary equipment 8 projects outward from above the oil dike 5.

[0023] Conventionally, the entire oil-filled equipment 2 and its auxiliary equipment 8 were formed with a large oil dike 5 so as not to protrude outward from the oil dike 5 in plan view (increasing the floor area surrounded by the oil dike 5), so that even if oil leaked from the auxiliary equipment 8, it would fall inside the oil dike 5. Here, however, the floor area surrounded by the oil dike 5 is suppressed to be as small as possible, and an oil outflow prevention structure described below is provided for the part of the auxiliary equipment 8 that projects outward from the oil dike 5. In this example, the oil outflow prevention structure is configured by disposing an oil receiver 10 directly below the auxiliary equipment 8 that projects outward from above the oil dike 5.

[0024] As shown in FIG. 2, the oil receiver 10 is arranged from the outside to the inside of the oil dike 5 and has a bottom wall 11 that slopes downward toward the inside of the oil dike 5, and side walls 12a, 12b, 12c erected on the periphery of the bottom wall 11 excluding the side edge located inside the oil dike 5.

[0025] In this example, the bottom wall 11 is formed in a rectangular shape, and a locking wall 13 that extends downward and is locked to the oil dike 5 from the inside is integrally provided on the side edge located inside the oil dike 5. This locking wall 13 may be formed by bending the tip of the bottom wall 11 downward or may be fixed by welding or the like later.

[0026] Also, side walls 12a, 12b, and 12c extending upward are fixed to the three side edges (the side edges on both sides and the side edge along the oil dike 5 on the outside of the oil dike 5) excluding the edge located inside the oil dike 5 (in this example, the side edge of one side located inside the oil dike). This side wall may be formed by bending a part of the bottom wall upward or may be fixed by post - attachment such as welding. The side walls 12a, 12b, and 12c of these three sides are in contact with adjacent side walls, and the contact parts are welded to each other so that the oil that has fallen onto the bottom wall 11 does not leak from the gap between the side walls.

[0027] Also, in order to maintain the inclination of the bottom wall 11 of the oil receiver 10, legs 14 are fixed to the portion of the bottom wall 11 extending outward from the oil dike 5, in this example, the outermost portion of the bottom wall 11. This leg 14 may be formed to have a preset length or may be telescopic so that the length can be variable.

[0028] Therefore, even when the accessory equipment 8 of the oil - filling device 2 is installed so as to project outward from the oil dike 5, since an oil receiver 10 is provided to cover the entire portion projecting from the oil dike 5 directly below from below, even if oil leaks from the accessory equipment 8, it is possible to catch the oil with the oil receiver. Also, since the bottom wall 11 of the oil receiver 10 is inclined downward toward the inside of the oil dike 5, it is possible to return the oil received by the bottom wall 11 to the inside of the oil dike 5.

[0029] Thus, even when a part of the oil - filling device 2 or the accessory equipment 8 is installed so as to project outward from above the oil dike 5, the oil receiver 10 can prevent the leaked oil from flowing out to the outside of the oil dike 5. Therefore, it becomes possible to make the site surrounded by the oil dike 5 as small as possible (it becomes possible to form the oil dike 5 as close as possible to the foundation 3), and it is not necessary to form the oil dike according to the size of the oil - filling device and its accessory equipment or while worrying about their size.

[0030] The above configuration is designed to prevent oil from flowing out to the outside of the oil retaining dike 5 even if an oil leak occurs outside the oil retaining dike 5 from the oil filling equipment 2. However, oil may flow out from the oil retaining dike 5 to the outside through the cable trench for laying the cable connected to the oil filling equipment 2.

[0031] That is, as shown in Fig. 3, the cable 15 (for example, a cable for alarm or control) connected to the oil filling equipment 2 enters the cable pit 17 formed in the foundation 3 through the protective pipe 16, and is laid from here into the cable trench (hereinafter referred to as the inner cable trench 20) installed between the foundation 3 and the oil retaining dike 5, and is laid into the cable trench (hereinafter referred to as the outer cable trench 40) installed outside the oil retaining dike 5 through the through hole 5a formed in the oil retaining dike 5. The cable pit 17 formed in the foundation 3 has its upper end opening closed by the lid 18, and a through hole 18a for inserting the protective pipe 16 is formed in the lid 18.

[0032] Therefore, there is a concern that the oil leaked from the oil filling equipment 2 may mix with rainwater through the gap between the through hole 18a formed in the lid 18 closing the cable pit 17 and the protective pipe 16 or the gap between the foundation 3 and the lid 18 along the cable 15, enter the cable pit, then enter the inner cable trench 20, and flow out to the outer cable trench 40 through the through hole 5a of the oil retaining dike 5.

[0033] Therefore, the inner cable trench 20 has the structure shown in Fig. 4. Hereinafter, the structure of this inner cable trench 20 will be described. The inner cable trench 20 is made of concrete and formed in a U-shaped cross-section having a bottom wall 21 and a pair of side walls 22 erected from both sides thereof, and the upper end opening can be closed by a concrete lid 23.

[0034] On the bottom wall 21, an inclined surface (concave inclination 24) that gradually inclines downward from both longitudinal ends is formed, and a flat depression 25 is formed in the middle part. Therefore, the bottom wall 21 is relatively thinner at the part of the depression 25 than at both ends. And this depression 25 is formed in a grating structure.

[0035] Therefore, when the cable 15 is laid on the bottom wall 21 of this inner cable trough 20, the cable 15 is placed on the depression 25 of the grating structure. So, the oil mixed with rainwater flowing from the cable pit 17 and the oil mixed with rainwater flowing along the cable are prevented from falling downward from the grating structure part of the depression 25 and moving to the outer cable trough 40 by overcoming the concave inclination 24 close to the oil retaining dike 5.

[0036] According to the above configuration, the leaked oil falling outside the oil retaining dike 5 is returned to the inside of the oil retaining dike 5 by the oil receiver 10, and the oil trying to flow out to the outside of the oil retaining dike 5 through the inner cable trough 20 is also prevented from moving to the downstream side by the depression 25 having the concave inclination 24 and the grating structure.

[0037] Note that the oil falling downward from the depression 25 of the inner cable trough 20 is sent to the oil-water separation tank through a drain pipe (not shown) together with the rainwater and oil staying inside the oil retaining dike 5.

[0038] In FIGS. 5 and 6, other configuration examples of the inner cable trough 20 are shown.

[0039] In this example, the inner cable trough 20 is composed of an upper trough 210 provided with a depression 215 having a grating structure on the bottom wall 211, and a lower trough 220 installed overlapping below the upper trough 210 with its upper end open.

[0040] The upper trough 210 has the same configuration as the inner cable trough 20 shown in FIG. 4. It is made of concrete formed in a U-shaped cross-section having a bottom wall 211 and a pair of side walls 212 erected from both sides thereof, and the upper end opening can be closed by a concrete lid 213. The bottom wall 211 is formed with inclined surfaces (concave inclinations 214) that gradually incline downward from both longitudinal ends, and a flat recessed portion 215 is formed in the middle portion. Therefore, the bottom wall 211 is relatively thinner at the portion of the recessed portion 215 than at both ends. And this recessed portion 215 is formed in a grating structure. Further, the upper trough 210 has a ridge 216 formed on the bottom surface for positioning with the lower trough 220.

[0041] Also, the lower trough 220 is a cable trough having a bottom wall 221 that does not have a recessed portion or a grating structure with respect to the inner cable trough, and a pair of side walls 222 erected from both sides thereof. An opening 223 is formed in the side wall of this lower trough 220, allowing water and oil in the oil dike 5 to flow into the lower trough. This lower trough 220 communicates with a drain pan 51 through a through hole 5b formed in the oil dike 5 and a connecting trough 50, and this drain pan 51 is connected to an oil-water separation tank (not shown) through a drain pipe 52.

[0042] In such an inner cable trough 20, a cable 15 is laid in the upper trough 210, and the cable 15 is led to the outer cable trough 40 through the through hole 5a of the oil dike 5.

[0043] Therefore, the oil mixed with rainwater flowing from the cable pit 17 and the oil mixed with rainwater flowing along the cable 15 are prevented from falling downward from the grating structure portion of the recessed portion 215 and moving over the concave inclination 214 close to the oil dike 5 to the outer cable trough 40. And the oil led to the lower trough 220 is sent to the drain pan 51 together with the water and oil flowing in from the opening 223 formed on the side surface of the lower trough 200 through the through hole 5b of the oil dike 5 and the connecting trough 50, and then sent to the oil-water separation tank through the drain pipe 52 for treatment.

[0044] Therefore, by using such an inner cable trough 20, it is possible to avoid oil from flowing out from the oil dike 5 to the outside through the cable trough, and the oil to be processed (the oil finally sent to the oil-water separation tank) can be recovered by the lower trough 220. Thus, it becomes possible to simultaneously implement countermeasures against oil outflow and countermeasures for treating the stagnant oil in the oil dike, and it becomes possible to simplify the equipment.

Explanation of Signs

[0045] 2 Oil inlet equipment 3 Foundation 5 Oil dike 8 Auxiliary equipment 10 Oil receiver 11 Bottom wall 12a, 18, 12c Side walls 13 Locking wall 20 Inner cable trough 25 Depression 40 Outer cable trough 210 Upper trough 220 Lower trough 215 Depression

Claims

1. An oil leakage prevention structure for an electrical equipment, which is provided with an oil retaining wall for preventing the outflow of oil leaked from the oil-containing equipment or its accessory equipment around the foundation of the oil-containing equipment containing oil, and a part of the oil-containing equipment or its accessory equipment is installed so as to project outward from the oil retaining wall above the oil retaining wall. In this structure, an oil receiver is installed to receive the entire part of the oil-containing equipment or its accessory equipment that projects outward from the oil retaining wall below, and the oil receiver is provided to return the oil leaked from the projecting part to the inside of the oil retaining wall. The oil leakage prevention structure is characterized by this.

2. The oil receiver is arranged above the oil retaining wall from the outside to the inside, and has a bottom wall that inclines downward toward the inside of the oil retaining wall, and a side wall erected on the periphery of the bottom wall excluding the edge located inside the oil retaining wall. The oil leakage prevention structure according to Claim 1 is characterized by this.

3. The oil leakage prevention structure according to Claim 2 is characterized in that a locking wall for locking the oil retaining wall from the inside is provided at the edge of the oil receiver located inside the oil retaining wall.

4. The oil leakage prevention structure according to any one of Claims 1 to 3 is characterized by including a cable trough installed inside the oil retaining wall for guiding the cable connected to the oil-containing equipment to the outside of the oil retaining wall, and the cable trough is provided with a recess for laying the cable on the bottom wall, and this recess has a grating structure.

5. The oil leakage prevention structure according to any one of Claims 1 to 3 is characterized by including a cable trough installed inside the oil retaining wall for guiding the cable connected to the oil-containing equipment to the outside of the oil retaining wall, and the cable trough is composed of an upper trough and a lower trough installed overlapping below the upper trough and having an open upper end. The upper trough is provided with a recess for laying the cable on its bottom wall, and this recess has a grating structure. The oil leakage prevention structure according to any one of Claims 1 to 3 is characterized by this.

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