Cable ducts and electrical equipment with cable ducts

Abstract

To provide a cable duct and electric equipment which facilitate laying of cables, to thereby facilitate site installation of the electric equipment.SOLUTION: A cable duct comprises: a duct main body which is formed in an inverted L box shape in side view, and has a front opening and a bottom opening and houses a cable inside; and a front cover which is fitted detachably to the duct main body, and opens / closes the front opening. The front opening and bottom opening communicate with each other. Electric equipment comprises an electric equipment main body, a container which houses the electric equipment main body, a bushing for leading a lead wire from the electric equipment main body, and a cable duct which houses the cable connected to the bushing. The cable duct has a duct main body which is formed in an inverted L box shape in side view, and houses a cable inside, and a front cover which is fitted detachably to the duct main body and opens and closes the front opening, wherein the front opening and bottom opening communicate with each other.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] This embodiment relates to a cable duct and an electric device with a cable duct.

Background Art

[0002] Generally, when connecting a cable to an outlet bushing of an electric device such as an oil-filled transformer, a cable duct structure is adopted for the purpose of eliminating electrical exposed parts to prevent electrical accidents, protecting the outlet bushing and the cable to prevent damage, etc.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Since both the cable and the cable duct are long and heavy, laying the cable in the cable duct is not easy for the operator.

[0005] Therefore, a cable duct in which the cable can be easily laid is provided to facilitate the on-site installation work of the electric device.

Means for Solving the Problems

[0006] The cable duct of the embodiment is a cable duct that houses a cable connected to an electric device therein, and is formed in a box shape with an inverted L shape in side view, and has a front opening and a bottom opening, and includes a duct body that houses the cable therein, and a front cover that is detachably attached to the duct body and opens and closes the front opening. The front opening and the bottom opening communicate with each other.

[0007] The electrical equipment of the embodiment comprises an electrical equipment body, a container for housing the electrical equipment body, a bushing for drawing lead wires from the electrical equipment body, and a cable duct for housing cables connected to the bushing. The cable duct is formed in the shape of an inverted L-shape box when viewed from the side, and has a front opening and a bottom opening, and comprises a duct body for housing cables inside, and a front cover that is detachably attached to the duct body and opens and closes the front opening. The front opening and the bottom opening are in communication with each other. [Brief explanation of the drawing]

[0008] [Figure 1] Side view showing a schematic configuration of an example of an electrical device according to one embodiment. [Figure 2] Front view showing a schematic configuration of an example of a cable duct according to one embodiment. [Figure 3] An exploded cross-sectional view showing an example of an electrical device according to one embodiment, with the cover member removed. [Figure 4] Front view showing an example of a cable duct according to one embodiment, with the cover member removed. [Figure 5] A longitudinal cross-sectional side view showing the state of an example of an electrical device according to one embodiment, in the process of removing the cover member and arranging the cables. [Figure 6] A front view showing an example of a cable duct according to one embodiment, with the lower duct raised to the raised position. [Figure 7] A side view showing an example of an electrical device according to one embodiment, with the lower duct raised to the raised position. [Figure 8] A side view showing an example of an electrical device according to one embodiment, with the lower upper front cover removed and the lower duct pulled out. [Modes for carrying out the invention]

[0009] The following describes one embodiment with reference to the drawings. In Figure 1, the side of the electrical equipment 1 facing the installation surface, i.e., the vertically downward side, is considered the lower side of the electrical equipment 1, and the side opposite the installation surface, i.e., the vertically upward side, is considered the upper side of the electrical equipment 1. Also, the side facing the cable duct 20 in Figure 1 is considered the front side of the electrical equipment 1, and the side facing the container 11 is considered the rear side of the electrical equipment 1. The horizontal direction perpendicular to the front-to-back and up-and-down directions is considered the left-to-right direction.

[0010] The electrical equipment 1 in this embodiment is an oil-filled transformer. In this embodiment, the electrical equipment 1 is a three-phase transformer, but is not limited to this. The electrical equipment 1 comprises an electrical equipment body 10, a container 11, one or more bushings 12 (in this case, three), one or more support members 13 (in this case, three), and a cable duct 20. The electrical equipment body 10 is the transformer body. The container 11 is formed in a box shape and houses the electrical equipment body 10 inside. The bushings 12 are attached to the outside of the container 11 and have the function of drawing out lead wires extending from the electrical equipment body 10. Cables 100 that are raised from a cable pit provided in the ground are connected to each bushing 12. The support members 13 are attached to the container 11 and have the function of supporting the load of the cable duct 20 and the cables 100 housed in the cable duct 20. The cable duct 20 is formed in a cylindrical shape and houses the cables 100 inside.

[0011] The bushing 12 is attached to the top of the container 11. In this case, the bushing 12 is attached so as to protrude upward from the top surface 111 of the container 11. In other embodiments, the bushing 12 may be attached so as to protrude forward from the front surface 112 of the container 11.

[0012] The bushing 12 is attached towards the front of the container 11. The cable duct 20 is located in front of the container 11. The bushing 12 is a secondary bushing, and the cable duct 20 is a secondary cable duct. The electrical equipment 1 has a primary bushing (not shown) on the opposite side of the container 11 from the bushing 12, in this case towards the rear. The electrical equipment 1 also has a primary cable duct (not shown) on the opposite side of the cable duct 20, in this case towards the rear of the container 11.

[0013] The cable duct 20 is formed in the shape of an inverted L-shaped box when viewed from the side. The cable duct 20 is composed of a vertical section 201 that extends vertically upward from the installation surface and a horizontal section 202 that extends horizontally, in this case towards the rear, from the top of the vertical section 201. When the electrical equipment 1 is installed at the installation site, the vertical section 201 is positioned above the cable pit. The rear of the horizontal section 202 is connected from above to the top surface 111 of the container 11.

[0014] The cable 100 is extended upward through the vertical section 201 from a cable pit formed on the installation surface, and further extended backward through the horizontal section 202 to the bushing 12. An adapter 14 is provided inside the horizontal section 202 to support the cable 100. Inside the vertical section 201, a cleat 15, one or more brackets 16 (in this case, three), and one or more bracket supports 17 (in this case, three) are provided to support the cable 100.

[0015] The support members 13 are attached to the front portion 112 of the container 11, extend forward, and are connected to the vertical portion 201 of the cable duct 20. The height position of each support member 13 is approximately the same as the height position of each bracket 16 and bracket support 17.

[0016] The cable duct 20 has a duct main body 21 and, as cover members, one or more, in this case three, front covers 22, 23, 24 and an upper cover 25. The duct main body 21 is formed in a box shape with an inverted L shape in side view and constitutes the main body of the cable duct 20. The front covers 22, 23, 24 and the upper cover 25 are detachably attached to the duct main body 21.

[0017] The duct main body 21 is formed in a U-shaped cross section and is open toward the front, downward, and upward. Also, at least a part of the upper portion of the duct main body 21 is open toward the back. The duct main body 21 has a left wall portion 211, a right wall portion 212, a back wall portion 213, a front opening 214, an upper opening 215, an upper back opening 216, a bottom opening 217, a connection surface 218, and a connection surface opening 219. The left wall portion 211, the right wall portion 212, the back wall portion 213, and the connection surface 218 form the wall portions of the duct main body 21. The front opening 214, the upper opening 215, the upper back opening 216, the bottom opening 217, and the connection surface opening 219 communicate the inside and the outside of the duct main body 21.

[0018] The left and right wall portions 211, 212 are plate-shaped with an inverted L shape in side view and form a plane perpendicular to the left-right direction. The back wall portion 213 forms the back surface of the vertical portion 201. The back wall portion 213 is plate-shaped with a rectangular shape in front view and forms a plane perpendicular to the front-back direction. The height position of the upper edge portion of the back wall portion 213 is set lower than the height positions of the upper edge portions of the left and right wall portions 211, 212.

[0019] The front opening 214 is an opening formed in the front surface of the box shape of the duct main body 21 and opens the duct main body 21 toward the front. The front opening 214 is formed over the entire height dimension in the vertical direction of the duct main body 21, that is, from the installation surface to the upper edge portion of the duct main body 21. Also, in the present embodiment, the front opening 214 is formed over substantially the entire width dimension in the left-right direction of the duct main body 21.

[0020] The upper opening 215 is an opening formed in the box-shaped upper surface of the duct main body 21, and opens the duct main body 21 upward. The upper opening 215 is formed across the entire depth dimension in the front-rear direction of the duct main body 21, that is, across the front edge portion to the back edge portion of the duct main body 21.

[0021] The upper back opening 216 is an opening formed in the back surface of the horizontal portion 202, and opens the duct main body 21 backward. The upper back opening 216 is formed across the entire height dimension in the vertical direction of the horizontal portion 202, that is, across the upper edge portion to the lower edge portion of the horizontal portion 202.

[0022] The bottom opening 217 is an opening formed in the lower part of the vertical portion 201, and opens the duct main body 21 downward. The bottom opening 217 is formed across substantially the entire width dimension in the left-right direction and the depth dimension in the front-rear direction of the vertical portion 201.

[0023] The front covers 22, 23, 24 are detachably attached to the duct main body 21 and open and close the front opening 214. In this case, the front covers 22, 23, 24 are arranged side by side in this order from top to bottom. The upper cover 25 is detachably attached to the duct main body 21 and opens and closes the upper opening 215 and the upper back opening 216.

[0024] The front opening 214, the upper opening 215, the upper back opening 216, and the bottom opening 217 are all in communication with each other. In other words, the lower edge of the front opening 214 is connected to the front edge of the bottom opening 217. The upper edge of the front opening 214 is connected to the front edge of the upper opening 215. The rear edge of the upper opening 215 is connected to the upper edge of the upper back opening 216. Therefore, as shown in Figure 3, with the front covers 22, 23, and 24 and the top cover 25 removed, the duct body 21 has a continuous opening that extends from the installation surface to the top surface 111 of the container 11. That is, workers can freely access the vertical section 201 of the duct body 21 from the bottom to the top, and the horizontal section 202 from the front to the back, from any position outside the duct body 21 without being obstructed by obstacles. As a result, when connecting the cable 100 extending from the cable pit to the bushing 12, the worker can easily install the cable 100 inside the duct body 21 by simply raising the cable 100 from the cable pit and passing it through the front opening 214 and the upper opening 215, as shown in Figure 5.

[0025] Furthermore, the formation of an upper rear opening 216 close to the bushing 12 makes it easier to connect the cable 100 to the bushing 12. Moreover, since the upper rear opening 216 is in communication with the upper opening 215, the space available for workers and equipment used for installation work to access the bushing 12 is increased, making on-site installation of the electrical equipment 1 even easier.

[0026] The cable duct 20 can be disassembled into multiple, in this case, two ducts. The cable duct 20 consists of an upper duct 20a and a lower duct 20b. The upper duct 20a is located at the top of the cable duct 20 and consists of the upper part of a vertical section 201 and a horizontal section 202. The lower duct 20b is located at the bottom of the cable duct 20 and consists of the lower part of the vertical section 201. The upper duct 20a and the lower duct 20b are constructed separately, and the lower duct 20b can be removed from the upper duct 20a.

[0027] Furthermore, the depth dimension in the front-to-back direction and the width dimension in the left-to-right direction of the lower duct 20b are set to be smaller than the depth dimension and width dimension of the vertical portion 201 of the upper duct 20a. In other words, the cross-sectional area of ​​the lower duct 20b is set to be smaller than the cross-sectional area of ​​the vertical portion 201 of the upper duct 20a. When the cable duct 20 is in use, at least a portion of the upper part of the lower duct 20b is located inside the upper duct 20a. That is, at the lower edge of the upper duct 20a, the upper duct 20a and the lower duct 20b overlap each other in the horizontal direction.

[0028] Furthermore, the lower duct 20b is movable vertically as shown by the arrows in Figures 6 and 7, with a portion of it positioned inside the upper duct 20a. As shown in Figures 6 and 7, the upper part of the lower duct 20b can be raised further inside the upper duct 20a and fixed to the upper duct 20a with fasteners such as bolts (not shown). This allows the cable duct 20 to be made smaller by reducing its vertical length during transport. This makes handling the cable duct 20 easier during transport. Also, when installing the cable duct 20, the worker can visually confirm the cable pit while fixing the lower duct 20b in the raised position, and then release the fixing between the lower duct 20b and the upper duct 20a. Then, as shown by the arrows in Figures 6 and 7, the lower duct 20b is moved downward and placed in the installation position on the installation surface. This makes positioning the cable duct 20 easier. Furthermore, since the lower duct 20b is movable vertically, even if the height of the mounting surface directly below the container 11 does not match the height of the mounting surface directly below the cable duct 20 due to unevenness or slope, the cable duct 20 can be easily fitted tightly to the mounting surface.

[0029] In the installed and used state of the cable duct 20, the overlap dimension, which indicates the vertical length of the upper duct 20a and the lower duct 20b that overlaps horizontally, can be within the range of 30 mm to 130 mm, depending on the condition of the installation surface. In this embodiment, the overlap dimension of the upper duct 20a and the lower duct 20b is approximately 30 mm.

[0030] The upper duct 20a comprises an upper duct body 21a, upper front covers 22 and 23, and a top cover 25. The upper front covers 22 and 23 are detachably attached to the upper duct body 21a and open and close the upper front opening 214a formed on the front of the upper duct body 21a.

[0031] The lower duct 20b comprises a lower duct body 21b and a lower front cover 24. The lower front cover 24 is detachably attached to the lower duct body 21b and opens and closes the lower front opening 214b formed on the front surface of the lower duct body 21b.

[0032] The upper front covers 22 and 23 are positioned on roughly the same plane, resulting in a so-called flush surface. The lower front cover 24 is positioned closer to the center of the duct body 21, that is, in this case, towards the rear, than the upper front covers 22 and 23. In this embodiment, the upper front covers 22 and 23 are divided into two parts for ease of handling, but this is not limited to this. In other embodiments, the upper front cover may be constructed as a single unit without division, or it may be divided into three or more parts.

[0033] The upper front covers 22, 23, the lower front cover 24, and the top cover 25 each have one or more handles 26, in this case two. The handles 26 are mounted so as to protrude outward from the surfaces formed by each cover 22, 23, 24, 25 relative to the cable duct 20. When removing or attaching each cover 22, 23, 24, 25 to the duct body 21a, 21b, the worker can grasp the handles 26 to operate each cover 22, 23, 24, 25.

[0034] The upper duct body 21a has an upper flange portion 27. The lower duct body 21b has a lower flange portion 28. The flange portions 27 and 28 are provided on the left and right edges of the front opening 214a of the upper duct body 21a and the front opening 214b of the lower duct body 21b, respectively. Furthermore, the flange portions 27 and 28 have a plurality of holes 29 arranged in a vertical direction. The upper front covers 22 and 23 and the lower front cover 24 each have a plurality of holes 30 at positions corresponding to the holes 29 when attached to the duct body 21. The duct body 21 and the front covers 22, 23, and 24 can be fixed to the flange portions 27 and 28 by fastening members such as bolts that pass through the holes 29 and 30.

[0035] The upper duct body 21a has flanges (not shown) on the left and right edges of the upper opening 215 and the upper back opening 216. The flanges and the top cover 25 have holes at corresponding positions when the top cover 25 is attached to the duct body 21, and the top cover 25 can be fixed to the flanges by fastening members such as bolts.

[0036] The upper flange portion 27 is formed on the left and right edges of the upper front opening 214a and extends in a long, narrow shape in the vertical direction. The lower flange portion 28 is formed on the left and right edges of the lower front opening 214b and extends in a long, narrow shape in the vertical direction. The flange portions 27 and 28 form a surface perpendicular to the front-to-back direction. The distance between opposite sides of the left and right upper flange portions 27 is set to be smaller than the width dimension of the lower duct 20b in the left-to-right direction.

[0037] The height of the lower end 271 of the upper flange portion 27 is set higher than the height of the lower edge 21a1 of the upper duct body 21a. In other words, the upper flange portion 27 is not formed on the lower edge 21a1 of the upper duct body 21a. Conversely, it can be said that the upper flange portion 27 is notched at the bottom. Furthermore, in the operating state in which the cable duct 20 is installed, the height of the lower end 271 of the upper flange portion 27 is set higher than the position of the upper edge 21b1 of the lower duct body 21b. Therefore, although the lower duct 20b and the upper duct 20a overlap horizontally, with the upper front cover 23 removed, the lower duct 20b can be pulled forward as shown in Figure 8. In this case, the distance from the lower edge 21a1 of the upper duct body 21a to the lower end 271 of the upper flange portion 27 only needs to be set to be greater than the overlap dimension of the lower duct 20b and the upper duct 20a, and can be set within the range of 40 mm to 140 mm, for example. In this embodiment, the distance from the lower edge 21a1 of the upper duct body 21a to the lower end 271 of the upper flange portion 27 is set to approximately 50 mm.

[0038] The upper front covers 22 and 23 each have stepped portions 221 and 231 and hanging portions 222 and 232 at their lower edges. The stepped portions 221 and 231 extend forward from the lower edges of the surfaces formed by the upper front covers 22 and 23. The hanging portions 222 and 232 extend downward from the tips of the stepped portions 221 and 231, respectively.

[0039] The height of the lower edge of the hanging portion 222 is set lower than the height of the upper edge of the lower upper front cover 23. The height of the lower edge of the hanging portion 232 is set lower than the height of the upper edge of the lower front cover 24. The height of the lower edge of the hanging portion 251 is set lower than the height of the upper edge of the upper front cover 22.

[0040] In other words, the height of the upper edge of the lower upper front cover 23 is set lower than the height of the stepped portion 221 of the upper upper front cover 22, and higher than the height of the lower edge of the hanging portion 222. The height of the upper edge of the lower front cover 24 is set lower than the height of the stepped portion 231 of the lower upper front cover 23, and higher than the height of the lower edge of the hanging portion 232.

[0041] As a result, with each cover 22, 23, and 24 attached to the upper duct body 21a and the lower duct body 21b, the upper edge of the lower upper front cover 23 is covered from above and from the front by the stepped portion 221 and the hanging portion 222 of the upper upper front cover 22. Similarly, the upper edge of the lower front cover 24 is covered from above and from the front by the stepped portion 231 and the hanging portion 232 of the lower upper front cover 23. The top cover 25 also has a hanging portion 251 at its front edge. With the top cover 25 and the upper front cover 22 attached to the upper duct body 21a, the upper edge of the upper front cover 22 is covered from the front by the hanging portion 251 of the top cover 25. Therefore, rainwater, insects, and other debris are prevented from entering the interior through the gaps between the front covers 22, 23, and 24 and the upper duct body 21a and the lower duct body 21b.

[0042] In conventional cable ducts, a cylindrical lower duct is lifted upwards, and cables emerging from the ground are routed through an opening at the bottom of the lower duct and installed inside. However, this method of routing cables several meters long through the lower duct little by little is cumbersome. Additionally, ducts with hinged doors on the front that allow workers to access the interior are known, but because the duct has a rectangular frame that houses the door, it is not possible to freely access the interior of the duct from any position outside the duct body. Therefore, it is necessary to route long cables through the duct body little by little, which is also a cumbersome process.

[0043] In contrast, according to the embodiment described above, the cable duct 20 houses the cable 100 connected to the electrical equipment 1. The cable duct 20 comprises a duct body 21 and front covers 22, 23, and 24. The duct body 21 is formed in the shape of an inverted L-shaped box when viewed from the side, and has a front opening 214 and a bottom opening 217, and houses the cable 100 inside. The front covers 22, 23, and 24 are detachably attached to the duct body 21 and open and close the front opening 214. The front opening 214 and the bottom opening 217 are in communication with each other.

[0044] In other words, the lower edge of the front opening 214 is connected to the front edge of the bottom opening 217. This allows workers to easily house the cable 100 inside the duct body 21 simply by raising the cable 100 from the installation surface, without having to struggle to run it through the bottom opening or frame. As a result, the installation of the cable 100 becomes easier, and the on-site installation of the transformer as electrical equipment becomes easier.

[0045] The duct body 21 has a front opening 214 and an upper opening 215 that communicates with each other. The cable duct 20 is equipped with a top cover 25 that is attached to the duct body 21 and opens and closes the upper opening 215.

[0046] This allows the mounting surface of the bushing 12 to be exposed to the outside. In other words, with the covers 22, 23, 24, and 25 removed, the worker can insert the cable 100 into the duct body 21 from the mounting surface to the connection surface 218 where the bushing 12 is located, without being obstructed by the frame or other parts. As a result, the laying of the cable 100 becomes even easier, and the on-site installation work of the transformer as an electrical device becomes even easier.

[0047] Here, the combined vertical height of the lower duct 20b and upper duct 20a amounts to several meters. Therefore, it is difficult to transport the cable duct 20 in its assembled state from the factory to the installation site. For this reason, the lower duct 20b and upper duct 20a are sometimes transported separately. In that case, if the upper duct has a frame for receiving a door, the lower duct cannot be removed or re-stored inside without disassembling the upper duct.

[0048] In contrast, according to this embodiment, the duct body 21 is composed of an upper duct body 21a and a lower duct body 21b positioned below the upper duct body 21a. The front covers 22, 23, and 24 are composed of upper front covers 22 and 23 that open and close the front opening 214a formed in the upper duct body 21a, and a lower front cover 24 that opens and closes the front opening 214b formed in the lower duct body 21b. In use, at least a portion of the upper part of the lower duct body 21b is inserted into the upper duct body 21a. The lower duct body 21b is configured to be pullable forward from the upper duct body 21a when the upper front cover 23 is removed.

[0049] This allows the lower duct body 21b to be removed from the upper duct body 21a without disassembling the upper duct body 21a. Therefore, the installation of the cable duct 20 becomes even easier.

[0050] The upper duct body 21a has flange portions 27 that extend vertically and are formed on the left and right edges of the front opening 214a. The flange portions 27 are configured to fasten the upper front covers 22 and 23. The height position of the lower end portion 271 of the flange portion 27 is set higher than the height position of the upper end portion of the lower duct body 21b when the cable duct 20 is in use.

[0051] In other words, a notch is provided at the bottom of the upper flange portion 27 of the upper duct body 21a. Therefore, the worker can remove the lower duct 20b, whose upper part is inserted into the upper duct body 21a, without disassembling the upper duct body 21a. This makes it possible to attach and detach the lower duct 20b to the upper duct body 21a with a simple structure. Consequently, the installation work of the cable duct 20 becomes even easier.

[0052] Furthermore, the flange portions 27 and 28 have holes 29 through which fastening members can pass to fasten the upper front covers 22 and 23 and the lower front cover 24. The upper front covers 22 and 23 and the lower front cover 24 have holes 30 through which fastening members can pass to fasten to the flange portions 27 and 28.

[0053] In this case, the electrical equipment 1, including the cable duct 20, is often installed outdoors. Therefore, there is a risk that rainwater may enter between the upper front covers 22 and 23 and the upper duct body 21a, and between the lower front cover 24 and the lower duct body 21b.

[0054] In contrast, the upper front covers 22 and 23 have stepped portions 221 and 231 extending forward from their lower edges, and hanging portions 222 and 232 extending downward from the tips of the stepped portions. When the upper front cover 23 is attached to the upper duct body 21a and the lower front cover 24 is attached to the lower duct body 21b, the stepped portion 231 covers the upper edge of the lower front cover 24 from above. The hanging portion 232 covers the upper edge of the lower front cover 24 from the front.

[0055] This prevents rainwater and foreign objects from entering the duct through the gap between the lower front cover 24 and the lower duct body 21b. Therefore, an opening can be formed across the entire front surface of the duct body 21, making installation easier while suppressing deterioration of the cable 100 due to rainwater and other elements.

[0056] The electrical equipment 1 of this embodiment comprises an electrical equipment body 10, a container 11, a bushing 12, and a cable duct 20. The container 11 houses the electrical equipment body 10. The bushing 12 draws lead wires out from the electrical equipment body 10. The cable duct 20 houses the cable 100 connected to the bushing 12. The cable duct 20 has a duct body 21 and front covers 22, 23, and 24. The duct body 21 is formed in the shape of an inverted L-shaped box when viewed from the side, and has a front opening 214 and a bottom opening 217, and has the function of housing the cable 100 inside. The front covers 22, 23, and 24 are detachably attached to the duct body 21 and open and close the front opening 214. The front opening 214 and the bottom opening 217 are in communication with each other.

[0057] In this embodiment, the cable duct 20 is a secondary cable duct that houses the secondary cable 100, but it is not limited to this. In other embodiments, the cable duct 20 may be a primary cable duct that houses the primary cable, or the structure of both the primary and secondary cable ducts may be configured as cable duct 20.

[0058] Although one embodiment of the present invention has been described above, this embodiment is presented as an example and is not intended to limit the scope of the invention. This novel embodiment can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their variations are included in the scope and spirit of the invention, as well as in the claims of the invention and its equivalents. [Explanation of Symbols]

[0059] 1…Electrical equipment, 10…Electrical equipment body, 11…Container, 12…Bushing, 20…Cable duct, 20a…Upper duct, 20b…Lower duct, 21…Duct body, 21a…Upper duct body, 21b…Lower duct body, 214…Front opening, 215…Upper opening, 216…Upper rear opening, 217…Bottom opening, 22…Upper front cover (front cover), 23…Upper front cover (front cover), 221, 231…Stepped section, 222, 232…Drooping section, 24…Lower front cover (front cover), 25…Top cover, 27…Upper flange section (flange section), 28…Lower flange section (flange section)

Claims

1. A cable duct that houses cables connected to electrical equipment, A duct body formed in the shape of an inverted L-shape box when viewed from the side, having a front opening and a bottom opening, and housing cables inside, The duct body is detachably attached to a front cover that opens and closes the front opening, The front opening and the bottom opening are in communication with each other. The duct body has an upper opening that communicates with the front opening, The duct body is equipped with an upper cover that opens and closes the upper opening, Cable duct.

2. A cable duct that houses cables connected to electrical equipment, A duct body formed in the shape of an inverted L-shape box when viewed from the side, having a front opening and a bottom opening, and housing cables inside, The duct body is detachably attached to a front cover that opens and closes the front opening, The front opening and the bottom opening are in communication with each other. The duct body comprises an upper duct body and a lower duct body positioned below the upper duct body. The front cover comprises an upper front cover that opens and closes the front opening formed in the upper duct body, and a lower front cover that opens and closes the front opening formed in the lower duct body. In the operating state, at least a portion of the upper part of the lower duct body is inserted into the upper duct body. The lower duct body is configured to be pullable forward from the upper duct body when the upper front cover is removed. Cable duct.

3. The upper duct body is formed extending vertically from the left and right edges of the front opening and has flange portions capable of fastening the upper front cover. The height position of the lower end of the flange portion is set higher than the height position of the upper end of the lower duct body when the cable duct is in use. The cable duct according to claim 2.

4. The upper front cover has a stepped portion that protrudes forward at its lower end, and a hanging portion that extends downward from the tip of the stepped portion. With the upper front cover attached to the upper duct body and the lower front cover attached to the lower duct body, The stepped portion covers the upper end of the lower front cover from above. The aforementioned hanging portion covers the upper end of the lower front cover from the front. The cable duct according to claim 2 or 3.

5. The electrical equipment itself, A container for housing the main body of the electrical equipment, A bushing from which lead wires are drawn out of the main body of the electrical equipment, The system includes a cable duct that houses the cable connected to the bushing, The aforementioned cable duct is A duct body formed in the shape of an inverted L-shape box when viewed from the side, having a front opening and a bottom opening, and housing cables inside, It has a front cover that is detachably attached to the duct body and opens and closes the front opening, The front opening and the bottom opening are in communication with each other. The duct body has an upper opening that communicates with the front opening, The cable duct is equipped with a top cover attached to the duct body that opens and closes the upper opening. Electrical equipment.

6. The electrical equipment itself, A container for housing the main body of the electrical equipment, A bushing from which lead wires are drawn out of the main body of the electrical equipment, The system includes a cable duct that houses the cable connected to the bushing, The aforementioned cable duct is A duct body formed in the shape of an inverted L-shape box when viewed from the side, having a front opening and a bottom opening, and housing cables inside, It has a front cover that is detachably attached to the duct body and opens and closes the front opening, The front opening and the bottom opening are in communication with each other. The duct body comprises an upper duct body and a lower duct body positioned below the upper duct body. The front cover comprises an upper front cover that opens and closes the front opening formed in the upper duct body, and a lower front cover that opens and closes the front opening formed in the lower duct body. In the operating state, at least a portion of the upper part of the lower duct body is inserted into the upper duct body. The lower duct body is configured to be pullable forward from the upper duct body when the upper front cover is removed. Electrical equipment.

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