JP-7857146-B2 - Cable ducts and electrical equipment with cable ducts

Inventors

• 伊藤 千晶
• 山下 みどり

Assignees

• 東芝産業機器システム株式会社

Dates

Publication Date

20260512

Application Date

20220415

Claims (6)

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.

Description

This embodiment relates to a cable duct and electrical equipment with a cable duct. Generally, when connecting cables to the lead bushings of electrical equipment such as oil-filled transformers, a cable duct structure is adopted to eliminate exposed electrical parts, prevent electrical accidents, and protect the lead bushings and cables from damage. Japanese Patent Publication No. 2002-26541 Side view showing a schematic configuration of an example of an electrical device according to one embodiment.Front view showing a schematic configuration of an example of a cable duct according to one embodiment.An exploded cross-sectional view showing an example of an electrical device according to one embodiment, with the cover member removed.Front view showing an example of a cable duct according to one embodiment, with the cover member removed.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.A front view showing an example of a cable duct according to one embodiment, with the lower duct raised to the raised position.A side view showing an example of an electrical device according to one embodiment, with the lower duct raised to the raised position.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. 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. Furthermore, 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-to-down directions is considered the left-to-right direction. The electrical equipment 1 in this embodiment is an oil-immersed 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 box-shaped and houses the electrical equipment body 10 inside. The bushings 12 are attached to the outside of the container 11, protruding from it, and have the function of drawing out lead wires extending from the electrical equipment body 10. Cables 100, raised from a cable pit 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 cylindrical and houses the cables 100 inside. The bushing 12 is attached to the upper part of the container 11. In this case, the bushing 12 is attached so as to protrude upward from the upper 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. The bushing 12 is attached towards the front of the container 11. The cable duct 20 is positioned 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. The cable duct 20 is formed in a box shape with an inverted L-shape when viewed from the side. The cable duct 20 includes a vertical section 201 extending vertically upward from the installation surface, and a horizontal section 202 extending horizontally (in this case, backward) from the upper part 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 end of the horizontal section 202 is connected from above to the upper surface 111 of the container 11. 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 brack