JP2021141217A - Ground-mounted transformer - Google Patents

Abstract

To improve the workability of wiring work of a ground-mounted transformer cable set on a sidewalk along a road.SOLUTION: In a foundation base that constitutes an outer box of a ground-mounted transformer, a portion that obstructs wiring of a cable through a ground is made removable, and the removable portion is removed, and wiring work is performed while the ground-mounted transformer is installed.SELECTED DRAWING: Figure 2

Description

The present invention relates to the structure of an outer box of a ground-mounted transformer with improved workability of cable wiring work.

Distribution transformers were generally installed on utility poles, but in recent years, undergrounding of distribution lines has been promoted from the viewpoint of improving the landscape in urban areas and strengthening disaster prevention. A ground-mounted transformer is used as a distribution transformer for undergrounding, but in consideration of safety so that pedestrians do not come into contact with the charging part because it is installed on the sidewalk along the road, Fig. 1 shows. As shown, the entire distribution transformer is covered with a metal cube storage box. In addition, the side plate of the storage box has a door structure for checking the transformer and connecting the high-voltage and low-voltage cable wiring to the transformer. (See, for example, Patent Document 1)

Japanese Patent Application Laid-Open No. 10-0846

The door of the storage box is L-shaped by cutting out a part of the side plate portion on both sides or one side of the storage box, arranging the rotating portion of the Kannon door in the vicinity thereof, and arranging the L-shaped Kannon door. The opening was widened by opening the mold door.

However, since the ground-mounted transformer A is installed on the sidewalk along the road, it is necessary to make the size of the outer box (storage box in Patent Document 1) as small as possible including the height, and it is normally installed on the ground. In the type transformer A, as shown in FIG. 1, most of the inside of the outer box composed of the top plate portion 1, the side plate portion 2, and the foundation base 3 is the internal equipment such as the transformer 4, the high voltage equipment 5, and the low voltage branching device 6. It occupies, and the gap between the outer box and the internal equipment is minimized.

The ground-mounted transformer A is a ground-mounted transformer A in which the foundation base 3 is fastened to an anchor bolt or the like provided for the installation base 8 installed on the concrete base 7 constructed on the road surface of the sidewalk. Is fixed on the road, and the inside of the installation base 8 has a structure connected to an underground electric wire utility tunnel.

Further, the transformer 4, the high-voltage device 5, the low-voltage branching device 6, etc. are installed near the center of the outer box, and are located between the mounting base 9 and the foundation base 3 for fixing the transformer 4 and the high-voltage device 5 and the like to the foundation base 3. The high-voltage side cable 11 and the low-voltage side cable 12 are introduced in a state of being raised substantially vertically from the electric wire common groove through the narrow bottom opening 10. Then, the high-voltage side cable 11 and the low-voltage side cable 12 are bent inside the foundation base 3 outer box so as not to hit the high-voltage device 5, the low-voltage branching device 6, and the foundation base 3, and are pulled out of the outer box.

Therefore, even if the side plate portion 2 is wide open and the opening on the side surface of the outer box is widened, the cable bending space (shaded portion) between the high-pressure device 5 and the foundation base 3 shown in FIG. 1 (b) is narrow. , When the cable is pulled out of the outer box for connection work due to twisting of the high-voltage side cable 11 or terminal processing for attaching the cable connector 13 to each cable terminal part, the basic base 3 interferes with the work due to rubbing of the cable or the like. There was a problem of becoming.

The present invention improves the wiring work of the high-voltage side cable introduced from the bottom opening of the outer box even when the space between the internal device such as the transformer and the outer box is minimized in the ground-mounted transformer. It provides a ground-mounted transformer that can be installed.

The invention according to claim 1 includes a square outer box composed of a top plate portion, a side plate portion, and a foundation base, a transformer, a high-voltage device, and a low-voltage branching device in the outer box, and removes a cable that has passed through the ground. In a ground-mounted transformer that is installed through the opening at the bottom of the box and is configured to connect the introduced high-voltage side cable to the high-voltage equipment and the low-voltage side cable to the low-voltage branching device, during the installation work of the ground-mounted transformer. A ground-mounted transformer characterized by having a detachable structure for the foundation base that hinders cable wiring work.

According to the invention of claim 1, since the foundation base portion of the outer box that hinders the wiring work has a structure that can be attached and detached, it can be attached and detached when the wiring work is performed in the installation work of the ground-mounted transformer. By removing the foundation base part for work, the workability of wiring work can be improved.

(A) is a horizontal sectional view showing the structure of a general ground-mounted transformer, and (b) is a vertical sectional view. (C) A vertical cross-sectional view showing the structure of the ground-mounted transformer of the present invention, (d) is a cross-sectional view on the aa'plane, and (e) is a cross-sectional view on the bb'planet. (F) is a vertical cross-sectional view showing an operating state of the ground-mounted transformer of the present invention, (g) is a cross-sectional view on the aa'plane, and (h) is a cross-sectional view on the bb'planet. Cross-sectional view when pulling out a cable using the ground-mounted transformer of the present invention.

Example 1 of the present invention will be described with reference to FIGS. 2 and 3. FIG. 2C is a vertical cross-sectional view showing the structure of the ground-mounted transformer of the present invention, FIG. 2D is a cross-sectional view taken along the aa'plane, and FIG. 2E is a cross-sectional view taken along the bb'planet. It is a cross-sectional view. A is a ground-mounted transformer. 1 is the top plate portion of the outer box, 2 is the side plate portion of the outer box, and 3 is the basic base of the outer box.

A transformer 4, a high-voltage device 5, and a low-voltage branching device 6 are housed and installed in the outer box. The high-voltage device 5 is generally composed of a high-voltage cutout 5a and a switch 5b. The high-voltage cutout 5a is connected to the high-voltage side of the transformer 4, and the high-voltage side cable 11 derived from the underground wiring path is connected to the switch 5b.

Further, the low-voltage branching device 6 is electrically connected to the charging unit on the secondary side of the transformer 4, and of the ground-mounted transformer device A via the low-voltage side cable 12 connected to the low-voltage branching device 6. It is connected to the consumer side from the electric wire utility tunnel provided directly below via the underground wiring path.

A detachable portion having a structure in which the upper portion of the foundation base 3 which is an obstacle when the high-voltage side cable 11 is pulled out from the bottom opening 10 is detachable in front of the cable connector insertion port of the switch 5b shown in FIG. 1 (b). It is set to 3a (shaded area). Since the detachable portion 3a is fastened to the other foundation base 3 by bolts, screws, etc. at a place where it does not interfere with the side plate portion 2, it has a structure that can be easily removed as needed during wiring work or inspection. There is.

As described above, since the ground-mounted transformer A has a structure in which the attachment / detachment portion 3a can be attached / detached from the foundation base 3, when the ground-mounted transformer A is installed and wiring work is performed, FIG. (F), As shown in FIG. 3 (g), by removing the attachment / detachment portion 3a from the foundation base 3, the lower side of the opening is lowered to a portion close to the installation base 8, so that the high-voltage side cable 11 can be bent. It is possible to reduce the part that becomes an obstacle when pulling out, and it is possible to improve the workability of the worker.

Although the high-voltage cable side has been described this time, when the number of low-voltage side cables 12 is increased or the cable bending space on the low-voltage side is reduced by downsizing the outer box, the same applies to the low-voltage side cable side. By adopting a structure in which the upper portion of the foundation base 3 can be attached and detached, the wiring work of the low-voltage side cable can be improved.

It can be used for ground-mounted transformers.

1 Top plate 2 Side plate 3 Basic base 3a Detachable part 4 Transformer 5 High-voltage equipment 5a High-voltage cutout 5b Switch 6 Low-voltage branching device 7 Concrete base 8 Installation base 9 Mounting base 10 Bottom opening 11 High-voltage side cable 12 Low-voltage side Cable 13 Cable connector A Ground-mounted transformer

Claims (1)

A square outer box consisting of a top plate, side plates, and a foundation base, equipped with a transformer, high-voltage equipment, low-voltage branching device, etc. inside the outer box, and a cable that passes through the ground is introduced from the bottom opening of the outer box. In the ground-mounted transformer configured to connect the introduced high-voltage side cable to the high-voltage equipment and the low-voltage side cable to the low-voltage branching device, the cable wiring work is hindered during the installation work of the ground-mounted transformer. A ground-mounted transformer with a removable base base.

Images