JPH0246174Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to an improvement of a pole-mounted power transformer for the purpose of beautifying distribution lines and simplifying pole mounting materials and pole mounting work.

[Prior art]

In the conventional power distribution system, power distribution equipment such as transformers and cut-out switches are installed on pole arms attached to utility poles using mounting brackets, and high and low voltage distribution lines are installed on the pole arms. Since the electric wires are held in place by supporting insulators, the wiring such as the power distribution lines and the connecting wires on the high and low voltage sides of the transformers are exposed and intersected above the roads, which is unfavorable from the aesthetic point of view of the city.

In addition, mounting a transformer on a pole is uneconomical because it requires pole mounting arms and mounting hardware, and the wiring is complicated, making it difficult to carry out electrical work and maintain and inspect lines. It was extremely dangerous and had the disadvantage that wiring work required a lot of effort.

[Purpose of invention]

The object of the present invention is to provide a pole-mounted transformer for power distribution, which eliminates the above-mentioned drawbacks and allows the installation of the transformer on the pole and the wiring to the transformer simply without impairing the aesthetic appearance of the city. be.

[Summary of the idea]

In the present invention, a pair of side plates are inserted into a cylinder formed in a cylindrical shape at a distance from each other in directions facing each other and welded to the cylinder. These surfaces form a content storage section with a substantially elliptical cross section, and at the same time as forming this content storage section, a cavity formed between the side plate forming the content storage section and the circumferential surface of the cylindrical body. A transformer case is provided with heat dissipation fins, and the contents of the transformer are accommodated together with insulating oil in the contents storage section of the transformer case to form a transformer. In addition to improving cooling performance by making it common with the transformer case and by using heat dissipation fins provided on the side plate of the contents storage part, it is also possible to improve the cooling performance by making it possible to install it near the top of the utility pole without using pole mounting materials such as pole mounting arms. To provide a pole-mounted power distribution transformer that can be mounted on a pole without spoiling the cityscape.

[Example of idea]

Embodiments of the present invention will be described below with reference to FIGS. 1 to 6.

Reference numeral 1 denotes a transformer case, and its structure, as shown in FIGS. 1 and 5, consists of a cylindrical body 1a formed from a steel plate into a cylindrical shape, and a pair of side plates 1b inserted into the cylindrical body 1a. The side ends of each side plate 1b are welded to the inner circumferential surface of the cylinder body 1a, with a substantially crescent-shaped cavity 2 being formed between the flat plate surface of the side plate 1b and the inner circumferential surface of the cylinder body 1a. In the center of the cylindrical body 1a, there is formed a content accommodating portion 1c having a substantially elliptical cross section for accommodating the transformer content 6. Reference numeral 3 denotes a corrugated heat dissipation fin protruding toward the inside of the cavity 2 on the side plate 1b constituting the contents storage part 1c; 4 denotes a bottom plate of the contents storage part 1c;
Reference numeral 5 denotes a cover formed in a substantially oval shape similar to the bottom plate 4, and the cover is installed in an oil-tight manner by tightening bolts to a flange portion 1d provided around the inner side of the upper opening end of the contents storage portion 1c through a gasket. Installed. Reference numeral 6 denotes the contents of the transformer stored together with insulating oil in the contents storage part 1c of the case 1, 7 and 8 a high-voltage bushing and a low-voltage bushing installed on the cover 5, and 9 a lower part in the center of the bottom plate 4 of the contents storage part 1c. A cylindrical support tube protrudes toward the support tube 9.A plurality of support plates a are arranged around the support tube 9 at a predetermined distance from the support tube 9, as shown in FIGS. 3 and 6. is attached to the lower side of the bottom plate 4 facing downward. Reference numeral 10 is a hollow steel pipe telephone pole, and the vicinity of its top is crossed and divided into two parts. Of the utility poles 10 divided into two, a skirt-shaped upper cover tube 12 that covers the upper part of the transformer is welded to the lower end of the upper utility pole 11a, and to the upper end circumferential surface of the lower utility pole 11b,
A fixing plate b is attached at a position corresponding to the supporting plate a protruding from the bottom plate 4 of the contents storage part 1c. 13
is a funnel-shaped lower cover that covers the underside of the transformer.
It is formed by being divided into two parts in the vertical direction, and a large number of air holes 14 are bored in the funnel part. Further, an air vent hole 15 is bored in a portion corresponding to the heat dissipation fin 3 on the upper part of the cylinder 1a constituting a part of the contents accommodating portion 1c. 16 is an insulator for holding the high-voltage side distribution line provided at the upper end of the upper utility pole 11a, and 17 is the lower utility pole 11.
an insulator for holding the low-voltage side distribution line installed at the upper end of b;
Reference numeral 18 denotes a lid body that covers an operation window (not shown) opened on the opposite side of the insulator 16 of the upper utility pole 11a.

Next, the case of assembling and mounting the transformer of the present invention on a pole will be explained.

First, the transformer contents 6 are installed in the contents storage part 1c of the transformer case 1, and insulating oil is injected, and then the cover 5 is attached to the upper open end of the contents storage part 1c, and the transformer X is assembled. finish. Next, when mounting the transformer X on a pole, as shown in FIG. , lower utility pole 1
Insert it into the upper open end of 1b. After this, the support plate a protruding from the bottom plate 4 of the case 1 and the lower utility pole 11b are attached.
The fixing plate b attached to the lower utility pole 11b is fixed with tightening bolts and nuts as shown in FIG. 6, and the transformer X is mounted and fixed on the lower utility pole 11b. Next, connect the connecting wire c to the low-voltage bushing 8, let the connecting wire c hang down inside the cavity 2 of the case 1, and pull it out from the air hole 14 of the lower cover tube 13, which is divided into two, and connect the lower utility pole 11b.
Connect to the conductive part of the insulator 17 attached to the insulator 17. After the connection line c is connected, the lower cover tube 13 divided into two parts is fixed to the lower peripheral edge of the transformer X with tightening bolts to cover the lower part of the transformer X. Next, connect the connecting wire d to the high-voltage bushing 7, insert this connecting wire d into the upper utility pole 11a, and then connect the upper utility pole 11a with the upper cover tube 12 attached to the lower side to the case 1 of the transformer Fits on top. Next, the upper cover tube 12 and the tube body 1a portion of the case 1 are connected to the hollow portion 2 of the case 1.
Use the parts to tighten the bolts and connect transformer
As shown in the figure, it is installed integrally with a telephone pole 10.
Thereafter, the connection wire d is connected to the conductive portion of the insulator 16 using the operation window (not shown) of the upper utility pole 11a, and then the operation window is covered with the lid 18. After mounting transformer X on the pole in this way, insulator 16
In addition to holding the high voltage side power distribution line (not shown in the figure),
The power distribution line and the conductive part of the insulator 16 are connected by a connection lead (not shown), and the low voltage side power distribution line is connected to the conductive part of the insulator 17 and connected to the consumer side. The connection portion between the conductive portions of the insulators 16 and 17 and the power distribution line is covered with a rubber cover (not shown).

FIG. 7 shows another embodiment of the transformer of the present invention, in which a case 1 is provided with a cylindrical body 1a formed by molding a metal plate into a keyhole shape with one side open. In the same manner as described above, a side plate 1b is welded into the body 1a to form a content storage part 1c having a substantially elliptical cross section, and when it is attached to a utility pole 10,
The hanger seat 19 attached to the side plate 1b located on the side of the open end 1a1 of the cylindrical body 1a is fixed to the transformer mounting bracket 20 fastened to the utility pole 10 to be installed on the pole. After installing the pole, the high-voltage bushing 7 and the high-voltage side distribution line (not shown) are connected by a connecting wire, and the low-voltage bushing 8 is connected to a connecting wire, which is suspended inside the cavity 2 of the case 1 and connected to the outside of the case 1. Connect this connection line to the customer side drop-in line.

Furthermore, although the present invention has been described with reference to an example in which the corrugated heat dissipation fins 3 are attached to the side plate 1b, a heat dissipation fin formed directly on the side plate 1b may be used as the side plate of the case.

Furthermore, instead of forming the lower cover tube 13 into a funnel shape by forming an iron plate with air holes 14 therein, a wire mesh may be stretched in the shape of a funnel.

In addition, in the case of underground wiring, high and low voltage distribution lines are directly routed through the utility poles through high and low voltage bushings 7,
8 may be connected.

Incidentally, the case 1 may be made vertically long to accommodate a plurality of transformers.

[Effect of idea]

Since the present invention is configured as described above, it has the following effects.

The present invention uses a pair of side plates at the center of a cylindrical body to form a content storage part with an approximately oval cross section, which shares a part with the cylinder body, and the side plates of the content storage part have a pair of side plates. Since a cylindrical transformer case is constructed by arranging a large number of heat dissipating fins in the cavity inevitably created between the side plate and the inner peripheral surface of the cylinder, the contents of the transformer can be stored in the contents storage area. The insulating oil contained therein can be cooled well because the heat dissipation fins and a part of the contents storage part are formed in common with the transformer case.
It becomes possible to effectively suppress the temperature rise of the transformer. In addition, the heat dissipation fins are arranged without being exposed to the outside by effectively utilizing the hollow part of the transformer case, so that they can be installed on utility poles without increasing the size of the transformer case. It also has the advantage of being able to be manufactured in the same shape as the one without compromising its aesthetic appearance.

Furthermore, when a transformer case is mounted on a pole with the contents of the transformer contained therein, even though the lower part is covered by the upper and lower cover tubes, the lower cover tube has a cavity inside the case. Since a large number of communicating air holes are perforated, the heat dissipation fins arranged in the cavity ensure that outside air can circulate well into the cavity through the air holes even if the heat dissipation fins are surrounded by the transformer case. This is the same as constantly exposing the transformer to the outside air, so the cooling effect of the transformer can be maintained even better.

Furthermore, even though the part that accommodates the transformer's contents is oval, the outer shape of the transformer case is circular, so when it is mounted on a utility pole, the case is slightly larger in diameter than the utility pole. Moreover, since it has the same shape as a telephone pole, it does not spoil the aesthetic appearance of the city. Moreover, since the upper and lower parts of the transformer are covered with skirt-like covers, the transformer's accessories such as high and low voltage bushings and the heat dissipation fins are not exposed to the outside at all. Since no pillar supports are used, it is possible to install pillars while maintaining a good urban landscape.

Furthermore, the connection between the distribution line and the transformer can be made by effectively utilizing the space in the upper utility pole or the cavity in the transformer case, which simplifies the external shape of the transformer as described above. Coupled with this, it becomes possible to provide a pole-mounted power transformer for power distribution that does not spoil the aesthetic appearance of the city.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view showing the pole-mounted state of the transformer of the present invention, FIG. 2 is a cross-sectional view taken along line A-A in FIG. 1,
Fig. 3 is an explanatory diagram showing the case where the transformer of the present invention is mounted on a pole, Fig. 4 is a sectional view taken along the line B-B in Fig. 1,
Figure 5 is a sectional view taken along line C-C in Figure 1;
The drawings are a sectional view taken along the line D--D in FIG. 1, FIG. 7 is a side view showing another embodiment of the transformer of the present invention, and FIG. 8 is a plan view. 1...Case, 1a...Cylinder, 1b...Side plate,
1c...Contents storage section, 2...Cavity part 3...Radiation fin, 4...Bottom plate, 5...Cover, X...Transformer.

Claims (1)

[Scope of utility model registration request] A pair of side plates 1b are attached to a cylindrical body 1a so as to have a crescent-shaped cavity 2 between them and the inner peripheral surface of the cylindrical body 1a, and a bottom plate 4 is provided at the center of the cylinder 1a. , and forms a cylindrical transformer case 1 having a content housing part 1c having a substantially elliptical cross section in common with the cylindrical body 1a, and the crescent-shaped cavity 2 of this case 1. , a plurality of heat dissipating fins 3 attached to the side plate 1b of the contents storage part 1c are installed.
A side plate 1b is provided with a heat dissipating fin 3.
The transformer X is constructed by accommodating the transformer contents 6 together with insulating oil in the contents accommodating portion 1c formed by the above, and covering the cover 5 with high and low voltage bushings attached to the upper open end. , the transformer is mounted and fixed on the lower utility pole 11b, which is divided into two parts near the top, via the bottom plate 4 of the contents storage part, and the lower part of the cylindrical case 1 of the transformer X and the upper part of the lower utility pole 11b are separated. A funnel-shaped lower cover tube 13 with a large number of air holes 14 is installed between the periphery and the lower portion of the transformer X,
The upper part of the transformer X is covered with a skirt-like upper cover 12 attached to the lower end of the upper utility pole 11a, and the upper utility pole 11a is attached to the transformer X with the upper part of the transformer X covered. A pole-mounted power transformer for power distribution, which is characterized by: