JPH08115822A - Pole transformer for power distribution - Google Patents

Abstract

PURPOSE: To provide a pole transformer in which a distribution line is drawn to be extremely short and simple from a high-voltage overhead distribution line up to a high-voltage bushing for the pole transformer for power distribution, in which the safety of an operation on a pole is enhanced and which prevents the insulating performance of the high-voltage bushing from being lowered due to the stain and the damp of its surface. CONSTITUTION: A high-voltage-side bushing 4 is attached to the bottom plate face 12 of an outer-box body 1 for a transformer. A distribution line from a high-voltage pin insulator up to the high-voltage-side bushing 4 is wired at a shortest distance. The outer-box body 1 is constituted so as to play a role as a cover against dust and as an umbrella against rainwater.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pole-mounted transformer for distribution, and more particularly to a pole-mounted transformer in which power is supplied from an overhead distribution line to a high-voltage winding through a high-voltage side bushing. Regarding pole transformers.

[0002]

2. Description of the Related Art Conventionally, a pole-mounted transformer for distribution mounted on a utility pole includes an iron core, high-voltage and low-voltage windings arranged around the iron core, and an outer box accommodating the windings. It consists of a main body and a high-voltage side bushing that supplies power to the high-voltage winding from an overhead distribution line.

A high-voltage side bushing for supplying electric power to the high-voltage winding from an overhead distribution line is usually attached to the upper side surface of the outer box body of the transformer.

Further, the wiring from the high-voltage overhead distribution line to the high-voltage side bushing of the transformer is temporarily fixed by pulling it down to the high-voltage pin insulator attached to the lower portion of the distribution pole transformer. It is common to start up to a high voltage bushing for a distribution pole transformer.

[0005]

In the above-mentioned conventional structure, since the high voltage side bushing is attached to the upper side surface of the outer box body of the distribution pole transformer, dust is attached to the surface of the high voltage side bushing. However, there is concern that the insulation performance of the bushing surface may deteriorate due to stains and wetting.

Further, the wiring from the high-voltage overhead distribution line to the high-voltage side bushing of the transformer is temporarily fixed by pulling down to a high-voltage pin insulator attached to the lower part of the distribution pole transformer. Since the high voltage bushing of the distribution pole transformer is started up, the wiring route is complicated and there is a problem in safety such as electric shock when working on the pole.

[0007] The present invention has been made in view of the above points,
The purpose is to shorten and simplify the wiring from the high-voltage overhead distribution line to the high-voltage bushing of the distribution pole transformer, and to improve the safety when working on the pole. , A high voltage bushing surface is provided with a pole transformer for distribution, which can prevent the insulation performance from being deteriorated due to contamination and wetting.

[0008]

The present invention is characterized in that the high-voltage side bushing of a pole pole transformer for distribution is attached to the bottom surface of the outer box body of the transformer.

[0009]

In the present invention, since the high voltage side bushing is attached to the bottom body of the transformer outer box, the wiring from the high voltage pin insulator located below the transformer to the high voltage side bushing is the transformer outer box. It can be connected without passing through the vicinity of the side of the main body, and because the high voltage side bushing is located at the bottom of the transformer outer case body on the extension of the side of the transformer outer case body, The outer box body serves as a cover for dust and the like falling from the upper part and as an umbrella for rainwater, and can prevent deterioration of the insulating performance of the bushing surface due to stains and wetting.

[0010]

The present invention will be described below based on the illustrated embodiments.

FIG. 1 is a side view showing an embodiment of a distribution pole transformer according to the present invention, partially broken away.

Power distribution pole transformer 2 of this embodiment shown in FIG.
0 is an outer iron type transformer composed of a low voltage winding (not shown) arranged inside a high voltage winding 2 molded with a resin such as epoxy, and an iron core 3 made of metal or glass fiber. Outer box body 1 made of synthetic resin such as reinforced plastic
The upper lid 13 made of the same material as that of the outer box body 1 is fastened with an upper lid fastening metal fitting 14.

In this embodiment, the high voltage side bushing 4 for supplying electric power from the overhead distribution line to the high voltage winding 2 is
It is attached to a part of the bottom plate 12 of the outer box body 1.

FIG. 2 shows an example in which a pole-mounted transformer for distribution according to an embodiment of the present invention is mounted on a pole.

As shown in the figure, a distribution pole transformer 20 according to an embodiment of the present invention includes a transformer band 21 and a utility pole 22.
The high-voltage pull-down wire 25 fixed to the overhead distribution line 23 is temporarily supported by the high-voltage pin insulator 24 attached to the armrest 26, and the high-voltage bushing 4 of the distribution pole transformer 20 is fixed.
Connect to.

At this time, the high-voltage side bushing 4 is positioned on the bottom surface of the distribution pole transformer 20, and in this state, the high-voltage pin insulator 24 attached to the arm bar 26 is replaced with the distribution pole transformer. A high-voltage pull-down line 25, which is provided at a position near the high-voltage side bushing 4 at the bottom of the container 20, and is once supported by the high-voltage pin insulator 24, is connected to the high-voltage side bushing 4.

According to the present embodiment, the wiring from the high voltage pin insulator 24 to the high voltage side bushing 4 of the distribution pole transformer 20 is shortest without passing near the side surface of the distribution pole transformer 20. Can be wired at a distance. Further, since the high-voltage side bushing 4 is arranged in the lower part of the outer box body 1, the falling dust is less likely to be directly attached to the surface of the high-voltage side bushing 4 by the outer box body 1, which is an effect of preventing contamination. Also has.

FIG. 3 shows another embodiment of the present invention.
The effect of preventing pollution can be expected from the above-described embodiment.

Also in this embodiment shown in the figure, a low-voltage winding (not shown) is arranged inside the high-voltage winding 2 molded with a resin such as epoxy, and the outer core type transformer is constituted by the iron core 3. Is placed in the outer box body 1 made of metal or synthetic resin such as glass fiber reinforced plastic, and the upper lid 13 made of the same material as the outer box body 1 is fastened with the upper lid fastening metal fittings 14. is there.

In this embodiment, the high voltage side bushing 4 for supplying electric power from the overhead distribution line to the high voltage winding 2 is
A part of the bottom plate 12 of the outer box body 1 is raised and the side plate 1
1 is attached to the bottom plate portion of the bushing insertion portion 5 at a portion where the outer casing main body 1 is partly invaded. The bushing insertion portion 5 is provided in a portion that is inside the bottom surface of the outer box body 1 when the high voltage side bushing 4 is attached.

As a result, the same effect as that of the embodiment shown in FIG. 1 can be obtained, and the effect against stains can be expected more than the embodiment of FIG.

It should be noted that the bushing insertion portion 5 should have a sufficient insulation distance to withstand the distribution voltage, and the bushing insertion portion 5 of the outer box body 1 should be airtight. Of course.

Further, the distribution pole transformer of the embodiment shown in FIG. 3 can be applied not only to a mold-insulated transformer but also to an oil-filled distribution pole transformer.

The transformer for underground power distribution is placed on the ground and connected to the cable in the ground. However, since the high voltage side bushing is located under the outer box of the power distribution transformer, the connection is remarkable. It will be easier.

[0025]

According to the distribution pole pole transformer of the present invention described above, since the high voltage side bushing of the distribution pole pole transformer is attached to the bottom surface of the outer box body of the transformer, the transformer pole pole transformer is mounted. The wiring from the high voltage pin insulator located under the transformer to the high voltage side bushing can be connected without passing through the side surface of the transformer outer box body, and the high voltage side bushing is connected to the transformer outer box body. Since it is placed at the bottom of the transformer outer box body on the side extension, it acts as a cover for the dust etc. falling from the upper part and an umbrella for rainwater. Since it is possible to prevent deterioration of the insulation performance of the bushing surface due to contamination and wetting, it is possible to easily route the wiring from the overhead distribution line to the high voltage side bushing of the distribution pole transformer. Inspection on the pillar, etc. Together to improve the safety at the time of work,
Since the high-voltage side bushing is located under the outer box body of the distribution pole transformer, it prevents dust falling from the outer box body from adhering to the high-voltage side bushing and prevents it from rainwater. Even if it acts as an umbrella, the surface of the bushing becomes dirty,
It is possible to prevent deterioration of insulation performance due to wetting.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of a distribution pole transformer according to the present invention partially broken away.

FIG. 2 is a perspective view showing an example in which the distribution pole transformer of the present invention is mounted on an electric pole.

FIG. 3 is a partially cutaway front view showing another embodiment of the distribution pole transformer of the present invention.

[Explanation of symbols]

1 ... Outer box body, 2 ... High voltage winding, 3 ... Iron core, 4 ... High voltage side bushing, 5 ... Bushing insertion part, 11 ... Side plate, 1
2 ... Bottom plate, 13 ... Top lid, 14 ... Top lid tightening fitting, 20
… Power distribution pole transformer, 21… Transformer band, 22… Utility pole, 23… Overhead power distribution line, 24… High voltage pin insulator, 25…
High voltage down line, 26 ... arms.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Ryozo Takeuchi 7-1-1 Omika-cho, Hitachi City, Hitachi, Ibaraki Hitachi Ltd. Hitachi Research Laboratory (72) Inventor Kenichi Natsui 7-chome, Omika-cho, Hitachi City, Ibaraki Prefecture No. 1 Hitachi Ltd. Hitachi Research Laboratory

Claims (6)

[Claims] 1. An iron core, high-voltage and low-voltage windings arranged around the iron core, an outer box body accommodating these, and electric power is supplied to the high-voltage winding from an overhead distribution line. In the distribution pole transformer, which is formed of a high voltage side bushing that is mounted on a utility pole, the high voltage side bushing is attached to the bottom surface of the outer box body. Upper transformer. 2. An iron core, high-voltage and low-voltage windings arranged around the iron core, an outer box body accommodating these, and electric power is supplied to the high-voltage winding from an overhead distribution line. In the distribution pole transformer, which is formed of a high voltage side bushing that is mounted on a utility pole, a bushing insertion portion located inside the bottom surface of the outer box body at a part of the bottom of the outer box body. And a high voltage side bushing is arranged in the bushing insertion portion. 3. An iron core, high-voltage and low-voltage windings arranged around the iron core, an outer box body accommodating the same, and electric power is supplied to the high-voltage winding from an overhead distribution line. In the distribution pole transformer, which is formed of a high-voltage side bushing that is mounted on a utility pole, the high-voltage bushing is arranged so as to be accommodated in the lower part within the range of the bottom surface of the outer box body. A pole transformer for distribution. 4. The distribution pole transformer according to claim 1, wherein the high voltage winding is molded with resin. 5. The distribution pole transformer according to claim 1, wherein the outer box body is made of metal or synthetic resin. 6. A high-voltage down wire branched from the overhead distribution line is connected to a high-voltage side bushing for supplying power from the overhead distribution line to the high-voltage winding of a distribution transformer fixed to a utility pole with a transformer band. In which the high voltage pin insulator once supported by the high voltage pin insulator is connected to the wiring, the high voltage side bushing is located on the bottom surface of the distribution transformer, and the high voltage pin insulator attached to the arm bar is It is characterized in that it is provided at a position close to the high voltage side bushing in the lower part of the distribution transformer, and the high voltage pull-down line once supported by the high voltage pin insulator is connected to the high voltage side bushing. Pole transformer for distribution.