JPH09148145A - Doughnut-shaped pole transformer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To lessen the danger of the collapse of a doughnut type pole transformer due to the earthquake or the like and also to finish by simply digging down shallow the ground at the time of the erection of an electric-light pole by a method wherein two pieces of partial bodies, which consist of a core of a circular arc-shaped section and primary and secondary coils, which are formed by winding coils on the outside of the core, are combined with each other to form then into a doughnut shape. SOLUTION: Two pieces of partial bodies, which consist of a core 2 of a circular arc-section and primary and secondary coils 3 and 4, which are formed by winding coils on the outside of this core 2, are combined with each other by clamping fitments 5 to form them into a hollow daughnut shape and a support fitment 6 is arranged on the inner peripheral surface and bottom of a daughnut type pole transformer. Moreover, an insulating treatment is performed between the core 2 and the coil 3, between the coils 3 and 4, between the coil 4 and the fitments 5, between the coil 4 and the fitment 6 and on the upper surface of the doughnut-shaped pole transformer with a resin. The transformer is formed into a dry transformer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pole transformer for electric power installed on a utility pole, and its purpose is to prevent the eccentric load from being applied to the utility pole at the time of installation and to improve the stability of the pole. It is to provide an upper transformer.

[0002]

2. Description of the Related Art In a conventional pole transformer, as shown in FIG. 5, a transformer body, in which a coil (12) and an iron core (2) are arranged, is placed in an outer box (11) made of a substantially cylindrical iron plate. It was housed and the space between the outer box (11) and the transformer body was filled with electrical insulating oil.

[0003]

However, because of the structure of the conventional transformer as described above, when it is attached to a utility pole, it has to be fixed to a part of the outer surface of the utility pole. Therefore, a moment load is applied to the utility pole after the transformer is installed only in one direction, that is, the side where the transformer is installed, and the structure becomes unstable and there is a great risk of collapse due to an earthquake. In order to reduce the number of poles, it was necessary to dig the ground deep underground and bury the bottom of the poles when erected the poles.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and in a donut type pole transformer according to claim 1, an iron core having a semi-circular cross section and the iron core. It is assumed that the two partial bodies each having the primary coil and the secondary coil wound on the outer side of are combined to form a donut shape. The donut-type pole transformer according to claim 2 is the donut-type pole transformer according to claim 1, which is a dry type transformer.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a toroidal pole transformer according to the present invention will be described below with reference to the drawings. 1 is an external view showing an example of an embodiment of a donut type pole transformer (1), FIG. 2 is a cross-sectional view of FIG. 1, and FIG. 3 is FIG.
FIG. A toroidal pole transformer (1) according to this example includes an iron core (2) having a semi-circular cross section and primary coils (3) and 2 wound around the iron core (2).
The partial body consisting of the next coil (4) is combined with the fastener (5) to form a hollow donut shape.
Receiving metal fittings (6) are arranged on the inner peripheral surface and the bottom surface.
Further, between the iron core (2) and the primary coil (3), between the primary coil (3) and the secondary coil (4), the secondary coil (4), the fastening fitting (5) and the receiving fitting (6). And the upper surface of the donut type pole transformer (1) are insulated with a resin (7). The resin (7) is not particularly limited as long as it has excellent electric insulation properties and can withstand a higher temperature than the electric insulating oil used in a general pole transformer.
Epoxy resins are preferably used.

A primary connection terminal (8) and a secondary connection terminal (9) are provided on the upper part of the partial body, and the primary connection terminal of one partial body is connected via the primary connection terminal (8). Coil (3)
Is connected to the starting line of the primary coil (3) of the other partial body, and the ending line of the secondary coil (4) of the one partial body and the other line are connected via the secondary connection terminal (9). The starting line of the secondary coil (4) of the partial body is connected. In this way, by connecting the coils of the two partial bodies via the primary connection terminal (8) and the secondary connection terminal (9), one doughnut-shaped transformer as a whole is configured. .

Of course, it is also possible to use only one partial body as a transformer without connecting the coils of the two partial bodies as described above. In this case, the two partial bodies are used. It can be used as a transformer with half the input / output voltage specifications when connected to. A tap for switching (not shown) is used for changing the connection form, that is, changing the input / output voltage.
According to need, it is possible as appropriate.

As the iron core (2), in order to reduce the iron loss due to the eddy current loss, a wound iron core in which an iron plate is wound in multiple layers is preferably used like the conventional pole transformer. Although not shown, a fold, a radiator, or a fan for cooling the transformer may be provided on the fastening member (5) or the receiving member (6).

The doughnut-shaped transformer (1) having the above structure is
It is attached to a utility pole (10) as shown in FIG. That is, after the electric pole (10) is sandwiched by the two partial bodies, the bolt of the fastener (5) is tightened,
The donut-shaped pole transformer (1) is clamped and fixed to an electric pole (10). As described above, since the transformer according to the present invention is attached with a structure in which the electric pole (10) is held in the donut-shaped pole transformer (1), an eccentric load is applied to the electric pole like a conventional pole transformer. It does not hang. In addition, telephone pole (1
0) is not limited to the example shown in FIG. 4, but for example, a configuration in which a donut-shaped receiving metal fitting is installed on the electric pole (10) and the donut-shaped pole transformer (1) is placed thereon. Can also be

[0010]

As described above, according to the present invention, a donut is formed by combining two iron cores each having a semi-circular cross section and a primary coil and a secondary coil wound around the iron core. The donut type pole transformer characterized by being shaped and the dry type pole transformer according to claim 1, which are dry type transformers, and thus have the following effects. . That is, when the transformer is mounted on the utility pole, since the utility pole is mounted with a structure in which it is held in the transformer, the eccentric load is not applied to the utility pole unlike the conventional pole transformer. Therefore, the utility pole is stable, the risk of collapse due to an earthquake or the like can be reduced, and the digging of the ground when the utility pole is erected can be made shallower than before. Further, unlike the prior art, it is not necessary to provide a projecting rod for mounting the transformer on the electric pole, which is excellent in appearance and the mounting work is easy.

[Brief description of the drawings]

FIG. 1 is an external view showing an example of an embodiment of a toroidal pole transformer according to the present invention.

FIG. 2 is a cross-sectional view of FIG.

FIG. 3 is a sectional view taken along line AA of FIG. 1;

FIG. 4 is a diagram showing an example of a method of attaching the donut-type pole transformer according to the present invention to a telephone pole.

FIG. 5 is a partially cutaway external view showing a conventional pole transformer.

[Explanation of symbols]

 1 Donut type pole transformer 2 Iron core 3 Primary coil 4 Secondary coil

Claims (2)

[Claims] 1. A donut shape is obtained by combining two iron cores each having a semi-circular cross section and a primary coil and a secondary coil that are wound around the iron core. Donut pole transformer. 2. The toroidal pole transformer according to claim 1, which is a dry type transformer.