JP2014236133A - Pole transformer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pole transformer the work man-hours of which is reduced by fixing the transformer body in a transformer case, the service life of which can be prolonged by making the bottom plate less likely to rust.SOLUTION: A pole transformer 1 is constituted of a transformer body 10 and a transformer case 20. The lower core fastener 14 of the transformer body is provided with a lower core fastening protrusion 14c vertically downward. A bottom plate recess 22a is provided in the bottom plate 22 of the transformer case, and the lower core fastening protrusion is fitted in the bottom plate recess.

Description

The present invention relates to a structure for disposing a transformer body on a bottom plate of a transformer tank in a transformer body composed of an iron core and windings.

  As a prior art related to the present invention, for example, as shown in FIGS. 1A and 1B of Patent Document 1, a transformer main body 2 is provided by a transformer main body steady rest 3 welded to a bottom wall portion 1a. Arranged in the proper position. Further, as shown in FIG. 1 of Patent Document 2, a reinforcing seat 12 is welded to the outer periphery of the bottom portion a2, and serves as a base when the transformer is erected on the ground.

JP-A-9-63856 JP 2001-6944 A

  In FIG. 1 of Patent Document 1, since the transformer main body steady rest 3 needs to be fixed to the bottom wall 1a by welding, there is a problem that many man-hours are required for the work. Further, FIG. 1 of Patent Document 2 has a problem that water droplets are likely to adhere to the joint between the bottom portion a2 and the reinforcing seat 12 (water drainage is bad), and the corrosion progresses quickly at that portion.

  The present invention is intended to solve these problems, and can be prevented by simple means so that the transformer body can be placed at an appropriate position at the bottom, and further, corrosion of the bottom of the outer appearance of the transformer can be suppressed. The purpose is to provide a pole transformer.

In order to achieve the above object, the invention of claim 1
A transformer body in which windings are wound around the outer periphery of the iron core, and an upper core fastener and a lower core fastener are respectively disposed at the upper end and the lower end of the iron core;
The transformer body is housed inside, and a transformer case composed of a side plate and a bottom plate,
In the pole transformer with
The lower core fastening bracket of the transformer body is provided with a lower core fastening projection vertically downward,
The bottom plate of the transformer case is provided with a bottom plate recess having a depression vertically downward,
It is a pole transformer in which the lower core fastening convex portion is fitted into the bottom plate concave portion.

  The invention according to claim 2 is the pole transformer according to claim 1, wherein at least three bottom plate recesses are provided in the bottom plate.

  The invention according to claim 3 is the pole transformer according to claim 1 or 2, wherein the side plate and the bottom plate are made of a steel plate, and the thickness of the steel plate is larger in the bottom plate than in the side plate.

  According to the present invention, the steady rest can be performed by simple means so that the transformer main body can be arranged at an appropriate position on the bottom plate, and further, corrosion of the bottom plate of the transformer appearance can be suppressed.

(A) shows the front sectional view of the pole transformer in the embodiment of the present invention, and (B) shows the bottom view. (A) is a top view of the lower core fastener in the embodiment of the present invention, and (B) shows a front view.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

  In FIG. 1, a pole transformer 1 mainly includes a transformer body 10 and a transformer case 20 that houses the transformer body 10 therein. The transformer case 20 is filled with insulating oil (not shown) for cooling heat loss such as load loss and no-load loss consumed in the transformer body 10.

  First, the transformer body 10 will be described. In the transformer body 10, a winding 11 is wound around the outer periphery of an iron core 12, and an upper core fastener 13 and a lower core fastener 14 are disposed at the upper end and the lower end of the iron core 12, respectively. Further, an upper coil base 15 is disposed between the upper core fastener 13 and the winding 11, and a lower coil base 16 is disposed between the lower core fastener 14 and the winding 11.

After such a configuration, the core fastening band 17 is further penetrated from the upper surface of the upper core fastener 13, the outer periphery of the iron core 12 is moved and moved downward, and the lower core fastener 14 is penetrated. The bottom surface of the lower core fastener 14 is turned over, and again penetrates from the bottom surface of the lower core fastener 14, the outer periphery of the iron core 12 is turned up and moved upward, and the upper core fastener 13 is passed through again in FIG. As shown, the upper and lower core fasteners 13 and 14 and the iron core 12 are made to wrap around, and finally, the upper end of the upper core fastener 13 is connected to both ends of the core fastening band and tightened.

With such a configuration, the force that the upper and lower core fasteners 13 and 14 attract each other is generated by the tightening force of the core tightening band 17, and the force that the upper and lower coil mounts 15 and 16 attract is generated by the force. By doing so, the winding 11 is fixed between the upper and lower coil bases 15 and 16. Further, the core 12 itself is also tightened and fixed by the tightening force of the core tightening band 17. As described above, the transformer body 10 has an integral structure in which each member is fixed.

  Next, the configuration of the transformer case 20 will be described. The transformer case 20 includes a side plate 21 and a bottom plate 22. In addition, two seats 21a for screwing bolts are provided on the inner upper portion of the side plate 21, as shown in FIG. The role of the seat 21a will be described later. Note that a cover is provided on the upper end of the transformer case 20 and a bushing or the like is also provided on the side plate 21, but this is omitted because it is not related to the features of the present invention.

  Here, the structure which fixes the transformer main body 10 inside the transformer case 20 will be described.

  Normally, the pole transformer 1 is not provided with fixing means for the transformer main body 10 due to transportation or the like, and the transformer main body 10 in the transformer case 20 swings. It is necessary to fix (stabilize) the inside of 20 by some means. In the present embodiment, means for fixing (stabilizing) each inside the transformer case 20 is provided at the upper and lower parts of the transformer body 10.

  First, the fixing means to the transformer case 20 in the upper part of the transformer main body 10 of FIG. 1 will be described. In the present embodiment, two L-shaped upper steady rests 41 are used for fixing. One end of the upper steady rest fitting 41 is fixed to the upper surface of the upper core fastening bracket 13 with a bolt, and the other end is fixed to the seat 21a of the side plate 21 with a bolt. By providing such a configuration at two symmetrical positions in the transformer case 20, the upper part of the transformer body 10 is fixed inside the transformer case 20. However, this is not sufficient, and the lower part of the transformer body 10 must be fixed (stabilized), and the present invention is characterized by this configuration and will be described below.

  The structure of the bottom plate 22 of the transformer case 20 and the lower core fastener 14 will be described for fixing (resting) in the lower part of the transformer main body 10 that is a feature of the present invention.

  As shown in FIG. 1, the bottom plate 22 is provided with four bottom plate recesses 22 a having depressions formed vertically downward when the pole transformer 1 is installed on the utility pole. This is a device dedicated to the bottom plate 22 vertically downward, and is formed by pressing or pressing. As shown in FIG. 1B, the four bottom plate recesses 22a are arranged on the bottom plate 22 so as to be scattered at a balanced position when the pole transformer is erected. Since the pole transformer 1 is erected at the bottom plate recess 22a, the bottom plate 22 is sufficiently thicker than the side plate 21 and is a portion that is in contact with the ground.

The structure of the lower core fastener 14 will be described with reference to FIG. The lower core fastener 14 includes a bottom plate portion 14a, an upright portion 14b, and a lower core fastening convex portion 14c. The bottom plate portion 14a is in contact with the bottom plate 22 of the transformer case 20, and an upright portion 14b is provided at an end portion thereof. The standing portion 14b plays a role of arranging the lower coil base 16 at an appropriate position. Further, the bottom plate portion 14a is provided with two lower core fastening convex portions 14c in which convex portions are formed vertically downward when the pole transformer 1 is installed on the utility pole. The core fastening projection 14c is also formed by pressing or pressing with a dedicated device vertically downward.

When the transformer main body 10 is arranged inside the transformer case 20 with the above configuration, the transformer main body 10 is assembled and then lifted, put into the transformer case 20, and the two core fastening projections 14c. Is fitted into two bottom plate recesses 22a out of the four bottom plate recesses 22a, so that the lower part of the transformer body 10 can be fixed (stabilized). Thereafter, as described above, the transformer body 10 can be fixed in the transformer case 20 by fixing (resting) the upper part of the transformer body 10 with the upper clasp 41.

  In the present invention, it is necessary to place the pole transformer 1 on the ground only when the transformer is manufactured, transported, or stored. At that time, the bottom plate recess 22a is burdened by its own weight. However, once suspended on the pillar, the bottom plate recess 22a is not burdened at all, and the burden is generated only for a short period of time, which is particularly effective in the pillar transformer.

  Furthermore, when a reinforcing seat (base) is provided on the bottom plate as shown in the prior art, water droplets are apt to adhere to the joint portion. This promotes the progress of rust and causes a deterioration in the life of the transformer. However, the bottom plate 22 of the present invention has no structure in which such water droplets are likely to adhere, but rather plays a role of dropping water droplets in the bottom plate recesses. Is difficult to adhere for a long time. Therefore, since it is a structure which is hard to generate | occur | produce rust, lifetime extension can be aimed at compared with the conventional structure.

  Furthermore, according to the present invention, there is no need to provide a reinforcing seat (base) by welding on the bottom surface of the bottom plate as shown in the prior art, and there is no need to provide a steady rest metal fitting by welding on the top surface of the bottom plate. Improvement can also be achieved.

  In the present embodiment, the bottom plate concave portion and the lower core fastening convex portion are hemispherical, but the shape of the bottom plate concave portion is not particularly limited as long as it is a shape in which water droplets can be easily dropped.

  In addition, although four bottom plate recesses are provided in this embodiment, it is sufficient to provide at least three or more in order to erect the pole transformer, and two lower plate tightening projections are also provided in this embodiment. However, there is no problem if at least one is provided. In the present embodiment, the lower core fastener is fitted in the bottom plate recess in two places, but there is no problem if the construction is fitted in at least one place.

DESCRIPTION OF SYMBOLS 1 Pillar transformer 10 Transformer main body 11 Winding 12 Iron core 13 Upper core fastener 14 Lower core fastener 14c Lower core fastening convex part 20 Transformer case 21 Side plate 22 Bottom plate 22a Bottom plate concave part

Claims (3)

A transformer body in which windings are wound around the outer periphery of the iron core, and an upper core fastener and a lower core fastener are respectively disposed at the upper end and the lower end of the iron core;
The transformer body is housed inside, and a transformer case composed of a side plate and a bottom plate,
In the pole transformer with
The lower core fastening bracket of the transformer body is provided with a lower core fastening projection vertically downward,
The bottom plate of the transformer case is provided with a bottom plate recess having a depression vertically downward,
A pole transformer in which the lower core fastening convex portion is fitted in the bottom plate concave portion.   The pole transformer according to claim 1, wherein at least three bottom plate recesses are provided on the bottom plate.   3. The pole transformer according to claim 1, wherein the side plate and the bottom plate are made of a steel plate, and the thickness of the bottom plate is larger than that of the side plate.

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