JPH0794344A - Transformer - Google Patents

Abstract

PURPOSE:To relax the electric field applied to a winding on the low voltage side by a method wherein winding layers composing the winding on the low voltage side are gradually lessened in height, and the lower and upper ends of the winding layers are so arranged as to form a flight of steps respectively. CONSTITUTION:Winding layers 2A of a winding 2 on the low voltage side close to a winding 3 of the high voltage side are gradually increased in height with a distance from the winding 3, whereby the lower and upper ends of the winding layers 2A are so arranged as to form a flight of steps respectively. By this constitution, an electrical field is produced conforming to the shape of the lower and upper ends of the winding 2 on the low voltage side when a voltage is applied to the winding 3 on the high voltage side, and as the lower and upper ends of the winding layers 2A close to the winding 3 on the high voltage are so arranged as to form a flight of steps respectively, an electric field becomes smooth, and consequently an electric field produced in the winding 2 on the low voltage side can be relaxed without providing a shield.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION This invention relates to transformers.

[0002]

2. Description of the Related Art A low-voltage winding wound in a cylinder is wound around an iron core leg.
Further, a transformer having a structure in which a high voltage side winding, which is wound around a disk, is wound around the outer circumference thereof is already well known. FIG. 2 shows the conventional configuration, 1 is an iron core leg, 2 is a low voltage side winding, 3 is a high voltage side winding, and 4 is a shield for the high voltage side winding, and has the same potential as the high voltage side winding. The low voltage side winding 2 is configured by concentrically winding a plurality of layer windings 2A that are cylindrically wound, and the high voltage side winding 3 is configured by a plurality of stage windings 3A that are disk-wound. is there. The figure shows a cross section of the right half of the iron core leg 1.

In a transformer having such a structure, in order to alleviate an electric field on the low voltage side winding 2 side generated when a voltage is applied to the high voltage side winding 3, conventionally, a ground potential or a low voltage side winding is used. The cylindrical shield 5 having the same potential is installed between the low voltage side winding 2 and the high voltage side winding 3.

However, when the shield 5 is provided in this way,
It is necessary to secure an installation space for the shield 5 between the low voltage side winding 2 and the high voltage side winding 3, and therefore a large distance d1 between the high voltage side winding 3 and the shield 5 is required. Not only that, it becomes a large transformer. Further, the work for manufacturing the shield 5 is troublesome and expensive.

[0005]

SUMMARY OF THE INVENTION According to the present invention, an electric field generated on the low voltage side winding side can be relaxed without providing a conventional shield between the low voltage side winding and the high voltage side winding. To aim.

[0006]

According to the present invention, among the respective layer windings of the low voltage side winding, a plurality of layer windings approaching the high voltage side winding are arranged so that the upper and lower ends thereof are stepwise. It is characterized in that the height of the winding is gradually reduced toward the winding on the high voltage side.

[0007]

When a voltage is applied to the high voltage side winding, an electric field is generated in the low voltage side winding along the height of the layer winding of the low voltage side winding. However, since the upper and lower ends of the layer winding are deformed stepwise, the electric field at both ends of the layer winding does not become steep but becomes smooth, and the electric field generated in the low voltage side winding is relaxed. Become. If round wires are provided as shield wires at both upper and lower ends of the layer winding, the electric field can be more effectively relaxed.

Further, if the average height of the winding on the low-voltage side, which is lowered stepwise, is made the same as the height of the winding on the high-voltage side, and the center positions of the heights of the windings are made the same, the axial machine at the time of a short-circuit accident will occur. The force can be the same as before, and the distance between the shield of the high voltage side winding and the low voltage side winding can be made larger than the distance between the high voltage side winding and the low voltage side winding. Therefore, the electric field of the shield of the high voltage side winding can be relaxed.

[0009]

Embodiment An embodiment of the present invention will be described with reference to FIG. In addition, the same reference numerals as those in FIG. 2 indicate the same or corresponding portions. According to the present invention, the layer winding 2 of the low voltage side winding 2
Among the plurality of layer windings of A, which are closer to the high-voltage winding 3, the heights thereof are sequentially lowered toward the high-voltage winding 3, so that the upper and lower ends of the plurality of layer windings 2A are Make it step-like.

According to such a configuration, an electric field is generated on the low voltage side winding 2 side due to the voltage applied to the high voltage side winding 3, but the electric field is in the shape of the upper and lower ends of the low voltage side winding 2. Occur along. However, since the upper and lower ends of the plurality of layer windings 2A that are close to the high voltage side winding 3 are stepwise as described above, the electric field is smoothed and relaxed.

In this case, the height of each layer winding 2A is lowered.
If the shielded wire 6 made of a round wire is installed along both upper and lower ends of the electric field, the electric field becomes smoother and relaxed.

Further, the average height of the low-voltage side winding 2 which is stepwise lowered is made equal to the height of the high-voltage side winding 3, and each winding 2, 3
If the central positions of the heights are the same, the axial mechanical force at the time of short circuit caused by the height difference between the low-voltage side winding 2 and the high-voltage side winding 3 can be made to a conventional level. Further, since the distance d3 between the low voltage side winding 2 and the shield 4 is longer than the distance d2 between the both windings 2 and 3, the electric field of the shield 4 can be relaxed, and the distance d2 is longer than the distance d1. Can be shortened.

[0013]

As described above, according to the present invention, the height of the low-voltage side winding is sequentially decreased, and the upper and lower ends thereof are stepped, so that the electric field applied to the low-voltage side winding is reduced. Since it is designed to be relaxed, it is possible to omit the use of a conventional cylindrical shield, and it is possible to reduce the size of the transformer by omitting this shield, as well as the axial mechanical force during a short circuit. The effect that can be made to the conventional level is exhibited.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a sectional view showing a conventional example.

[Explanation of symbols]

 1 core leg 2 low voltage side winding 2A layer winding 4 shield for high voltage side winding 3 high voltage side winding 6 shielded wire

Claims (3)

[Claims] 1. A transformer in which a low voltage side winding is wound around an iron core leg, and a high voltage side winding is wound around an outer circumference of the low voltage side winding. A transformer in which the height of each layer winding is gradually lowered toward the high-voltage side winding so that the upper and lower ends of the plurality of layer windings approaching the side winding are stepwise. 2. The transformer according to claim 1, wherein among the layer windings of the low voltage side winding, shield wires made of round wires are provided at both upper and lower ends of the layer winding whose height is lowered. 3. The average height of the low voltage side winding which is stepwise lowered is made the same as the height of the high voltage side winding, and the center positions of the low voltage side winding and the high voltage side winding are made the same. Or claim 2
Transformer described in.