JPS6234427Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a transformer winding, and is improved to strengthen creeping insulation at the ends of the transformer winding.

As an example to explain the conventional transformer winding, the first
The wound core transformer shown in the figure is used. As shown in the figure, two transformer windings 2 are provided on the legs of the iron core 1, and a barrier 3 is interposed between both transformer windings 2. This transformer winding 2 is
As shown in Figure 2, which extracts and enlarges a part of this,
It is manufactured by sequentially winding a low-voltage winding 5, a main insulating layer 6 made of kraft paper, and a high-voltage winding 7 on a winding frame 4. At this time, interlayer insulating papers 8a and 8b are interposed in each layer of the low voltage winding 5 and the high voltage winding 7, respectively. Both sides of the interlayer insulating paper 8b of the high voltage winding 7 are bent in a zigzag pattern. This strengthens the insulation between the high-voltage winding 7 and the iron core 1 and the creepage insulation between the ends of the high-voltage winding 7 and the ends of the low-voltage winding 5, and also prevents wire misalignment of the high-voltage winding 7. This is to prevent In other words, both ends of the interlayer insulating paper 8b formed in a zigzag pattern have the effect of insulating the end of the high voltage winding 7 and the effect of locking it. Therefore, in the conventional transformer winding 2, the folds at both ends of the interlayer insulating paper 8b are made large. As a result, the transformer winding 2 becomes larger, leading to an increase in the size of the transformer using the transformer winding 2. Note that the ends of the low voltage winding 5 are insulated with the same material as the interlayer insulating paper 8a.

SUMMARY OF THE INVENTION In view of the above-mentioned prior art, it is an object of the present invention to provide a compact transformer winding with high creepage insulation at the ends of the winding. The structure of the present invention to achieve such an object is that the transformer winding is formed by interposing a main insulating layer between a low voltage winding and a high voltage winding that are integrally wound and formed with interlayer insulating paper. The main insulating layer is a crepe paper that is wider than the interlayer insulating paper and is provided so that both ends thereof protrude, and is easy to bend.
A kraft paper is overlapped with the crepe paper and has a width equal to that of the interlayer insulating paper, and further, among the protruding parts of the crepe paper, at least those located within the window of the iron core are bent toward the high voltage winding side. It is characterized by

Embodiments of the present invention will be described in detail below with reference to the drawings. Note that parts that are the same as those in the prior art are given the same numbers and redundant explanations will be omitted.

FIG. 3 is a sectional view showing a main part of an embodiment of the present invention. As shown in the figure, the main insulating layer 9 interposed between the low voltage winding 5 and the high voltage winding 7 is
Craft paper 9a wound on top, and crepe paper 9 which is easy to bend and wound around this craft paper 9a.
It is composed of b. At this time, craft paper 9
The width of a is the same as the width of the interlayer insulating papers 8a, 8b, and its thickness is somewhat thinner than the thickness of the main insulating layer 6 of the prior art. Of course, this is compensated for by Crepe 9b. Further, the width of the crepe paper 9b is wider than that of the interlayer insulating papers 8a and 8b, and both ends thereof protrude. Of this protruding portion, the portion within the window of the iron core 1 is bent toward the high-voltage winding 7 side. Here, this folded portion is extracted and enlarged and shown in FIG. In this figure, the two-dot chain line indicates the crepe paper 9b before being folded. FIG. 5 shows an overall view of this embodiment mounted on the iron core 1. As shown in this figure, it can be seen that the crepe paper 9b inside the window of the iron core 1 is bent. Note that the aspects of the iron core 1, winding frame 4, low voltage winding 5, high voltage winding 7, and interlayer insulating papers 8a and 8b are the same as those in the prior art.

To add here, the main insulating layer 9 is made of crepe paper 9
The reason why the main insulating layer 9 was not made up of only the crepe paper 9b is that, as is well known, the crepe paper 9b has wrinkles, and if the main insulating layer 9 was made up of only this, the space factor would decrease.
Incidentally, when the main insulating layer 9 is composed only of crepe paper 9b, compared to when it is composed only of kraft paper 9a,
The space factor will drop by 20-30%.

In this embodiment, crepe paper 9 is used to partition the end of the high voltage winding 7 and the end of the low voltage winding 5.
b exists, so the creepage distance between both ends becomes long. Furthermore, since the protruding portion of the crepe paper 9b that is within the window of the iron core 1 is bent, a transformer can be manufactured using a small-sized iron core.

In the above embodiment, only the protruding portion of the crepe paper 9b within the window of the iron core 1 was bent, but it goes without saying that the entire portion may be bent.

As specifically explained above with the examples,
According to the present invention, the crepe paper constituting the main insulation layer is made to protrude to separate the ends of the high-voltage winding and the ends of the low-voltage winding, thereby strengthening the creepage insulation between the two windings. Ru. Furthermore, as the creeping insulation was strengthened, the insulation structure provided at the ends of both windings could be made thinner, and at least the protruding portion of the crepe paper located within the window of the iron core was folded.
A more compact transformer winding than before can be obtained. Also, since crepe paper is used, which is easy to fold, it is easy to manufacture.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram schematically showing a wound core transformer equipped with a transformer winding according to the prior art, and FIG. 2 is a cross-sectional view extracting and showing a part of the transformer winding according to the prior art. Fig. 3 is a sectional view showing the main part of the embodiment of the present invention, Fig. 4 is a sectional view specifically showing the folded portion of the kraft paper, and Fig. 5 is a sectional view showing the main part of the embodiment of the present invention. FIG. 2 is a schematic diagram showing a wound core transformer. In the drawings, 1 is an iron core, 5 is a low voltage winding, 6 and 9 are main insulating layers, 7 is a high voltage winding, 8a and 8b are interlayer insulation papers, 9a is kraft paper, and 9b is crepe paper.

Claims (1)

[Scope of utility model registration request] In a transformer winding in which a main insulating layer is interposed between a low-voltage winding and a high-voltage winding that are integrally wound and formed with interlayer insulating paper, the main insulating layer has a width equal to that of the interlayer insulating paper. It is formed of a wider crepe paper that is easy to bend and is provided so that both ends protrude, and kraft paper that is overlapped with the crepe paper and has a width equal to that of the interlayer insulating paper. A transformer winding characterized in that a portion located within the window is bent toward the high voltage winding side.