JPH09330826A - Transformer winding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To sufficiently fix an outer winding layer to an inner winding layer by providing a prepreg tape layer between the inner and outer winding layers in a state where the tape layer is brought into contact with the first layer of the outer winding layer. SOLUTION: An outer winding layer 2 is put on the outer periphery of an inner winding layer 1 formed of a rectangular conductor by using the bolster laminating winding method in which a conductor 3 is wound by positioning the upper-layer conductor 3 in recesses formed of lower-layer conductor 3. Then a main insulating layer 5 and a prepreg tape layer 6 are provided between the winding layers 1 and 2 with the tape layer 6 on the outside. The insulating layer 5 is formed by winding insulating paper and the tape layer 6 is formed by winding a prepreg tape so that the layer 6 can be brought into contact with the first layer 2a of the winding layer 2. The surface of the conductor 3 is insulated by coating the surface with an enamel resin.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transformer winding in which an outer winding layer is superposed on an outer circumference of an inner winding layer.

[0002]

2. Description of the Related Art In a conventional transformer winding, as shown in FIG. 19, each layer of a winding conductor 3 having a round cross section is provided on the outer circumference of an inner winding layer 1 made of a winding layer of a flat conductor that does not collapse. The outer winding layer 2 is formed by layering the adhesive paper 4 on the upper and lower sides of the layer and winding the layer. In this case, usually the inner winding layer 1
Is the low-voltage winding and outer winding layer 2 is the high-voltage winding, but vice versa.

[0003]

However, conventionally, since the adhesive paper 4 is simply interposed between the inner winding layer 1 and the outer winding layer 2, the outer winding layer with respect to the inner winding layer 1 There was a problem that 2 could not be fixed sufficiently.

An object of the present invention is to provide a transformer winding capable of sufficiently fixing the outer winding layer to the inner winding layer.

Another object of the present invention is to provide a transformer winding capable of adequately fixing the outer winding layer to the inner winding layer and ensuring insulation between the inner winding layer and the outer winding layer. To provide.

Another object of the present invention is to provide a transformer winding capable of improving the mechanical force of the outer winding layer.

Another object of the present invention is to provide a transformer winding capable of improving the mechanical force between the inner winding layer and the outer winding layer.

[0008]

DISCLOSURE OF THE INVENTION The present invention is a transformer having a structure in which a high voltage winding and a low voltage winding are arranged so that one of them is an inner winding layer and the other is an outer winding layer. It improves the winding.

In the transformer winding according to claim 1,
A prepreg tape layer is provided between the inner winding layer and the outer winding layer in contact with the first layer of the outer winding layers. Here, the prepreg tape is a tape obtained by impregnating a high-strength fiber material such as glass fiber with a resin to a semi-cured state.

By thus interposing the prepreg tape layer between the inner winding layer and the outer winding layer, the prepreg tape layer is melted with the resin when the transformer winding is heated and dried to form the inner winding layer. The outer winding layer can be securely fixed to the outer winding layer, and the mechanical force between them can be improved. Especially, when the prepreg tape layer is in contact with the first layer of the outer winding layer, the prepreg tape layer is soft at the winding stage, and the winding conductor is bitten by the tension at the time of winding to prevent the occurrence of line deviation. it can. Further, the prepreg tape layer melts the resin during heating and drying of the transformer winding and fixes the winding conductor of the first layer, so that line deviation can be more reliably prevented.

In the transformer winding according to claim 2,
It is characterized in that the outer winding layer is composed of a bale stack winding layer.

The term "bale stacking" means that when a plurality of winding layers which are aligned and wound with a pitch between adjacent turns are laminated to form a multi-layer winding, each turn of the outer winding layer is formed. It means that the winding of each layer is wound with the conductor of (1) positioned between the conductors of two adjacent turns of the inner winding layer.

When the outer winding layer is composed of the bale winding layer in this way, in each layer of the outer winding layer, the winding conductor of the upper layer is positioned in the recess between the winding conductors of the lower layer. Therefore, it is possible to prevent the line deviation of each layer, and it is not necessary to interpose adhesive paper or the like.

In the transformer winding according to claim 3,
It is characterized in that the inner winding layer is formed of a bale winding layer or a flat conductor winding layer.

When the inner winding layer is formed of the bale winding layer or the flat conductor winding layer as described above, it is possible to reliably prevent line deviation of each layer of the inner winding layer.

In the transformer winding according to claim 4,
It is characterized in that a prepreg tape layer, a main insulating layer and a prepreg tape layer are provided between the inner winding layer and the outer winding layer.

When the prepreg tape layer, the main insulating layer and the prepreg tape layer are thus provided between the inner winding layer and the outer winding layer, the inner winding layer and the outer winding layer are formed by these prepreg tape layers. The mechanical force between the inner winding layer and the outer winding layer can be reliably ensured by the main insulating layer.

In the transformer winding according to claim 5,
It is characterized in that the surface of the outer winding layer composed of the bale winding layer is covered with the prepreg tape layer.

By covering the surface of the outer winding layer with the prepreg tape layer as described above, the mechanical force of the outer winding layer can be improved.

In the transformer winding according to claim 6,
It is characterized in that the surface of the inner winding layer formed by the bale winding layer or the winding layer of the rectangular conductor is covered with the prepreg tape layer.

By covering the surface of the inner winding layer formed of the bale winding layer or the winding layer of the rectangular conductor with the prepreg tape layer, the mechanical force of the inner winding layer can be improved.

[0022]

FIG. 1 shows a first example of an embodiment of a transformer winding according to the present invention.

In the transformer winding of this example, the inner winding layer 1 formed of a rectangular conductor winding layer is provided on the outer periphery of the inner winding layer 1, and the upper layer is formed in the recess between the winding conductors 3 of the lower layer. The outer winding layer 2 is provided in a stacked manner in which the winding conductor 3 is positioned and wound in a bale stack.

Particularly, in this example, the main insulating layer 5 and the prepreg tape layer 6 are provided between the inner winding layer 1 and the outer winding layer 2.
Are provided with the prepreg tape layer 6 disposed outside. The main insulating layer 5 is provided by winding an insulating paper. The prepreg tape layer 6 is provided by winding a prepreg tape. First layer 2a of outer winding layer 2
Are provided in contact with the prepreg tape layer 6. The surface of the winding conductor 3 is insulation-coated with an enamel resin.

In such a transformer winding, the outer winding layer 2
Before winding, the insulating paper is wound around the outer circumference of the inner winding layer 1 to form the main insulating layer 5, the prepreg tape is wound around the outer circumference thereof to form the prepreg tape layer 6, and the outer winding is wound around the outer circumference. The first layer 2a of the layer 2 is wound. At this time, the prepreg tape layer 6 is soft, and it is possible to prevent the winding conductor 3 from biting into the prepreg tape layer 6 due to the tension of the first layer 2a when the first layer 2a is wound, thereby preventing the occurrence of line deviation. Further, in the prepreg tape layer 6, since the resin is melted and the winding conductor 3 of the first layer 2a is fixed by the prepreg tape layer 6 when the transformer winding is heated and dried, the line deviation can be prevented more reliably. it can.

Each of the upper layers 2b, 2c ... Of the first layer 2a of the outer winding layer 2 positions the upper layer winding conductor 3 in a recess between the lower layer winding conductors 3. Since the layers are stacked, the layers 2b and 2c on the upper side of the first layer 2a
It is possible to prevent the line deviation of ... and to eliminate the need for interposing adhesive paper or the like.

Further, when the main insulating layer 5 is provided between the inner winding layer 1 and the outer winding layer 2, the insulation between the inner winding layer 1 and the outer winding layer 2 is provided by the main insulating layer 5. Can be reliably performed.

FIG. 2 shows a second example of the embodiment of the transformer winding according to the present invention.

In the transformer winding of this example, the inner winding layer 1 is provided on the outer periphery of a winding cylinder (not shown) with a prepreg tape layer 7 interposed therebetween. Although not shown, the first layer of the inner winding layer 1 is provided in contact with the prepreg tape layer 7. Other configurations are the same as in the first example.

When the prepreg tape layer 7 is thus provided between the winding drum and the inner winding layer 1, the inner winding layer 1 can be reliably fixed to the winding drum by the prepreg tape layer 7. At the same time, it is possible to reliably prevent the occurrence of line deviation in the first layer of the inner winding layer 1.

FIG. 3 shows a third example of the embodiment of the transformer winding according to the present invention.

In the transformer winding of this example, the prepreg tape layer 8, the main insulating layer 5 and the prepreg tape layer 6 are laminated in this order between the inner winding layer 1 and the outer winding layer 2. It is installed. Other configurations are the same as in the first example.

When the prepreg tape layer 8, the main insulating layer 5 and the prepreg tape layer 6 are provided between the inner winding layer 1 and the outer winding layer 2 in this manner, the inner side of the prepreg tape layers 8 and 6 is further improved. The mechanical force between the winding layer 1 and the outer winding layer 2 can be improved, and the main insulating layer 5 ensures the insulation between the inner winding layer 1 and the outer winding layer 2. You can

Also in this example, as in the second example, the prepreg tape layer 7 can be interposed between the winding drum (not shown) and the inner winding layer 1.

FIG. 4 shows a fourth example of the embodiment of the transformer winding according to the present invention.

The transformer winding of this example is characterized in that it has the structure of the third example and the surface of the outer winding layer 2 is covered with the prepreg tape layer 6. Other configurations are similar to those of the third example.

By covering the surface of the outer winding layer 2 with the prepreg tape layer 6 as described above, the mechanical force of the outer winding layer 2 can be improved.

Incidentally, such a structure has the first and second examples.
The same applies to the examples.

FIG. 5 shows a fifth example of the embodiment of the transformer winding according to the present invention.

In the transformer winding of this example, in the structure of the second example, the surface of the inner winding layer 1 is covered with the prepreg tape layer 7, and the surface of the outer winding layer 2 is prepreg tape layer 6.
It is characterized by being covered with. Other configurations are the second
It is similar to the example.

When the surfaces of the inner winding layer 1 and the outer winding layer 2 are thus covered with the prepreg tape layers 7 and 6, respectively,
The mechanical force between the inner winding layer 1 and the outer winding layer 2 can be improved respectively.

FIG. 6 shows a sixth example of the embodiment of the transformer winding according to the present invention.

In the transformer winding of this example, a prepreg tape layer 7 is interposed between a winding cylinder (not shown) and the inner winding layer 1, and the inner winding layer 1 is a lower layer winding having a round cross section. Wire conductor 3
The winding conductors 3 ′ of the upper layer having a circular cross section are positioned and wound in the recesses between the ‘b’ and are wound in a bale stack. An outer winding layer 2 is provided on the outer periphery of the inner winding layer 1 with a prepreg tape layer 8, a main insulating layer 5 and a prepreg tape layer 6 interposed therebetween. The outer winding layer 2 is provided with the winding conductors 3 in a bale winding manner as in the first example.

When the inner winding layer 1 and the outer winding layer 2 are formed in a baggage-wound manner in this way, it is possible to prevent both the line deviation between the inner winding layer 1 and the outer winding layer 2. Further, when the prepreg tape layer 8, the main insulating layer 5, and the prepreg tape layer 6 are provided between the inner winding layer 1 and the outer winding layer 2,
These prepreg tape layers 8 and 6 can improve the mechanical force between the inner winding layer 1 and the outer winding layer 2, and the main insulating layer 5 allows the inner winding layer 1 and the outer winding layer 2 to be separated from each other. Insulation between them can be surely performed.

FIG. 7 shows a seventh example of the embodiment of the transformer winding according to the present invention.

In the transformer winding of the present example, the inner winding layer 1 and the outer winding layer 2 are both formed in a bale stack, and each surface of the inner winding layer 1 and the outer winding layer 2 is formed. Are covered with prepreg tape layers 7 and 6. Inner winding layer 1 covered with prepreg tape layer 7 and prepreg tape layer 6
The main insulating layer 5 is interposed between the outer winding layer 2 and the outer winding layer 2.

When the inner winding layer 1 and the outer winding layer 2 are both formed in a bales-stacked manner in this way, it is possible to prevent line deviation between the inner winding layer 1 and the outer winding layer 2 and to bond them. There is no need for intervention such as paper. Further, by covering the respective surfaces of the inner winding layer 1 and the outer winding layer 2 with the prepreg tape layers 7 and 6, both the mechanical force between the inner winding layer 1 and the outer winding layer 2 is improved. be able to. Further, when a main insulating layer 5 is provided between the inner winding layer 1 and the outer winding layer 2, the main insulating layer 5
Thus, the insulation between the inner winding layer 1 and the outer winding layer 2 can be surely performed.

FIG. 8 shows an eighth embodiment of the transformer winding according to the present invention.

The transformer winding of the present example is different from the structure of the sixth example in that the outer winding layer 2 is formed of a flat conductor winding layer.

FIG. 9 shows a ninth example of the embodiment of the transformer winding according to the present invention.

In the transformer winding of the present embodiment, the outer winding is formed on the outer circumference of the inner winding layer 1 formed of the flat conductor winding layer, with the main insulating layer 5 and the prepreg tape layer 6 interposed. Layer 2
Is provided by layer winding with adhesive papers 4 arranged above and below each layer of the winding conductor 3 having a round cross section. The first layer 2a of the outer winding layer 2 is provided in contact with the prepreg tape layer 6.

By doing so, the first layer 2a of the outer winding layer 2 composed of the layer winding is formed on the prepreg tape layer 6, so that the outer winding layer 2 can be prevented while preventing line deviation.
The first layer 2a can be formed.

FIG. 10 shows a tenth example of the embodiment of the transformer winding according to the present invention.

In the transformer winding of this example, the inner winding layer 1 is provided on the outer periphery of a winding cylinder (not shown) via the prepreg tape layer 7. Although not shown, the first layer of the inner winding layer 1 is provided in contact with the prepreg tape layer 7. Other configurations are similar to those of the ninth example.

When the prepreg tape layer 7 is provided between the winding drum and the inner winding layer 1 as described above, the inner winding layer 1 can be reliably fixed to the winding drum by the prepreg tape layer 7. At the same time, it is possible to reliably prevent the occurrence of line deviation in the first layer of the inner winding layer 1.

FIG. 11 shows an eleventh example of the embodiment of the transformer winding according to the present invention.

The transformer winding of this example has the structure of the tenth example, and a prepreg tape layer 8, a main insulating layer 5 and a prepreg tape layer 6 are provided between the inner winding layer 1 and the outer winding layer 2. However, it is characterized in that the layers are provided in this order. The other configurations are similar to those of the tenth example.

By thus providing the prepreg tape layer 8, the main insulating layer 5 and the prepreg tape layer 6 between the inner winding layer 1 and the outer winding layer 2, the prepreg tape layers 8 and 6 are formed.
By this, the mechanical force between the inner winding layer 1 and the outer winding layer 2 can be improved, and the main insulating layer 5 ensures the insulation between the inner winding layer 1 and the outer winding layer 2. be able to.

FIG. 12 shows a twelfth example of the embodiment of the transformer winding according to the present invention.

The transformer winding of the present example is characterized by the structure of the tenth example, in which the surface of the inner winding layer 1 is covered with the prepreg tape layer 7. Other configurations are the tenth
It is similar to the example.

By covering the surface of the inner winding layer 1 with the prepreg tape layer 7 as described above, the mechanical force of the inner winding layer 1 can be improved.

FIG. 13 shows a thirteenth example of the embodiment of the transformer winding according to the present invention.

In the transformer winding of this example, in the structure of the ninth example, the inner winding layer 1 is layered by arranging the adhesive paper 4 above and below each layer of the winding conductor 3'having a round cross section. The point is that it is provided.

In this way, the first layer 2a of the outer winding layer 2 composed of the layer winding is formed on the prepreg tape layer 6, so that the outer winding layer 2 can be prevented from being displaced.
The first layer 2a can be formed.

FIG. 14 shows a fourteenth example of the embodiment of the transformer winding according to the present invention.

In the transformer winding of this example, the inner winding layer 1 is provided by layer winding with adhesive papers 4 arranged above and below each layer of the winding conductor 3'having a round cross section. The outer winding layer 2 is provided on the outer periphery of the layer 1 via the main insulating layer 5 and the prepreg tape layer 6 in a bale stack. The first layer 2a of the outer winding layer 2 is provided in contact with the prepreg tape layer 6.

Even in such a transformer winding, it is possible to prevent the first layer 2a of the outer winding layer 2 from digging into the outer periphery of the prepreg tape layer 6 to prevent the occurrence of line deviation. Further, since the prepreg tape layer 6 melts the resin during heating and drying of the transformer winding and fixes the winding conductor 3 of the first layer 2a with the prepreg tape layer 6, it is possible to prevent the line deviation more reliably. You can

Further, since the outer winding layer 2 is formed by the bale stacking, it is possible to prevent the line deviation of each layer of the outer winding layer 2 and to eliminate the need for an adhesive paper or the like.

Further, when the main insulating layer 5 is provided between the inner winding layer 1 and the outer winding layer 2, the inner winding layer 1 and the outer winding layer 2 are provided.
It is possible to surely perform insulation between and.

FIG. 15 shows a fifteenth example of the embodiment of the transformer winding according to the present invention.

In the transformer winding of this example, the inner winding layer 1 is provided on the outer periphery of a winding cylinder (not shown) via the prepreg tape layer 7. The first layer 1a of this inner winding layer 1
Are provided in contact with the prepreg tape layer 7. The other structure is similar to that of the fourteenth example.

When the prepreg tape layer 7 is provided between the winding drum and the inner winding layer 1 in this way, the inner winding layer 1 can be reliably fixed to the winding drum by the prepreg tape layer 7. At the same time, it is possible to reliably prevent the occurrence of line deviation in the first layer 1a of the inner winding layer 1.

FIG. 16 shows a sixteenth example of the embodiment of the transformer winding according to the present invention.

In the transformer winding of this example, the prepreg tape layer 8, the main insulating layer 5 and the prepreg tape layer 6 are laminated in this order between the inner winding layer 1 and the outer winding layer 2. It is installed. The other structure is similar to that of the fourteenth example.

By thus providing the prepreg tape layer 8, the main insulating layer 5 and the prepreg tape layer 6 between the inner winding layer 1 and the outer winding layer 2, the prepreg tape layers 8 and 6 are formed.
By this, the mechanical force between the inner winding layer 1 and the outer winding layer 2 can be improved, and the main insulating layer 5 ensures the insulation between the inner winding layer 1 and the outer winding layer 2. be able to.

Also in this example, as in the fifteenth example, the prepreg tape layer 7 can be interposed between the winding drum (not shown) and the inner winding layer 1.

FIG. 17 shows a seventeenth example of the embodiment of the transformer winding according to the present invention.

The transformer winding of this example is characterized by the structure of the fourteenth example in that the surface of the outer winding layer 2 is covered with the prepreg tape layer 6. Other configurations are the 14th
It is similar to the example.

By covering the surface of the outer winding layer 2 with the prepreg tape layer 6 as described above, the mechanical force of the outer winding layer 2 can be improved.

Such a structure can be similarly applied to the structure of the fifteenth example.

FIG. 18 shows an eighteenth example of the embodiment of the transformer winding according to the present invention.

In the transformer winding of the present example, the prepreg tape layer 7 is interposed between the winding drum (not shown) and the inner winding layer 1, and the inner winding layer 1 is wound in a bale by winding the winding conductor 3 '. It is provided in. An outer winding layer 2 is provided on the outer periphery of the inner winding layer 1 with a prepreg tape layer 8, a main insulating layer 5 and a prepreg tape layer 6 interposed therebetween. The outer winding layer 2 is provided by layer winding, with the outer winding layer 2 having adhesive papers 4 arranged above and below each layer of the winding conductor 3 having a round cross section. The first layer 2a of the outer winding layer 2 is provided in contact with the prepreg tape layer 6.

In this way, since the inner winding layer 1 is formed in a bales-stacked winding, it is possible to prevent line deviation between the layers forming the inner winding layer 1 and to eliminate the need for an adhesive paper or the like. . Further, since the first layer 2a of the outer winding layer 2 formed by the layer winding is formed on the prepreg tape layer 6, the first layer 2a of the outer winding layer 2 is formed while preventing line deviation. be able to.

[0084]

In the transformer winding according to the present invention, since the prepreg tape layer is interposed between the inner winding layer and the outer winding layer, this prepreg tape layer is the transformer winding. The resin is melted during the heating and drying, so that the inner winding layer and the outer winding layer can be securely fixed to each other, and the mechanical force between them can be improved. In particular, since the first layer of the outer winding layer is wound in contact with the prepreg tape layer, the prepreg tape layer is soft at the winding stage, and the winding conductor bites due to the tension at the time of winding, resulting in line deviation. Can be prevented. Further, the prepreg tape layer melts the resin during heating and drying of the transformer winding and fixes the winding conductor of the first layer, so that the line deviation can be more reliably prevented.

In the transformer winding according to claim 2,
Since the outer winding layer is composed of the bale-wound layer, there is an advantage that line deviation of each layer can be prevented and no intervening adhesive paper or the like is required.

In the transformer winding according to claim 3,
Since the inner winding layer is formed of a bale stacking layer or a flat conductor winding layer, it is possible to reliably prevent line deviation of each layer of the inner winding layer.

In the transformer winding according to claim 4,
Since the prepreg tape layer, the main insulating layer and the prepreg tape layer are provided between the inner winding layer and the outer winding layer, the machine between the inner winding layer and the outer winding layer is formed by these prepreg tape layers. The force can be improved and the main insulating layer can surely provide insulation between the inner winding layer and the outer winding layer.

In the transformer winding according to claim 5,
Since the surface of the outer winding layer composed of the bale winding layer is covered with the prepreg tape layer, the mechanical force of the outer winding layer can be improved.

In the transformer winding according to claim 6,
Since the surface of the inner winding layer formed of the bale winding layer or the winding layer of the rectangular conductor is covered with the prepreg tape layer, the mechanical force of the inner winding layer can be improved.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of an upper half part showing a first example of an embodiment of a transformer winding according to the present invention.

FIG. 2 is a vertical sectional view of an upper half part showing a second example of the embodiment of the transformer winding according to the present invention.

FIG. 3 is a vertical cross-sectional view of an upper half part showing a third example of the embodiment of the transformer winding according to the present invention.

FIG. 4 is a vertical cross-sectional view of an upper half part showing a fourth example of the embodiment of the transformer winding according to the present invention.

FIG. 5 is a vertical sectional view of an upper half part showing a fifth example of the embodiment of the transformer winding according to the present invention.

FIG. 6 is a vertical sectional view of an upper half part showing a sixth example of the embodiment of the transformer winding according to the present invention.

FIG. 7 is a vertical sectional view of an upper half part showing a seventh example of the embodiment of the transformer winding according to the present invention.

FIG. 8 is a vertical cross-sectional view of an upper half part showing an eighth example of the embodiment of the transformer winding according to the present invention.

FIG. 9 is a vertical sectional view of an upper half part showing a ninth example of the embodiment of the transformer winding according to the present invention.

FIG. 10 is a vertical sectional view of an upper half part showing a tenth example of an embodiment of a transformer winding according to the present invention.

FIG. 11 is a vertical cross-sectional view of an upper half part showing an eleventh example of the embodiment of the transformer winding according to the present invention.

FIG. 12 is a vertical sectional view of an upper half part showing a twelfth example of the embodiment of the transformer winding according to the present invention.

FIG. 13 is a vertical cross-sectional view of an upper half part showing a thirteenth example of the embodiment of the transformer winding according to the present invention.

FIG. 14 is a vertical sectional view of an upper half part showing a fourteenth example of the embodiment of the transformer winding according to the present invention.

FIG. 15 is a vertical cross-sectional view of an upper half part showing a fifteenth example of the embodiment of the transformer winding according to the present invention.

FIG. 16 is a vertical cross-sectional view of an upper half part showing a sixteenth example of the embodiment of the transformer winding according to the present invention.

FIG. 17 is a vertical sectional view of an upper half part showing a seventeenth example of the embodiment of the transformer winding according to the present invention.

FIG. 18 is a vertical sectional view of an upper half part showing an eighteenth example of the embodiment of the transformer winding according to the present invention.

FIG. 19 is a vertical cross-sectional view of the upper half of a conventional transformer winding.

[Explanation of symbols]

 1 Inner Winding Layer 1a First Layer 1b, 1c ... Upper Layers 2 Outer Winding Layer 2a First Layer 2b, 2c ... Upper Layers 3, 3 ′ Winding Conductor 4 Adhesive Paper 5 Main Insulating Layer 6, 7, 8 prepreg tape layer

Claims (6)

[Claims] 1. A transformer winding in which a high-voltage winding and a low-voltage winding are stacked so that one of them is an inner winding layer and the other is an outer winding layer. A transformer winding, wherein a prepreg tape layer is provided between the outer winding layer and the outer winding layer in contact with a first layer of the outer winding layer. 2. The transformer winding according to claim 1, wherein the outer winding layer is formed of a bale stacking layer. 3. The transformer winding according to claim 1, wherein the inner winding layer is formed of a bale winding layer or a flat conductor winding layer. 4. The prepreg tape layer, the main insulating layer, and the prepreg tape layer are provided between the inner winding layer and the outer winding layer, according to claim 1, 2, or 3. The listed transformer winding. 5. The transformer winding according to claim 2, 3 or 4, wherein the surface of the outer winding layer composed of a bale-wound layer is covered with a prepreg tape layer. 6. A prepreg tape layer covering the surface of the inner winding layer formed of a bale winding layer or a flat conductor winding layer, according to claim 3, 4 or 5. The listed transformer winding.