JPH0625934Y2 - High voltage winding - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial Field This invention relates to high voltage windings.

(Prior Art) For example, in an electromagnetic induction device such as a transformer shown in FIG. 5, when a low voltage winding 2 is wound around an iron core 1 and a high voltage winding 3 is concentrically wound around the iron core 1, an electric wire It is already well known that the high voltage winding 3 is constructed by stacking a plurality of block windings 4 due to the manufacturing restrictions when a round wire is used as. An insulating member 5 insulates the block windings 4 from each other.

FIG. 4 shows a cross-sectional view of a conventional block winding 4, in which an electric wire 8 is wound in multiple layers on the outer circumference of an inner insulating cylinder 6 via a plurality of interlayer papers 7 and an outer insulating cylinder 9 is provided. The insulating paper 10 is wound around the entire circumference.

The interlaminar paper 7 is used by bending the end portion thereof in order to prevent the electric wire 8 from falling off. Further, the insulating paper 10 has its both ends lengthened by a predetermined length, and after the winding work, the ends are bent outward or inward so as to cover the inner peripheral portion and the outer peripheral portion of the winding, respectively.

In each block winding 4, the electric field concentrates on the inner and outer peripheral corners. Therefore, since this portion becomes a weak point in insulation, the insulating cylinders 6 and 9 are arranged inside and outside as shown in the figure.

By the way, in such a structure, the heat generated inside the winding is transmitted along the radial direction inside the winding, and the insulating oil existing around the inner peripheral surface and the outer peripheral surface of the winding is Transmitted to the cooling medium. However, since this type of high-voltage winding has a large number of turns, the number of winding layers may be several tens.

Therefore, in the above-described conventional winding, the temperature of the central portion of the winding increases considerably. To avoid this, conventionally, the cross-sectional area of the winding is increased to reduce the current density. However, this entails an increase in the size of the winding and there is a limit to the reduction in temperature rise.

(Problems to be Solved by the Invention) The purpose of the present invention is to make it possible to reduce the temperature rise of the winding without lowering the insulation performance and increasing the size of the winding structure.

(Means for Solving Problems) This invention is configured by dividing a block winding of a high-voltage winding along its radial direction, and dividing each of the inside winding and the outside division winding into each of them. Insulation cylinders that insulate the corners are provided, and the entire circumference of both split windings is wrapped with insulating paper to insulate the split windings. A duct extending along the block winding is further provided, and a duct communicating with the duct is provided in the insulating member between the block windings so as to penetrate in the radial direction of the winding.

(Embodiment) An embodiment of the present invention will be described with reference to FIGS. In addition, the same reference numerals as those in FIG. 4 indicate the same or corresponding portions. The configuration shown in FIG. 1 shows an example in which one block winding is constituted by three divided windings.

The inner divided winding 11 has multiple layers of the electric wire 8 wound around the outer circumference of the inner insulating cylinder 6 with the interlayer paper 7 interposed therebetween.
It is constructed by winding 0. Similarly, the outer split winding 1
2 is provided with an outer insulating tube 9 and an electric wire 8 inside thereof.
The electric wire 8 is wound in multiple layers via the interlayer paper 7, and the periphery thereof is wound with the insulating paper 10.

An intermediate split winding 13 is located between the split windings 11 and 12. The split winding 13 is also formed by winding the electric wire 8 in multiple layers via interlayer paper, but the cooling medium flows between the inside and the outside thereof, that is, the outside of the split winding 11 and the inside of the split winding 12. The duct 14 is formed to extend along the axial direction of the winding.

For forming the duct 14, for example, as shown in FIG. 2, it is preferable to use a spacer 17 configured by fixing a large number of the piece materials 16 on the surface of a mount 15. The spacer 17 is installed so as to be wound around the outside of the divided winding 11 and the inside of the divided winding 12. At this time, the space between the adjacent strips 16 is used as the duct 14.

In the insulating member 5 between the block windings 4, a duct 18 communicating with the duct 14 is provided so as to penetrate in the radial direction of the winding. For forming the duct 18, it is preferable to use, for example, an annular insulating plate 19 partially shown in FIG. 3 on the front and back surfaces of which a plurality of pieces 20 are fixed at appropriate intervals. The space between the adjacent pieces 19 is used as the duct 18.

In the above configuration, the electric field is concentrated on the inner and outer corners of the winding as in the conventional case, but as shown in the figure, the surroundings of both split windings 11 and 12 are covered with insulating paper. By insulating with 10, the corners are reliably insulated. That is, the insulation performance is equivalent to that of the conventional configuration.

On the other hand, the duct 14 is provided between the winding layers, and the block winding 4 is also provided.
Since the duct 18 is formed between them, a cooling medium such as surrounding insulating oil flows back in the winding through each duct as shown by an arrow. This ensures that the temperature rise due to the heat generated inside the winding due to the circulation of the cooling medium can be avoided.

Such a reduction in temperature rise enables a design in which the current density of the winding is increased, and also leads to a reduction in winding material and a compact device.

In the configuration shown in the figure, two ducts 14 are provided, but it is needless to say that more ducts may be formed within the split winding 3.

(Effect of the Invention) As described in detail above, according to the present invention, the temperature rise of the winding can be greatly reduced without impairing the insulation performance of the high-voltage winding, and the winding material can be reduced. This has the effect of enabling downsizing.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention, FIG. 2 is a perspective view of a spacer used to form a duct, FIG. 3 is a partial perspective view of the same insulating member, and FIG. 4 is a conventional example. A sectional view and FIG. 5 are partial sectional views of the transformer. 4 ... Block winding, 5 ... Insulating member, 6, 9 ... Insulating cylinder, 8 ... Electric wire, 10 ... Insulating paper, 11-12 ... Split winding, 14, 18 ... Duct,

Claims (1)

[Scope of utility model registration request] 1. A high-voltage winding comprising a plurality of block windings laminated in multiple stages with an insulating member interposed between the block windings, the block windings being divided along the radial direction of the block windings. The wire and the outer split winding are provided with insulating cylinders that insulate the respective corners, and the entire circumference of both split windings is wrapped with insulating paper to insulate them, and is located between the split windings. The divided winding is provided with a duct along the axial direction of the winding, and the insulating member between the block windings is provided with a duct communicating with the duct in a radial direction of the winding. High voltage winding.