JPS6342501Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to multiple cylindrical windings with improved end reinforcement insulation.

[Technical background of the invention and its problems]

In recent years, multiple cylindrical windings have been increasingly used in windings ranging from small capacity to relatively large capacity transformers. Multiple cylindrical windings are constructed by arranging cylindrical windings in which conductive wire is wound into a cylindrical shape in multiple layers in the radial direction, and end reinforcing insulators are inserted into both axial ends of each cylindrical winding to strengthen the electric field. We are trying to reduce concentration and reduce insulation dimensions.

That is, as shown in FIG. 1, a cylindrical winding 2 is constructed by winding a conductor 2a in a cylindrical shape on an insulating tube 1,
The cylindrical windings 2 are arranged in multiple layers in the radial direction via a cooling duct 3, and end reinforcing insulators 4 are placed over several turns of the conductor 2a at both ends of each cylindrical winding 2 in the axial direction. . Note that the cooling duct 3 is formed by inserting duct pieces at intervals in the circumferential direction. Further, an end filler 5 is provided on the outer side of the end reinforcing insulator 4 in the axial direction. End reinforcement insulator 4
is inserted along the circumferential direction of the cylindrical winding 2, and the outer circumferential side thereof is longer in the circumferential direction than the inner circumferential side, so at least the outer circumferential side needs to have elasticity. Further, when winding the wire, the end reinforcing insulator 4 is placed with the opening example opened, and the conductor 2a is
Since the wire is wound and then returned to a U-shape, the outer periphery must have elasticity in terms of the winding work.

Therefore, this edge reinforcing insulator 4 is made by stacking multiple sheets of stretchable crepe paper and bonding them together under pressure with an adhesive that does not impair the stretchability of the crepe paper to form a U-shape. I am using it.

However, in this case, the end reinforcing insulator 4 also has elasticity on the inner circumferential side, so if there is a cooling duct 3 inside the cylindrical winding 2 as shown in FIG. At the portions where they do not touch, the inner circumferential side of the end reinforcing insulator 4 swells and enters the cooling duct 3, which significantly obstructs the flow of insulating oil rising inside the cooling duct 3 and deteriorates the cooling effect.

Further, when winding the wire, the opening side of the end reinforcing insulator 4 must be opened and the conductor 2a must be wound, resulting in poor workability.

Furthermore, since the end reinforcing insulator 4 is bent into a U-shape, it must be manufactured each time according to the thickness of the conductor 2a, and even if it were to be kept in stock, there would be many types, making it uneconomical. There were some shortcomings.

[Purpose of invention]

This invention was made to eliminate the above-mentioned drawbacks, and does not impair the cooling effect of insulating oil.
Another object of the present invention is to provide a multi-layered cylindrical winding provided with an end reinforcing insulator that has good winding workability and is economical.

[Summary of the idea]

In order to achieve this purpose, the present invention includes an end reinforcing insulator that covers both axial ends of the cylindrical winding.
An inner peripheral insulator that is located on the inner circumference side of the cylindrical winding and has a fitting part that protrudes radially outward; and a fitting part that is located on the outer circumference of the cylindrical winding and protrudes radially inward. The fitting portions of the inner and outer insulators are fitted to each other on the outside of the end of the cylindrical winding, and each insulator has an axial portion made of crepe paper and hard. It is characterized in that it is made of composite insulating paper, and the fitting part is made only of crepe paper.

[Example of idea]

An embodiment of the present invention will be described below with reference to the drawings. In FIG. 2, cylindrical windings 2 in which a conductor 2a is wound in a cylindrical shape are arranged in multiple layers in the radial direction on an insulating cylinder 1 via a cooling duct 3, and both axial ends of each cylindrical winding 2 ( In the figure, only the upper end is shown) is covered with an end reinforcing insulator consisting of inner and outer insulators 6 and 7 over several turns of the conductor 2a. Insulator 6 located on the inner periphery of this end reinforcement insulator
As shown in FIG. 3, it has an axially extending portion 6a and a fitting portion 6b protruding radially outward from one end of the axial portion 6a, and is formed in an F-shaped cross section and is located on the outer periphery. The insulator 7 is formed to have an inverted F-shape in cross section and has a portion 7a extending in the axial direction and a fitting portion 7b protruding radially inward. In addition, each of the insulators 6 and 7 has an axial portion 6a and 7a formed of a composite material in which a relatively hard insulating paper 9 such as pressboard or parchment paper is interposed between a plurality of stacked crepe papers 8, In addition, the fitting parts 6b and 7b are formed by stacking multiple sheets of crepe paper 8.
They are made of chisel and are bonded together under pressure so that the overall thickness is approximately uniform. In this case, the length of the hard insulating paper 9 is the axial portion 6a, 7a.
, and the upper end (or lower end) is not located at the bending part (corner part) from the axial parts 6a, 7a to the fitting parts 6b, 7b, so that the crepe paper 8 is not damaged by bending. Make it. Further, the axial portions 6a and 7a where the hard insulating paper 9 is interposed are pressed and bonded with a particularly large pressure to increase rigidity. Note that the pressure bonding of the plurality of sheets of crepe paper 8 and the like is performed using an adhesive that does not impair the elasticity of the crepe paper 8.

The inner and outer insulators 6 and 7 having such a configuration are arranged on the inner and outer peripheries of the ends of the cylindrical winding 2, and the fitting portions 6b and 7b are fitted together to form the cylindrical winding 2. An end reinforcing insulator is formed to cover the end of the cylindrical wire, and an end filling 5 is provided on the axially outer side of the end reinforcing insulator to form a multiple cylindrical winding.

In this way, since the axial portions 6a and 7a of the end reinforcing insulator have high rigidity, bulging deformation does not occur even in the portions that do not contact the duct piece (not shown), so that there is no possibility of the end reinforcing insulator getting into the cooling duct 3. . Therefore, the end reinforcing insulator does not obstruct the flow of the insulating oil rising inside the cooling duct 3, and the cooling effect of the insulating oil is not impaired. In addition, since the hard insulating paper 9 is interposed only in the axial parts 6a and 7a, the crepe paper 9 that is stacked on top of each other
by bending the axial portions 6a, 7a and the fitting portion 6.
b, 7b, there is no damage caused by tearing at the bent portions, and since the inner and outer insulators 6, 7 fit the fitting portions 6a, 7a into each other, the cylindrical The insulation performance of the 2nd end of the winding is not impaired. Furthermore, since the end reinforcing insulator is divided into two insulators 6 and 7 and the fitting parts 6b and 7b are fitted together,
Even if the thickness of the conductor 2a changes, it can be used in common within the range where the fitting parts 6b and 7b fit,
Economical. On the other hand, during winding work, the inner circumferential insulator 6 is placed as the end reinforcement insulator, and the conductor 2 is placed on top of the inner insulator 6.
After winding the cylindrical wire 2 to form the cylindrical winding 2, the outer peripheral insulator 7 is placed and the fitting portions 6b, 7 of the insulators 6, 7 are formed.
Since it is only necessary to fit the parts b into each other, the work is more efficient than the conventional work in which the conductor is wound while keeping the open end of the end reinforcing insulator wide open, and then returned to the U-shape. can be done.

Although the above embodiment describes the case where the hard insulating paper 9 is interposed in the crepe paper 8, the same effect can be obtained even if it is provided only on the inner circumference side or the outer circumference side of the crepe paper 8.

[Effect of idea]

As explained above, according to the present invention, the end reinforcing insulator is composed of an inner circumferential insulator and an outer circumferential insulator having an axial portion and a fitting portion, and the axial portion of each insulator is made of crepe paper. Since it is formed by combining it with hard insulating paper and the fitting part is made only of crepe paper, it prevents the end reinforcing insulator from bulging and deforming and prevents the cooling effect of the insulating oil from deteriorating. It is possible to provide multiple cylindrical windings that improve workability and can be constructed economically.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing the upper part of a conventional multiple cylindrical winding, FIG. 2 is a sectional view showing the upper part of a multiple cylindrical winding according to an embodiment of the present invention, and FIG. 3 is a sectional view showing the upper part of a multiple cylindrical winding according to an embodiment of the present invention. FIG. 2 is a perspective view, partially in section, of an end reinforcing insulator used for the wire. 2... Cylindrical winding, 2a... Conductor, 3... Cooling duct,
5... End stuffing, 6... Inner periphery insulator, 6a... Axial portion, 6b... Fitting portion, 7... Outer periphery insulating material, 7a... Axial portion, 7b... Fitting portion, 8... Crepe paper, 9... hard insulating paper.

Claims (1)

[Scope of utility model registration request] In a structure in which cylindrical windings are arranged in multiple layers in the radial direction and end reinforcing insulators are placed on both ends of each cylindrical winding in the axial direction, the end reinforcing insulators are located on the inner peripheral side of the cylindrical windings. , an inner circumferential insulator having a fitting portion protruding radially outward, and an outer circumferential insulating member located on the outer circumferential side of the cylindrical winding and having a fitting portion protruding radially inward. The fitting portions of the inner and outer insulators are configured by fitting each other on the outside of the end of the cylindrical winding, and the inner and outer insulators have an axial portion made of crepe paper and hard insulating paper. A multi-layer cylindrical winding wire characterized in that it is formed by combining the above, and the fitting part is formed only from crepe paper.