JPH04103113A - Stationary induction electric machine - Google Patents

Abstract

PURPOSE:To enhance them insulation reliability and the mechanical strength of a winding, and to make it possible to reduce the vibration and the noise by a method wherein a rail or a spacer is constituted by an elastic insulator. CONSTITUTION:A duct rail 8, consisting of an elastic material, is fixed along axial direction to the outer circumferential side of a basic insulated tube 1 arranged around a core, and a wiring is constituted by winding a conductor 4 coated with an insulator 3. At this time, a winding is constituted by inserting spacers 9, a part or whole of which consisting of an elastic material, between each wound layer in such a manner that it is groove-engaged to the duct rail 8. The conductor 4 is tightened by the rail 8, and it is closely fixed to the rail 8 part consisting of an elastic material. Also, in order to maintain a gap between the sections of the conductor, the spacers 9, partially arranged in the circumferential direction of the winding, are composed of an elastic material. As a result, the conductor 4 is completely attached the elastic spacer part 8 by tightening the winding from vertical direction. As a result, no wedge-like gap is formed between the conductor and the rail or the spacers.

Description

[Detailed Description of the Invention] [Purpose of the Invention (Industrial Application Field) The present invention relates to static induction electric equipment such as transformers, and in particular to a method for improving the dielectric strength and mechanical strength of windings and reducing noise. Concerning stationary induction electrical equipment.

(Conventional technology) When applying static induction electrical equipment to higher voltage/larger capacity equipment, the biggest technical problem lies in how to provide equipment with high dielectric strength and improve mechanical strength. There is.

An example of a conventional stationary induction electric device will be described below with reference to FIG.

As shown in FIG. 5, a duct rail 2 fixed along the axial direction on the outer peripheral side of a basic insulation cylinder 1 arranged around the iron core is covered with an insulator 3 made of insulating paper, an insulating film, or an insulating coating. A winding 5 is formed by winding the conductor 4. A spacer 6 is inserted between each of the winding layers of the winding 5, the left end of which is engaged with the duct rail 2 in a groove. The conductor 4 is wound from the outside to the inside or from the inside to the outside to form sections 7, and the gaps between the sections 7 are maintained by spacers 6 equally spaced in the circumferential direction. It is configured. The windings are housed in a tank with an insulating medium such as oil or SF6 gas.

As shown in the enlarged view of FIG. A wedge-shaped gap G in which the gap G and the gap length continuously change are generated. An insulating medium such as oil or insulating gas exists in such a gap G, but generally the dielectric constant of the insulating medium is the dielectric constant of the solid insulator of the rail 2, the spacer 6, or the insulator 3 around the conductor. Since the electric field is small compared to It was necessary to provide large insulation distances between the parts, which led to the equipment becoming larger. Furthermore, the insulator shrinks due to drying of the insulator or withering during long-term operation, causing looseness in the windings, resulting in increased vibration and noise. Moreover, it also caused a decrease in mechanical strength such as tightening force and short-circuit mechanical force.

(Problems to be Solved by the Invention) The present invention has been made to solve the problems of the prior art, and its purpose is to improve the insulation reliability of the winding, thereby reducing the insulation distance to the minimum possible, thereby reducing the entire winding. The object of the present invention is to provide a low-noise stationary induction electric device that has reduced the dimensions of the coil, increased the mechanical strength of the winding, and also absorbed vibrations during energization.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, the present invention provides a static induction electric device in which a conductor is wound around an iron core to form a winding. A duct rail extending in the axial direction is provided on the outer circumferential side, and a conductor is wound around the rail through a spacer that engages with the groove to form a winding, and at least either the rail or the spacer has all or part of it elastic. It is characterized by being made of an insulating material.

(Function) With this configuration, there is no wedge-shaped gap between the conductor and the rail or spacer, which increases the insulation reliability of the winding and absorbs the vibration of the winding, increasing its mechanical strength. becomes larger.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings. Note that the same parts as those of the conventional example already explained will be described with the same reference numerals.

FIG. 1 is an enlarged sectional view of a main part of an embodiment of the present invention.

In the figure, a duct rail 8 made of an elastic body extends in the axial direction on the outer peripheral side of the basic insulation cylinder 1 arranged around the iron core.
is fixed, and a conductor 4 covered with an insulator 3 is wound to form a winding. At this time, between each winding layer, a spacer 9 which is engaged in a groove with the duct rail 8 and is partially or entirely made of an elastic body is inserted to form a winding.

The conductor 4 is wound around the rail 8 from the inside to the outside or from the outside to the inside with a firm tightening force.

Further, the spacers 9 are arranged partially in the circumferential direction to maintain gaps between the sections, and are tightened from above and below to prevent rattling or displacement of the windings.

In the stationary induction electric device of this embodiment configured in this way, the conductor 4 is fastened to the rail 8 and is in close contact with the portion of the rail 8 made of an elastic body. In addition, spacers 9, which are partially arranged in the circumferential direction of the windings in order to maintain gaps between sections of the conductor, are also made of elastic material, so by tightening the windings from above and below, the conductor 4 becomes elastic. It completely adheres to the spacer 8 portion. Therefore, since the conductor 4 is completely in close contact with the rail 8 and spacer 9 without any wedge-shaped minute gaps with the rail 8 or spacer 9, when it is filled with an insulating medium such as oil or SF6 gas, the insulation Since no wedge-shaped gaps are formed, which would be a weak point, the electric field does not concentrate around the conductor, greatly improving insulation reliability.

In addition, since the conductor is compressed by the radial force of wrapping it around the rail or the axial force of tightening the winding in the vertical direction, it is compressed into the rail or spacer made of an elastic material, so it is necessary to provide insulation for the winding drying process and long-term operation. Even when the winding shrinks or withers, the winding does not wobble. Therefore, the mechanical strength is improved without reducing the winding tightening strength. In addition, since it also absorbs vibrations when energized, it has the effect of reducing vibrations and, by extension, noise.

Furthermore, in this embodiment, it goes without saying that either the rail or the spacer may be made of an elastic insulator.

FIG. 2 is an enlarged sectional view of a main part of another embodiment of the present invention.

As shown in Fig. 2, by arranging the conductor to be wound around the insulator 10 made of an elastic material along the outside of the rail 2, the conductor is tightly attached to the insulator made of the elastic material outside the rail. The insulation reliability is high because the rails are wound around the rails, and the rails can be made of insulators with excellent mechanical strength, whether elastic or inelastic, so static induction electrical equipment with excellent mechanical strength can be used. can get.

As shown in FIG. 3, the spacer may be formed by laminating an insulating material 12 made of an elastic material on one or both sides of a non-elastic insulating material 11 made of a conventional presspod or the like. In addition, as shown in FIG.
It may be covered with.

With this configuration, the conductor and the spacer are in close contact with each other without any small gaps, and not only can the same effect as the above embodiment be obtained, but also the part that requires particularly mechanical strength can be made of a strong inelastic material. Since mechanical strength is ensured by using the insulator, the mechanical strength of the winding wire is improved.

Furthermore, a spacer made of an elastic insulator may be used for the inner metal of the winding. For example, only the spacer near the end of the line where the potential is high is made of an elastic insulator, and the rest is made of inelastic material. An insulator made of may also be used. In particular, when the center of the winding is the line end, high insulation reliability can be achieved by using an insulating spacer that uses some or all of the elastic material for the spacer near the line end, and the winding temperature High heat-resistant materials, whether elastic or inelastic, can be used in the upper part of the winding, where the electrical and
A stationary induction electrical device with excellent thermal and mechanical properties can be obtained.

In addition, insulators with elasticity include elastic insulators such as rubber,
Alternatively, an insulator made of a thermoplastic rubber elastic body such as an elastomer may be used.

[Effects of the Invention] As explained above, according to the present invention, since the rail or spacer is made of an elastic insulator, the conductor is closely attached to the rail or spacer, and the insulation reliability of the winding is high. At the same time, it is possible to provide static induction electrical equipment with increased mechanical strength and reduced vibration and noise.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a main part of an embodiment of the present invention, FIG. 2 is a sectional view of a main part of another embodiment of the present invention, and FIGS. 3 and 4 are cross sections of a spacer according to the present invention. 5 is a cross-sectional view of a winding of a conventional static induction electric device, and FIG. 6 is an enlarged cross-sectional view of a main part of the winding shown in FIG. 5...Winding 6...Spacer 7...
Section 8...Duct rail 9 made of elastic material...Spacer 10.12.13...Elastic material insulator 11...Inelastic material insulator Agent Patent attorney (8733) Yoshiaki Inomata ( (1 other person) 1...Basic insulation cylinder 2...Rail 3...Insulator 4...Conductor number! Figure Figure Figure Figure

Claims (1)

[Claims] In stationary induction electric equipment where a conductor is wound around an iron core to form a winding, a duct rail is provided on the outer circumference of the basic insulating tube and extends in the axial direction, and the conductor is wound through a spacer that engages with the groove. 1. A stationary induction electric device, characterized in that the wire is turned to form a winding, and at least one of the rail and the spacer is entirely or partially made of an elastic insulator.