JP2014007304A - Stationary induction electric apparatus - Google Patents

Abstract

To provide a static induction electric device capable of suppressing the generation of a high electric field around a folded flow plate and enabling the cooling design of the winding without being limited by the location of the folded flow plate.
In a static induction electrical apparatus according to an embodiment, an inner insulating cylinder is arranged so as to surround an iron core leg, and an outer insulating cylinder is arranged concentrically and outside the inner insulating cylinder. A disk winding is disposed between the inner insulating cylinder and the outer insulating cylinder, and is laminated in the axial direction. Horizontal spacers are disposed between the stacks of the disk windings to form a horizontal duct. Vertical spacers are arranged between the disk winding and the inner insulating cylinder and between the disk winding and the outer insulating cylinder to form a vertical duct. Furthermore, a folding plate is disposed between the stacks of the disk windings to form a folding zone having a plurality of disc windings. A gap is formed alternately in the axial direction of the disk winding between one end of the folded plate in the radial direction and the inner insulating tube or the outer insulating tube, and the other in the radial direction of the folded plate The end has a curvature.
[Selection] Figure 1

Description

  Embodiments described herein relate generally to a static induction electrical device.

  As a general structure of a static induction electrical device, an inner insulating cylinder is disposed so as to surround an iron core leg, and an outer insulating cylinder is disposed outside the inner insulating cylinder. A disk winding is laminated in the axial direction between the inner insulating cylinder and the outer insulating cylinder via a horizontal spacer, and a horizontal duct is formed by the horizontal spacer.

  Vertical spacers are arranged along the insulating cylinder on the inner side and the outer side in the radial direction of the disk winding to form a vertical duct. Folded flow plates are installed in places between the stacks of the disk windings, and a folded flow region having a plurality of disk windings is formed between the folded flow plates. Here, gaps are alternately formed in the axial direction between one end portion in the radial direction of the folded flow plate and the insulating cylinder so that the insulating cooling medium flows efficiently and uniformly through the winding portion. Configured.

  However, a minute gap may be generated between the end of the folded flow plate on the opposite side in the radial direction from the side where the gap is formed and the insulating cylinder due to a dimensional error in manufacturing.

  In such a case, it is conceivable that a high electric field is generated in the minute gap portion, resulting in a weak point in insulation. In such a case, since the place which can arrange | position a folded flow board is restrict | limited, the freedom degree of the cooling design of a coil | winding will be impaired.

JP-A-9-199345

  The problem to be solved by the present invention is to provide a static induction electrical device that suppresses the generation of a high electric field around the folded flow plate and enables the cooling design of the winding without being limited by the location of the folded flow plate. It is to be.

  In the static induction electrical device of the embodiment, the inner insulating cylinder is disposed so as to surround the iron core leg, and the outer insulating cylinder is disposed concentrically and outside the inner insulating cylinder. A disk winding is disposed between the inner insulating cylinder and the outer insulating cylinder, and is laminated in the axial direction. Horizontal spacers are arranged between the stacks of the disk windings to form a horizontal duct. Vertical spacers are arranged between the disk winding and the inner insulating cylinder and between the disk winding and the outer insulating cylinder to form a vertical duct. Further, a folded flow plate is disposed between the stacks of the disk windings to form a folded flow region having a plurality of the disk windings. A gap is formed alternately in the axial direction of the disk winding between one end portion in the radial direction of the folded flow plate and the inner insulating tube or the outer insulating tube. The other end in the radial direction has a curvature.

The longitudinal cross-sectional view of the static induction electric equipment of embodiment. The fragmentary perspective view of the static induction electric equipment of an embodiment. The longitudinal cross-sectional view which shows the case where a micro gap | interval arises between the folding plate edge part and an insulation cylinder in the static induction electric equipment of embodiment. An explanatory view showing an analysis result when a 1 mm minute gap is provided between a folded plate end and an insulating tube in a folded plate having a horizontal folded plate and a curvature. Explanatory drawing which shows the relaxation effect when changing the curvature radius of a folding plate. The longitudinal cross-sectional view which shows the case where a micro gap | interval arises between a folding plate edge part and an insulation cylinder in the static induction electric apparatus which has a horizontal folding plate.

  Hereinafter, embodiments will be described with reference to the drawings.

  FIG. 1 is a longitudinal sectional view of a static induction electrical device of the embodiment, and FIG. 2 is a partial perspective view of the static induction electrical device of the embodiment.

  The static induction electrical device of this embodiment includes an iron core leg 1, an inner insulating tube 2, an outer insulating tube 3, a disk winding 4, a horizontal spacer 5, a vertical spacer 6, and a folded flow plate 7 having a curvature at one end. Is provided.

  As shown in FIGS. 1 and 2, an inner insulating tube 2 is disposed so as to surround the iron core leg 1, and an outer insulating tube 3 is disposed concentrically outside the inner insulating tube 2. Between the inner insulating cylinder 2 and the outer insulating cylinder 3, a disk winding 4 in which a wire is wound in a disk shape is disposed. The disk windings 4 are laminated in the axial direction via horizontal spacers 5, and a horizontal duct 8 is formed by the horizontal spacers 5.

  Further, on the inner side and the outer side in the radial direction of the disk winding 4, vertical spacers 6 are arranged along the insulating cylinders 2 and 3, and a vertical duct 9 is formed.

  Disc-shaped folded flow plates 7 are installed in places between the laminated layers of the disk windings 4, and a folded flow area 10 having a plurality of disk windings 4 is formed between the folded flow plates 7. Examples of the material of the folded flow plate include a press board, glass fiber reinforced plastic (FRP), and an E-type insulating material defined by JIS standards.

  Between the one end portion in the radial direction of the folded flow plate 7 and the insulating cylinders 2 and 3, gaps 11 are alternately formed in the axial direction, and the other end portion has a curvature, and the inner insulating cylinder 2 or Contact the outer insulating cylinder 3.

  In the static induction electrical apparatus according to the first embodiment, by providing a curvature at the tip of the folding plate 7, the folding plate 7 on the side having this curvature is caused by a dimensional error in manufacturing as shown in FIG. The generation of an excessively high electric field can be suppressed even when a minute gap 12 is generated between the end of the first and the insulating cylinders 2 and 3.

  In order to confirm this, a model simulating the case where a 1 mm minute gap 103 is formed between the end of the horizontal folded flow plate 101 and the insulating tube 102, and the folded flow plate 104 having a curvature at the tip portion. An analysis was performed on a model simulating a case where a 1 mm minute gap 106 was generated between the end of the first electrode and the insulating cylinder 105. The curvature radius r of the folded flow plate 104 was set to 3 patterns of 5 mm, 10 mm, and 20 mm. The analysis results are shown in FIG.

  In the folded flow plate 104 having a curvature at the tip, the maximum value of the electric field strength is larger than the minimum value of the electric field strength when the horizontal folded flow plate 101 is used in any of the curvature radii r of 5 mm, 10 mm, and 20 mm. Was also confirmed to be smaller.

  In FIG. 1 to FIG. 3, the folded flow plate 7 is bent downward in the stacking direction of the disk windings 4, but is not limited thereto. For example, the disk winding 4 may be bent upward in the stacking direction.

  In the case where the folded flow plate 7 is bent downward in the stacking direction of the disk windings 4, even if foreign matters such as dust floating in the device fall on the folded flow plate 7, the folded flow plate 7 is provided on the folded flow plate 7. Due to the curved portion, foreign matter is easily slipped off, so that the effect of preventing adhesion to the folded flow plate can be obtained.

  As a result, it is possible to prevent a decrease in insulation tolerance due to foreign matter.

  Next, FIG. 5 shows the effect of suppressing the generated electric field in the minute gap 12 when the ratio of the radius of curvature r at the front end of the folded flow plate 7 in FIG. As shown in FIG. 5, when the width dimension d of the vertical duct 9 is constant, the larger the radius of curvature r at the front end of the folded flow plate 7 is, the more the electric field is generated. When the radius r is about 60% or more with respect to the width dimension d of the vertical duct 9, the obtained relaxation effect becomes a value close to a constant value.

  Therefore, a higher effect can be obtained when the radius of curvature r at the tip of the folded flow plate 7 is about 60% of the width d of the vertical duct.

  Further, when the dimensional error in manufacturing is large, in the static induction electrical apparatus of the conventional embodiment using the horizontal folded flow plate 13 as shown in FIG. A part passes through the gap 11, but a part passes through the minute gap 15. For this reason, as the disk winding 4 flows upward in the stacking direction, the flow direction in the radial direction in the winding portion 14 may not be a so-called zigzag flow that changes alternately for each folding section 10.

  On the other hand, as shown in FIG. 3, the static induction electrical apparatus of the present embodiment has a structure in which the end of the folding plate 7 located on the minute gap 12 side has a curvature toward the lower side in the axial direction. Since the pressure loss in the gap 12 increases, if the size of the minute gap 12 is about several millimeters, the insulating cooling medium will not easily pass through the minute gap 12. For this reason, a zigzag flow is likely to occur, and the insulating cooling medium can be easily and uniformly distributed inside the winding.

  According to the embodiment described above, since the generation of a high electric field around the folded plate can be suppressed, the folding plate is less subject to restrictions on the insulating surface with respect to the arrangement of the folded plate, and is folded so as to satisfy the specifications for the cooling surface. It is possible to freely determine the number of flow plates and the dimensional configuration. As a result, the cooling capacity of the winding can be increased, and in some cases, the width dimension of the gap formed by the folded plate end and the insulating tube can be reduced. For this reason, downsizing of static induction electrical equipment and cost reduction due to this can be expected.

  In addition, the folded flow plate 7 in the static induction electrical device of the present embodiment is not limited to integral molding, but may be configured to be assembled and assembled at the time of assembly. By doing so, manufacture and assembly become easy, and it can contribute to reduction of manufacturing cost.

  Furthermore, the curvature radii at the ends of the folding plates 7 need not all be the same, and the folding plates 7 where the generated electric field is expected to be relatively small are folded so that the curvature radius is reduced. The radius of curvature may be changed depending on where the flow plate 7 is disposed.

  This embodiment is presented as an example and is not intended to limit the scope of the invention. The present embodiment can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. This embodiment and its modifications are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 1 ... Iron core leg 2 ... Inner insulation cylinder 3 ... Outer insulation cylinder 4 ... Disc winding 5 ... Horizontal spacer 6 ... Vertical spacer 7, 13 ... Folding plate 8 ... Horizontal duct 9 ... Vertical duct 10 ... Folding flow district 11 ... Gap 12, 15 ... Micro gap 14 ... Winding part

Claims (3)

An inner insulating cylinder arranged to surround the iron core leg,
An outer insulating tube disposed concentrically and outside of the inner insulating tube;
A disc winding disposed between the inner insulating cylinder and the outer insulating cylinder and laminated in the axial direction;
A horizontal spacer disposed between the stacks of the disk windings to form a horizontal duct;
A vertical spacer disposed between the disk winding and the inner insulating cylinder and between the disk winding and the outer insulating cylinder and forming a vertical duct;
A folded flow plate disposed between the stacks of the disk windings and forming a folded flow zone having a plurality of the disk windings, one end in the radial direction of the folded flow plate, and the inner side Between the insulating cylinder or the outer insulating cylinder, a gap is formed alternately in the axial direction of the disk winding, and the other end in the radial direction of the folded flow plate has a curvature. . An inner insulating cylinder arranged to surround the iron core leg,
An outer insulating tube disposed concentrically and outside of the inner insulating tube;
A disc winding disposed between the inner insulating cylinder and the outer insulating cylinder and laminated in the axial direction;
A horizontal spacer disposed between the stacks of the disk windings to form a horizontal duct;
A vertical spacer disposed between the disk winding and the inner insulating cylinder and between the disk winding and the outer insulating cylinder and forming a vertical duct;
A folded flow plate disposed between the stacks of the disk windings and forming a folded flow zone having a plurality of the disk windings, one end in the radial direction of the folded flow plate, and the inner side Between the insulating cylinder or the outer insulating cylinder, gaps are formed alternately in the axial direction of the disk winding, and the other end in the radial direction of the folded flow plate has a curvature, and the circle Static induction electrical equipment bent downward in the laminating direction of the plate winding.   3. The static induction electrical device according to claim 1, wherein a radius of curvature of the end portion of the folded flow plate is approximately 60% with respect to a width dimension of the duct in the vertical direction.

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