JP2019091730A - Stationary induction appliance - Google Patents

Abstract

To further suppress deformation of winding at the time of a short circuit in a stationary induction appliance having an iron core with a rectangular cross section.SOLUTION: A transformer as a stationary induction appliance includes an iron core 1 having a rectangular cross section and an inner winding 3 and an outer winding 4 having a square or racetrack shape. Further, between the inner winding 3 and the outer winding 4, an inter-outside winding support member 5 for supporting the outer periphery 34 of the inner winding 3 and the inner periphery 44 of the outer winding 4 is disposed, and the inter-outer winding support member 5 has a corner support member 6 that abuts on corner portions 32 and 42.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a stationary induction appliance.

  Windings in a stationary induction device such as a transformer and a reactor are configured by bundling one to several wire members mainly made of copper, winding them, and laminating them in a cylindrical shape.

When a short circuit occurs in a stationary induction battery, a large current several to several tens of times flows, and this short circuit current momentarily generates excessive electromagnetic mechanical force in the winding of the stationary induction battery. Specifically, a large repulsive force (Lorentz force) acts between the inner winding and the outer winding.
When the iron core is cylindrical, or when the iron core has a substantially cylindrical shape and the winding shape can secure a sufficient space factor even if the winding shape is circular, electromagnetic mechanical force is evenly distributed by using a cylindrical winding. Therefore, the deformation of the winding is suppressed by the drag of the winding itself. Here, the space factor means the ratio of the cross-sectional area of the iron core to the inner cross-sectional area of the winding, and by increasing the space factor, the magnetic flux is less likely to leak and the efficiency is improved.
In addition, in static induction batteries with capacity up to several kilos VA, even if the cross section of the iron core and the winding shape of the winding are square (rectangular), simple support to resist the electromagnetic mechanical force generated at the time of short circuit Can.

  In Patent Document 1, a spacer member is disposed in a space formed in a straight line between an inner winding of a transformer and an iron core, and against a compressive force which causes the inner winding to be dented to the iron core side (inner side) at the time of a short circuit. A winding support structure is disclosed (see FIG. 1, paragraph 0013 of Patent Document 1).

  In the transformer described in Patent Document 1 mentioned above, the electromagnetic mechanical force at the time of short circuit is supported by the core case via the spacer member disposed between the coating of the core case and the inner winding. It has become. According to this technique, it is possible to form a winding of a stationary induction appliance having a relatively small electromagnetic mechanical force at the time of short circuit.

JP 2001-035727 A

  In recent years, in stationary induction devices, high efficiency is required from the viewpoint of environmental load reduction, and replacement of amorphous iron cores composed of amorphous alloys is also progressing for iron cores used for this purpose. It is. This requirement is the same for large power conversion stationary induction batteries, and the demand for replacement with an amorphous core is high.

  By the way, since the amorphous core is formed by laminating thin ribbons of amorphous alloy thinner than the silicon steel plate, the cross-sectional shape of the amorphous core must be rectangular from the viewpoint of its manufacturability. Therefore, unlike the conventional special high voltage (hereinafter referred to as "special high") class static induction electric machine in which the cross-sectional shape of the iron core is circular or substantially circular, the winding shape of the winding is square or racetrack. Do not get. This is because, from the viewpoint of securing the space factor described above, it is difficult to adopt a cylindrical winding that can receive the electromagnetic mechanical force at the time of short circuit due to the drag of the winding itself.

  However, when the cylindrical winding is not used with a special class capacity, the electromagnetic mechanical force acting on the winding at the time of a short circuit may be excessive, and the winding may be largely deformed. Then, if the winding is greatly deformed, the rate of change in impedance becomes large, and continuous use in one short circuit accident becomes impossible.

  The present invention has been made in view of the above-described circumstances, and an object of the present invention is to further suppress deformation of a winding at the time of a short circuit in a stationary induction device provided with an iron core having a rectangular cross section.

  In order to achieve the above object, a static induction battery according to the present invention comprises an iron core having a rectangular cross section, an inner winding concentrically arranged around the iron core, and a concentric shape around the inner winding. And an insulating material disposed between the outer winding and the inner winding, the outer winding being disposed between the inner winding and the outer winding, and supporting the outer periphery of the inner winding and the inner periphery of the outer winding. And a support member, wherein the inner winding and the outer winding are opposed to each other by a pair of parallel straight portions formed in a straight line when viewed from the direction along the axis of the iron core. Each of the connection portions has a pair of connection portions connecting the end portions to each other via a corner portion, and the connection portion is formed in a straight line shape or an outwardly convex curve shape, and the support member is the corner portion And a corner support member that abuts on the support.

  According to the present invention, in a stationary induction device provided with an iron core having a rectangular cross section, deformation of a winding at the time of a short circuit can be further suppressed.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic perspective view which shows the external appearance of the transformer which concerns on 1st Embodiment of the stationary induction battery of this invention. It is a horizontal sectional view of winding part vicinity of a transformer shown by FIG. It is sectional drawing of the inner side winding support member which concerns on a modification. It is an expanded sectional view of corner support member vicinity shown by FIG. It is a schematic diagram for demonstrating the deformation | transformation of the winding at the time of a short circuit. It is a graph which shows the relationship between the curvature radius ratio of winding, and the stress at the time of short circuit. It is an expanded sectional view near a corner support member concerning a 2nd embodiment of the present invention. It is a horizontal sectional view near a winding of a transformer concerning a 3rd embodiment of the present invention.

Embodiments of the present invention will be described in detail with reference to the drawings as appropriate.
In addition, in each figure, about the same component and the same component, the same code | symbol is attached | subjected and those duplicate description is abbreviate | omitted suitably.

First Embodiment
First, a first embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a schematic perspective view showing the appearance of a transformer 100 according to a first embodiment of the stationary induction battery of the present invention. In the present embodiment, a single-phase tripod type transformer 100 will be described as an example.
As shown in FIG. 1, the transformer 100 has an iron core 1. The iron core 1 has a main leg 11 disposed at the center and side legs 12 and 12 disposed on both sides thereof. The main leg 11 and the side leg 12 are integrally formed at the upper and lower portions. It is connected in a row.
The side legs 12 are covered with a case.

  In addition, transformer 100 includes winding 2 concentrically arranged around main leg portion 11 of iron core 1. That is, the iron core 1 is disposed to pass through the inside of the winding 2. The transformer 100 is configured by supporting the entire structure including the iron core 1 and the winding 2 by the support frame 101.

FIG. 2 is a horizontal cross-sectional view around the winding 2 of the transformer 100 shown in FIG.
As shown in FIG. 2, the iron core 1 is an amorphous iron core configured by laminating thin ribbons of amorphous alloy in order to reduce loss. For this reason, the iron core 1 has a rectangular cross section.
The iron core 1 may be divided at the long side of the rectangular cross section.

  Winding 2 includes inner winding 3 disposed concentrically around main leg 11 of core 1 and outer winding 4 disposed concentrically around inner winding 3. ing. That is, the inner winding 3 is wound and disposed outside the radial direction of the iron core 1 (direction perpendicular to the axis L of the main leg 11 of the iron core 1), and the outer winding 4 is the inner winding 3 It is wound and arrange | positioned on the radial direction outer side of. The axis L is a straight line passing through the center (centre center) of the cross section of the iron core 1 shown in FIG. Here, the inner winding 3 is configured as a low voltage side winding (secondary side winding), and the outer winding 4 is configured as a high voltage side winding (primary side winding).

  The inner winding 3 is a pair of parallel straight portions 31 formed in a straight line when viewed from the direction (vertical direction; direction perpendicular to the paper surface of FIG. 2) along the axis L of the main leg 11 of the iron core 1 And a pair of connection parts 33 which connect the opposing end parts of the respective linear parts 31 via the corner parts 32. Further, the outer winding 4 is a pair of parallel straight portions 41 formed in a straight line when viewed from the direction along the axis L of the main leg portion 11 of the iron core 1, and the opposing end portions of the respective straight portions 41. And a pair of connecting portions 43 connecting the two through the corner portion 42. In the present embodiment, the connection portions 33 and 43 are formed in an outwardly convex arc shape. That is, the winding shape of the winding 2 (inner winding 3 and outer winding 4) has a racetrack type.

  The straight portions 31 and 41 are parallel to the long side of the rectangular cross section of the iron core 1. The connection portions 33 and 43 are arc portions having a large radius corresponding to the short side of the rectangular cross section of the iron core 1. The corner portions 32 and 42 are arc portions having a small radius located between the straight portions 31 and 41 and the connection portions 33 and 43.

  Between the inner winding 3 and the outer winding 4, a support member (support member) 5 for supporting the outer circumference 34 of the inner winding 3 and the inner circumference 44 of the outer winding 4 is disposed. There is. The support member 5 between the inner and outer windings has a strip shape (band plate shape), and extends in the direction along the axis L of the main leg portion 11 of the iron core 1.

  The inner and outer winding support member 5 is formed of an insulating material. Specifically, the material of the support member 5 between the inner and outer windings is, for example, a press board (paper), but is not limited to this, and is an insulating material such as insulating wood, insulating resin (evonite etc.), etc. May be

  The inter-outer winding support member 5 has a corner support member 6 in contact with the corner portions 32, 42 and an inter-corner support member 7 in contact with the straight portions 31, 41 or the connection portions 33, 43. The corner support members 6 are separately disposed at each of the corner portions 32 and 42 located at four places. The inter-corner support member 7 is disposed between two circumferentially adjacent corner support members 6.

  The space between the adjacent inner and outer winding support members 5 (the corner support member 6 and the inter-corner support member 7) in the circumferential direction of the winding 2 has an insulating oil for cooling the winding 2 ( It can function as an oil passage into which the insulating oil flows.

  A cylindrical insulating cylinder 51 formed of an insulating material such as a press board, for example, is disposed between the inner winding 3 and the outer winding 4. The insulating cylinder 51 ensures insulation between the inner winding 3 and the outer winding 4.

  The inter-outer winding support member 5 includes an inner portion 61, 71 disposed on the inner winding 3 side (inner side) of the insulating cylinder 51, and an outer winding of the inner portion 61, 71 with the insulating cylinder 51 interposed therebetween. And outer portions 62 and 72 disposed on the four sides (outside). The outer winding 4 is wound on the inner and outer winding support member 5 in a state where the inner and outer winding support member 5 is set on the outer side of the inner winding 3 together with the insulating cylinder 51.

  An inner winding support member 8 is disposed between the iron core 1 and the inner winding 3 to support the entire inner circumference of the inner winding 3. The inner winding support 8 is also generally of the racetrack type. The inner winding support member 8 is formed of an insulating material. As a material of the inner winding support member 8, for example, the same material as that of the inner and outer winding support member 5 may be used.

FIG. 3 is a cross-sectional view of an inner winding support member 8a according to a modification.
As shown in FIG. 3, an oil passage 81 into which insulating oil for cooling the winding 2 flows is formed on the outer periphery of the inner winding support member 8 a. The oil passage 81 is, for example, a groove extending in the vertical direction (direction perpendicular to the paper surface of FIG. 3).

  As shown in FIG. 2, an outer winding support member 9 for supporting an outer periphery of the straight portion 41 of the outer winding 4 is disposed outside the straight portion 41 of the outer winding 4. The outer winding support member 9 is formed of an insulating material. As a material of the outer winding support member 9, for example, the same material as that of the inner and outer winding support member 5 may be used. The outer side (opposite to the outer winding 4) of the outer winding support member 9 is supported by a structure not shown.

FIG. 4 is an enlarged cross-sectional view around the corner support member 6 shown in FIG.
As shown in FIG. 4, the corner support member 6 has a connection point 35 between the corner portion 32 and the straight portion 31 in the outer periphery 34 of the inner winding 3 and a corner portion 32 and a connection portion 33 in the outer periphery 34 of the inner winding 3. In contact with the connection point 36 of Here, at the outer periphery 34 of the inner winding 3, the connection point 35 is a change point that changes from the corner portion 32 to the linear portion 31, and the connection point 36 is a change point that changes from the corner portion 32 to the connection portion 33 is there.

  In addition, the corner support member 6 is a connection point 45 between the corner portion 42 and the straight portion 41 in the inner periphery 44 of the outer winding 4 and a connection between the corner portion 42 and the connection portion 43 in the inner periphery 44 of the outer winding 4. It is in contact with the point 46. Here, at the inner periphery 44 of the outer winding 4, the connection point 45 is a change point that changes from the corner portion 42 to the straight line portion 41, and the connection point 46 is a change point that changes from the corner portion 42 to the connection portion 43 It is.

Next, the operation of transformer 100 configured as described above will be described.
When a short circuit occurs on the low voltage side or the high voltage side of the transformer 100, a large current flows in the winding 2, and a large repulsive force (electromagnetic mechanical force) acts between the inner winding 3 and the outer winding 4.

FIG. 5 is a schematic view for explaining the deformation of the winding 2 at the time of a short circuit. In FIG. 5, for convenience of explanation, the outer periphery 34 of the inner winding 3 and the inner periphery 44 of the outer winding 4 are mainly shown, and illustration of the corner support member 6 is omitted.
As shown in FIG. 5, at the time of a short circuit, in the inner winding 3, both the straight portion 31 and the connecting portion 33 which is a circular arc portion having a large radius tend to be deformed inward (the two-dot chain line in FIG. Shown). As a result, the corner portion 32, which is an arc portion having a small radius located between the straight portion 31 and the connection portion 33, tends to be deformed in a form that protrudes outward and is bent.

  Further, at the time of a short circuit, in the outer winding 4, both the straight portion 41 and the connecting portion 43 which is an arc portion having a large radius tend to be deformed outward (shown schematically by a two-dot chain line in FIG. 5). As a result, the corner portion 42 which is an arc portion having a small radius located between the straight portion 41 and the connection portion 43 tries to be deformed in such a manner as to fall inward.

That is, at the time of a short circuit, in the corner portions 32 and 42, the inner winding 3 and the outer winding 4 try to deform in the direction in which they approach each other. At this time, a large stress is generated due to the stress concentration at the corner portions 32, 42, particularly at the connection points 35, 36, 45, 46 (see FIG. 4). If the generated stress exceeds the allowable stress, excessive deformation may occur, and permanent deformation (plastic deformation) may remain even after the short circuit is eliminated.
In the present embodiment, by arranging the corner support member 6 (see FIGS. 2 and 4) between the inner winding 3 and the outer winding 4, the corner portion 32 of the inner winding 3 and the outer winding 4 are obtained. The function of suppressing the deformation of the corner portions 42 is exhibited.

FIG. 6 is a graph showing the relationship between the radius of curvature ratio of the winding 2 and the stress generated upon short circuiting.
The horizontal axis in FIG. 6 indicates the ratio (curvature radius ratio) P between the radius of curvature R1 (see FIG. 2) of the corner portion 42 and the radius of curvature R2 (see FIG. 2) of the connecting portion 43 at the outer periphery of the outer winding 4. . Further, the vertical axis in FIG. 6 indicates the maximum stress σ generated in the winding 2 at the time of the short circuit.
In FIG. 6, the radius of curvature ratio P is indicated by the value of the ratio.

  As shown in FIG. 6, when the curvature radius R1 of the corner portion 42 is too small, the maximum stress σ generated at the time of the short circuit becomes excessive. In addition, even if the curvature radius R1 of the corner portion 42 is too large, the maximum stress σ generated at the time of the short circuit tends to be large. More specifically, as shown in FIG. 6, the maximum stress σ generated at the time of a short circuit is considerably low in the radius of curvature ratio P in the range of 1: 7 to 1: 4, and the radius of curvature ratio P is 1 : 5 is the smallest. That is, the maximum stress σ decreases slightly as the radius of curvature ratio P goes from 1: 7 to 1: 5, and slightly as the radius of curvature ratio P goes from 1: 5 to 1: 4. Therefore, it can be said that the radius of curvature ratio P is preferably in the range of 1: 4 to 1: 7.

  As described above, the transformer 100 according to the present embodiment includes the iron core 1 having a rectangular cross section, and the inner winding 3 and the outer winding 4 having a racetrack shape. Further, between the inner winding 3 and the outer winding 4, an inter-outside winding support member 5 for supporting the outer periphery 34 of the inner winding 3 and the inner periphery 44 of the outer winding 4 is disposed, The inter-outer winding support member 5 has a corner support member 6 that abuts on the corner portions 32 and 42.

According to such an embodiment, even when a large repulsive force (electromagnetic mechanical force) is exerted between the inner winding 3 and the outer winding 4 at the time of short circuit, they are deformed so as to approach each other to generate a large stress. The corners 32 of the inner winding 3 and the corners 42 of the outer winding 4 can be supported by the corner support member 6. For this reason, the deformation of the corner portion 32 of the inner winding 3 and the corner portion 42 of the outer winding 4 can be suppressed to one another, and in turn, the excessive deformation of the entire winding 2 can be suppressed.
That is, in transformer 100 provided with iron core 1 having a rectangular cross section, deformation of winding 2 at the time of short circuit can be further suppressed.
Thereby, it can suppress that characteristics, such as an impedance, deteriorate by the excessive deformation | transformation of the winding 2 at the time of a short circuit.

  Further, in the present embodiment, the corner support member 6 is in contact with the connection points 35 and 36 on the outer periphery 34 of the inner winding 3 and the connection points 45 and 46 on the inner periphery 44 of the outer winding 4. According to such a configuration, since the connection points 35, 36, 45, 46 of the winding 2 in which stress concentration is particularly likely to occur are supported by the corner support member 6, stress concentration is alleviated. Therefore, the deformation of the winding 2 at the time of short circuit can be further suppressed.

Further, in the present embodiment, the ratio (curvature radius ratio) P between the curvature radius R1 of the corner portion 42 and the curvature radius R2 of the connection portion 43 at the outer periphery of the outer winding 4 is in the range of 1: 4 to 1: 7. is there.
According to such a configuration, it is possible to lower the maximum stress σ generated in the winding 2 at the time of the short circuit. Therefore, the deformation of the winding 2 at the time of short circuit can be further suppressed.

Further, in the present embodiment, the inter-outer winding support member 5 includes the inner portions 61 and 71 disposed on the inner winding 3 side of the insulating cylinder 51 and the inner portions 61 and 71 with the insulating cylinder 51 interposed therebetween. And an outer portion 62, 72 disposed on the outer winding 4 side of the
According to such a configuration, by arranging the inner portions 61 and 71 and the outer portions 62 and 72 on the inside and the outside of the insulating cylinder 51, the insulation between the inner winding 3 and the outer winding 4 is ensured. The workability of the installation of the support member 5 between the inner and outer windings can be improved. Furthermore, the space in which the inter-inner / outer winding support member 5 in the inside and outside of the insulating cylinder 51 is not disposed can function as an oil passage into which the insulating oil for cooling the winding 2 flows.

Further, in the present embodiment, an inner winding support member 8 is disposed between the iron core 1 and the inner winding 3 for supporting the inner circumference of the inner winding 3 over the entire circumference.
According to such a configuration, the inner winding 3 can be reliably supported against the electromagnetic mechanical force which tends to deform the inner winding 3 into the iron core 1 (inward) at the time of short circuit. Therefore, the deformation of the inner winding 3 at the time of short circuit can be further suppressed.

  Moreover, in the present embodiment, it is preferable to form the oil passage 81 on the outer periphery of the inner winding support member 8a. In this way, the winding 2 can be cooled more effectively.

Further, in the present embodiment, the outer winding support member 9 that supports the outer periphery of the straight portion 41 of the outer winding 4 is disposed outside the straight portion 41 of the outer winding 4.
According to such a configuration, the outer winding support member 9 reliably supports the straight portion 41 of the outer winding 4 against the electromagnetic mechanical force that tends to deform the outer winding 4 to the outside at the time of a short circuit. can do. Therefore, the deformation of the outer winding 4 at the time of short circuit can be further suppressed.

Second Embodiment
Next, a second embodiment of the present invention will be described with reference to FIG. 7, focusing on the differences from the first embodiment described above, and the description of the common points will be omitted.

FIG. 7 is an enlarged sectional view around the corner support member 6 a according to the second embodiment of the present invention.
As shown in FIG. 7, the corner support member 6a is divided in the circumferential direction of the winding 2 (inner winding 3 and outer winding 4), and has a first member 63 and a second member 64. ing.

  The first member 63 is connected to a connecting point 35 of the corner portion 32 and the straight portion 31 in the outer periphery 34 of the inner winding 3 and a connecting point 45 of the corner portion 42 and the straight portion 41 in the inner periphery 44 of the outer winding 4. It abuts. Further, the second member 64 is a connection point 36 between the corner portion 32 and the connection portion 33 in the outer periphery 34 of the inner winding 3 and a connection point between the corner portion 42 and the connection portion 43 in the inner periphery 44 of the outer winding 4. It is in contact with 46.

  The corner support member 6 of the first embodiment has a long length in the circumferential direction of the winding 2 (the width direction of the strip-like corner support member 6) as shown in FIG. In the case of manufacturing, it is difficult to form a curved shape along the circumferential direction of the winding 2. On the other hand, the corner support member 6a of the second embodiment is divided into a first member 63 and a second member 64.

  According to the second embodiment, since the length of the corner support member 6a in the circumferential direction of the winding 2 is short, the corner support member 6a hardly needs to be formed in a curved shape, and the manufacture becomes easy. Further, the space between the first member 63 and the second member 64 in the circumferential direction of the winding 2 can function as an oil passage into which the insulating oil for cooling the winding 2 flows.

Third Embodiment
Next, with reference to FIG. 8, a third embodiment of the present invention will be described focusing on differences from the first embodiment described above, and a description of common points will be omitted.

FIG. 8 is a horizontal cross-sectional view of the vicinity of a winding 2a of a transformer according to a third embodiment of the present invention.
As shown in FIG. 8, in the third embodiment, the connection portions 33 a and 43 a are formed in a linear shape. That is, the winding shape of the winding 2a (the inner winding 3a and the outer winding 4a) has a square shape. The inner winding support member 8b also has a rectangular shape.

  Outside winding support member 9a which supports the perimeter of connecting part 43a of outside winding 4a is arranged on the outside of straight connection part 43a of outside winding 4a. The outer winding support member 9a is formed of an insulating material. As the material of the outer winding support member 9a, for example, the same material as that of the inner and outer winding support member 5 may be used. The outer side (opposite to the outer winding 4a) of the outer winding support member 9a is supported by a structure not shown.

  According to such a third embodiment, the same function and effect as those of the first embodiment can be obtained. That is, the present invention is also applicable to a transformer provided with an iron core 1 having a rectangular cross section, and a winding 2a (inner winding 3a and outer winding 4a) whose winding shape exhibits a square shape.

  Further, in the case of a transformer of a special class capacity, the electromagnetic mechanical force largely acts in the direction of deforming the linear connection portion 43a of the outer winding 4a to the outside at the time of short circuit, but the outer winding support member 9a is excessively large. It is possible to reliably support the connection portion 43a of the outer winding 4a against any electromagnetic mechanical force. However, in the case of a relatively small capacity transformer, the outer winding support member 9a may be omitted.

  As mentioned above, although this invention was demonstrated based on embodiment, this invention is not limited to above-mentioned embodiment and modification, The further various modification is included. For example, the above-described embodiments are described in detail to explain the present invention in an easy-to-understand manner, and are not necessarily limited to those having all the described configurations. Further, part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. Moreover, it is possible to add, delete, and replace other configurations for part of the configurations of the respective embodiments.

For example, although the single-phase tripod type transformer 100 has been described in the above embodiment, the present invention is not limited to this, and is also applicable to, for example, a three-phase five-leg type transformer.
Moreover, although the said embodiment demonstrated the transformer 100, this invention is not limited to this, For example, it is applicable also to other stationary induction machines, such as a reactor.

  Further, in the first embodiment, the connection portions 33 and 43 of the winding 2 (the inner winding 3 and the outer winding 4) are formed in an outwardly convex arc shape, but they are not necessarily strictly arc shapes. It does not need to be present, and it may be curved, for example, an elliptic arc.

  Moreover, in the said 2nd Embodiment, although the corner support member 6a is divided into 2 by the 1st member 63 and the 2nd member 64 in the circumferential direction of the winding 2 (refer FIG. 7), It is not limited and may be divided into three or more.

  Moreover, in the said embodiment, although one between the corner support members 7 is arrange | positioned between the two corner support members 6 adjacent to the circumferential direction (refer FIG. 2, FIG. 8), it is limited to this It is not a thing but multiple pieces may be arrange | positioned, or it is also possible to abbreviate | omit arrangement | positioning.

1 iron core 2, 2a winding 3, 3a inner winding 4, 4a outer winding 5 support member between inner and outer winding (supporting member)
6, 6a Corner support member 7 Inter-corner support member 8, 8a, 8b Inner winding support member 9, 9a Outer winding support member 11 Main leg portion 12 Side leg portion 31, 41 Straight portion 32, 42 Corner portion 33, 33a , 43, 43a Connection part 34 Outer circumference 35, 36, 45, 46 Connection point 44 Inner circumference 51 Insulating cylinder 61, 71 Inner part 62, 72 Outer part 63 First member 64 Second member 81 Oil passage 100 Transformer L axis

Claims (8)

An iron core having a rectangular cross section;
An inner winding concentrically disposed around the core;
An outer winding concentrically disposed around the inner winding;
A support member formed of an insulating material disposed between the inner winding and the outer winding and supporting an outer periphery of the inner winding and an inner periphery of the outer winding;
The inner winding and the outer winding are a pair of parallel straight portions formed in a straight line when viewed from the direction along the axis of the iron core, and the opposing end portions of the respective straight portions are corner portions. Each having a pair of connection parts connected via
The connection portion is formed in a straight line shape or a curve shape convex outward,
The stationary induction battery according to claim 1, wherein the support member includes a corner support member that abuts on the corner portion.   The corner support member is a connection point between a corner and a straight part at the outer periphery of the inner winding, a connection point between a corner and a connection at the outer periphery of the inner winding, and a corner at the inner periphery of the outer winding. The stationary induction battery according to claim 1, wherein the stationary induction battery is in contact with a connection point between the first and second straight portions and a connection point between a corner portion and a connection portion on the inner periphery of the outer winding.   The corner support member is divided in the circumferential direction of the inner winding and the outer winding, and a connection point between a corner portion and a straight portion in the outer periphery of the inner winding and an inner periphery of the outer winding. A first member abutting on a connection point between a corner and a straight part, a connection point between a corner and a connection on an outer periphery of the inner winding, and a corner and a connection on an inner periphery of the outer winding The stationary induction battery according to claim 2, further comprising: a second member abutting on the connection point. The connecting portion is formed in an outwardly convex arc shape,
The stationary induction battery according to claim 1, wherein the ratio of the radius of curvature of the corner portion to the radius of curvature of the connecting portion at the outer periphery of the outer winding is in the range of 1: 4 to 1: 7. A cylindrical insulating cylinder formed of an insulating material is disposed between the inner winding and the outer winding,
The support member includes an inner portion disposed on the inner winding side of the insulating cylinder, and an outer portion disposed on the outer winding side of the inner portion with the insulating cylinder interposed therebetween. The stationary induction battery according to claim 1, characterized in that it comprises:   An inner winding support member formed of an insulating material for supporting the inner periphery of the inner winding over the entire circumference is disposed between the iron core and the inner winding. Stationary induction appliance as described.   The stationary induction battery according to claim 6, wherein an oil passage into which an insulating oil flows in is formed on the outer periphery of the inner winding support member.   The outer winding support member formed of an insulating material for supporting the outer periphery of the straight portion of the outer winding is disposed outside the straight portion of the outer winding. Stationary induction machine.

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