JP2010206000A - Transformer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a transformer for preventing the deterioration of insulation properties and the reduction of the cooling performance. <P>SOLUTION: The transformer includes: a shaft iron core 1; a secondary winding wire 3 wound around the iron core 1; a primary winding wire 2 wound around the iron core 1 on the outer periphery of the secondary winding wire 3; a first cylinder shaped member 12 having an insulating property and disposed between the primary winding wire 2 and the secondary winding wire 3; a second cylinder shaped member 13 having an insulating property and being disposed between the primary winding wire 2 and the secondary winding wire 3, and on the outside periphery of the first cylinder shaped member 12; and a first spacer 40 having an insulating property, and being disposed in one part in the axis direction of the iron core 1 of the space 60 between the first cylinder shaped member 12 and the second cylinder shaped member 13. The first spacer 40 is disposed so as to control the mutual position of the first cylinder shaped member 12 and the second cylinder shaped member 13 in the radial direction centering around the iron core 1 and to prevent the passage of an insulating gas in the space 60. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a transformer, and more particularly to a transformer whose windings are cooled by an insulating gas.

  For cooling the heat generated by the windings (coils) of the transformer, for example, a pump for circulating an insulating gas and a cooler are used. A plurality of spacers are provided between the primary winding and the secondary winding of the transformer. The spacer has a role of securing a flow path of the insulating gas and holding the winding when a mechanical force due to a short circuit is generated.

  As a technique for cooling the winding of the transformer, for example, Patent Document 1 discloses the following transformer. That is, a plurality of windings arranged concentrically with respect to the iron core, and a plurality of insulating tubes concentrically with respect to the iron core between these windings, and a plurality of insulating properties between the insulating tubes. In the gas insulated transformer in which the spacing material is disposed, the spacing materials adjacent to each other in the insulation distance direction between the windings are arranged so as not to be aligned on the same radial direction.

  Patent Document 2 discloses the following transformer. That is, a plurality of block-like spacing pieces between the low-voltage winding and the high-voltage winding are formed, and are arranged in the circumferential direction and the vertical direction of the winding via the gas space.

  Patent Document 3 discloses the following transformer. That is, the transformer contents comprising an iron core having at least one iron core leg and a winding inserted in the iron core leg are housed in a sealed container provided with a cooler on at least one side surface. An insulating gas is sealed in the container.

Japanese Patent No. 3461889 Japanese Patent Laid-Open No. 10-326714 JP-A-6-84653

  By the way, in the transformer in which the winding is cooled by the insulating gas and the spacer is provided, the insulating gas exists in a minute gap between the spacer, the primary winding, the secondary winding, and other spacers. If it does so, the electric field strength in this clearance gap will become high and insulation will fall.

  For example, in the transformer described in Patent Document 1, since a strip-shaped spacer (insulating spacing material) is used, a minute gap between the spacer and the primary winding, the secondary winding, and other spacers. The area of becomes larger. If it does so, a part with high electric field strength will increase and insulation will fall.

  Further, when the voltage applied to the primary winding and the secondary winding is increased, it is necessary to increase the distance between the primary winding and the secondary winding in order to ensure the insulation state. However, in the transformer described in Patent Document 2, when the distance between the primary winding and the secondary winding is increased, the flow of the insulating gas is widened, so that the flow of the insulating gas is slowed and the cooling performance is reduced. End up.

  Further, Patent Document 3 does not disclose a configuration for solving the above problems.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a transformer capable of preventing a decrease in insulation and preventing a decrease in cooling performance.

  In order to solve the above-described problems, a transformer according to an aspect of the present invention is a transformer in which a winding is cooled by an insulating gas, and includes an axial iron core and a secondary winding wound around the iron core. A primary winding wound around the iron core on the outer peripheral side of the secondary winding, and a first tubular member having insulation and provided between the primary winding and the secondary winding; The second cylindrical member provided between the primary winding and the secondary winding and provided on the outer peripheral side of the first cylindrical member; A first spacer provided in a part of the space between the one cylindrical member and the second cylindrical member in the axial direction of the iron core, and the first spacer has a diameter centered on the iron core. It arrange | positions so that the position of the 1st cylindrical member and the 2nd cylindrical member may be controlled in the direction and the passage of the insulating gas in the space may be inhibited.

  A transformer according to another aspect of the present invention is a transformer in which a winding is cooled by an insulating gas, and includes an axial iron core, a secondary winding wound around the iron core, and a secondary winding. A primary winding wound around an iron core on the outer peripheral side of the first cylindrical member having insulation and a first cylindrical member provided between the primary winding and the secondary winding, and having insulation A second cylindrical member provided between the primary winding and the secondary winding and provided on the outer peripheral side of the first cylindrical member, and having insulation, the first cylindrical member and A spacer provided between the second cylindrical members, the spacer preferably having a dielectric constant close to the dielectric constant of the insulating gas, and the first cylindrical member and the second cylindrical member in the radial direction centered on the iron core. The cylindrical members are arranged so as to restrict the positions of the cylindrical members and to inhibit the passage of the insulating gas in the space between the first cylindrical member and the second cylindrical member. It is.

  According to the present invention, it is possible to prevent a decrease in insulation and a decrease in cooling performance.

It is a schematic sectional drawing which shows the structure of the transformer which concerns on the 1st Embodiment of this invention. It is sectional drawing which shows the II-II cross section in FIG.1, FIG.3 and FIG.4 of the primary winding, secondary winding, and iron core in the transformer which concerns on the 1st Embodiment of this invention. It is sectional drawing which shows the III-III cross section in FIG. 2 of the primary winding in the transformer which concerns on the 1st Embodiment of this invention, a secondary winding, and an iron core. It is sectional drawing which shows the IV-IV cross section in FIG. 2 of the primary winding, the secondary winding, and iron core in the transformer which concerns on the 1st Embodiment of this invention. It is a figure which shows the flow of the insulating gas in the primary winding, the secondary winding, and iron core in the transformer which concerns on the 1st Embodiment of this invention. It is sectional drawing which shows the VI-VI cross section in FIG. 7 and FIG. 8 of the primary winding in the transformer which concerns on the 2nd Embodiment of this invention, a secondary winding, and an iron core. It is sectional drawing which shows the VII-VII cross section in FIG. 6 of the primary winding, the secondary winding, and iron core in the transformer which concerns on the 2nd Embodiment of this invention. It is sectional drawing which shows the VIII-VIII cross section in FIG. 6 of the primary winding in the transformer which concerns on the 2nd Embodiment of this invention, a secondary winding, and an iron core.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and description thereof will not be repeated.

<First Embodiment>
FIG. 1 is a schematic cross-sectional view showing the configuration of the transformer according to the first embodiment of the present invention.

  Referring to FIG. 1, a transformer 101 includes an iron core 1, a primary winding 2, a secondary winding 3, a tank 4, a radiator 5, a gas blower 6, a lower end frame 7, and an upper portion. An end frame 8, a pressing plate 9, a gas stopper plate 10, and cylinders (tubular members) 11 to 14 are provided.

  The tank 4 is filled with an insulating gas 15, and includes an iron core 1, a primary winding 2, a secondary winding 3, a lower end frame 7, an upper end frame 8, a press plate 9, and a gas stopper. The board 10 and the cylinders 11 to 14 are accommodated. The insulation gas 15 insulates and cools the primary winding 2 and the secondary winding 3.

  The gas blower 6 is a blower that forcibly circulates an insulating gas in the transformer 101. The gas blower 6 circulates the insulating gas 15 through the tank 4 and the radiator 5 as indicated by arrows in the figure.

  The radiator 5 allows the insulating gas 15 flowing from the tank 4 to pass through while cooling. The insulating gas 15 cooled by the radiator 5 flows into the gas blower 6. The insulating gas 15 sent from the gas blower 6 cools the primary winding 2 and the secondary winding 3 by passing through the tank 4.

  The lower end frame 7 is a member having a function of fastening the lower portion of the iron core 1 and mounting the primary winding 2 and the secondary winding 3. The upper end frame 8 is a member having a function of fastening the upper part of the iron core 1 and supporting the pressing plate 9. The holding plate 9 is a plate that holds the primary winding 2 and the secondary winding 3. The gas stop plate 10 is attached when the insulating gas is forcibly circulated, and is provided for flowing the insulating gas only through the primary winding 2 and the secondary winding 3.

  FIG. 2 is a cross-sectional view of the primary winding, the secondary winding, and the iron core in the transformer according to the first embodiment of the present invention, taken along the line II-II in FIGS. 1, 3, and 4.

  FIG. 3 is a cross-sectional view showing a III-III cross section in FIG. 2 of the primary winding, the secondary winding, and the iron core in the transformer according to the first embodiment of the present invention.

  4 is a cross-sectional view showing a IV-IV cross section in FIG. 2 of the primary winding, the secondary winding, and the iron core in the transformer according to the first embodiment of the present invention.

  2 to 4, the transformer 101 further includes strip-shaped spacers 20, 21, 23, centering spacers 24, 25, a zigzag stopper 26, an insulating block 27, and a ring-shaped spacer 40. Is provided.

  The secondary winding 3 is wound around the shaft-shaped iron core 1. The primary winding 2 is wound around the iron core 1 on the outer peripheral side of the secondary winding 3. Each of primary winding 2 and secondary winding 3 includes, for example, a plurality of stacked disc-shaped disc windings. Adjacent layers of disk windings are electrically connected. Each disk winding in the primary winding 2 and the secondary winding 3 is formed by a conductive line having a rectangular cross section wound in a substantially circular shape.

  The cylinder 11 has insulating properties and is provided between the iron core 1 and the secondary winding 3. The cylinder 12 has an insulating property and is provided between the primary winding 2 and the secondary winding 3. The cylinder 13 has insulating properties and is provided between the primary winding 2 and the secondary winding 3 and is provided on the outer peripheral side of the cylinder 12. The cylinder 14 has insulating properties and is provided on the outer peripheral side of the primary winding 2.

  A flow path of the insulating gas 15 for cooling the secondary winding 3 is formed in the space between the cylinder 11 and the cylinder 12, and the primary winding 2 is connected in the space between the cylinder 13 and the cylinder 14. A flow path of the insulating gas 15 for cooling is formed.

  The center spacer 24 is insulative and is inserted between the disk windings adjacent to each other in the stacking direction of the secondary winding 3 and is in close contact with these disk windings. Thereby, the secondary winding 3 is supported in the axial direction of the iron core 1.

  The center spacer 25 is insulative and is inserted between the disk windings adjacent to each other in the stacking direction of the primary winding 2 and is in close contact with these disk windings. Thereby, the primary winding 2 is supported in the axial direction of the iron core 1.

  The strip-shaped spacer 20 extends in the axial direction of the iron core 1, and is in close contact with the cylinder 11, the secondary winding 3, and the core spacer 24 in the space between the cylinder 11 and the secondary winding 3. The strip-shaped spacer 21 extends in the axial direction of the iron core 1 and is in close contact with the secondary winding 3, the central spacer 24 and the cylinder 12 in the space between the secondary winding 3 and the cylinder 12. The strip-shaped spacer 23 extends in the axial direction of the iron core 1, and is in close contact with the cylinder 13, the primary winding 2, and the core spacer 25 in the space between the cylinder 13 and the primary winding 2.

  The zigzag stopper 26 has an insulating property and extends in the radial direction around the iron core 1 and is provided in a space between the cylinder 11 and the cylinder 12 and a space between the cylinder 13 and the cylinder 14, respectively. . The zigzag stopper 26 is a member for changing the direction in which the insulating gas flows in the primary winding 2 and the secondary winding 3.

  The insulating block 27 is a member that has insulating properties and secures an insulating distance between the primary winding 2 and the secondary winding 3 and the iron core 1.

  The ring-shaped spacer 40 has insulating properties and is provided in a part of the space 60 between the cylinder 12 and the cylinder 13 in the axial direction of the iron core 1. More specifically, a plurality of ring-shaped spacers 40 are provided at intervals in the axial direction of the iron core 1.

  Further, the ring-shaped spacer 40 regulates the positions of the cylinder 12 and the cylinder 13 in the radial direction around the iron core 1. More specifically, the ring-shaped spacer 40 is in close contact with the cylinder 12 and the cylinder 13 in the space 60. With the ring-shaped spacer 40 and the strip-shaped spacers 20, 21, and 23, the primary winding 2, the secondary winding 3, the center spacer 24, and the center spacer 25 are arranged in a radial direction centering on the iron core 1. It is supported.

  Further, the ring-shaped spacer 40 is arranged so as to overlap the center-spaced spacers 24 and 25 in the radial direction around the iron core 1. With such a configuration, it is possible to increase the strength of the primary winding 2 and the secondary winding 3 with respect to the radial mechanical force centered on the iron core 1.

  The ring-shaped spacer 40 is disposed so as to inhibit the passage of the insulating gas 15 in the space 60. More specifically, the insulating gas 15 can flow into the space 60, but the ring spacer 40 is arranged so as to partition the space 60 on one side and the other side in the axial direction of the iron core 1. Yes. Thereby, the passage of the insulating gas 15 in the space 60 is inhibited.

  FIG. 5 is a diagram showing the flow of insulating gas in the primary winding, the secondary winding, and the iron core in the transformer according to the first embodiment of the present invention. FIG. 5 corresponds to the cross-sectional view shown in FIG.

  Referring to FIG. 5, the insulating gas 15 is controlled in the flow direction by the cylinder 11, the cylinder 12, the cylinder 13, the cylinder 14, and the zigzag stopper 26 as indicated by arrows in the drawing, that is, The primary winding 2 and the secondary winding 3 are cooled through the path formed by these members.

  In the transformer according to the first embodiment of the present invention, the cylinder 12 has an insulating property and is provided between the primary winding 2 and the secondary winding 3. The cylinder 13 has insulating properties and is provided between the primary winding 2 and the secondary winding 3 and is provided on the outer peripheral side of the cylinder 12. The ring-shaped spacer 40 is provided in a part of the space 60 between the cylinder 12 and the cylinder 13 in the axial direction of the iron core 1. With such a configuration, the area of a minute gap between the spacer, the primary winding, the secondary winding, and other spacers can be reduced, so that a decrease in insulation can be prevented.

  In the transformer described in Patent Document 2, when the distance between the primary winding and the secondary winding is increased in order to ensure the insulation state, the flow of the insulating gas is widened. Performance will be degraded.

  However, in the transformer according to the first embodiment of the present invention, the cylinder 12 and the cylinder 13 are provided between the primary winding 2 and the secondary winding 3, and the ring-shaped spacer 40 includes the cylinder 12 and the cylinder. 13 is arranged so as to inhibit the passage of the insulating gas 15 in the space 60 between the two.

  With such a configuration, if the distance between the cylinder 12 and the cylinder 13 is increased, the distance between the primary winding and the secondary winding is increased, and an insulating state can be ensured. On the other hand, even if the distance between the cylinder 12 and the cylinder 13 is increased, the flow path of the insulating gas 15 does not expand. Therefore, in the transformer according to the first embodiment of the present invention, the cooling performance can be improved by improving the insulating property and increasing the flow rate of the insulating gas. Further, the width of the flow path of the insulating gas can be adjusted by adjusting the distance between the cylinder 12 and the cylinder 13.

  In addition, the spacer between the primary winding and the secondary winding needs to be long to some extent in the circumferential direction of the primary winding and the secondary winding so as not to fall down. As a result, the area of a minute gap between the spacer, the primary winding, the secondary winding, and the other spacers increases, so that the portion with high electric field strength increases and the insulation performance decreases.

  However, in the transformer according to the first embodiment of the present invention, the distance between the cylinder 12 and the cylinder 13 can be increased by providing the cylinders 12 and 13 between the primary winding 2 and the secondary winding 3. For example, since the distance between the primary winding and the secondary winding can be increased, the strip spacers 21 and 23 can be shortened in the circumferential direction of the primary winding and the secondary winding. Thereby, since the part with a high electric field strength can be decreased, the fall of insulation can be prevented.

  In the transformer according to the first embodiment of the present invention, the ring-shaped spacer 40 is provided. However, the present invention is not limited to this, and an insulating gas is present in the space between the cylinders 12 and 13. What is necessary is just a member arrange | positioned so that it may flow.

  Further, the transformer according to the first embodiment of the present invention is configured to include the two cylinders 12 and 13 between the primary winding 2 and the secondary winding 3, but the present invention is limited to this. Instead, the configuration may be such that three or more cylinders are provided between the primary winding 2 and the secondary winding 3.

  In the transformer according to the first embodiment of the present invention, the ring spacer 40 is provided in a part of the space 60 between the cylinder 12 and the cylinder 13 in the axial direction of the iron core 1. However, the present invention is not limited to this. Even if it is not such a spacer, it is desirable that the dielectric constant is close to the dielectric constant of the insulating gas 15, and the mutual positions of the cylinder 12 and the cylinder 13 are regulated in the radial direction around the iron core 1, and the insulation in the space 60 is achieved. What is necessary is just a member arrange | positioned so that passage of the gas 15 may be inhibited.

  Next, another embodiment of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and description thereof will not be repeated.

<Second Embodiment>
The present embodiment relates to a transformer in which the structure of the secondary winding is changed as compared with the transformer according to the first embodiment. The contents other than those described below are the same as those of the transformer according to the first embodiment.

  FIG. 6 is a cross-sectional view showing a VI-VI cross section in FIGS. 7 and 8 of the primary winding, the secondary winding, and the iron core in the transformer according to the second embodiment of the present invention.

  FIG. 7 is a cross-sectional view showing a section VII-VII in FIG. 6 of the primary winding, the secondary winding, and the iron core in the transformer according to the second embodiment of the present invention.

  FIG. 8 is a cross-sectional view showing a VIII-VIII cross section in FIG. 6 of the primary winding, the secondary winding, and the iron core in the transformer according to the second embodiment of the present invention.

  6 to 8, the transformer 102 includes a secondary winding 33 instead of the secondary winding 3. The transformer 102 further includes strip spacers 20, 21, 23, 30, 31, a center spacer 25, a zigzag stopper 26, an insulating block 27, and a ring spacer 40.

  The secondary winding 33 is wound around the shaft-shaped iron core 1. The primary winding 2 is wound around the iron core 1 on the outer peripheral side of the secondary winding 33. The primary winding 2 includes, for example, a plurality of stacked disc-shaped disc windings. Adjacent layers of disk windings are electrically connected. The secondary winding 33 includes cylindrical windings 33A, 33B, 33C arranged in a concentric manner, for example. Adjacent cylindrical windings are electrically connected. Each disk winding in the primary winding 2 and each cylindrical winding in the secondary winding 33 are formed by conductive lines having a rectangular cross section wound in a substantially circular shape.

  The cylinder 11 has an insulating property and is provided between the iron core 1 and the secondary winding 33. The cylinder 12 has an insulating property and is provided between the primary winding 2 and the secondary winding 33. The cylinder 13 has an insulating property and is provided between the primary winding 2 and the secondary winding 33 and is provided on the outer peripheral side of the cylinder 12. The cylinder 14 has insulating properties and is provided on the outer peripheral side of the primary winding 2.

  A flow path of the insulating gas 15 for cooling the secondary winding 33 is formed in the space between the cylinder 11 and the cylinder 12, and the primary winding 2 is formed in the space between the cylinder 13 and the cylinder 14. A flow path of the insulating gas 15 for cooling is formed.

  The center spacer 25 is insulative and is inserted between the disk windings adjacent to each other in the stacking direction of the primary winding 2 and is in close contact with these disk windings. Thereby, the primary winding 2 is supported in the axial direction of the iron core 1.

  The strip spacer 20 extends in the axial direction of the iron core 1, and is in close contact with the cylinder 11 and the cylindrical winding 33A in a space between the cylinder 11 and the cylindrical winding 33A. The strip-shaped spacer 30 extends in the axial direction of the iron core 1 and is in close contact with the cylindrical winding 33A and the cylindrical winding 33B in a space between the cylindrical winding 33A and the cylindrical winding 33B. The strip spacer 31 extends in the axial direction of the iron core 1 and is in close contact with the cylindrical winding 33B and the cylindrical winding 33C in a space between the cylindrical winding 33B and the cylindrical winding 33C. The strip-shaped spacer 21 extends in the axial direction of the iron core 1 and is in close contact with the cylindrical winding 33 </ b> C and the cylinder 12 in the space between the cylindrical winding 33 </ b> C and the cylinder 12. The strip-shaped spacer 23 extends in the axial direction of the iron core 1, and is in close contact with the cylinder 13, the primary winding 2, and the core spacer 25 in the space between the cylinder 13 and the primary winding 2.

  The zigzag stopper 26 has an insulating property, extends in the radial direction around the iron core 1, and is provided in a space between the cylinder 13 and the cylinder 14. The zigzag stopper 26 is a member for changing the direction in which the insulating gas flows in the primary winding 2.

  The insulating block 27 is a member that has insulating properties and secures an insulating distance between the primary winding 2 and the secondary winding 33 and the iron core 1.

  The ring-shaped spacer 40 has insulating properties and is provided in a part of the space 60 between the cylinder 12 and the cylinder 13 in the axial direction of the iron core 1. More specifically, a plurality of ring-shaped spacers 40 are provided at intervals in the axial direction of the iron core 1.

  Further, the ring-shaped spacer 40 regulates the positions of the cylinder 12 and the cylinder 13 in the radial direction around the iron core 1. More specifically, the ring-shaped spacer 40 is in close contact with the cylinder 12 and the cylinder 13 in the space 60. By the ring-shaped spacer 40 and the strip-shaped spacers 20, 21, 23, 30, 31, the primary winding 2, the secondary winding 33, and the core spacer 25 are supported in the radial direction centering on the iron core 1. It has been.

  Further, the ring-shaped spacer 40 is disposed so as to overlap with the center-spaced spacer 25 in the radial direction centering on the iron core 1. With such a configuration, it is possible to increase the strength of the primary winding 2 and the secondary winding 33 with respect to the radial mechanical force centered on the iron core 1.

  The ring-shaped spacer 40 is disposed so as to inhibit the passage of the insulating gas 15 in the space 60. More specifically, the insulating gas 15 can flow into the space 60, but the ring spacer 40 is arranged so as to partition the space 60 on one side and the other side in the axial direction of the iron core 1. Yes. Thereby, the passage of the insulating gas 15 in the space 60 is inhibited.

  Since other configurations and operations are the same as those of the transformer according to the first embodiment, detailed description thereof will not be repeated here. Therefore, in the transformer according to the second embodiment of the present invention, it is possible to prevent a decrease in insulation and a decrease in cooling performance.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  1 Iron core, 2 Primary winding, 3, 33 Secondary winding, 4 Tank, 5 Radiator, 6 Gas blower, 7 Lower end frame, 8 Upper end frame, 9 Holding plate, 10 Gas stop plate, 11-14 Cylinder (Cylindrical member), 15 insulating gas, 20, 21, 23, 30, 31 strip spacer, 24, 25 center spacer, 26 zigzag stopper, 27 insulating block, 33A, 33B, 33C cylindrical winding, 40 ring shape Spacer, 60 spaces, 101, 102 Transformer.

Claims (8)

A transformer whose windings are cooled by insulating gas,
An axial iron core,
A secondary winding wound around the iron core;
A primary winding wound around the iron core on the outer peripheral side of the secondary winding;
A first cylindrical member having insulation and provided between the primary winding and the secondary winding;
A second cylindrical member having insulation, provided between the primary winding and the secondary winding, and provided on an outer peripheral side of the first cylindrical member;
A first spacer provided in a part of the space between the first tubular member and the second tubular member in the axial direction of the iron core, having insulation;
The first spacer regulates the positions of the first cylindrical member and the second cylindrical member in the radial direction around the iron core and inhibits the passage of the insulating gas in the space. A transformer that is arranged to be.   2. The transformer according to claim 1, wherein a plurality of the first spacers are provided at intervals in the axial direction of the iron core.   The transformer according to claim 1, wherein the first spacer has a ring shape and is in close contact with the first cylindrical member and the second cylindrical member. The insulating gas can flow into the space,
The first spacer includes
The transformer according to any one of claims 1 to 3, wherein the transformer is disposed so as to partition the space on one side and the other side in the axial direction of the iron core. The primary winding includes a plurality of disk-shaped windings wound and stacked on the iron core,
The transformer further comprises:
Having a second spacer provided between the plurality of windings adjacent to each other in the stacking direction.
The transformer according to any one of claims 1 to 4, wherein the first spacer is disposed so as to overlap the second spacer in a radial direction centered on the iron core. A flow path for the insulating gas is formed in a space inside the first tubular member;
The transformer according to any one of claims 1 to 5, wherein a flow path for the insulating gas is formed in a space outside the second cylindrical member. A transformer whose windings are cooled by insulating gas,
An axial iron core,
A secondary winding wound around the iron core;
A primary winding wound around the iron core on the outer peripheral side of the secondary winding;
A first cylindrical member having insulation and provided between the primary winding and the secondary winding;
A second cylindrical member having insulation, provided between the primary winding and the secondary winding, and provided on an outer peripheral side of the first cylindrical member;
A spacer having insulation and provided between the first tubular member and the second tubular member;
The spacer has a dielectric constant that is substantially the same as a dielectric constant of the insulating gas, and regulates the position of the first cylindrical member and the second cylindrical member in the radial direction about the iron core. And the transformer arrange | positioned so that passage of the said insulating gas in the space between the said 1st cylindrical member and the said 2nd cylindrical member may be inhibited.   The transformer according to claim 7, wherein a dielectric constant of the spacer is approximately one.

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