JP6851936B2 - Molded static induction device - Google Patents

Description

Embodiments of the present invention relate to a molded stationary induction device.

As shown in Patent Document 1, in order to enable higher voltage and larger capacity, the molded static induction device main body is placed in a closed container containing a cooling medium having a pressure exceeding atmospheric pressure. It is equipped with a heat exchanger that houses and cools the cooling medium, and a blower that circulates the cooling medium.

Japanese Unexamined Patent Publication No. 2015-225894

However, the molded static induction device cannot be efficiently cooled only by circulating the cooling medium. In addition, it is necessary to facilitate maintenance such as inspection and repair of the molded static induction device. Therefore, we provide a mold-type static induction device that improves cooling efficiency and is easy to maintain.

The mold-type static induction device according to the embodiment is configured to have an iron core housed in an airtight container, a plurality of windings mounted on the outer periphery of the iron core, and air blown to the windings. A first blower and a guide plate provided at the lower part of the winding and fixed to a guide plate support fixed to the inner wall of the container via a cushioning material are provided, and the guide plate is the winding. It is arranged at a position in contact with the lower end surface of the wire and has an opening, the first blower is arranged directly under the opening, and a flow path in the winding is provided inside the winding, and the opening is provided. The portion is a window portion having an outer diameter larger than the outer diameter of the winding, and the container is divided into a lower chamber and an upper chamber by the guide plate, and an upper continuous passage connected to the upper chamber and a passageway connected to the upper chamber. Further, a cooler connected via a lower communication passage connected to the lower chamber and a second blower arranged in the lower communication passage and capable of blowing air toward the lower chamber are further provided. Circulation path of the cooling medium that circulates and flows back to the lower chamber through the lower chamber, the flow path in the winding, the upper chamber, the upper passage, the cooler, and the lower passage by the first and second blowers. Is formed. The opening is composed of a substantially circular window portion and an annular slit portion formed concentrically with respect to the window portion, and the slit portion is directly below the flow path in the winding. It is arranged corresponding to the position of the flow path in the winding, and the slit portion on the outermost circumference is arranged so as to be located outside the outer peripheral wall of the winding.

A vertical sectional view showing a schematic configuration of a mold-type stationary induction device according to the first embodiment. Longitudinal sectional view showing a schematic configuration of a molded stationary induction device Cross-sectional view showing a schematic configuration of a molded stationary induction device Top view showing the schematic configuration of the guide plate The plan view which shows the schematic structure of the guide plate which concerns on 2nd Embodiment. Top view showing the configuration of the mold-type stationary guidance device according to the third embodiment. Top view showing the configuration of the mold-type static guidance device according to the fourth embodiment. Top view showing the configuration of the mold-type stationary guidance device according to the fifth embodiment.

Hereinafter, embodiments will be described with reference to the drawings. In the description of the embodiment, substantially the same constituent parts are designated by the same reference numerals, and the description thereof will be omitted. Further, in the following description and drawing, the vertical direction means the vertical direction when the transformer 1 is installed, and the axial direction of the iron core 10 and the winding 12 is the vertical direction.

(First Embodiment)
1 to 4 are diagrams showing a schematic configuration of a transformer 1 shown as an example of a molded static induction device according to the first embodiment. FIG. 1 is a vertical cross-sectional view showing a schematic configuration of a transformer 1, and shows a vertical cross-sectional view taken along the line EE of FIG. FIG. 2 is a cross-sectional view showing a schematic configuration of the transformer 1 on the BB line, CC line, or DD line of FIG. 1, and also shows the schematic configuration of the cooler 16. FIG. 3 is a cross-sectional view showing a schematic configuration of the transformer 1 on the line AA of FIG.

As shown in FIGS. 1 and 2, the transformer 1 includes an iron core 10 and a winding 12 wound around the outer circumference of the iron core 10 and mounted. These iron cores 10, windings 12, and the like are housed inside the container 2 which is the housing of the transformer 1. The container 2 is configured to keep the inside airtight. The inside of the container 2 is filled with an insulating cooling medium such as an insulating gas. In this embodiment, the cooling medium is air (gas).

The iron core 10 is provided with an upper yoke 10a at the upper part and a lower yoke 10b at the lower part. The iron core 10 is clamped and fixed at the upper yoke 10a and the lower yoke 10b by clamps (not shown). The winding 12 is fixed from above and below by a winding retainer (not shown).

The winding 12 has a cylindrical shape as a whole, and an in-winding flow path 13 penetrating in the vertical direction is provided inside the winding 12. The flow path 13 in the winding is a gap formed in the winding 12 in the axial direction of the winding 12 and concentrically with respect to the central axis of the winding 12. A cooling medium can be circulated in the flow path 13 in the winding. The winding 12 can be cooled from the inside by the cooling medium flowing through the flow path 13 in the winding. A spacer (not shown) may be provided in the flow path 13 in the winding to maintain the gap.

As shown in FIG. 3, the winding 12 has a circular shape in the cross section. At the center of the winding 12, a circular hollow portion 12c has a cross section, and an iron core 10 is arranged in the hollow portion 12c. In the winding 12 illustrated in FIG. 3, the in-winding flow path 13 is provided in three layers concentrically with the cavity portion 12c. The shape of the winding 12 is not limited to the above shape, and the shape of the cross section is a rectangle with rounded corners, and is a square column shape having a cavity in the center or a shape of the cross section. Is an ellipse, and may have a cylindrical shape having a hollow portion in the center.

As shown in FIGS. 1 to 4, the guide plate 6 is provided at the lower part of the winding 12. The guide plate 6 is fixed to the guide plate support 4 fixed to the side surface of the inner wall of the container 2 via the cushion material 5. The guide plate support 4 is a rectangular frame-shaped flat plate having an opening at the center, and is made of, for example, iron. The guide plate support 4 is fixed to the inner wall side surface of the container 2 by welding, for example, and is airtightly fixed to the inner wall side surface of the container 2. The cushion material 5 is a member having a rectangular frame shape and a flat plate shape, and is formed of, for example, an elastic body. The guide plate 6 is made of an insulating material. The cushion material 5 fills the gap between the guide plate support 4 and the guide plate 6 by filling the gap between the guide plate support 4 and the guide plate 6, and the cooling medium is used from the gap between the guide plate support 4 and the guide plate 6. It has a function to prevent leakage. As a result, the container 2, the guide plate support 4, the cushion material 5, and the guide plate 6 are airtightly configured. Hereinafter, among the containers 2, the lower portion of the guide plate 6 is referred to as a lower chamber 2a, and the upper portion of the guide plate 6 is referred to as an upper chamber 2b. The container 2 is divided into a lower chamber 2a and an upper chamber 2b by a guide plate 6.

As shown in FIG. 2, the transformer 1 is a cooler connected via an upper passage 18 provided in the upper chamber 2b of the container 2 and a lower passage 20 provided in the lower chamber 2a of the container 2. It has 16. The cooler 16 is a heat exchanger and has a function of cooling the cooling medium enclosed in the cooler 16. The upper communication passage 18 and the lower communication passage 20 allow the cooling medium in the container 2 to communicate with the cooler 16. The cooling medium heated in the winding 12 passes through the upper passage 18 from the upper chamber 2b and enters the cooler 16, and after being cooled by the cooler 16, the cooling medium immediately after cooling passes through the lower passage 20. Then, it flows into the lower chamber 2a of the container 2. A blower 22 is provided in the lower passage 20. The blower 22 makes it possible to efficiently blow and transport the cooling medium in the cooler 16 to the lower chamber 2a. The inside of the container 2 and the cooler 16 connected to the container 2 via the upper passage 18 and the lower passage 20 is airtightly configured. The cooling medium is sealed in the container 2 and the cooler 16 at a pressure exceeding atmospheric pressure. Cooling performance can be improved by increasing the pressure of the cooling medium enclosed inside. Moreover, air is used as a cooling medium. This facilitates operations such as decompression in the container 2, intrusion into the container 2, and refilling of the cooling medium during maintenance of the transformer 1. Therefore, maintenance work such as inspection and repair of the transformer 1 becomes easy.

As shown in FIGS. 3 and 4, the guide plate 6 is a rectangular flat plate-shaped member. The outer circumference of the guide plate 6 is configured to overlap the inner edge portion of the guide plate support 4, and the guide plate support 4 and the guide plate 6 are connected by narrowly squeezing the cushion material 5 in the overlapping portion. .. The guide plate 6 is provided with an opening 6a configured corresponding to the shape of the winding 12 so as to correspond to a position directly below the winding 12, in this case, an opening 6a which is a substantially circular window portion. Has been done. In the installed state of the transformer 1, the iron core 10 penetrates through the opening 6a. The size of the opening 6a is configured to be slightly larger than the outer diameter of the winding 12 so that the cooling medium can also flow through the outer wall of the winding 12. The container 2, the guide plate support 4, the cushion material 5, and the guide plate 6 are airtightly configured except for the opening 6a, and are between the container 2 and the guide plate support 4, the cushion material 5, and the guide plate 6. Is configured so that there is no gas leakage.

As shown in FIGS. 1 and 2, the blower 14 is arranged so as to be located directly below the winding 12. That is, the blower 14 is arranged so as to be located directly below the opening 6a of the guide plate 6. The blower 14 is arranged in the lower part of the container 2, that is, in the lower chamber 2a. The blower 14 moves the cooling medium immediately after being cooled by the cooler 16 from the bottom to the top. The opening 6a, the winding 12, and the flow path in the winding 13 are located directly above the blower 14. The cooling medium is blown directly upward by the blower 14, passes through the opening 6a of the guide plate 6, and blows mainly through the inner flow path 13 of the winding, the inner side wall 12a of the winding 12, and the outer wall 12b. Will be done. In this way, the flow of the cooling medium created by the blower 14 is directed by the opening 6a so as to efficiently proceed in the direction of the winding 12, and the inner flow path 13 of the winding, the inner side wall 12a of the winding 12, and the outer side. It passes through the wall 12b. The blowers 14 shown in FIGS. 1 and 2 appear to be arranged only in the left-right, front-back, and front-rear directions of the iron core 10 due to the cross-sectional position, but they may be arranged in positions not shown in the cross-section. .. That is, the blowers 14 may be arranged as many as the installation location allows.

Further, the guide plate 6 provided with the opening 6a as described above and the blower 14 provided directly under the opening 6a can concentrate the flow of the cooling medium generated by the blower 14 in the winding 12 direction. it can. That is, since the cooling medium can be concentrated in the winding inner flow path 13, the inner side wall 12a of the winding 12 (that is, the gap between the winding 12 and the iron core 10), and the outer wall 12b, the winding can be blown. 12 can be cooled efficiently.

Further, the blower 14 and the blower 22 provide a route such as lower chamber 2a → winding 12, that is, in-winding passage 13 → upper chamber 2b → upper communication passage 18 → cooler 16 → lower communication passage 20 → lower chamber 2a. A circulation path of the cooling medium that circulates and flows is formed.

According to the stationary guidance device of the first embodiment, the following effects are obtained.
A guide plate 6 having an opening 6a provided so as to be located below the winding 12 and a blower 14 are arranged so as to be located below the opening 6a, preferably directly below. The blower 14 blows the cooling medium upward, that is, in the winding 12 direction. Further, the winding 12 is provided with an in-winding flow path 13, and the cooling medium passes through the in-winding flow path 13. The opening 6a is configured to open slightly larger than the outer diameter of the winding 12. With this configuration, it is possible to blow the cooling medium in the direction of the inner flow path 13 of the winding 12, the inner side wall 12a of the winding 12, and the outer wall 12b, so that the cooling efficiency of the winding 12 can be improved. Can be improved.

Further, the container 2 is divided into a lower chamber 2a and an upper chamber 2b by a guide plate 6 and separated from each other. A cooling medium cooled by the cooler 16 is blown into the lower chamber 2a, and the cooled cooling medium can be blown in the winding 12 direction by the blower 14. The cooling medium warmed by cooling the winding 12 is blown to the upper chamber 2b. The cooling medium of the upper chamber 2b is sent to the cooler 16 via the upper passage 18, and is cooled by the cooler 16. With this configuration, the cooling medium immediately after being cooled does not mix with the cooling medium warmed by the winding 12. Therefore, since the cooling medium having a low temperature can be efficiently blown to the winding 12, the cooling efficiency of the winding 12 can be improved.

Further, a blower 22 is provided in the lower passage 20 communicating with the lower chamber 2a of the container 2. As a result, the cooling medium immediately after being cooled by the cooler 16 can be efficiently blown to the lower chamber 2a. Further, the lower chamber 2a is provided with a plurality of blowers 14 in which the blowing direction is set upward, that is, in the winding 12 direction. As a result, the cooling medium cooled by the cooler 16 is blown to the lower chamber 2a by the blower 22, and the cooled cooling medium is blown by the blower 14 in the winding 12 direction, that is, in the winding flow path 13 and inside the winding 12. The air is intensively blown in the direction of the wall 12a and the outer wall 12b. In this way, the cooling immediately after being cooled by the blower 22 that blows the cooling medium cooled by the cooler 16 to the lower chamber 2a and the blower 14 that is arranged in the lower chamber 2a and blows the cooling medium in the winding 12 direction. Since the medium can be efficiently blown in the direction of the winding 12 to be cooled, the winding 12 can be cooled efficiently. Therefore, the cooling efficiency of the winding 12 can be improved. In this case, if a plurality of lower communication passages 20 and blowers 22 are provided, the cooling efficiency of the winding 12 can be further improved. Further, since the blower 14 and the blower 22 promote the circulation of the cooling medium, the cooling efficiency of the winding 12 can be improved.

Further, the guide plate 6 is fixed to the guide plate support 4 fixed to the inner wall of the container 2 via the cushion material 5. In this case, the cushion material 5 has a function of filling the gap between the guide plate support 4 and the guide plate 6 to prevent the cooling medium from leaking from between the guide plate support 4 and the guide plate 6. With this configuration, the cooling medium immediately after cooling, which is blown from the cooler 16 to the lower chamber 2a and transported, does not leak out, and the loss of the cooling medium immediately after cooling blown in the winding 12 direction is suppressed. be able to. Therefore, it is possible to suppress a decrease in the cooling efficiency of the winding 12.

Further, the cooling medium has a low density when the temperature is high, and a high density when the temperature is low. Therefore, even when the blower 14 and the blower 22 are stopped, convection occurs due to the density difference due to the temperature of the cooling medium cooled by the cooler 16, so that the cooling medium circulates in the above circulation path. As a result, even when the blower 14 and the blower 22 are stopped, the winding 12 is cooled by the convection generated by the cooler 16. Further, also in this case, since the cooling medium flows intensively in the direction of the winding 12 located directly above the opening 6a, the cooling medium is concentrated on the inner flow path 13, the inner side wall 12a, and the outer wall 12b. Can be blown to. Therefore, it is possible to improve the cooling efficiency of the winding 12 even when the blower 14 and the blower 22 are stopped.

(Second Embodiment)
Next, the second embodiment will be described. FIG. 5 is a plan view showing a schematic configuration of a modified example of the guide plate 6. In the second embodiment, the guide plate 6 located directly below the winding 12 is provided with a slit portion 70 facing the inner flow path 13 of the winding and the outer wall 12b.

As shown in FIG. 5, the guide plate 60 is a flat plate having a rectangular shape as a whole. The guide plate 60 includes an opening 61 which is a circular window portion, and a plurality of slit portions 70 arranged concentrically with the opening 61. The slit portion 70 is arranged in four fan-shaped regions having an angle range of, for example, about 90 degrees. The slit portions 70 are arranged in the order of the slit portions 71, 72, 73, 74 from the side closest to the opening 61. The slit portions 70 are arranged so as to be adjacent to each other in the circumferential direction via the bridge portion 8 provided in the boundary region of the fan-shaped region. The slit portions 70 are arranged concentrically, and form four annular slits divided by the bridge portion 8.

With the guide plate 60 installed on the transformer 1, the guide plate 60 is arranged directly below the winding 12. In this case, the opening 61 has an inner diameter sufficient to allow the iron core 10 to penetrate, and the opening 61 is installed so as to penetrate the iron core 10. Further, in this case, the three slit portions 71, 72, and 73 from the inside are arranged at positions directly below each in-winding flow path 13 of the winding 12, corresponding to the arrangement of the in-winding path 13. The outermost slit portion 74 is arranged so as to be located slightly outside the outer wall 12b of the winding 12.

Since the blower 14 is arranged below the guide plate 60 and the cooling medium is blown upward by the blower 14, the cooling medium blown by the blower 14 is a slit located directly below the flow path 13 in the winding. It passes through the portion 70 and is intensively blown in the direction of the flow path 13 in the winding and the outer wall 12b. Further, the cooling medium that has passed through the opening 61 is blown to the inner side wall 12a of the winding 12 by passing through the gap between the iron core 10 and the inner side wall 12a of the winding 12, and is transported.

Other configurations are the same as those of the transformer 1 according to the first embodiment.
According to the transformer 1 using the guide plate 60 according to the second embodiment, the same effect as that of the first embodiment is obtained, and the following effects are obtained.

The slit portions 70 (71, 72, 73, 74) provided in the guide plate 60 are formed in the winding inner flow path 13 and the outer wall 12b of the winding 12 in a state where the guide plate 60 is installed in the transformer 1. It is configured to be directly below. Further, the opening 61 is arranged at a position directly below the gap between the iron core 10 and the inner side wall 12a. Therefore, as a result of the cooling medium being blown upward by the blower 14, the cooling medium is intensively blown and transported toward the winding inner flow path 13, the inner side wall 12a, and the outer wall 12b of the winding 12. In this way, the cooling medium immediately after cooling in the lower chamber 2a of the container 2 is concentrated and blown in the direction of the winding 12, that is, in the direction of the winding inner flow path 13, the inner side wall 12a of the winding 12, and the outer wall 12b. Therefore, the cooling efficiency of the winding 12 can be improved.

Further, according to this configuration, the cooling medium that has passed through the slit portion 70 and the opening 61 of the guide plate 60 is not blown toward the bottom portion of the winding 12. Therefore, since the cooling medium sent by the blower 14 does not flow toward the structure that obstructs the flow of the cooling medium, the blowing efficiency does not decrease. Therefore, the cooling efficiency of the winding 12 can be improved.

(Third Embodiment)
Next, the third embodiment will be described with reference to FIG. FIG. 6 is a view of the winding winding 25 facing from above, and shows the blowers 26 (26a, 26b) arranged below the winding 25 in a see-through state from above. The winding 25 in the third embodiment has a hollow portion 25c in the central portion and has a substantially quadrangular shape (approximately rectangular shape) with rounded corners when viewed from above. And a region G which is a corner portion. Of the short side F, the region between the regions G is referred to as the region H, and the region between the regions G on the long side is referred to as the region J. The winding 25 includes an inner side wall 25a and an outer wall 25b, similarly to the winding 12 described above. Further, in FIG. 6, the flow path 13 in the winding is omitted, but it actually exists. Others are the same as those of the first and second embodiments.

The substantially rectangular winding 25 has a property that heat generation on the short side F is large during operation of the transformer 1 provided with the winding 25. Further, the short side F of the substantially rectangular winding 25 has a property that heat is generated particularly in a region G which is a corner portion. The heat generated in the region J is not larger than that in the region G and the region H on the short side F.

Therefore, first, the blower 26a is arranged in the region G. By arranging the blower 26a in the region G, it is possible to blow air toward the region G having the largest heat generation and the highest temperature in the winding 25, so that the cooling efficiency can be improved.

Further, the blower 26b is arranged in the area H. By arranging the blower 26b in the region H, it is possible to blow air toward the region H in which the winding 25 has the second largest heat generation and the highest temperature next to the region G, so that the cooling efficiency can be improved.

Therefore, it is desirable to preferentially arrange the blowers 26 in the order of region G, region H, and region J. The blower 26 may be arranged in the area J.
The configuration according to the third embodiment obtains the same effects as those of the first and second embodiments. Further, according to the configuration according to the third embodiment, the cooling efficiency of the winding 12 can be further improved.

(Fourth Embodiment)
Next, the fourth embodiment will be described with reference to FIG. 7. FIG. 7 is a view of the winding 27 facing from above, and shows the blower 26 arranged below the winding 27 in a state of being seen through from above. The winding 27 in the fourth embodiment has an elliptical shape having a major axis and a minor axis when viewed from above, and has regions K at two ends in the major axis direction. The area between the areas K is defined as the area L. The winding 27 includes an inner side wall 27a and an outer wall 27b. Further, in FIG. 7, the flow path 13 in the winding is omitted, but it actually exists. Other configurations are the same as those in the first to third embodiments.

In this elliptical winding 27, when the transformer 1 provided with the winding 27 is operated, the region K, which is the end region in the long side direction, generates a large amount of heat. The heat generation in the region L is not larger than that in the region K.

Therefore, first, the blower 26 is arranged in the area K. By arranging the blower 26 in the region K, it is possible to blow air toward the region K having the largest heat generation and the highest temperature in the winding 27, so that the cooling efficiency can be improved.

Therefore, as for the arrangement of the blower 26, it is desirable to preferentially arrange the area K and the area L in this order. The blower 26 may be arranged in the area L.
With the configuration according to the fourth embodiment, the same effect as that of the first to third embodiments can be obtained. Further, according to the configuration according to the fourth embodiment, the cooling efficiency of the winding 27 can be further improved.

(Fifth Embodiment)
Next, the fifth embodiment will be described with reference to FIG. FIG. 8 is a view of the transformer main body of the three-phase transformer 1 composed of the three windings 25 facing from above, and shows the blower 26 arranged below the windings 25 in a see-through state from above. ing.

FIG. 8 illustrates an example in which three windings 25 illustrated in the third embodiment, that is, three windings 25 having a substantially rectangular shape (substantially rectangular shape) having rounded corners are arranged to form a three-phase transformer 1. ing. Other configurations of the winding 25 are the same as those in the third embodiment. Three of these windings 25 are arranged side by side so as to face the region J which is the long side portion, and the iron core 10 is arranged so as to penetrate through the central cavity portion 25c.

In the transformer 1 according to the fifth embodiment, the blower 26 is arranged in the region G and the region H on the short side F in FIG. 6, as in the third embodiment. Further, in the fifth embodiment, a blower 28 for blowing the cooling medium between the windings 30 is further provided. The blower 28 is arranged at a desired position between the windings 30. For example, the blower 28 is arranged from the side toward the winding interval 30 in the diagonally upward direction. As a result, the blower 28 is configured to be able to blow the cooling medium in the direction of 30 between the windings as shown by the arrow 29. Although the blower 28 is arranged at a position where the windings 30 are sandwiched from both sides, one of the blowers 28 may be arranged.

Here, the blower 28 does not necessarily have to be arranged below the winding 25. Further, in the fifth embodiment, the guide plate 6 is not always necessary. Even without the guide plate 6, the cooling efficiency of the winding 25 can be improved by the blower 26 arranged below the winding 25 and the blower 28 arranged so as to blow air between the windings 30.

Although the first embodiment and the second embodiment have been described above, the following modifications can be made.
In the first and second embodiments, the transformer 1 has been illustrated and described as a molded static induction device, but the present invention is not limited thereto. For example, it may be applied to a reactor. Further, the winding 12 exemplifies a configuration including three internal flow paths 13 in the winding, but the winding 12 is not limited thereto. The in-winding flow path 13 may be one, or may be a winding 12 including more in-winding flow paths 13.

As described above, some embodiments of the present invention have been described, but these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other embodiments, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are also included in the scope of the invention described in the claims and the equivalent scope thereof.

1 ... Transformer, 2 ... Container, 2a ... Lower chamber, 2b ... Upper chamber, 4 ... Guide plate support, 5 ... Cushion material, 6, 60 ... Guide plate, 6a, 61 ... Opening, 70, 71, 72, 73, 74 ... Slit part, 8 ... Bridge part, 10 ... Iron core, 12, 25, 27, 30 ... Winding, 12a, 25a, 27a ... Inner side wall, 12b, 25b, 27b ... Outer wall, 12c, 25c ... Cavity Part, 13 ... In-winding passage, 14, 22, 26, 26a, 26b, 28 ... Blower, 16 ... Cooler, 18 ... Upper passage, 20 ... Lower passage

Claims (3)

Stored in an airtight container,
With the iron core
A plurality of windings mounted on the outer circumference of the iron core,
A first blower configured to blow air in the winding direction and
A guide plate provided at the lower part of the winding and fixed to the inner wall of the container with a guide plate via a cushion material is provided.
The guide plate is arranged at a position in contact with the lower end surface of the winding and has an opening.
The first blower is arranged directly below the opening.
A flow path inside the winding is provided inside the winding.
The opening is a window having an outer diameter larger than the outer diameter of the winding.
The container is divided into a lower chamber and an upper chamber by the guide plate.
An upper passageway connected to the upper chamber and a cooler connected via a lower passageway connected to the lower chamber.
A second blower arranged in the lower passageway and capable of blowing air toward the lower chamber is further provided.
A cooling medium that circulates and flows back to the lower chamber through the lower chamber, the flow path in the winding, the upper chamber, the upper passage, the cooler, and the lower passage by the first and second blowers. A circulation path is formed ,
The opening is composed of a substantially circular window portion and an annular slit portion formed concentrically with respect to the window portion.
The slit portion is arranged directly below the flow path in the winding, corresponding to the position of the flow path in the winding.
The outermost slit portion is a mold-type stationary induction device arranged so as to be located outside the outer peripheral wall of the winding. The supporting guide plate, wherein the cushion member, and the guide plate, the is airtight except for the opening, mold stationary induction apparatus according to claim 1, wherein. The mold-type static induction device according to claim 1 or 2 , wherein air having a pressure exceeding atmospheric pressure is sealed in the container.

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