JPH07263248A - Gas-cooled electric power machine - Google Patents

Abstract

PURPOSE:To enhance the cooling efficiency while keeping insulation between the coils and to make uniform the temperature distribution by increasing the interval for disposing a flow deflecting member on the gas flow-in side of inner and outer vertical gas channel. CONSTITUTION:Inner and outer vertical gas channels 5, 4 are provided between coils 3 and inner and outer insulating tubes 1, 2. The vertical gas channels 4, 5 are provided with a plurality of flow deflecting members 8 for deflecting an insulating gas flow, fed from a gas intake port 7, from vertical direction to horizontal direction toward a horizontal gas channel 6. When the interval of the flow deflecting member 8 is increased on the gas flow-in side, the insulating gas flow reaches the upper part while storing small quantity of heat thus cooling an upper coil 3 efficiently. Since the dimensions of the horizontal gas channel 6 are not required to be decreased toward the upper part, temperature distribution at the coil containing part can be made uniform without sacrifice of insulation between the coils 3 and thereby local temperature rise can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power device such as a transformer or a current transformer, and particularly to a gas for cooling a coil for energization with an insulating gas such as SF ₆ gas in order to prevent the coil from overheating. The present invention relates to a cooling type power device.

[0002]

2. Description of the Related Art Generally, in a power device such as a transformer or a current transformer, a large current is passed through the coil, which may cause the coil to overheat and damage the coil. Therefore, as one means for solving the above-mentioned problem, there is known a power device in which the coil is cooled by an insulating gas such as SF ₆ gas to prevent the coil from overheating.

Conventionally, in this type of electric power equipment, as shown in FIG. 7, a plurality of coils 3 are stacked and housed in a coil housing portion formed between an outer insulating cylinder 1 and an inner insulating cylinder 2.
SF ₆ gas or the like is supplied to the outer vertical gas passage 4 and the inner vertical gas passage 5 formed between the coil 3 and the outer insulating cylinder 1 and the inner insulating cylinder 2 and the horizontal gas passage 6 formed between the respective coils 3. The insulating gas is flowed to cool the coil 3.

In the electric power equipment having such a structure, most of the insulating gas flowing from the gas inlet 7 into the coil housing portion flows through the outer vertical gas passage 4 and the inner vertical gas passage 5 as shown by the arrows in the figure. Since the proportion of the insulating gas flowing into the horizontal gas passage 6 is small, a local temperature rise of the coil 3 is likely to occur in the central portion of the coil housing portion. Therefore, in the conventional gas-cooled power equipment, as shown in FIG. 8, the diverting members 8 are alternately provided on the outer vertical gas passages 4 and the inner vertical gas passages 5, and the insulating gas is isolated by these diverting members 8. The insulating gas is caused to flow in the horizontal gas passage 6 by changing the flow of the gas from the vertical direction to the horizontal direction as shown by the arrow in the figure.

[0005]

However, in the conventional gas-cooled power equipment shown in FIG. 8, the flow velocity of the insulating gas flowing through the horizontal gas passage 6 is divided by the flow diverting member 8 as shown in FIG. Since it becomes slower on the upstream side of the divided section and becomes faster on the downstream side of the section divided by the flow diverting member 8 (hereinafter, referred to as “flow fold section”), the coil 3 becomes supercooled on the upstream side of the fold flow section. On the contrary, there arises a problem that the coil 3 is insufficiently cooled on the downstream side of the folded flow section.

In order to solve such a problem, the dimension t (see FIG. 8) of the horizontal gas passage 6 is gradually reduced toward the gas discharge side (upper part in the figure) of the coil housing portion, and the solid line in FIG. It is known that the flow velocity of the insulating gas flowing in the horizontal gas passage 6 is made uniform in the diverting section as shown in FIG. However, since the line terminals of the transformer and the reactor are often provided at the upper end of the coil accommodating portion, it is necessary to gradually reduce the size of the horizontal gas passage 6 toward the upper part of the coil accommodating portion for insulation reasons. Not preferable. In addition, since the heat generated in the coil 3 is accumulated in the insulating gas, the insulating gas on the gas exhaust side (upper part in the drawing) of the coil housing part is more likely to be on the insulating gas side than the gas inflow side (lower part in the drawing) of the coil housing part. There is a problem that the temperature rises and the cooling performance deteriorates on the gas discharge side of the coil housing portion.

The present invention has been made in view of the above-mentioned circumstances, and an object thereof is to provide a gas-cooled power device which has a high cooling efficiency of a current-carrying coil, a uniform temperature distribution, and is advantageous in terms of insulation. It is what

[0008]

In order to solve the above-mentioned problems, in the invention according to claim 1, the installation intervals of the flow diverting members are increased on the gas inflow side of the outer vertical gas passage and the inner vertical gas passage. It is characterized by.

According to the second aspect of the present invention, the installation intervals of the flow diverting members are increased on the gas inflow side of the outer vertical gas passage and the inner vertical gas passage, and the central vertical gas passage is provided in the lower portion of the coil accommodating portion. It is characterized by that.

The invention according to claim 3 is characterized in that the interval between the flow diverting members is gradually reduced toward the gas discharge side of the outer vertical gas passage and the inner vertical gas passage.

Further, the invention according to claim 4 is characterized in that a narrow passage member for narrowing the flow passage cross-sectional area of the outer vertical gas passage or the inner vertical gas passage is provided in the straight flow section divided by the straight flow member. To do.

Further, the invention according to claim 5 is characterized in that the flow passage cross-sectional area of the outer vertical gas passage or the inner vertical gas passage is narrowed toward the gas discharge side of the coil accommodating portion. Further, the invention according to claim 6 is characterized in that the flow passage cross-sectional areas of the outer vertical gas passages or the inner vertical gas passages are alternately narrowed.

[0013]

In the invention according to claim 1, the insulating gas in which the heat generated by the coil is not much accumulated flows into the coil discharge portion on the gas discharge side. In the invention according to claim 2, the insulating gas in which the heat generated in the coil is not much accumulated flows into the gas discharge side of the coil housing portion, and the coil housed in the gas inlet side of the coil housing portion is vertically outside. Gas path,
It is cooled by an insulating gas flowing through the inner vertical gas passage and the central vertical gas passage.

According to the third aspect of the invention, the insulating gas in which the heat generated in the coil is not much accumulated flows into the coil housing portion on the gas discharge side. In the invention according to claim 4,
The gas flow rate to the horizontal gas passage on the lower side in the mixed flow section is increased, and the coil on the lower side in the mixed flow section is effectively cooled.

In the invention according to claim 5, a pressure difference is generated between the outside and the inside of the horizontal gas passage, and the insulating gas flows into the horizontal gas passage from the outer vertical gas passage side toward the inner vertical gas passage side. In the invention according to claim 6, the flow of the insulating gas changes from the vertical direction to the horizontal direction at the portions where the flow passage cross-sectional areas of the outer vertical gas passage and the inner vertical gas passage are narrowed, and is formed between the coils. Insulating gas flows into the horizontal gas passage.

[0016]

1 is a longitudinal sectional view showing the structure of a coil housing portion of a gas-cooled power device according to a first embodiment of the present invention. In the figure, 1 is an outer insulating cylinder, 2 is an inner insulating cylinder arranged inside the outer insulating cylinder 1, and 3 is an outer insulating cylinder 1 and an inner insulating cylinder 2.
And a plurality of coils housed in a coil housing formed between the coil 3 and the outer insulating cylinder 1 and the inner insulating cylinder 2 and the outer vertical gas passage 4 and the inner vertical gas. Road 5 is formed. In the figure, 6 is a horizontal gas passage formed between the coils 3, and 7 is a gas inlet provided in the lower part of the coil housing portion. The gas flows into the horizontal gas passage 6 by changing the flow direction from the vertical direction to the horizontal direction by a plurality of the flow dividing members 8. The flow dividing member 8 is provided in the outer vertical gas passage 4 and the inner vertical gas passage 5. They are provided alternately, and the installation intervals are large on the gas inflow side (the lower part in the figure) of the outer vertical gas passage 4 and the inner vertical gas passage 5.

As described above, if the spacing between the flow diverting members 8 is increased on the gas inflow side of the outer vertical gas passage 4 and the inner vertical gas passage 5, the insulating gas flowing from the gas intake port 7 to the lower portion of the coil housing portion is removed. Most of them flow through the outer vertical gas passage 4 and the inner vertical gas passage 5 and flow into the upper part of the coil housing. At this time, since the heat generated in the coil 3 is not accumulated much in the insulating gas flowing into the upper part of the coil housing part, the coil 3 housed in the upper part of the coil housing part is efficiently cooled by the insulating gas. You can As a result, the temperature distribution in the coil accommodating portion becomes uniform, and it is possible to prevent a local temperature increase of the coil 3 that occurs in the upper portion of the coil accommodating portion. Further, since it is not necessary to reduce the size of the horizontal gas passage 6 toward the upper part of the coil housing portion, it is advantageous in terms of insulation.

FIG. 2 is a vertical cross-sectional view showing the structure of the coil accommodating portion of the gas-cooled power equipment according to the second embodiment of the present invention. In the figure, 1 is an outer insulating cylinder, 2 is an inner insulating cylinder arranged inside the outer insulating cylinder 1, and 3 is stacked and accommodated in a coil accommodating portion formed between the outer insulating cylinder 1 and the inner insulating cylinder 2. The outer vertical gas passage 4 and the inner vertical gas passage 5 are formed between the coils 3 and the outer insulating cylinder 1 and the inner insulating cylinder 2. In the figure, 6 is a horizontal gas passage formed between the coils 3, and 7 is a gas inlet provided in the lower part of the coil housing portion. The gas flows into the horizontal gas passage 6 by changing the flow direction from the vertical direction to the horizontal direction by a plurality of the flow dividing members 8. The flow dividing member 8 is provided in the outer vertical gas passage 4 and the inner vertical gas passage 5. They are installed alternately, and the installation interval is the outer vertical gas passage 4
And on the gas inflow side of the inner vertical gas passage 5 (lower part in the figure). A central vertical gas passage 9 is formed in the lower part of the coil housing portion formed between the outer insulating cylinder 1 and the inner insulating cylinder 2.

As described above, the spacing between the flow diverting members 8 is increased on the gas inflow side of the outer vertical gas passage 4 and the inner vertical gas passage 5, and the central vertical gas passage 9 is provided below the coil housing.
By providing, most of the insulating gas flowing from the gas inlet 7 to the lower portion of the coil housing portion flows through the outer vertical gas passage 4, the inner vertical gas passage 5 and the central vertical gas passage 9 and the upper portion of the coil housing portion. Flow into. At this time, since the heat generated in the coil 3 is not accumulated much in the insulating gas flowing into the upper part of the coil housing part, the coil 3 housed in the upper part of the coil housing part is efficiently cooled by the insulating gas. You can As a result, the temperature distribution in the coil accommodating portion becomes uniform, and it is possible to prevent a local temperature increase of the coil 3 that occurs in the upper portion of the coil accommodating portion. Further, since it is not necessary to reduce the size of the horizontal gas passage 6 toward the upper part of the coil housing portion, it is advantageous in terms of insulation. Further, since the coil 3 accommodated in the lower portion of the coil accommodating portion is cooled by the insulating gas flowing through the outer vertical gas passage 4, the inner vertical gas passage 5, and the central vertical gas passage 9, the coil 3 is cooled in the lower central portion of the coil accommodating portion. It is also possible to prevent a local temperature rise of the coil 3 that occurs.

FIG. 3 is a vertical cross-sectional view showing the structure of the coil housing portion of the gas-cooled power equipment according to the third embodiment of the present invention. In the figure, 1 is an outer insulating cylinder, 2 is an inner insulating cylinder arranged inside the outer insulating cylinder 1, and 3 is stacked and accommodated in a coil accommodating portion formed between the outer insulating cylinder 1 and the inner insulating cylinder 2. The outer vertical gas passage 4 and the inner vertical gas passage 5 are formed between the coils 3 and the outer insulating cylinder 1 and the inner insulating cylinder 2. In the figure, 6 is a horizontal gas passage formed between the coils 3, and 7 is a gas inlet provided in the lower part of the coil housing portion. The gas flows into the horizontal gas passage 6 by changing the flow direction from the vertical direction to the horizontal direction by a plurality of the flow dividing members 8. The flow dividing member 8 is provided in the outer vertical gas passage 4 and the inner vertical gas passage 5. They are installed alternately, and the installation interval is the outer vertical gas passage 4
And the inner vertical gas passage 5 becomes smaller as it gets closer to the gas discharge side (upper part in the figure).

As described above, when the interval between the flow diverting members 8 is gradually reduced toward the gas discharge side of the outer vertical gas passage 4 and the inner vertical gas passage 5, the gas flows from the gas inlet 7 into the lower portion of the coil accommodating portion. Most of the insulating gas is the outer vertical gas passage 4
And through the inner vertical gas passage 5 to flow into the upper part of the coil housing. At this time, since the heat generated in the coil 3 is not accumulated much in the insulating gas flowing into the upper part of the coil housing part, the coil 3 housed in the upper part of the coil housing part is efficiently cooled by the insulating gas. You can As a result, the temperature distribution in the coil accommodating portion becomes uniform, and it is possible to prevent a local temperature increase of the coil 3 that occurs in the upper portion of the coil accommodating portion. Further, since it is not necessary to reduce the size of the horizontal gas passage 6 toward the upper part of the coil housing portion, it is advantageous in terms of insulation. Furthermore, since the installation intervals of the flow diverting members 8 are smaller in the lower portion of the coil housing portion than in the gas-cooled power equipment shown in FIG. 1, the horizontal gas passage 6 formed in the lower portion of the coil housing portion is also reduced. Insulating gas flows. Therefore, it is possible to prevent a local temperature rise of the coil 3 which occurs in the lower center of the coil housing portion.

FIG. 4 is a vertical cross-sectional view showing the structure of the coil accommodating portion of the gas-cooled power equipment according to the fourth embodiment of the present invention. In the figure, 1 is an outer insulating cylinder, 2 is an inner insulating cylinder arranged inside the outer insulating cylinder 1, and 3 is stacked and accommodated in a coil accommodating portion formed between the outer insulating cylinder 1 and the inner insulating cylinder 2. The outer vertical gas passage 4 and the inner vertical gas passage 5 are formed between the coils 3 and the outer insulating cylinder 1 and the inner insulating cylinder 2. In the figure, 6 is a horizontal gas passage formed between the coils 3, and 7 is a gas inlet provided in the lower part of the coil housing portion. The gas is made to flow into the horizontal gas passage 6 by changing the flow direction from the vertical direction to the horizontal direction by the plurality of flow diverting members 8.

The diverting members 8 are alternately provided on the outer vertical gas passages 4 and the inner vertical gas passages 5, and the vertical gas passages 4, 4 are provided in each of the diverting sections defined by the diverting members 8. 5
The narrow path member 10 that narrows the cross-sectional area of the flow path is provided.

The narrow passage member 1 for narrowing the flow passage cross-sectional area of the vertical gas passages 4 and 5 in the straight flow section divided by the straight flow member 8 as described above.
When 0 is provided, the gas flow rate to the horizontal gas passage 6 increases on the lower side in the mixed flow section, and the lower side coil 3 having the highest rate of temperature rise in the mixed flow section can be effectively cooled. It is possible to reduce the temperature difference of the coil 3 in the bent flow section. Further, since it is not necessary to reduce the size of the horizontal gas passage 6 toward the upper part of the coil housing portion, it is advantageous in terms of insulation.

FIG. 5 is a longitudinal sectional view showing the structure of the coil housing portion of the gas-cooled power equipment according to the fifth embodiment of the present invention. In the figure, 1 is an outer insulating cylinder, 2 is an inner insulating cylinder arranged inside the outer insulating cylinder 1, and a plurality of coils 3 are stacked between the outer insulating cylinder 1 and the inner insulating cylinder 2. A coil accommodating portion for accommodating is formed. Also,
Reference numeral 7 in the figure denotes a gas inlet provided in the lower portion of the coil housing portion, and the insulating gas flowing from the gas inlet 7 into the lower portion of the coil housing portion is formed between the outer insulating cylinder 1 and the coil 3. The gas flows through the outer vertical gas passage 4 and the inner vertical gas passage 5 formed between the inner insulating cylinder 2 and the coil 3 and is discharged from a gas discharge port (not shown) provided in the upper part of the coil housing. It has become so.

The outer diameter of the coil 3 becomes larger as it gets closer to the upper part of the coil accommodating part, so that the flow passage cross-sectional area of the outer vertical gas passage 4 is directed toward the gas discharge side of the coil accommodating part (upper part in the figure). Is becoming narrower.

When the cross-sectional area of the flow path of the outer vertical gas passage 4 is narrowed toward the gas discharge side of the coil accommodating portion in this way, the pressure difference between the outer side and the inner side of the horizontal gas passage 6 formed between the coils 3 is increased. Occurs, and the insulating gas flows into the horizontal gas passage 6 from the outer vertical gas passage side toward the inner vertical gas passage side. When the insulating gas flows into the horizontal gas passage 6, the coil 3
Since the coefficient of heat transfer from the to the insulating gas is increased, the temperature rise of the coil 3 can be suppressed. Further, since the flow velocity of the insulating gas flowing through the horizontal gas passage 6 becomes faster as it approaches the gas discharge side of the coil housing portion, the coil 3 can be cooled more effectively. As a result, the temperature distribution of the coil accommodating portion becomes uniform, so that it is possible to prevent a local temperature increase of the coil 3 that occurs in the upper part of the coil accommodating portion. Further, since it is not necessary to reduce the size of the horizontal gas passage 6 toward the upper part of the coil housing portion, it is advantageous in terms of insulation.

In the fifth embodiment described above, the flow passage cross-sectional area of the outer vertical gas passage 4 is narrowed toward the gas discharge side of the coil housing portion, but the flow passage cross-sectional area of the inner vertical gas passage 5 is housed in the coil. It may be narrowed toward the gas discharge side of the section.

FIG. 6 is a vertical cross-sectional view showing the structure of the coil accommodating portion of the gas-cooled power equipment according to the sixth embodiment of the present invention. In the figure, 1 is an outer insulating cylinder, 2 is an inner insulating cylinder arranged inside the outer insulating cylinder 1, and a plurality of coils 3 are stacked between the outer insulating cylinder 1 and the inner insulating cylinder 2. A coil accommodating portion for accommodating is formed. Also,
Reference numeral 7 in the figure denotes a gas inlet provided in the lower portion of the coil housing portion, and the insulating gas flowing from the gas inlet 7 into the lower portion of the coil housing portion is formed between the outer insulating cylinder 1 and the coil 3. The gas flows through the outer vertical gas passage 4 and the inner vertical gas passage 5 formed between the inner insulating cylinder 2 and the coil 3 and is discharged from a gas discharge port (not shown) provided in the upper part of the coil housing. It has become so.

The coil 3 is accommodated in the coil accommodating portion with its outer diameter portion alternately approaching the outer insulating cylinder side and the inner insulating cylinder side, whereby the flow paths of the outer vertical gas passage 4 and the inner vertical gas passage 5 are accommodated. The cross-sectional area is narrowing alternately.

When the flow passage cross-sectional areas of the outer vertical gas passage 4 and the inner vertical gas passage 5 are alternately narrowed in this way, the insulating gas flowing from the gas inlet 7 to the lower portion of the coil housing portion is allowed to flow into the outer vertical gas passage 4. And the flow direction is changed from the vertical direction to the horizontal direction at the portion where the flow passage cross-sectional area of the inner vertical gas passage 5 is narrowed,
It flows into a horizontal gas passage 6 formed between each coil 3.
As a result, the heat transfer coefficient from the coil 3 to the insulating gas in the horizontal gas passage 6 becomes large, so that the temperature rise of the coil 3 can be suppressed. Further, since it is not necessary to reduce the size of the horizontal gas passage 6 toward the upper part of the coil housing portion, it is advantageous in terms of insulation.

[0032]

As described above, according to the first to sixth aspects of the present invention, there is provided a gas-cooled power device having a high cooling efficiency, a uniform temperature distribution, and an insulating advantage. it can.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing the structure of a coil housing portion of a gas-cooled power device according to a first embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view showing the structure of a coil housing portion of a gas-cooled power device according to a second embodiment of the present invention.

FIG. 3 is a vertical cross-sectional view showing the structure of a coil housing portion of a gas-cooled power device according to a third embodiment of the present invention.

FIG. 4 is a vertical cross-sectional view showing the structure of a coil housing portion of a gas-cooled power device according to a fourth embodiment of the present invention.

FIG. 5 is a vertical cross-sectional view showing the structure of a coil housing portion of a gas-cooled power device according to a fifth embodiment of the present invention.

FIG. 6 is a vertical cross-sectional view showing the structure of a coil housing portion of a gas-cooled power device according to a sixth embodiment of the present invention.

FIG. 7 is a vertical cross-sectional view showing the structure of a coil housing portion of a conventional gas-cooled power device.

FIG. 8 is a vertical cross-sectional view showing the structure of a coil housing portion of a conventional gas-cooled power device.

9 is a diagram showing a flow velocity distribution of an insulating gas in the gas-cooled power equipment shown in FIG.

FIG. 10 is a diagram showing a flow velocity distribution of insulating gas when the flow path of the horizontal gas passage is made small.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Outer insulation cylinder 2 ... Inner insulation cylinder 3 ... Coil 4 ... Outer vertical gas passage 5 ... Inner vertical gas passage 6 ... Horizontal gas passage 7 ... Gas inlet 8 ... Bending member 9 ... Central vertical gas passage 10 ... Narrow passage Element

Claims (6)

[Claims] 1. A plurality of energizing coils are stacked and accommodated in a coil accommodating portion formed between an outer insulating cylinder and an inner insulating cylinder, and between these coils and the outer insulating cylinder and the inner insulating cylinder. An insulating gas is circulated in the formed outer vertical gas passage and the inner vertical gas passage and a horizontal gas passage formed between each coil, and the insulating gas is provided in the outer vertical gas passage and the inner vertical gas passage. In a gas-cooled power equipment provided with a plurality of flow diverting members for changing the flow of the vertical direction from the horizontal direction, the installation intervals of the flow diverting members are set on the gas inflow side of the outer vertical gas passage and the inner vertical gas passage. Gas-cooled power equipment characterized by being enlarged. 2. A plurality of energizing coils are stacked and accommodated in a coil accommodating portion formed between the outer insulating cylinder and the inner insulating cylinder, and between the coils and the outer insulating cylinder and the inner insulating cylinder. An insulating gas is circulated in the formed outer vertical gas passage and the inner vertical gas passage and a horizontal gas passage formed between each coil, and the insulating gas is provided in the outer vertical gas passage and the inner vertical gas passage. In a gas-cooled power equipment provided with a plurality of flow diverting members for changing the flow of the vertical direction from the horizontal direction, the installation intervals of the flow diverting members are set on the gas inflow side of the outer vertical gas passage and the inner vertical gas passage. A gas-cooled power device, characterized in that it is enlarged and a central vertical gas passage is provided in a lower portion of the coil housing portion. 3. A plurality of energizing coils are stacked and accommodated in a coil accommodating portion formed between the outer insulating cylinder and the inner insulating cylinder, and between the coils and the outer insulating cylinder and the inner insulating cylinder. An insulating gas is circulated in the formed outer vertical gas passage and the inner vertical gas passage and a horizontal gas passage formed between each coil, and the insulating gas is provided in the outer vertical gas passage and the inner vertical gas passage. In a gas-cooled power equipment provided with a plurality of flow diverting members for changing the flow of the vertical direction from the horizontal direction, the installation intervals of the flow diverting members are set to the gas discharge side of the outer vertical gas passage and the inner vertical gas passage. A gas-cooled power device characterized by gradually decreasing its size. 4. A plurality of energizing coils are stacked and accommodated in a coil accommodating portion formed between the outer insulating cylinder and the inner insulating cylinder, and between the coils and the outer insulating cylinder and the inner insulating cylinder. An insulating gas is circulated in the formed outer vertical gas passage and the inner vertical gas passage and a horizontal gas passage formed between each coil, and the insulating gas is provided in the outer vertical gas passage and the inner vertical gas passage. In a gas-cooled power device provided with a plurality of flow diverting members for changing the flow of the flow from the vertical direction to the horizontal direction, the outer vertical gas passage or the inner vertical gas passage is formed in the flow diverting section divided by the flow diverting members. A gas-cooled power device, characterized in that a narrow path member for narrowing the flow passage cross-sectional area is provided. 5. A plurality of energizing coils are stacked and accommodated in a coil accommodating portion formed between the outer insulating cylinder and the inner insulating cylinder, and between the coils and the outer insulating cylinder and the inner insulating cylinder. In a gas-cooled power device for circulating an insulating gas in the formed outer vertical gas passage and the inner vertical gas passage and a horizontal gas passage formed between each coil, in the outer vertical gas passage or the inner vertical gas passage, A gas-cooled power device, characterized in that a flow passage cross-sectional area is narrowed toward a gas discharge side of the coil housing portion. 6. A plurality of energizing coils are stacked and accommodated in a coil accommodating portion formed between the outer insulating cylinder and the inner insulating cylinder, and between the coils and the outer insulating cylinder and the inner insulating cylinder. In a gas-cooled power device for circulating an insulating gas in the formed outer vertical gas passage and the inner vertical gas passage and a horizontal gas passage formed between each coil, in the outer vertical gas passage or the inner vertical gas passage, A gas-cooled power device characterized by alternately narrowing the flow passage cross-sectional area.