JP2020092171A - Static induction - Google Patents

Abstract

To improve cooling efficiency to provide compact static induction.SOLUTION: A static induction includes a transformer body 1, a radiator 3 that cools the transformer body 1 with an insulating medium, and a partition plate 8 located on the outside of the radiator. The partition plate 8 has a gap 9 communicating with the outside of the static induction.SELECTED DRAWING: Figure 3

Description

The present invention relates to a static induction electric machine.

A static induction electric device such as a transformer or a reactor has a structure in which a content main body composed of a winding wire and an iron core is housed in a tank, and the tank is filled with an insulating medium for both electrical insulation and cooling.

When the static induction machine is operated, heat is generated in the winding and the iron core, so that the temperature inside the static induction machine rises. The service life of static induction appliances is mainly determined by the deterioration of the insulation. Since the deterioration of the insulator depends on the temperature of the cooling medium, the temperature rise limit values of the cooling medium and the winding are defined by a predetermined standard. Therefore, the temperature rise in the stationary induction machine is suppressed by providing a heat radiation means for releasing the heat generated in the stationary induction machine to the outside or circulating a cooling medium.

Here, FIG. 1 shows a side view of a transformer according to the related art as an example of a static induction generator. The transformer 1 includes a transformer tank 2 in which a content body (not shown) composed of windings (not shown) and an iron core (not shown) is housed, and a radiator 3 having a plurality of heat dissipation plates 3a. And a bushing 4 for introducing a high voltage. The radiator 3 is connected via a connection pipe 5 provided in the transformer tank 2. The inside of the transformer 1 is filled with an insulating medium (not shown) that serves both electrical insulation and cooling. The insulating medium circulates in the transformer tank 2 and the radiator 3 connected to the transformer tank 2, and releases the heat generated in the windings and the iron core in the radiator 3 to the atmosphere. In the case of a liquid, for example, mineral insulating oil may be used as the cooling medium, and in the case of gas, for example, sulfur hexafluoride (SF ₆ ) may be used. In the case of a large capacity transformer, there is a transformer provided with a cooling fan 6 in order to promote heat exchange between the cooling medium and the atmosphere.

In FIG. 2, arrows 7 indicate the distribution of wind around the radiator 3 during the forced air cooling operation in which the cooling fan 6 is operated. FIG. 2 is a front view of the radiator 3. The wind leaks to the outside of the radiator 3 due to the pressure loss in the radiator plate 3a of the radiator 3. For this reason, the air volume in the upper portion of the radiator 3 where the temperature difference from the temperature of the atmosphere becomes large is reduced, and the cooling efficiency of the radiator 3 is reduced.

Japanese Utility Model Publication No. 62-23427 JP, 2017-180182, A

As a patent aiming at improving the cooling efficiency of a radiator provided in a transformer, there is Patent Document 1. In Patent Document 1, a radiator is connected to a transformer tank containing a main body of contents through a connecting pipe, and a cooling fan that blows air from below to above is attached to the lower surface of the radiator. At the outer end of the radiator, a guide is provided to prevent the outflow of air to the outside of the radiator in the width direction of the radiator plate.

However, in general, static induction electric appliances may be required to be operated in a self-cooling operation using natural convection of air in addition to the forced air cooling operation in which a cooling fan is operated. When a guide is provided on the side surface of the radiator as in Patent Document 1, the guide that is effectively operating during the forced air cooling operation blocks the air flow from the outside during the self-cooling operation. No consideration is given to reducing the cooling efficiency of the heat sink.

Patent Document 2 is a patent for the purpose of improving the cooling efficiency in both the forced air cooling operation mode and the self-cooling operation mode. In Patent Document 2, a movable partition plate is provided on the side surface of the radiator, and the partition plate is made horizontal in the radiator height direction during forced air cooling operation to prevent the wind from the cooling fan from spreading in the radiator width direction. Further, during the self-cooling operation, the partition plate is made perpendicular to the radiator height direction to take in the air flow from the outside. In this way, by changing the angle of the partition plate between the forced air cooling operation and the self-cooling operation, the heat exchange efficiency of the radiator is improved in both operating conditions.

However, when such a structure is adopted, since the partition plate is a movable part, the movable part is fixed and does not operate, and the maintenance is not taken into consideration.

The present invention has been made in view of the above points, and an object of the present invention is to provide a compact static induction machine with improved cooling efficiency.

If one of the representative ones of the present invention is shown, a static induction electric machine comprising a transformer, a radiator for cooling the transformer with an insulating medium, and a plate member arranged on the outer surface of the radiator, wherein: A static induction machine characterized in that the plate material has a void portion communicating with the outside of the static induction machine.

According to the present invention, it is possible to improve the cooling efficiency and provide a compact static induction generator.

It is a side view of the conventional transformer. FIG. 11 is a front view of a radiator provided in a conventional transformer, schematically showing a distribution of wind during forced air cooling operation. It is a side view of the transformer in a 1st embodiment of the present invention. It is a schematic diagram of a partition board used by a 1st embodiment of the present invention. It is the figure which showed typically the distribution of the wind at the time of forced air cooling operation|movement in the 1st Embodiment of this invention from the radiator front. It is the figure which showed the distribution of the wind at the time of self-cooling operation|movement in the 1st Embodiment of this invention typically from the radiator front. The schematic block diagram of the partition plate used for the transformer in the 2nd Embodiment of this invention is shown. It is the figure which showed typically the distribution of the wind at the time of forced air cooling operation|movement in the 2nd Embodiment of this invention from the radiator front. It is the figure which showed typically the distribution of the wind at the time of self-cooling operation in the 2nd Embodiment of this invention from the radiator front. The schematic block diagram of the partition plate used for the transformer in the 3rd Embodiment of this invention is shown.

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

FIG. 3 is a first embodiment of the present invention, which is an example of a case where the present invention is embodied as a transformer, and shows a side surface of the transformer 1.

First, in the example of the embodiment shown in FIG. 3, a transformer tank 2 in which a transformer 1 contains a main body (not shown) composed of a winding (not shown) and an iron core (not shown), The radiator 3 includes a plurality of heat sinks 3a and a bushing 4 for introducing a high voltage. The radiator 3 is connected via a connection pipe 5 provided in the transformer tank 2, and a cooling fan 6 is provided in order to promote heat exchange in the radiator 3. The above points are the same as those of the transformer 1 using the conventional technique shown in FIG.

A partition plate 8 is fastened to the side surface of the radiator 3 provided in the transformer 1 of the first embodiment. FIG. 4 shows a schematic configuration diagram of the partition plate 8 used in the first embodiment. The partition plate 8 has a structure in which a void portion 9 is provided. In the case of a large-capacity transformer 1, since it is almost always installed in an environment exposed to direct sunlight or wind and rain, the material of the partition plate 8 provided on the radiator 3 has deterioration characteristics against heat, ultraviolet rays, and the like. Excellent materials are desirable. Further, in order to improve heat exchange in the radiator 3, it is desirable to improve heat transfer from the partition plate 8. In view of these, as the material of the partition plate 8, for example, a metal material such as iron or steel can be considered.

FIG. 5 shows the distribution of wind when the cooling fan 6 is operated in the first embodiment. FIG. 5 is a front view of the radiator 3, and an arrow 7 in the figure shows the distribution of wind. In the conventional technique shown in FIG. 1, the wind from the cooling fan 6 leaks to the outside of the radiator 3 due to the influence of the pressure loss due to the heat dissipation plate 3 a forming the radiator 3. In the first embodiment, the partition plate 8 is attached to the side surface of the radiator 3, so that the wind from the cooling fan 6 can be prevented from leaking out of the radiator 3.

FIG. 6 shows the distribution of wind when the cooling fan 6 is not operated in the first embodiment. FIG. 6 is a front view of the radiator 3, and an arrow 7 in the figure shows the distribution of wind. In the conventional cooling operation shown in FIG. 1 in which the radiator 3 is cooled by using the driving force due to the difference in air density, the wind velocity in the radiator 3 is weak and the heat exchange efficiency is poor in the conventional technique. As in the first embodiment, by providing the partition plate 8 on the side surface of the radiator 3 to increase the temperature difference between the air inside the radiator 3 and the outside air, a large stack effect can be obtained. The buoyancy of the air inside 3 increases, and the wind speed increases. Thereby, the heat exchange efficiency of the radiator 3 can be improved. However, when the radiator 3 is completely sealed by the partition plate 8, the air that has exchanged heat with the radiator 3 flows to the upper portion of the radiator 3, so that the temperature difference between the radiator 3 and the radiator 3 becomes small and the heat exchange efficiency is improved. become worse. Therefore, as in the first embodiment, the partition plate 8 is provided with the void portion 9 so that the outside air can be taken in, so that a large amount of air having a large temperature difference from the surface of the radiator 3 can be flown into the radiator 3. .. Therefore, the heat exchange efficiency in the radiator 3 can be improved.

As a result, according to the present embodiment, during forced air cooling operation in which the cooling fan 6 operates, the partition plate 8 prevents the air from the cooling fan 6 from leaking out of the radiator 3, and the heat exchange in the radiator 3 is prevented. Can be promoted. During the self-cooling operation in which the cooling fan 6 does not operate, the air volume in the radiator 3 can be increased by the chimney effect in the closed space formed by the radiator 3 and the partition plate 8. Furthermore, since the outside air can be taken into the radiator 3 from the space 9 provided in the partition plate 8, the cooling efficiency can be improved even during the self-cooling operation in which the cooling fan 6 does not operate.

In this embodiment, since the radiator 3 is only provided with the partition plate 8 provided with the void portion 9, there is no movable part, and the transformer using the conventional technique shown in FIG. The cooling efficiency of the radiator 3 can be improved without increasing it.

As a result, if the temperature of the cooling medium enclosed in the transformer 1 is the same, the cooling area of the radiator 3 can be reduced, so the amount of material used for the radiator plate 3a and the amount of cooling medium used are reduced. Therefore, the radiator 3 or the transformer 1 can be made smaller and lighter.

A second embodiment of the stationary induction machine according to the present invention will be described with reference to FIGS. 7, 8 and 9. The present embodiment is a modification of the first embodiment, and the same or similar parts as those of the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

FIG. 7: is a schematic block diagram of the partition plate 8 installed in the radiator 3 of the transformer 1 in an example of 2nd Embodiment. As shown in FIG. 7, the space 9 provided in the partition plate 8 is composed of a space forming member 10 in which an upward slope is provided toward the radiator 3 in the height direction of the radiator 3.

FIG. 8 shows the distribution of wind when the cooling fan 6 is operated in the second embodiment. FIG. 8 is a front view of the radiator 3, and the arrow 7 in the figure indicates the distribution of wind. Since the void forming member 10 is inclined upward in the height direction of the radiator 3 toward the radiator 3, the wind from the cooling fan 6 hits the void forming member 10 and is returned to the radiator 3. Therefore, it is possible to reduce the outflow amount of the air from the void portion 9 provided in the partition plate 8 to the outside of the radiator 3, and it is possible to improve the heat exchange efficiency in the radiator 3.

FIG. 9 shows the distribution of wind when the cooling fan 6 is not operated in the second embodiment. FIG. 9 is a front view of the radiator 3, and the arrow 7 in the figure indicates the distribution of wind. Since the space forming member 10 provided on the partition plate 8 is provided with an inclination upward toward the radiator 3 toward the radiator 3, the chimney effect of the radiator 3 is used to bring outside air into the inside of the radiator 3. It becomes easy to take in. Therefore, a large amount of outside air can flow into the inside of the radiator 3, so that the cooling efficiency of the radiator 3 can be improved even during the self-cooling operation.

As a result, the cooling efficiency of the radiator 3 can be improved in both the forced air cooling operation mode and the self cooling operation mode. If the temperature of the cooling medium enclosed in the transformer 1 is the same, the cooling area of the radiator 3 can be reduced, so the amount of material used for the radiator plate 3a and the amount of cooling medium used can be reduced. It is possible to reduce the size and weight of the radiator 3 or the transformer 1.

A third embodiment of the stationary induction machine according to the present invention will be described with reference to FIG. The present embodiment is a modification of the first embodiment, and the same or similar parts as those of the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

FIG. 10 is a schematic configuration diagram of the partition plate 8 installed in the radiator 3 of the transformer 1 in the example of the third embodiment. As shown in FIG. 10, the voids 9 provided in the partition plate 8 are provided with voids 9 of different sizes in the height direction of the radiator 3.

For example, as shown in FIG. 10, when the partition plate 8 is constructed by making the opening of the void 9 smaller toward the upper part of the radiator 3, it is possible to prevent air leakage at the upper part of the radiator during forced air cooling operation. Further, during the self-cooling operation, the temperature difference with the outside air can be increased in the upper part of the radiator 3, so that the buoyancy due to the stack effect can be increased, and further, in the lower part of the radiator 3 in the height direction, the void 9 is formed. Since it is wide, the inflow of outside air from the lower part of the radiator 3 can be increased.

As a result, the cooling efficiency of the radiator 3 can be improved in both the forced air cooling operation mode and the self cooling operation mode. If the temperature of the cooling medium enclosed in the transformer 1 is the same, the cooling area of the radiator 3 can be reduced, so the amount of material used for the radiator plate 3a and the amount of cooling medium used can be reduced. It is possible to reduce the size and weight of the radiator 3 or the transformer 1.

DESCRIPTION OF SYMBOLS 1... Transformer, 2... Transformer tank, 3... Radiator, 3a... Heat sink, 4... Bushing, 5... Connection piping, 6... Cooling fan, 7... ..Wind distribution, 8...partition plates, 9...voids, 10...void forming members

Claims (3)

A transformer,
A radiator cooling the transformer with an insulating medium,
A plate material arranged on the outer surface of the radiator, and a static induction electric device comprising:
The static induction machine according to claim 1, wherein the plate material has a void portion communicating with the outside of the static induction machine. The static induction generator according to claim 1, wherein
The static induction electric device according to claim 1, wherein the radiator side of the cavity has an upward slope. The static induction electric device according to claim 1 or 2, wherein
The void portion comprises a first void portion and a second void portion, the first void portion is located higher than the second void portion, the opening area of the first void portion is the opening area of the second void portion. A static induction generator characterized by being smaller than.

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