JP7228377B2 - static induction electric machine - Google Patents

Description

The present invention relates to static induction appliances.

Static induction electric appliances such as transformers and reactors have a structure in which a main body composed of windings and a core is housed in a tank, and the tank is filled with an insulating medium that serves as both electrical insulation and cooling.

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

Here, FIG. 1 shows a side view of a conventional transformer as an example of a static induction electric machine. A transformer 1 comprises a transformer tank 2 containing a main body (not shown) composed of windings (not shown) and an iron core (not shown), and a radiator 3 having a plurality of heat sinks 3a. and a bushing 4 for introducing a high voltage. The radiator 3 is connected via a connecting pipe 5 provided in the transformer tank 2 . The interior of the transformer 1 is filled with an insulating medium (not shown) that serves both electrical insulation and cooling. The insulating medium circulates through the transformer tank 2 and the radiator 3 connected to the transformer tank 2, and releases heat generated in the windings and iron core of the radiator 3 to the atmosphere. As the insulating medium, in the case of liquid, for example, mineral-based insulating oil, and in the case of gas, for example, sulfur hexafluoride (SF ₆ ) can be considered. In the case of large-capacity transformers, some transformers are provided with a cooling fan 6 to promote heat exchange between the insulating 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. FIG. The wind leaks out of the radiator 3 due to the pressure loss in the radiator plate 3 a of the radiator 3 . As a result, the amount of air in the upper part of the radiator 3, where the temperature difference from the air temperature is large, is reduced, and the cooling efficiency of the radiator 3 is lowered.

Japanese Utility Model Laid-Open No. 62-23427 JP 2017-180182 A

Patent Document 1 is a patent aimed at improving the cooling efficiency of a radiator provided in a transformer. In Patent Document 1, a radiator is connected to a transformer tank containing a main body via a connection pipe, and a cooling fan is attached to the lower surface of the radiator to blow air upward from below. A guide is provided at the outer end of the radiator to prevent air from flowing outward in the width direction of the radiator plate.

However, in general, stationary induction electric appliances are sometimes required to operate 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. As in Patent Document 1, when a guide is provided on the side of the radiator, the guide, which works effectively during forced air cooling operation, blocks the flow of air from the outside during natural cooling operation. No consideration is given to lowering the cooling efficiency of the heat sink.

Patent Document 2 is a patent aimed at improving the cooling efficiency in both the forced air cooling operation and the natural cooling operation. In Patent Document 2, a movable partition plate is provided on the side surface of the radiator, and the partition plate is horizontal in the height direction of the radiator during forced air cooling operation to prevent the air from the cooling fan from diffusing in the width direction of the radiator. Also, during the self-cooling operation, the partition plate is set perpendicular to the height direction of the radiator to take in the flow of air from the outside. In this way, by changing the angle of the partition plate between the forced air cooling operation and the natural cooling operation, the heat exchange efficiency of the radiator is improved in both operating states.

However, when such a structure is adopted, since the partition plate is a movable part, no consideration is given to the problem that the movable part is stuck and does not operate, and maintenance is complicated.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and an object of the present invention is to improve cooling efficiency and provide a compact static induction electric machine.

In order to achieve the above object, the static induction electric machine of the present invention comprises a transformer, a radiator connected to the transformer for cooling the transformer with an insulating medium, and a partition plate arranged on the outer surface of the radiator. and a cooling fan for promoting heat exchange between the insulating medium and the atmosphere, wherein the partition plate has a gap communicating with the outside of the stationary induction electric appliance. The partition plate prevents the air from the cooling fan from leaking out of the radiator during the forced air cooling operation when the cooling fan operates, and on the other hand, during the natural cooling operation when the cooling fan does not operate. a chimney effect in the closed space formed by the radiator and the partition plate to increase the air volume in the radiator and to take outside air into the radiator through the gap formed in the partition plate; Characterized by

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

1 is a side view of a conventional transformer; FIG. FIG. 4 is a front view of a radiator provided in a conventional transformer, schematically showing the distribution of wind during forced air cooling operation. 1 is a side view of a transformer in a first embodiment of the invention; FIG. 1 is a schematic diagram of a partition plate used in the first embodiment of the invention; FIG. FIG. 2 schematically shows the distribution of wind during forced air cooling operation in the first embodiment of the present invention from the front of the radiator. FIG. 2 schematically shows the distribution of wind during self-cooling operation in the first embodiment of the present invention from the front of the radiator. The schematic block diagram of the partition plate used for the transformer in the 2nd Embodiment of this invention is shown. FIG. 8 schematically shows the distribution of wind during forced air cooling operation in the second embodiment of the present invention from the front of the radiator. FIG. 11 schematically shows the distribution of wind during self-cooling operation in the second embodiment of the present invention from the front of the radiator. The schematic block diagram of the partition plate used for the transformer in the 3rd Embodiment of this invention is shown.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings.

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

First, in one example of the embodiment shown in FIG. It consists of a radiator 3 having a plurality of heat sinks 3a and a bushing 4 for introducing high voltage. The radiator 3 is connected via a connecting pipe 5 provided in the transformer tank 2, and a cooling fan 6 is provided to facilitate heat exchange in the radiator 3. As shown in FIG. The above points are the same as the transformer 1 using the prior art 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 gap portion 9 is provided. In the case of a large-capacity transformer 1, it is almost always installed in an environment exposed to direct sunlight, wind and rain. Good materials are desirable. Also, in order to improve the heat exchange in the radiator 3, it is desirable to improve the heat transfer from the partition plate 8. FIG. In view of these facts, metal materials such as iron and steel are conceivable as materials for the partition plate 8 .

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 indicates the wind distribution. In the prior art shown in FIG. 1, the air from the cooling fan 6 leaks out of the radiator 3 due to the pressure loss caused by the radiator plate 3a that constitutes the radiator 3. As shown in FIG. In the first embodiment, by attaching the partition plate 8 to the side surface of the radiator 3 , it is possible to prevent the air from the cooling fan 6 from leaking to the outside of the radiator 3 .

FIG. 6 shows the wind distribution 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 indicates the wind distribution. In the self-cooling operation in which the radiator 3 is cooled by utilizing the driving force due to the air density difference, the conventional technology shown in FIG. By providing the partition plate 8 on the side surface of the radiator 3 as in the first embodiment, a large chimney effect can be obtained by increasing the temperature difference between the air inside the radiator 3 and the outside air. 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, if the radiator 3 is completely sealed with the partition plate 8, the air that has exchanged heat with the radiator 3 flows over the radiator 3, so the temperature difference with the radiator 3 becomes small and the heat exchange efficiency decreases. Deteriorate. Therefore, as in the first embodiment, by providing the partition plate 8 with the space 9 to take in the outside air, a large amount of air having a large temperature difference with the surface of the radiator 3 can be flowed to the radiator 3. . Therefore, heat exchange efficiency in the radiator 3 can be improved.

As a result, according to this embodiment, during the 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 to the outside of the radiator 3, thereby exchanging heat in the radiator 3. can promote During the self-cooling operation in which the cooling fan 6 does not operate, the chimney effect in the closed space formed by the radiator 3 and the partition plate 8 can increase the air volume in the radiator 3 . Furthermore, since outside air can be drawn into the radiator 3 through the gap 9 provided in the partition plate 8, the cooling efficiency can be improved even during self-cooling operation in which the cooling fan 6 does not operate.

In this embodiment, since only the partition plate 8 provided with the air gap 9 is provided in the radiator 3, there is no moving part, and the transformer using the conventional technology shown in FIG. The cooling efficiency in the radiator 3 can be improved without increasing the number.

As a result, if the temperature of the insulating medium enclosed in the transformer 1 is kept the same, the cooling area of the radiator 3 can be reduced. Therefore, the size and weight of the radiator 3 or the transformer 1 can be reduced.

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

FIG. 7 is a schematic configuration diagram of the partition plate 8 installed in the radiator 3 of the transformer 1 in an example of the second embodiment. As shown in FIG. 7, the gap portion 9 provided in the partition plate 8 is composed of a gap forming member 10 which is inclined upward in the height direction of the radiator 3 toward 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 an arrow 7 in the figure indicates the wind distribution. Since the gap forming member 10 is inclined upward in the height direction of the radiator 3 toward the radiator 3 , the air from the cooling fan 6 hits the gap forming member 10 and is returned toward the radiator 3 . Therefore, it is possible to reduce the amount of air flowing out of the radiator 3 through the gap 9 provided in the partition plate 8, and to improve the heat exchange efficiency of the radiator 3. As shown in FIG.

FIG. 9 shows the wind distribution when the cooling fan 6 is not operated in the second embodiment. FIG. 9 is a front view of the radiator 3, and an arrow 7 in the figure indicates the wind distribution. Since the air gap forming member 10 provided on the partition plate 8 is inclined toward the radiator 3 and upward of the radiator 3, the outside air is introduced into the radiator 3 by utilizing the chimney effect of the radiator 3. Easier to take in. Therefore, since a large amount of outside air can flow into the radiator 3, the cooling efficiency of the radiator 3 can be improved even during self-cooling operation.

As a result, the cooling efficiency of the radiator 3 can be improved in both the forced air cooling operation and the natural cooling operation. If the temperature of the insulating medium enclosed in the transformer 1 is kept the same, the cooling area of the radiator 3 can be reduced. The size and weight of the radiator 3 or the transformer 1 can be reduced.

A third embodiment of a static induction electric appliance according to the present invention will be described with reference to FIG. The present embodiment is a modified example of the first embodiment, and the same or similar parts as those of the first embodiment are denoted 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 an example of the third embodiment. As shown in FIG. 10 , the gaps 9 provided in the partition plate 8 have 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 narrowing the opening of the gap 9 toward the upper portion of the radiator 3, air leakage from the upper portion of the radiator can be prevented during forced air cooling operation. Further, during self-cooling operation, the temperature difference between the upper part of the radiator 3 and the outside air can be increased, so the buoyancy due to the chimney effect can be increased. Since it is wider, it is possible to increase the inflow of outside air from the lower part of the radiator 3 .

As a result, the cooling efficiency of the radiator 3 can be improved in both the forced air cooling operation and the natural cooling operation. If the temperature of the insulating medium enclosed in the transformer 1 is kept the same, the cooling area of the radiator 3 can be reduced. The size and weight of the radiator 3 or the transformer 1 can be reduced.

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 plate 9 ... Gap part 10 ... Gap forming member

Claims (3)

a transformer;
a radiator connected to the transformer and cooling the transformer with an insulating medium;
a partition plate arranged on the outer surface of the radiator;
a cooling fan for promoting heat exchange between the insulating medium and the atmosphere ,
The partition plate is formed with a gap that communicates with the outside of the stationary induction appliance,
During forced air cooling operation in which the cooling fan operates, the partition plate prevents the air from the cooling fan from leaking to the outside of the radiator,
On the other hand, during the self-cooling operation in which the cooling fan does not operate, the chimney effect in the closed space formed by the radiator and the partition plate increases the air volume in the radiator and the gap formed in the partition plate. A static induction electric appliance, characterized in that outside air is taken into the interior of said radiator from a a transformer;
a radiator connected to the transformer and cooling the transformer with an insulating medium;
a partition plate arranged on the outer surface of the radiator;
a cooling fan for promoting heat exchange between the insulating medium and the atmosphere,
The partition plate is formed with a gap that communicates with the outside of the stationary induction appliance,
The gap formed in the partition plate is composed of a gap forming member that is inclined upward in the height direction of the radiator toward the radiator,
when the cooling fan is operated, air from the cooling fan hits the air gap forming member and returns to the radiator;
On the other hand, when the cooling fan is not operated, the stationary induction electric machine is characterized in that outside air is taken into the inside of the radiator by utilizing a chimney effect in the radiator. a transformer;
a radiator connected to the transformer and cooling the transformer with an insulating medium;
a partition plate arranged on the outer surface of the radiator;
a cooling fan for promoting heat exchange between the insulating medium and the atmosphere,
The partition plate is formed with a gap that communicates with the outside of the stationary induction appliance,
The openings of the gaps formed in the partition plate are formed to become progressively smaller in the height direction of the radiator,
During forced air cooling operation, wind leakage is prevented in the height direction upper part of the radiator, and during natural cooling operation, the buoyancy due to the chimney effect is reduced by increasing the temperature difference between the height direction upper part of the radiator and the outside air. A static induction electric appliance characterized by increasing the size of the radiator and increasing the amount of inflow of outside air from the lower part in the height direction of the radiator .

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