JP7337643B2 - Molded stationary induction device - Google Patents

Description

Embodiments of the present invention relate to molded stationary induction devices.

In mold-type static induction devices, if the humidity inside the sealed container rises due to the release of moisture contained in the insulator or the increase in relative humidity due to the decrease in the outside temperature, the dry air insulation will be affected by the moisture in the dry air. It may lead to a decrease in withstand voltage. From this background and from the viewpoint of strengthening insulation, it is necessary to lower the humidity in the sealed container. However, since the inside of the closed container is a closed space, it is difficult to control the inside of the closed container to lower the humidity when the humidity increases.

JP-A-10-149925 Japanese Utility Model Laid-Open No. 6-82827 Japanese Utility Model Publication No. 49-35696

The present invention has been made in view of the above problems, and an object of the present invention is to provide a mold-type static induction device capable of reducing the humidity in the closed container.

A mold-type stationary induction device according to an embodiment includes a sealed container that houses a transformer body therein, encloses air, a heat exchanger that cools the air, and the sealed container and the heat exchanger, which are arranged in an upper part. An upper pipe connected at the bottom, a lower pipe connected at the bottom, and a moisture absorption part provided in the upper pipe, and the air is supplied to the sealed container, the upper pipe, the heat exchanger, and the lower pipe. Cycle in order.

BRIEF DESCRIPTION OF THE DRAWINGS Longitudinal cross-sectional view showing a schematic configuration of a mold-type stationary induction device according to a first embodiment A vertical cross-sectional view showing a schematic configuration of a mold-type static induction device according to a second embodiment.

Hereinafter, embodiments will be described based on the drawings. In the description of the embodiments, substantially the same components are denoted by the same reference numerals, and descriptions thereof are omitted. In the following description and drawings, the vertical direction means the vertical direction when the molded transformer 1 is installed. In addition, the hatching of the hygroscopic part 20 and the hygroscopic part 21 in the drawings is provided to distinguish them from other members, and does not indicate their cross-sectional structure.

(First embodiment)
A molded transformer 1 according to the first embodiment will be described with reference to FIG. The molded transformer 1 according to the embodiment is illustrated as an example of a molded stationary induction device. FIG. 1 shows a schematic configuration of a molded transformer 1. As shown in FIG. In FIG. 1, the right half of the transformer main body 2 shows the internal structure of the transformer main body 2. As shown in FIG.

The molded transformer 1 comprises a transformer main body 2 constituting the main part of the molded static induction device, a sealed container 3 containing the transformer main body 2, and provided on both sides of the sealed container 3, that is, on the left and right sides in FIG. and a heat exchanger 4. The transformer main body 2 is composed of a combination of a winding 5 and an iron core 6 whose surfaces are covered with an insulating material, and constitutes the main part of the transformer. The winding 5 is provided with a gap 5a penetrating vertically in FIG. A spacer (not shown) is provided in the space 5a to secure the space 5a. The air gap 5a forms part of a circulation path through which air 7, which will be described later, passes.

The sealed container 3 is a container whose interior is airtightly sealed, and air 7 having a pressure higher than the atmospheric pressure is enclosed in the interior while the transformer main body 2 is accommodated. The air 7 is dry air, and the humidity is set low. The closed container 3 and the heat exchanger 4 are connected by an upper pipe 8 connected to the upper part of the closed container 3 and a lower pipe 9 connected to the lower part of the closed container 3 so that the air 7 can pass through. The heat exchanger 4 has a so-called radiator structure and has a function of cooling the air 7 inside the transformer main body 2 . Air 7 acts as a coolant for cooling transformer body 2 .

The dashed arrows shown in the drawing indicate the circulation path and the circulation direction of the air 7 in the closed container 3 and the heat exchanger 4 . This also applies to FIG. 2 in the description of the second embodiment.

During operation of the molded transformer 1, the transformer main body 2 generates heat, and accordingly the temperature of the air 7 around the transformer main body rises. The air 7 whose temperature has risen rises in the sealed container 3 as indicated by the arrow in FIG. The air 7 cooled by the heat exchanger 4 flows below the heat exchanger 4, passes through the lower pipe 9, returns to the sealed container 3, and is further heated by the transformer main body 2 to raise the temperature. and then flows into the heat exchanger 4 again. Hereafter, this is repeated. Thus, a circulation path for the air 7 circulating between the sealed container 3 and the heat exchanger 4 is formed. The air 7 circulates between the closed container 3 and the heat exchanger 4 , thereby cooling the air 7 in the closed container 3 , the closed container 3 and the transformer main body 2 .

Here, in the middle of the circulation path of the air 7, the moisture absorbing section 20, which is the first moisture absorbing section, is arranged. The moisture absorbing part 20 is formed by, for example, placing a moisture absorbing agent, a dehumidifying agent, or a desiccating agent in a structure forming a hollow honeycomb structure, or by placing a moisture absorbing agent, a desiccant, or a desiccant on the inner wall of a hollow cylindrical member. It is configured to have a structure in which a dehumidifying agent or desiccant is fixed and gas can pass through. A moisture absorbent, a dehumidifier, or a desiccant is provided inside the moisture absorbing part 20, and by removing moisture from the gas passing through the moisture absorbing part 20, the humidity of the gas can be reduced. As moisture absorbers, dehumidifiers, or desiccants, for example, chemical desiccants or physical desiccants can be used. Examples of chemical adsorbents that can be used include quicklime, calcium chloride, diphosphorus pentoxide, sodium hydroxide/potassium hydroxide, metallic sodium, anhydrous sodium sulfate, anhydrous copper sulfate, and magnesium perchlorate. . Examples of physical desiccants that can be used include silica gel, aluminum oxide, molecular sieves, allophane, zeolite, and the like.

In this embodiment, the hygroscopic part 20 is arranged in the upper pipe 8 through which the air 7 passes, that is, in the pipe on the suction side of the heat exchanger 4 . Since the air 7 absorbs moisture when passing through the transformer main body 2 , the humidity becomes highest after passing through the transformer main body 2 . The air 7 with increased humidity then passes through the upper pipe 8 and flows into the heat exchanger 4, so the air 7 in the upper pipe 8 has the highest humidity. By arranging the moisture absorbing part 20 in the upper pipe 8, the air 7 having the highest humidity can be brought into contact with the moisture absorbing part 20, so that the moisture content of the air 7 can be most effectively reduced. . In addition, if the air 7 contains a lot of moisture, the heat exchanger 4 may rust due to condensation in the heat exchanger 4. Arrangement in the upper pipe 8 is preferable.

Further, in the mold transformer 1 according to the present embodiment, a moisture absorbing portion 21 as a second moisture absorbing portion is additionally provided under the heat exchanger 4 . Moisture absorption portion 21 allows dew condensation generated in heat exchanger 4 to be brought into contact with moisture absorption portion 21 to remove moisture, thereby suppressing the occurrence of rust on heat exchanger 4 . Here, the bottom portion of the heat exchanger 4 may be inclined downward toward the moisture absorption portion 21 so that the condensed water falling on the bottom portion of the heat exchanger 4 easily flows into the moisture absorption portion 21 .

Moreover, in the molded transformer 1 according to the first embodiment, the moisture absorbing portion 20 can be of a detachable cartridge type. In this case, the hygroscopic part 20 can be configured, for example, by enclosing a hygroscopic agent in a screw-type case that can be detached in the middle of the upper pipe 8 . In this way, when the moisture absorption performance of the moisture absorption part 20 deteriorates, the moisture absorption part 20 can be replaced without stopping the operation of the molded transformer 1, for example, during self-cooling operation in which the operation load of the molded transformer 1 is small. is possible, so maintainability is excellent.

Also, the moisture absorbing portion 21 may be detachably laid under the heat exchanger 4 . In this case, the hygroscopic part 21 can be configured, for example, by sealing a hygroscopic agent in a screw-type case that can be attached to and detached from the lower part of the heat exchanger 4 . In this way, when the moisture absorption performance of the moisture absorption part 21 deteriorates, the moisture absorption part 21 can be replaced without stopping the operation of the molded transformer 1, for example, during the self-cooling operation in which the operation load of the molded transformer 1 is small. is possible, so maintainability is excellent.

The molded transformer 1 according to the first embodiment has the following effects.
In the above configuration, since the moisture absorption part 20 is arranged in the upper pipe 8, the moisture absorption part 20 can be brought into contact with the air 7 containing water and having the highest humidity when passing through the main body 2 of the transformer. did. As a result, the moisture in the air 7 can be efficiently removed, so that the humidity of the air 7 in the closed container 3 can be lowered, and the deterioration of the dielectric strength of the air 7 can be prevented.

Moreover, since the moisture absorption part 20 is arranged in the upper pipe 8 arranged in front of the heat exchanger 4 , the air 7 can be brought into contact with the moisture absorption part 20 before flowing into the heat exchanger 4 . As a result, since the air 7 containing moisture does not flow into the heat exchanger 4, it is possible to suppress dew condensation inside the heat exchanger 4, and the metal parts inside the heat exchanger 4 are prevented from rusting. can be suppressed.

Moreover, since the moisture absorption part 21 is provided in the lower part of the heat exchanger 4 , the moisture in the air 7 can be removed by bringing the dew condensation generated in the heat exchanger 4 into contact with the moisture absorption part 21 . As a result, the humidity of the air 7 can be further reduced, and since moisture does not accumulate at the bottom of the heat exchanger 4, rusting of the heat exchanger 4 can be suppressed.

(Second embodiment)
A molded transformer 1 according to a second embodiment will be described with reference to FIG. The molded transformer 1 includes a transformer main body 2, a sealed container 3 containing the transformer main body 2, and a heat exchanger 4 provided on the side of the sealed container 3, that is, on the right side in FIG. .

In the airtight container 3, air 7 is enclosed at a pressure higher than the atmospheric pressure while the transformer main body 2 is accommodated. The air 7 is dry air, and the humidity is set low. The sealed container 3 and the heat exchanger 4 are connected by a first route 10 composed of an upper pipe 8 connected to the upper part of the sealed container 3 and a lower pipe 9 connected to the lower part of the sealed container 3. , air 7 can pass through. The heat exchanger 4 has a so-called radiator structure and has a function of cooling the air 7 inside the transformer main body 2 . Air 7 circulates through closed container 3, upper pipe 8, heat exchanger 4, and lower pipe 9 in this order.

The lower pipe 9 is provided with a path 14 which is a second path branching from the middle of the lower pipe 9 and having a circulator 11 . That is, between the middle of the lower pipe 9 and the sealed container 3, the air 7 passes through a path 14 composed of a pipe 12, a circulator 11, and a pipe 13 branched from the middle of the lower pipe 9. connected as possible. The circulator 11 is a blower equipped with a motor and rotating blades (not shown). Circulation of air 7 can be carried out rapidly.

An on-off valve 16 is provided on the path 10 on the closed container 3 side of the connecting position of the pipe 12 . An on-off valve 18 is provided in the pipe 12 of the circulator 11 . The on-off valve 16 and the on-off valve 18 can open and close the lower pipe 9 and the pipe 12 by opening and closing the valve, thereby controlling the flow of the air 7 in the lower pipe 9 and the pipe 12 . The on-off valve 16 and the on-off valve 18 can be opened and closed in conjunction with each other. When the on-off valve 16 is opened, the on-off valve 18 is closed, and when the on-off valve 16 is closed, the on-off valve 18 is opened. Thus, the path 10 and the path 14 can be selectively switched as the circulation path for the air 7 .

In the molded transformer 1 according to the second embodiment, the on-off valve 16 and the on-off valve 18 are controlled so that the air 7 passes through the path 14 when the circulator 11 is driven. Since the air 7 is forcibly circulated by the circulator 11, the moisture in the air 7 can be rapidly removed and the humidity of the air 7 can be rapidly lowered. Moreover, in the molded transformer 1 according to the second embodiment, the moisture absorbing portion 20 can be of a cartridge type detachable from the upper pipe 8 .

In this embodiment, the hygroscopic part 20 is arranged in the upper pipe 8 through which the air 7 passes. As in the first embodiment, the air 7 has the highest humidity after passing through the transformer main body 2 . By arranging the moisture absorbing part 20 in the upper pipe 8, the air 7 having the highest humidity can be brought into contact with the moisture absorbing part 20, so that the moisture in the air 7 can be most effectively reduced. Become. Also, if the air 7 contains a lot of moisture, the heat exchanger 4 may rust due to condensation in the heat exchanger 4. is preferably arranged in the upper pipe 8 of the

The molded transformer 1 according to the second embodiment has the same effect as the first embodiment. Further, the mold transformer 1 in the second embodiment can allow the air 7 to pass through the path 14 including the circulator 11 . By driving the circulator 11 and selecting the path 14, the air 7 can be rapidly circulated in the closed container 3 and the heat exchanger 4, so that the humidity of the air 7 can be rapidly lowered.

For example, when the humidity inside the sealed container 3 increases, or when the sealed container 3 is opened for maintenance of the transformer main body 2, etc., the air 7 inside the sealed container 3 can be rapidly released by driving the circulator 11. Since the humidity of the heat exchanger 4 can be reduced, the dew condensation on the heat exchanger 4 can be suppressed more quickly.

Although the first embodiment and the second embodiment have been described as above, the following modifications can be made.
In the first and second embodiments, the molded transformer 1 is illustrated as a molded stationary induction device, but the invention is not limited to this. For example, it may be applied to a reactor.

While several embodiments of the invention have been described above, these embodiments are provided by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and modifications can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the scope of the invention described in the claims and equivalents thereof.

DESCRIPTION OF SYMBOLS 1... Molded transformer (molded static induction device), 2... Transformer main body, 3... Closed container, 4... Heat exchanger, 7... Air, 8... Upper pipe, 9... Lower pipe, 10... Route (first path), 11... circulator, 12, 13... piping, 14... path (second path), 16, 18... on-off valve, 20... hygroscopic part (first hygroscopic part), 21... hygroscopic part (second hygroscopic part )

Claims (5)

A sealed container that houses the main body of the transformer inside and encloses air;
a heat exchanger for cooling the air;
An upper pipe that connects the closed container and the heat exchanger at the top and a lower pipe that connects the heat exchanger at the bottom;
and a first moisture absorption part provided in the upper pipe,
the air circulates through the sealed container, the upper pipe, the heat exchanger, and the lower pipe in that order;
A mold-type stationary induction device, wherein a second moisture absorption part is provided at a position below the heat exchanger and different from the path through which the air circulates. 2. The mold type static induction device according to claim 1, wherein the first moisture absorbing part is detachably provided. 3. The method according to claim 1 or 2, further comprising a second route branching from the middle of the lower pipe and connected to a sealed container provided with a circulator when the route passing through the lower pipe is the first route. Molded stationary induction device. The first path and the second path are provided with on-off valves capable of selectively switching between the first path passing through the lower pipe and the second path passing through the circulatory system. Item 4. The mold-type stationary induction device according to Item 3. 2. The mold type static induction device according to claim 1 , wherein the second moisture absorbing part is detachably provided.

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