JP2001291618A - Forced circulation cooling type transformer - Google Patents

Abstract

(57) [Problem] To provide a forced circulation cooling type transformer capable of preventing a gap between a shield plate and a tank wall and improving cooling performance. SOLUTION: A transformer main body 5 composed of an iron core 5b and a coil 5a, an insulating cooling medium 6, a tank 4 for storing the transformer main body 5 and the insulating cooling medium 6, and the inside of the tank is divided into an upper part and a lower part. In the forced circulation cooling type transformer having the partition plate 3 and forcibly circulating the insulating cooling medium 6 in the tank to cool the transformer main body 5, the partition plate 3 has a gap between the partition plate 3 and the tank wall surface 4a. A shield plate to be sealed is attached, and the shield plate is formed by the elastic plate 1a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a forced circulation cooling type transformer for cooling an iron core, a coil and the like by forcibly circulating an insulating cooling medium in a tank.

[0002]

2. Description of the Related Art Inside a tank constituting a transformer, a transformer body composed of an iron core, a coil and the like and an insulating cooling medium (insulating gas or insulating oil) are stored. During operation of this transformer, current flows through the coil, generating heat. If the heat is left untreated, the temperature of the transformer body rises, causing a failure of the transformer. Therefore, the transformer is cooled by various means.

A large-capacity power transformer is generally cooled in the following manner. A circulation circuit is formed by a heat exchanger provided outside the tank and a pipe connecting the heat exchanger and the tank, and gas or oil, which is an insulating cooling medium, is circulated through the circulation circuit as a cooling medium. In that case,
The insulating cooling medium absorbs heat generated from the iron core of the transformer body and the coil as a heat transfer medium, and releases the heat from the heat exchanger outside the tank. Thus, the absorption and release of heat are repeated by the circulation of the insulating cooling medium to cool the transformer. There are natural circulation and forced circulation in the circulation of the insulating cooling medium as the cooling medium.However, in the case of a transformer having a relatively large capacity, the amount of heat generated is large. Blower with insulating cooling medium provided outside (when the insulating cooling medium is gas) or pump
(When the insulating cooling medium is oil), the insulating cooling medium is forcibly circulated.

In the above forced circulation cooling type transformer, the flow distribution of the insulating cooling medium greatly affects the cooling efficiency.
When the insulating cooling medium flows along the coil portion of the transformer main body, which is a heat source, the amount of heat exchange increases, thereby improving the cooling efficiency. Conversely, when the insulating cooling medium flows along the portion away from the coil, the amount of heat exchange is reduced, and the cooling efficiency is reduced.

In Japanese Patent Application Laid-Open No. 10-116737, a partition plate for dividing the inside of a tank into an upper part and a lower part is provided, and an opening is provided in a part of the partition plate near a wall of the tank to provide an insulating cooling medium. Which are efficiently circulated to improve the cooling performance has been proposed.

[0006]

By the way, when the transformer main body is housed in the tank, it is common to attach the partition plate to the transformer main body and then put it into the tank for convenience of operation. . However, since the inner surface of the tank has a protruding part due to the presence of the joint between the tank and the pipe, when inserting the transformer body with the partition plate into the tank, the partition plate should not collide with the protruding part. In addition, a certain gap is required between the partition plate and the tank wall. In addition, a certain gap is required between the partition plate and the tank wall for insulation between the transformer main body and the tank.

[0007] If there is a gap between the partition plate and the tank wall, the insulating cooling medium flows through this gap,
The flow rate along the coil portion of the transformer body is reduced, and the cooling efficiency is reduced. For this reason, there is a device in which a shield plate is provided around a partition plate to seal a gap to improve cooling efficiency.

However, a press board is used as a conventional shield plate in consideration of insulation and the like. This press board is an inelastic body, has very low rigidity at the deformed portion, and is hard to return to its original position (shape) after being deformed.

Referring to FIG. 8, the shield plate 1 is formed by bending a single press board, and this is
And is fixed to the partition plate 3. The rigidity of the bent portion at the root is weak, and the force pressing the tip of the shield plate 1 against the tank wall surface 4a is weak. Therefore, the ability to seal the gap is reduced. Further, since the press board is hard, it is difficult to guarantee the close contact between the shield plate 1 and the tank wall surface 4a in the longitudinal direction.

If a gap is formed between the shield plate 1 and the tank wall 4a, the insulating cooling medium flows through the gap.
As a result, the amount of the insulating cooling medium flowing to the transformer main body side is reduced, the cooling efficiency is reduced, and the vibration of the shield plate 1 is excited, and abnormal noise is generated due to the collision between the shield plate 1 and the tank wall surface 4a. There was a risk of doing it.

As described above, the shield plate attached to the conventional forced circulation cooling type transformer is difficult to ensure the close contact with the tank wall.

An object of the present invention is to provide a forced circulation cooling type transformer capable of improving the performance of a shield plate by ensuring the close contact between the shield plate and the tank wall surface, preventing the generation of a gap, and improving the cooling performance. Is to do.

[0013]

SUMMARY OF THE INVENTION In order to achieve the above object, an invention of a forced circulation cooling type transformer according to the present invention comprises a transformer main body comprising an iron core and a coil, and cooling the transformer main body. An insulating cooling medium, a tank for storing the transformer main body and the insulating cooling medium, and a partition plate for dividing the inside of the tank into an upper part and a lower part. The transformer main body is forcibly circulated in the tank. In the forced circulation cooling type transformer for cooling the plate, a shield plate for sealing a gap between the partition plate and the tank wall is attached to the partition plate, and the shield plate is formed by an elastic plate.

In order to achieve the above object, another configuration of the forced circulation cooling type transformer according to the present invention is characterized in that a shield plate for sealing a gap between the partition plate and the tank wall is attached to the partition plate. The shield plate is formed by joining an elastic plate and a non-elastic plate.

[0015] In order to achieve the above object, a still further invention of a forced circulation cooling type transformer according to the present invention is characterized in that the partition plate is provided with a shield plate for sealing a gap between the partition plate and the tank wall surface. The shield plate is formed by an elastic plate and a non-elastic plate, and the elastic plate is made longer than the non-elastic plate to make contact with the tank wall.

According to another aspect of the present invention, a shield plate is fixed to an upper part of the partition plate so as to be bent upward from the partition plate. Things.

According to another aspect of the present invention, a shield plate is fixed to a lower portion of the partition plate so as to be bent downward from the partition plate. Things.

[0018]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional view of a first embodiment of a forced circulation cooling type transformer according to the present invention, and FIG. 2 is an enlarged view of a shield plate portion. In FIG. 1, a tank 4 contains a transformer body 5 composed of a coil 5a and an iron core 5b, and an insulating cooling medium 6 (insulating gas or oil). This insulating cooling medium 6 serves as a cooling medium for heat,
(Or a pump) for releasing the heat generated from the transformer main body 5 to the outside through the heat exchanger 7. The inside of the tank 4 is separated into an upper part and a lower part by the partition plate 3. Around the partition plate 3, a shield plate 1 for sealing a gap generated between the partition plate 3 and the tank wall surface 4a is arranged.

As shown in FIG. 2, the shield plate 1 is formed of an elastic rubber plate, is fixed to the upper portion of the partition plate 3 by insulating bolts 2 so as to be bent upward from the partition plate 3, and has a free end formed on the tank wall. It is fixed so as to be pressed against 4a. As the material of the elastic rubber plate, for example, acrylonitrile-butadiene rubber, polysulfide-based synthetic rubber, fluorine rubber and the like can be used.

With the above configuration, even if the shield plate 1 is deformed, it tends to return to the original shape, that is, the position shown by the broken line due to the resilience of the material. For this reason, the shield plate 1 is always in close contact with the tank wall surface 4a, and it is possible to prevent the occurrence of a clearance between the shield plate 1 and the tank wall surface 4a, and to prevent the insulating cooling medium 6 from leaking. As a result, as shown by the solid line in FIG.
Since all of the insulating cooling medium 6 flows toward the transformer main body 5, the cooling efficiency is improved. In addition, there is no fear that the shield plate 1 vibrates to generate abnormal noise due to the collision between the shield plate 1 and the tank wall surface 4a.

FIG. 3 shows a second embodiment of the shield plate according to the present invention. In this embodiment, the shield plate 1 shown in FIG.
Is fixed below the partition plate 3 so as to be bent downward from the partition plate 3. With the above configuration,
The same effect as that of the embodiment shown in FIG.
Is pressed against the tank wall surface 4a, and the adhesion between the shield plate 1b and the tank wall surface 4a is improved. The greater the pressure difference, the better the adhesion.

FIG. 4 shows a third embodiment of the shield plate structure according to the present invention. In this embodiment, the shield plate is an elastic plate 1
a and an inelastic plate 1b (for example, a press board) in this order, and the two are joined with an adhesive (they may be fixed with screws or the like). The shield plate formed by bonding is fixed to the upper part of the partition plate 3 by the insulating bolt 2 so as to be bent upward from the partition plate 3.

With the above configuration, the elastic rubber plate 1
Since a and the inelastic plate 1b are bonded with an adhesive, elasticity of the bent portion of the inelastic plate 1b can be secured. In addition, since the bending of the elastic rubber plate 1a and the inelastic plate 1b at the original position (shape) indicated by the broken line is smaller than the bending at the position (shape) indicated by the solid line after assembly, in the assembled state. The bent portion of the elastic rubber plate 1a is pulled, so that the tip of the inelastic plate 1b is always in close contact with the tank wall surface 4a, so that a clearance between the inelastic plate 1b and the tank wall surface 4a can be prevented.

FIG. 5 shows a fourth embodiment of the shield plate according to the present invention. In this embodiment, the elastic rubber plate 1a shown in FIG.
And a shield plate composed of a non-elastic plate 1b and fixed below the partition plate 3 so as to be bent downward from the partition plate 3.

With the above structure, the same effect as that of the embodiment shown in FIG. 4 can be obtained, and the shield plate is pressed against the tank wall surface 4a by the differential pressure generated by the flow of the insulating cooling medium 6, and the shield plate and the tank wall surface 4a Adhesion is improved.

FIG. 6 shows a fifth embodiment of the shield plate according to the present invention. In this embodiment, as in FIG. 4, the shield plate is superposed on the elastic plate 1a and the non-elastic plate 1b (for example, press board) in this order, and the two are joined with an adhesive (even if they are fixed by screws or the like). Good). The shield plate formed by bonding is fixed to the upper part of the partition plate 3 by the insulating bolt 2 so as to be bent upward from the partition plate 3. Further, the elastic plate 1a is longer than the non-elastic plate 1b, so that the elastic plate 1a comes into contact with the tank wall surface 4a.

With the above structure, the same effect as that of the embodiment shown in FIG. 4 can be obtained. In addition, since the elastic rubber plate 1a is slightly longer than the non-elastic press board 1b, the elastic rubber plate 1a is flexible. The tip comes into contact with the tank wall surface 4a, and the adhesion is further improved.

FIG. 7 shows a sixth embodiment of the shield plate according to the present invention. In this embodiment, the elastic rubber plate 1a shown in FIG.
And a shield plate composed of a non-elastic plate 1b and fixed below the partition plate 3 so as to be bent downward from the partition plate 3.

With the above configuration, the same effect as that of the embodiment shown in FIG. 6 can be obtained, and the shield plate 1 b is moved by the pressure difference caused by the flow of the insulating cooling medium 6.
a, and the adhesion between the shield plate 1b and the tank wall surface 4a is improved.

[0030]

According to the present invention, since the adhesion between the shield plate and the tank wall surface can be ensured, the flow of the insulating cooling medium from the gap between the shield plate and the tank wall surface can be prevented to improve the cooling efficiency. A forced circulation cooling type transformer can be provided.

Also, it is possible to provide a forced circulation cooling type transformer capable of preventing the vibration of the shield plate due to the flow of the insulating cooling medium from the gap.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a first embodiment of a forced circulation cooling type transformer according to the present invention.

FIG. 2 is an enlarged view of a shield plate portion of FIG.

FIG. 3 is an enlarged view of a second embodiment of the shield plate portion according to the present invention.

FIG. 4 is an enlarged view of a third embodiment of the shield plate portion according to the present invention.

FIG. 5 is an enlarged view of a fourth embodiment of the shield plate portion according to the present invention.

FIG. 6 is an enlarged view of a fifth embodiment of the shield plate portion according to the present invention.

FIG. 7 is an enlarged view of a sixth embodiment of the shield plate portion according to the present invention.

FIG. 8 is an enlarged view of a shield plate portion of a conventional forced circulation type transformer.

[Explanation of symbols]

 1: Shield plate 1a: Elastic plate 1b: Inelastic plate 2: Insulation bolt 3: Partition plate 4: Tank 4a: Tank wall 5: Transformer body 5a: Coil 5b: Iron core 6: Insulation cooling medium 7: Heat exchanger 8 : Blower (or pump)

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Kenichi Matsubara 1-1-1, Kokubuncho, Hitachi City, Ibaraki Prefecture F-term in the Electric Systems Division, Hitachi, Ltd. 5E050 CA03 CB03 CB10 HA06

Claims (5)

[Claims] 1. A transformer main body comprising an iron core and a coil, an insulating cooling medium for cooling the transformer main body, a tank for accommodating the transformer main body and the insulating cooling medium, and the inside of the tank being divided into an upper part and a lower part. A forced separation cooling type transformer for cooling the transformer main body by forcibly circulating the insulating cooling medium in the tank, comprising: a partition plate; and sealing the gap between the partition plate and the tank wall surface to the partition plate. A forced circulation cooling type transformer, wherein a shield plate is attached, and the shield plate is formed by an elastic plate. 2. A transformer main body comprising an iron core and a coil, an insulating cooling medium for cooling the transformer main body, a tank for accommodating the transformer main body and the insulating cooling medium, and the inside of the tank being divided into an upper part and a lower part. A forced separation cooling type transformer for cooling the transformer main body by forcibly circulating the insulating cooling medium in the tank, comprising: a partition plate; and sealing the gap between the partition plate and the tank wall surface to the partition plate. A forced circulation cooling type transformer, wherein a shield plate is attached, and the shield plate is formed by joining an elastic plate and an inelastic plate. 3. A transformer main body composed of an iron core and a coil, an insulating cooling medium for cooling the transformer main body, a tank for storing the transformer main body and the insulating cooling medium, and the inside of the tank being divided into an upper part and a lower part. A forced separation cooling type transformer for cooling the transformer main body by forcibly circulating the insulating cooling medium in the tank, comprising: a partition plate; and sealing the gap between the partition plate and the tank wall surface to the partition plate. A forced circulation cooling type transformer, wherein a shield plate is attached, the shield plate is formed by joining an elastic plate and a non-elastic plate, and the elastic plate is longer than the non-elastic plate to make contact with the tank wall. 4. The forced circulation cooling type transformer according to claim 1, wherein the shield plate is fixed to an upper portion of the partition plate so as to be bent upward from the partition plate. 5. The forced circulation cooling type transformer according to claim 1, wherein the shield plate is fixed to a lower portion of the partition plate so as to be bent downward from the partition plate.