JPH07161539A - Amorphous wound core transformer - Google Patents

Abstract

PURPOSE:To prevent core chips of an amorphous wound core from scattering without the sacrifice of the magnetic characteristics. CONSTITUTION:The amorphous wound core transformer comprises a core coating vessel 60 covering the entire circumference of an amorphous wound core 20 except the coil 10. The core coating vessel 60 has the inner space slightly larger than the core 20 so that the core 20 can move slightly.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an iron core (hereinafter, referred to as
It is called "amorphous winding iron core". ) Is included in the transformer.

[0002]

2. Description of the Related Art Oil-immersed transformers have been mainly studied for winding amorphous material ribbons having excellent magnetic properties into multiple layers and using the wound ribbons for iron cores of power transformers. In an oil-filled transformer, a coil and an iron core are usually immersed in insulating oil in a closed tank for protection and heat dissipation.

In the formation of an amorphous winding iron core, a plurality of laminated amorphous ribbons are wound into an annular shape and then annealed to remove the stress caused by the winding. For this reason, the amorphous wound iron core is very brittle, and an end portion of the iron core may be damaged due to an impact during transportation or use, and fragments of the amorphous material ribbon may be scattered. Since the amorphous magnetic material has a larger specific gravity than oil, the scattered fragments settle in the tank, which causes the dielectric breakdown of the coil.

Therefore, in the prior art, Japanese Patent Laid-Open No. 63-1
As disclosed in Japanese Patent No. 33609 and Japanese Patent Laid-Open No. 64-68921, a method of fixing a coating material to a part of the surface of the iron core to prevent the iron core from being damaged is adopted.

[0005]

By the way, during operation of the transformer, the amorphous winding iron core tries to expand due to heat generation. However, in the above conventional technique, since the coating material is fixed to a part of the surface of the iron core, when the iron core expands, a local stress is generated in the wound iron core, the iron loss increases, etc. There is a problem that it worsens.

The present invention has been made in view of the above-mentioned conventional problems, and an amorphous winding iron core transformer capable of preventing the discarding of the insulation of the coil without deteriorating the magnetic characteristics of the winding iron core. The purpose is to provide.

[0007]

An amorphous winding iron core for achieving the above object comprises an iron core coating container that covers the entire circumference of the amorphous winding iron core without covering the coil, and the iron core coating container has the amorphous core inside. It is characterized in that the winding core is formed so as to be slightly movable, and the inner space thereof is formed slightly larger than the amorphous winding core.

Here, it is preferable that an inert gas or insulating oil is enclosed in the iron core coating container. In addition, the coil and the tank provided with the amorphous winding iron core provided in the iron core coating container are provided, and when the tank is filled with insulating oil, the iron core coating container has an outer space thereof. It is also possible to form an oil passage that penetrates through the inner space and has a diameter of a specific size or less.

In the amorphous winding iron core transformer, it is preferable that the iron core coating container is made of an insulating material. Further, it is preferable that an elastic material is arranged between the inner surface of the iron core coated container and the amorphous wound iron core provided in the iron core coated container. In addition, the amorphous winding iron core has a ring shape, and when an end surface that is flat and perpendicular to the center axis of the ring is formed, the amorphous winding iron core is arranged so that the end surface faces the vertical direction. Preferably.

[0010]

In the amorphous wound iron core, the entire circumference thereof is covered with the iron core coating container, and since the iron core fragments can be prevented from scattering, the dielectric breakdown of the coil or the like due to the iron core fragments can be prevented. Also, the iron core is not fixed to the iron core coated container and can move to some extent in the container, so even if the iron core expands due to heat generation during transformer operation, the iron core can expand freely. It is possible to prevent a local stress from being generated. Therefore, the deterioration of the iron core characteristics of the amorphous wound iron core can be prevented.

Furthermore, since the entire circumference of the amorphous winding iron core is covered with the iron core coating container, noise generated by magnetostrictive vibration can be reduced.

[0012]

EXAMPLES Various examples of the amorphous winding core transformer according to the present invention will be described below. First, a first embodiment of the amorphous winding core transformer according to the present invention will be described with reference to FIGS.

The amorphous winding core transformer of this embodiment is
As shown in FIGS. 2 and 3, two annular coil bodies 10 and 10 formed by winding an electric wire and an annular coil body 1 are provided.
An annular amorphous winding iron core 20 that connects the two coil bodies 10, 10 through the insertion window 15 of 0, an iron core coating container 60 that covers the entire circumference of the iron core 20, and the coil body 10,
10 and a support metal fitting for supporting the amorphous winding iron core 20 covered with the iron core coating container 60, a tap changer 30 for stepwise changing the transformation ratio, and a tank 50 in which insulating oil 59 is filled and which contains these components. And is configured.

As shown in FIG. 4, the amorphous wound core 20 comprises a plurality of laminated amorphous ribbons 21, 21 ,.
Is formed into a ring shape. In the formation of the amorphous wound iron core 20, usually, a plurality of amorphous ribbons 21, 21, ... Are wound into an annular shape and then annealed in order to remove stress caused by the winding. Then, as shown in FIG. 5, the annealed material is once unwound to form a U shape, and the coil body 10 is inserted from the end portion of the U shape, that is, the abutting portion 22, and then the opened iron core 20a is again inserted. It is wound.

As shown in FIGS. 1 and 4, an iron core coating container 60 for covering the amorphous winding iron core 20 has a rectangular tubular body covering material 61, 6 for covering the body 29 of the annular iron core 20.
1 and the outer peripheral side 26 of the curved portion 25 of the annular iron core 21.
And the curved portion covering members 62, 62 for covering the end face side, and the iron core 21.
Inner peripheral portion covering member 6 covering the inner peripheral side 27 of the curved portion 25 of
3, 63. Connection protrusions 64, 64, ... Are formed at the ends of the straight body covering material 61. Also,
The curved portion covering material 62 includes the connecting convex portion 6 of the straight body portion covering material 61.
Connection recesses 65, 65, ... into which the 4, 64, ... are fitted are formed. Each of the coating materials 61, 62, 63 is formed such that the inner space of the iron core coating container 60 formed by combining these is larger than that of the iron core 20. That is, the iron core coating container 60 is formed large so that the iron core 20 can move to some extent inside. In addition, each coating material 6
1, 62 and 63 are made of epoxy resin having an insulating property.

Now, the procedure for assembling the covering materials 61, 62, 63 will be described. First, as shown in FIG. 5, an electric wire is wound around the rectangular tubular covering member 61 to form the coil body 10. That is, the straight body covering material 61 is used as the inner mold of the coil body 10. Therefore, it is not necessary to separately prepare the inner die of the coil body 10 and remove the coil body 10 from the inner die, so that the efficiency of the assembling work can be improved. On the other hand, as described above, the iron core 20 is annealed and unwound once to be in a U-shape. Then, the straight body portion 29 of the iron core 20a is inserted into the straight body portion covering material 61 around which the coil body 10 is wound from the U-shaped end portion 22 of the iron core 20a that has been opened. Then, the opened iron core 20a is rewound to form the annular iron core 20. Next, as shown in FIG. 1, the curved portion covering material 62 is attached to the straight body portion covering material 61 so that the connecting concave portion 65 of the curved portion covering material 62 fits into the connecting convex portion 64 of the straight body portion covering material 61. Install. continue,
The inner peripheral portion covering material 63 is attached to the curved portion covering material 62. Finally, an adhesive agent is applied to the connection portions of the coating materials 61, 62, 63 to connect the coating materials to each other.

In the present embodiment, the end faces 16a and 16b of the two coil bodies 10 and 10 to which the amorphous winding iron core 20 is mounted are oriented in the vertical direction, and the end faces 16a and 16b of the two coil bodies 10 and 10, respectively. It is arranged in the tank 50 so that the vertical positions of the 16b coincide with each other. Upper end faces 16a, 1 of the two coil bodies 10, 10
6a includes an upper end face 16 of each of the two coil bodies 10, 10 extending in a direction perpendicular to the upper end face 16a.
Upper coil support plates 41, 41 are provided so as to straddle a and 16a. The upper coil support plates 41, 41 are 2
It has one sheet and is arranged so as to be parallel to each other. These two upper coil support plates 41, 41 are connected by an upper support plate connecting tool 42. Upper support plate connector 4
Reference numeral 2 denotes a groove-shaped portion corresponding to side walls 42a, 4
Upper coil support plates 41, 41 are fixed to 2a. In addition, the lower end face 16 of the two coil bodies 10, 10
Similarly to the upper end surface 16a, two lower coil support plates 43, 43 are also provided on b and 16b. Further, the two lower coil support plates 43, 43 are connected by a groove-shaped lower support plate connecting tool 44. Upper coil support plate 41
The lower coil support plate 43 and the connecting bolt 4
They are connected by 5. Groove-type upper support plate connector 42
The tank mounting bracket 46 is attached to the portion corresponding to the bottom wall (here, it is located above the portion corresponding to the side wall) 42b. The tank mounting bracket 46 is
A groove-shaped portion 46b corresponding to the bottom wall thereof is fixed to a portion 42b corresponding to the bottom wall of the upper support plate connector 42. The portions 46a, 46a corresponding to the side walls of the groove-shaped tank mounting bracket 46 are, as shown in FIG.
It is in contact with the inner wall and is fixed to the tank 50 by screws 47 here. That is, the two coil bodies 10, 10, the iron core 20, and the metal fittings 41, 42, ... Are fixed in the tank 50 in a suspended state by the tank mounting metal fitting 46. A tap changer 30 is provided above the tank mounting bracket 46. In addition, the above-mentioned support metal fittings are coil support plates 41 and 43, support plate connecting tools 42 and 4.
4, a connecting bolt 45, and a tank mounting bracket 46.

As described above, in the present embodiment, since the entire circumference of the amorphous winding iron core 20 is covered with the iron core coating container 60, even if a part of the brittle amorphous winding iron core 20 is missing,
The fragments do not scatter into the insulating oil 59. Therefore, the dielectric breakdown of the coil body 10 and the tap changer 30 can be prevented. In addition, in the present embodiment, since the entire circumference of the amorphous winding iron core 20 is covered with the iron core coating container 60, there is also an effect of reducing noise generated by magnetostrictive vibration of the amorphous winding iron core 20. Furthermore, amorphous winding iron core 2
Since 0 is cut off from the outside air, the amorphous winding iron core 20
Anti-corrosion effect can be expected. Amorphous winding iron core 2
In order to enhance the rust preventive effect of 0, it is preferable that an inert gas or insulating oil is enclosed in the iron core coating container 60.

Further, since the core-covered container 60 has an inner space slightly larger than the amorphous core 20 so that the amorphous core 20 can slightly move inside, the amorphous core 20 is generated by heat generation. When trying to expand, the amorphous winding core 20 can freely expand, and no local stress is generated in the amorphous winding core 20. Therefore, the deterioration of the iron core characteristics of the amorphous wound iron core 20 can be prevented.

In the present embodiment, the iron core coated container 6
Although 0 is formed of an insulating material, it may be formed of a conductive steel plate. However, in this case, it is necessary to provide an insulating material at least at one place of the iron core coating container so that an electric circuit of one turn is not formed around the iron core 20. Further, it is also necessary to attach insulating paper or the like to the portion of the container on which the coil body is wound so that the coil body wound around the outer periphery of the container does not cause dielectric breakdown in the steel sheet forming the iron core covered container.

Further, the present embodiment is an oil-filled transformer in which the coil body 10 and the iron core 20 are housed in the tank filled with the insulating oil 59, but the present invention is not limited to this. Alternatively, the present invention may be applied to a dry type transformer in which the tank is not filled with oil.

Next, a second embodiment of the amorphous winding core transformer according to the present invention will be described with reference to FIGS. 6 and 7. In this embodiment, the constituent members of the iron core coated container 60 in the first embodiment are slightly modified. As shown in FIGS. 6 and 7, the iron core coated container 60a of the present embodiment is
Rectangular tubular straight body portion covering members 61a, 61a that cover the straight body portion 29 of the annular iron core 20, and outer peripheral portion covering members 62a, 62a that cover the outer peripheral side 26 of the curved portion 25 of the annular iron core 21;
The bending portion 25 of the iron core 21 has bending portion covering materials 63a and 63a that cover the inner peripheral side 27 and the end face side. That is, in the present embodiment, the inner peripheral side 27 of the bending portion 25 of the iron core 20 and the end face side of the bending portion 25 together with the bending portion covering material 63.
a, 63a. Therefore, the curved portion 2 of the iron core 20
It is not necessary to attach a small member that covers only the inner peripheral side 27 of 5 to the narrow portion, and the workability of assembling the container 60a can be improved.

Next, a third embodiment of the amorphous winding core transformer according to the present invention will be described with reference to FIGS. 8 and 9. The amorphous winding iron core transformer of this embodiment is shown in FIG.
As shown in, the end face 2 of the annular amorphous winding core 20
The iron core 20 is placed so that 8a and 28b face the vertical direction, and as shown in FIG.
A cushioning material 67 having elasticity is arranged between the lower end surface 28b of the above and the lower inner wall 66 of the iron core covered container 60. The cushioning material 67 is made of a soft silicone resin.

As described above, in the present embodiment, the cushioning material 67 is provided between the lower end surface 28b of the iron core 20 and the lower inner wall 66 of the iron core covered container 60, that is, at the portion where the iron core 20 and the iron core covered container 60 are in contact with each other. Since it is arranged, the amorphous winding iron core 20
The magnetostrictive vibration can be suppressed, and as a result, noise due to the magnetostrictive vibration can be reduced.

Generally, when the annular amorphous winding iron core is placed on a flat surface, the contact area with the flattest surface becomes large when the end surface of the iron core faces downward, depending on the shape of the iron core itself. Therefore, as in the present embodiment, the amorphous winding iron core 2
When the 0 end surface 28b is directed downward, the contact area with the cushioning material 67 is increased, and the magnetostrictive vibration of the amorphous wound core 20 can be suppressed more effectively. Further, the self-weight of the amorphous winding iron core 20 is applied to the lower end surface 28b having a large contact area with the cushioning material 67.
Stress due to its own weight is dispersed, and deterioration of iron core characteristics can be prevented.

Even when the end faces 28a and 28b of the amorphous wound iron core 20 are not oriented vertically as in this embodiment, that is, when the end faces 28a and 28b are oriented horizontally as in the first embodiment, the iron core 20 It is preferable to dispose a cushioning material at a portion where the core coating container 60 and the iron core coating container 60 are in contact with each other.

Next, a fourth embodiment of the amorphous winding core transformer according to the present invention will be described with reference to FIG. In this embodiment, an iron core coated container 60b is provided with this container 60.
A plurality of oil passages 69 that penetrate from the outer space of b to the inner space of the container are formed. By the way, the iron core coated container 60
Since b is to prevent the fragments of the iron core 20 provided inside from scattering, the fragments of the iron core 20 are scattered to the outside of the container through the oil passage 69. Is not preferable. Therefore, the inner diameter of the oil passage 69 needs to be equal to or smaller than the size that most of the iron core fragments do not pass through. Therefore, it is considered preferable that the inner diameter of the oil passage 69 is, for example, about 2 to 3 mm.

According to this embodiment, the insulating oil 59 outside the iron core coated container 60b enters the container 60b through the oil passage 69, so that the inside of the iron core coated container 60b is filled with the insulating oil 59. It is possible to prevent the amorphous winding iron core 20 from rusting.

[0029]

According to the present invention, the amorphous winding iron core is covered with the iron core coating container, so that scattering of the iron core fragments can be prevented. Therefore, it is possible to prevent dielectric breakdown of the coil or the like due to the iron core fragments. Also, the iron core is not fixed to the iron core coated container and can move to some extent in the container, so even if the iron core expands due to heat generation during transformer operation, the iron core can expand freely. It is possible to prevent a local stress from being generated. Therefore, it is possible to prevent the deterioration of the core characteristics of the amorphous winding core.

Further, in the present invention, since the entire circumference of the amorphous winding iron core is covered with the iron core coating container, noise generated by magnetostrictive vibration can be reduced.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of an iron core coated container according to a first embodiment of the present invention.

FIG. 2 is a sectional view of the amorphous winding core transformer of the first embodiment according to the present invention.

FIG. 3 is a perspective view of a coil and its supporting metal fittings according to the first embodiment of the present invention.

FIG. 4 is a front view of an amorphous winding iron core.

FIG. 5 is an explanatory diagram showing a process of forming an amorphous winding iron core and a process of assembling an iron core coated container according to the first embodiment of the present invention.

FIG. 6 is a perspective view of a main part of an amorphous winding core transformer according to a second embodiment of the present invention.

FIG. 7 is an exploded perspective view of an iron core coated container according to a second embodiment of the present invention.

FIG. 8 is a perspective view of a main part of an amorphous winding core transformer according to a third embodiment of the present invention.

9 is a sectional view taken along line IX-IX in FIG.

FIG. 10 is a perspective view of the essential parts of an amorphous winding core transformer of a fourth embodiment according to the present invention.

[Explanation of symbols]

10 ... Coil body, 20 ... Amorphous winding iron core, 30 ... Tap changer, 50 ... Tank, 59 ... Insulating oil, 60, 60
a, 60b ... Iron core coated container, 67 ... Buffer material, 69 ... Oil passage.

Claims (3)

[Claims] 1. An amorphous winding core transformer in which a coil is mounted on an amorphous winding iron core formed by winding a ribbon of amorphous material in multiple layers, and the entire circumference of the amorphous winding iron core is covered without covering the coil. An iron core coating container is provided, wherein the iron core coating container has an amorphous winding core in which the amorphous winding iron core is slightly movable, and the inner space is formed to be slightly larger than the amorphous winding iron core. Iron core transformer. 2. The amorphous core transformer according to claim 1, wherein an inert gas or insulating oil is enclosed in the iron core coating container. 3. A coil formed by winding an electric wire, an amorphous winding core formed by winding a plurality of amorphous material ribbons in multiple layers to form a magnetic circuit of the coil, and the amorphous winding core without covering the coil. An iron core coating container that covers the entire circumference, and a tank that is filled with insulating oil and that accommodates the coil and the amorphous winding iron core provided in the iron core coating container are provided. The amorphous winding iron core is slightly movable, the inner space thereof is formed slightly larger than the amorphous winding iron core, and an oil passage having a diameter of a specific size or less is formed from the outer space to the inner space. Amorphous winding iron core transformer.