JPH11288819A - Transformer and reactor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To maintain the same performance characteristic with high efficiency and to achieve the compact configuration by providing a heat radiating member, wherein the part is engaged with a coil with heat transfer relation and another part protrudes to the outer part of the coil. SOLUTION: A primary coil 14, in which a conducting wire is wound, and a secondary coil, wherein the conducting wire is wound at the outside, are provided around an iron core 12. An aramid-fiber sheet is arranged between the layers of the conducting wire for insulation. A heat sink 20, which also serves as an electrostatic shield, is arranged between the primary coil 14 and the secondary coil 16. In a transformer 10, the heat sink 20, in which the primary coil 14 is wound around a winding frame 30 into which the iron core 12 can be inserted without a gap and a heat radiating piece 32 is provided thereon, is arranged. Furthermore, the secondary coil 16 is wound thereon. Then, the iron core 12 is inserted into the winding frame 30. As the material of the heat sink 20, the nonmagnetic metal having the large thermal conductivity such as aluminum and copper is used. Therefore, the basic structure is not changed, the capacity can be made large, the repair is easy and the height does not become high as a whole.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to transformers (transformers, current transformers), reactors (blockage loops), etc. in which a conductor is wound around an iron core.
In particular, the present invention relates to transformers, reactors, and the like having high heat dissipation efficiency and small size and high capacity.

[0002]

2. Description of the Related Art Transformers, reactors, etc., in which a conductor is wound around an iron core, generate a large amount of heat. Being able is an important factor. Increasing the temperature due to the heat generated by the transformer / reactor shortens the life of the transformer / reactor and lowers the reliability. Therefore, in response to the demands for reducing the installation volume and installation area of electric devices and appliances, reducing the weight and lengthening the service life, miniaturization and weight reduction of transformers and reactors that maintain the same performance The realization of a high-capacity transformer or a reactor maintaining the same volume and the same weight is a strong demand in the art.

Conventionally, in order to maintain the temperature of a transformer, a reactor or the like at the time of operation at a predetermined temperature or less, the cross-sectional area of a conductor is increased to reduce the resistance, or forced air is blown from the outside. In addition to the natural heat radiation, a flow path is provided inside the conductor to circulate the cooling water.

[0004]

In the conventional configuration in which air is forcibly blown by a transformer, a reactor, or the like, the heat generating portion is the entire coil, the inside of the coil cannot be substantially cooled, and the heat is radiated. Efficiency was low and bulky transformers and reactors had to be used. In addition, the cross-sectional area of the coil must be increased, and it is inevitable that the coil becomes bulky. In addition, in a conventional structure in which a flow path is provided inside a conductor such as a transformer / reactor and the cooling water is circulated therein, the manufacturing cost of the transformer / reactor becomes extremely high, and maintenance and repair are very complicated. In addition, it was inevitable that the whole would become bulky.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of conventional transformers and reactors, and has a very high heat radiation efficiency and can be downsized while maintaining the same performance. The purpose is to provide vessels, reactors, etc. Another object of the present invention is to provide a transformer, a reactor, etc., whose basic structure is almost the same as that of the conventional one, whose capacity can be increased, maintenance and repair are easy, and which are not large and bulky as a whole.

[0006]

SUMMARY OF THE INVENTION The present invention relates to a transformer having a core wound with a conductor.
A transformer / reactor characterized in that a part of the reactor is engaged with the coil in a heat transfer relationship, and another part is provided with a heat radiating member that protrudes to the outside of the coil and radiates heat. Embodiments of the present invention are as follows. The heat transfer relationship of the heat radiating member is characterized in that the heat radiating member is configured to be pressed against the coil via an insulating sheet. The heat transfer relationship of the heat radiating member is characterized in that the heat radiating member is configured to be in pressure contact with the coil through an insulating coating. The heat radiating member is a metal interlayer member. The heat dissipation member,
It is characterized by having a heat pipe. The heat radiation member is a winding frame. The heat radiating member is an electrostatic shield plate. The heat dissipating member has a metal plate disposed in the coil and a tongue extending substantially outside the coil substantially integrally with the metal plate. The heat radiation of the heat radiation member is performed by self-cooling. The heat radiation of the heat radiation member is performed by forced air cooling. The heat radiation of the heat radiation member is performed by water cooling.

[0007]

Embodiments of the present invention will be described below with reference to transformer diagrams. [First Embodiment] As shown in FIG. 1, a transformer 10 according to a first embodiment comprises a primary coil 14 having a conductor wound inside and a secondary coil 16 having a conductor wound outside, around a core 12. And A sheet of aramid fibers (not shown) is placed between the layers of conductors for insulation. A radiator plate 20 also serving as an electrostatic shield is arranged between the primary coil 14 and the secondary coil 16. The more detailed structure of the transformer 10 is as follows.
As shown in FIG. 2, the primary coil 14 is wound around a winding frame 30 into which the iron core 12 can be inserted without any gap, and a heat radiating plate 20 provided with a heat radiating tongue 32 is disposed thereon.
6 is wound. The core 12 is inserted into the winding frame 30. The material of the heat radiating plate 20 is a non-magnetic metal having a high thermal conductivity such as aluminum and copper. The transformer 10 of the first embodiment performs self-cooling heat radiation by selecting the size and shape of the heat radiation tongue 32. Transformer 1 of the first embodiment
In order to further increase the heat radiation efficiency of FIG.
As shown in the figure, the heat sink 2 disposed between the coils 14 and 16
The number of zeros is increased, and the heat dissipating tongues 32 of each heat dissipating plate 20 are connected together to the water cooling pipe 42 via the connecting plate 40. [Second Embodiment] A transformer 100 according to a second embodiment is shown in FIG. 5, and the same components as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted. The heat radiating plate 120 is formed by bending a rectangular plate member, and the heat radiating tongue 32 of the first embodiment is formed.
A heat dissipating tongue piece 132 is provided corresponding to. Heat release tongue 13
2 is bent from the inner surface of the heat sink 20 to the outer surface and extends above the heat sink 120. The heat radiation tongue piece 132 is riveted to the heat radiation plate 20. [Third Embodiment] A transformer 200 according to a third embodiment is shown in FIG. 6, and the same components as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted. A member corresponding to the heat sink 20 of the first embodiment is not provided, and the winding frame 230 functions as a heat sink. That is, the winding frame 230 has the heat radiation protrusion 232 extending to a position higher than the coil 216. [Experimental example 1] 11. For one phase of three-phase alternating current in primary coil
53 KVA was charged. The current flowing through the primary coil is 10
The current flowing through the secondary coil at 0 A was 57.67 A, and the voltage at the secondary coil was 200 V. When the heat sink was not arranged in the coil, the saturation temperature (for the temperature rise) of the highest temperature rise portion was 133 ° C. No heat dissipating tongue on the bobbin
A heat sink with a heat dissipation tongue made of copper plate with insulating sheets on both sides between the first and second layers of the secondary coil, and insulated on both sides as an electrostatic shield between the primary and secondary coils A heat sink with a heat dissipation tongue made of copper plate with a seat is arranged,
A heat radiating plate made of a copper plate and having a heat radiating tongue having insulating sheets on both surfaces was disposed between the first layer and the second layer of the secondary coil. Heat radiation tongues All heat radiation tongues were water cooled. The saturation temperature (the rising temperature) of the highest temperature rising portion was 75.8 ° C. [Experimental example 2] The same transformer as in Experimental example 2 was used. 13.33 KVA was supplied to the primary coil for one phase of three-phase alternating current. The current flowing through the primary coil was 115.5 A, the current flowing through the secondary coil was 66.67 A, and the voltage of the secondary coil was 200 V. When the heat sink is not arranged in the coil, the saturation temperature (for the temperature rise) of the highest temperature rise portion is 174.
° C. No heat dissipating tongue is provided on the winding frame.
A heat radiating plate made of a copper plate having an insulating sheet disposed on both sides between the first layer and the second layer was disposed, and an insulating sheet was disposed on both sides as an electrostatic shield between the primary coil and the secondary coil. A heat radiating plate with a heat radiating tongue made of a copper plate was arranged, and a heat radiating plate with a heat radiating tongue made of a copper plate having an insulating sheet disposed on both surfaces between the first layer and the second layer of the secondary coil was arranged. Heat radiation tongues All heat radiation tongues were water cooled. The saturation temperature (for the rising temperature) of the highest temperature rising portion was 103.7 ° C.

[0008]

According to the transformer, the reactor and the like of the present invention, it is possible to obtain an effect that the heat radiation efficiency is very high, and the same performance can be maintained and the size can be reduced. According to the transformer / reactor of the present invention, the basic structure is almost the same as the conventional one, the capacity can be increased, the maintenance and repair are easy, and the transformer / reactor which does not become large and bulky as a whole is further improved. It has an effect that can be configured.

[Brief description of the drawings]

FIG. 1 is a perspective view of a transformer according to a first embodiment of the present invention.

FIG. 2 is an exploded perspective view of the transformer according to the first embodiment of the present invention.

FIG. 3 is a perspective view of a cooling unit according to the first embodiment of the present invention.

FIG. 4 is a side view of the cooling unit according to the first embodiment of the present invention.

FIG. 5 is a perspective view of a transformer according to a second embodiment of the present invention.

FIG. 6 is an exploded perspective view of a transformer according to a third embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Transformer 12 Iron core 14 Primary coil 16 Secondary coil 20 Heat dissipation plate 30 Reel 32 Heat dissipation tongue 40 Connecting plate 42 Water cooling pipe

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI H01F 31/00 R (72) Inventor Kazuhei Tamura 2-6-112 Senju Midoricho, Adachi-ku, Tokyo Inside Kyoritsu Electric Co., Ltd.

Claims (11)

[Claims] In a transformer / reactor in which a conductor is wound on an iron core, a part of the transformer / reactor is engaged with a coil in a heat transfer relationship,
A transformer / reactor characterized in that a heat radiating member for radiating heat by projecting outside the coil is provided. 2. The transformer according to claim 1, wherein a heat transfer relationship of the heat radiating member is configured by pressing the heat radiating member to the coil via an insulating sheet.
Reactor. 3. The transformer / reactor according to claim 1, wherein a heat transfer relationship of the heat radiating member is configured by pressing the heat radiating member to the coil via an insulating coating. 4. The transformer / reactor according to claim 1, wherein the heat radiating member is a metal interlayer member. 5. The transformer / reactor according to claim 1, wherein the heat radiating member has a heat pipe. 6. The transformer / reactor according to claim 1, wherein the heat radiating member is a bobbin. 7. The transformer / reactor according to claim 1, wherein the heat radiating member is an electrostatic shield plate. 8. The heat radiating member according to claim 1, wherein the heat radiating member has a metal plate disposed inside the coil and a tongue extending substantially outside of the coil while being substantially integrated with the metal plate. Transformers and reactors. 9. The transformer / reactor according to claim 1, wherein the heat radiation of the heat radiation member is performed by self-cooling. 10. The transformer according to claim 1, wherein the heat radiation of the heat radiation member is performed by forced air cooling.
Reactor. 11. The transformer / reactor according to claim 1, wherein the heat radiation of the heat radiation member is performed by water cooling.