JPH07201609A - Non-inflammable transformer - Google Patents

Abstract

PURPOSE:To enhance the cooling performance by bringing the cooling face of a core into tight contact with a cooling panel on the opposite sides through an elastic sheet or a rubber paste mold thereby improving the contacting state with the cooling face of core and transmission of heat. CONSTITUTION:A core 1 is tightened in the stacking direction by means of core tightening metals 2 arranged on the opposite sides in the stacking direction. A cooling panel 4 applied with adhesion layers 3 on the opposite sides is disposed in the center of the core 1 in the stacking direction. The cooling panel 4 comprises corrugate fins for feeding an non-inflammable cooling liquid and spacer bars for ensuring the strength sandwiched by panels through a brazing material. It is then subjected to hot press and a coupling flange is welded to the upper part of the panel. The cooling panel is brought into tight contact with the cooling face of core through an elastic sheet 10, e.g. a rubber sheet.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an incombustible transformer, and more particularly to an iron core cooling device using a cooling panel.

[0002]

2. Description of the Related Art In consideration of disaster prevention, it is important to make a transformer incombustible. As an incombustible structure, gas insulation using SF ₆ gas is promising, but it is necessary to improve cooling performance in order to increase the capacity.

For this reason, for example, as shown in FIG. 3, an insulating container 23 and an iron core cooler 24 are provided in the winding part 21 and the iron core part 22 which are heat sources, and the upper pipe 25 and the lower part are provided in the insulating container 23 of each phase. A non-flammable insulating cooling liquid is circulated through the pipe 26 and from the inlet and the outlet of the iron core cooler 24 to respective heat dissipation devices (not shown). The transformer body (contents) including the winding portion 21 and the iron core portion 22 is placed on a support base 28 in a tank 27, and the tank 27 is filled with an insulating gas.

FIG. 4A is an overall view of the cooling panel 4 constituting the iron core cooler 24, FIG. 4B is a side view, and FIG. 5 is a sectional view of the cooling panel 4. In FIGS. 4 is a corrugated fin 5 for flowing the non-combustible insulating cooling liquid
The spacer bar 6 for securing the strength is sandwiched between the panels 8 via the brazing material 7, joined by pressure and heating, and then welded to the connecting flange 9 on one surface of the panel 8. This cooling panel 4 is inserted at a predetermined position between the laminations of the magnetic steel plates forming the iron core 1 via insulating paper, and the non-combustible insulating cooling liquid is circulated to remove heat generated by iron loss.

[0005]

However, in such a conventional structure, the cooling panel 4 is formed in a thin plate shape (about 7 mm) in order to prevent an increase in the cross-sectional size of the iron core 1, and the brazing material 7 is used for heating and joining. Therefore, the surface of the cooling panel 4 is likely to be distorted such as waviness and warpage.

Further, since each member is brazed,
Even if pressure is applied to correct, it is difficult to obtain good flatness. This flatness is a fairly bad value, usually about ± 2 mm, and when sandwiched between the core laminations in this state, a void is created on the contact surface, resulting in insufficient heat transfer,
Sufficient cooling performance cannot be obtained.

The present invention has been made in view of the above points, and by making the temperature distribution of the iron core uniform,
An object of the present invention is to provide an incombustible transformer equipped with an iron core cooling device having good cooling performance.

[0008]

In order to achieve the above object, an iron core cooling device for a non-combustible transformer according to the present invention is provided with adhesive layers on both surfaces of a cooling panel (whether an elastic sheet such as rubber is sandwiched, Alternatively, a resin-based or rubber-based insulating material is molded to form a thin groove) and is closely attached to the iron core cooling surface.

[0009]

In the structure of the present invention, since the cooling panel is adhered to both sides of the cooling panel via the elastic sheet or the rubber paste mold, the contact state with the cooling surface of the iron core is good and the heat transfer is good. As a result, the cooling performance is improved, and since the material forming the adhesion layer is an insulator, the insulating paper that has been conventionally inserted becomes unnecessary.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a plan view of an essential part showing an embodiment of an iron core cooling device for a non-combustible transformer according to the present invention, and FIG. 2 is a front view of the essential part of FIG. 1. In FIGS. Are fastened in the stacking direction by the iron core fastening fittings 2 arranged on both sides of the. Then, in the central portion of the iron core 1 in the stacking direction,
A cooling panel 4 provided with an adhesion layer 3 on both surfaces is arranged.

In the first embodiment, the structure of the cooling panel 4 is the same as the conventional example (FIGS. 4 and 5), and the cooling panel 4 secures strength with the corrugated fins 5 for flowing the non-combustible insulating cooling liquid. The spacer bar 6 for sandwiching is sandwiched between the panels 8 via the brazing filler metal 7, pressure-heated and joined, and then the connection flange 9 is welded to the upper portion of the panel 8.
As shown in FIG. 1, on both surfaces of the elastic sheet 1 made of rubber or the like.
It is in close contact with the cooling surface of the iron core with 0 sandwiched.

In the second embodiment, the structure of the cooling panel 4 is the same as that of the conventional example (FIGS. 4 and 5), and both surfaces of the cooling panel 4 are adhered to each other with a thin film molded with resin or silicone rubber paste. It is arranged as 3.

The case where the cooling panel 4 is arranged only at one central portion of the iron core 1 in the laminating direction has been described above. However, depending on the size of the iron core of the transformer, the cooling panels 4 are arranged at a plurality of places in the laminating direction. Also in this case, the cooling panel 4 has the same structure.

[0015]

As described above, according to the iron core cooling device for a non-combustible transformer of the present invention, (1) the contact state between the cooling panel and the iron core surface is improved, so that the heat transfer is improved and the iron core cooling performance is improved. Is improved.

(2) The transformer can be miniaturized by improving the cooling performance.

(3) Since the material forming the adhesion layer is an insulator, the insulating paper conventionally inserted is not required, and the iron core can be downsized.

Excellent effects such as the above can be obtained.

[Brief description of drawings]

FIG. 1 is a plan view of a main part showing an embodiment of an iron core cooling device for a nonflammable transformer of the present invention.

FIG. 2 is a front view of a first main part.

FIG. 3 is a cross-sectional view showing a basic structure example of a large capacity gas insulated transformer.

FIG. 4 is an overall view and a side view showing an example of a cooling panel of an iron core cooling device for a transformer.

FIG. 5 is a sectional view of a main part of a hydraulic panel.

[Explanation of symbols]

 1 ... Iron core 2 ... Iron core tightening fitting 3 ... Adhesion layer 4 ... Cooling panel 5 ... Corrugated fin 6 ... Spacer bar 7 ... Brazing material 8 ... Panel 9 ... Connection flange 10 ... Elastic sheet

Claims (3)

[Claims] 1. The winding insulating container and the iron core cooler communicate with a heat dissipation device outside the tank, respectively, and the winding insulating container communicates with the heat dissipation device via an upper pipe and a lower pipe. And the iron core cooler circulates a non-combustible insulating cooling liquid between the iron core cooler and the heat dissipation device through the inlet and the outlet thereof, and the transformer main body including the winding and the iron core and the like of the support base in the tank. In a non-combustible transformer that is placed on top of the tank and accommodated in the tank together with insulating gas, an adhesion layer is provided on both surfaces of the cooling panel of the cooler that is arranged at a predetermined position of the iron core. A nonflammable transformer characterized by being closely attached to the cooling surface of the iron core. 2. The nonflammable transformer according to claim 1, wherein the adhesion layer is an elastic sheet. 3. The non-combustible transformer according to claim 1, wherein the adhesion layer is a thin film formed by molding a resin-based or rubber-based insulating material.