JP2766760B2 - Gas insulated induction appliance - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas-insulated induction device.

[0002]

2. Description of the Related Art A conventional gas-insulated induction device is disclosed in
As described in Japanese Patent Publication No. 126613, a plurality of windings arranged concentrically are all constituted by molded coils.

[0003]

In the above prior art, since a plurality of windings are all formed by molded coils, there is a problem such as partial discharge in a molded portion when used for high voltage windings. .

In addition, since a plurality of windings arranged concentrically are all formed by molded coils, each winding must be manufactured individually, and after manufacturing, an inner winding (inner winding) is formed. ) Involves the insertion of an outer winding (outer winding), which requires a great deal of manufacturing time for adjusting the gap between the inside and the outside.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and has as its object to provide a gas-insulated induction device which has a good cooling efficiency, can cope with a high voltage, and can be easily manufactured. Things.

[0006]

An object of the present invention is to form an inner winding disposed on the iron core side by a molded coil made of a semi-cured prepreg material, and to form an outer winding disposed outside the molded coil by a plastic. This is achieved by forming a winding composed of electric wires using a film.

[0007]

Since the above means is provided, the occurrence of partial discharge between the inner winding and the outer winding is suppressed, and the outer winding can be manufactured by using the inner winding as a winding form.

[0008]

Next, the present invention will be described in detail with reference to examples.

[Embodiment 1] FIGS. 1 to 3 show an embodiment of the present invention. Outer windings 3 </ b> A, 3 </ b> A are housed in a tank 1 and are concentrically wound around an iron core 2.
B, a gas-insulated induction device in which the tank 1 is filled with the gas 4. In this embodiment, the inner winding 3 A arranged on the iron core 2 side is a molded coil made of a semi-cured prepreg material 3 a _1. The outer winding 3B formed outside the molded coil is formed by a plastic film 3b.
It was formed by winding constructed ₁ wire 3b ₂ using. By doing so, the occurrence of partial discharge between the inner winding 3A and the outer winding 3B is suppressed, and the outer winding 3B can be manufactured using the inner winding 3A as a winding form. In this way, the outer winding 3B is inserted into the inner winding 3A after the manufacturing, so that there is no need to adjust the gap between the inner and outer sides, and the cooling efficiency can be improved, the high voltage can be handled, and the manufacturing can be facilitated. The obtained gas-insulated induction device can be obtained.

That is, an inner winding 3A composed of a molded coil around an iron core 2 and a plastic film 3b
Is composed of an outer winding 3B consisting wire 3b ₂ using _1, it is accommodated in the tank 1, an inert gas 4, such as SF ₆ is filled as an insulating medium and the cooling medium. Since the inner winding 3A is constituted by molded coil, a robust against buckling force at the time of external short circuit, and the electric wire 3 is an outer winding 3B using plastic film 3b ₁
because it is composed in b _2, as in the conventional outer winding 3B
In this case, it is possible to stably cope with a high voltage without causing a problem of occurrence of partial discharge in a high-voltage winding generated when a molded coil is used.

Further, depending on the material constituting the molded coil, the electric wire 3b ₂ using the plastic film 3b ₁
Since the heat-resistant grade can be higher than the insulation type of the outer winding 3B, the temperature limit of the inner winding 3A can be set higher, the heat-resistant specification can be supported, the size can be reduced, and the cooling device 5 can be used. A compact, lightweight, and compact gas-insulated induction device can be obtained.

Further, in the case where the inner and outer molded coils are formed separately as in the prior art, the inner and outer molded coils are separately manufactured. Insulation cylinders are required to ensure the insulation of the coil, and it is necessary to combine the coils after separately manufacturing the molded coils.However, by increasing the thickness of the mold part of the inner mold coil, No insulating cylinder is required. That is, the inner winding 3
The outer coil 3B can be wound in multiple stages by using the mold coil A as a coil, and not only the coil for the outer coil 3B becomes unnecessary, but also the assembling work after the coil is manufactured becomes unnecessary. Note Figure 1, the 3a ₂ 2 wires of the inner winding 3A, 3b ₃ is wire, 3b ₄ constituting the electric wire 3b ₂ of the outer winding 3B spacer, 6 denotes a cover, 7 is a yoke.

As described above, according to this embodiment, it is possible to obtain a small-sized gas-insulated induction device which has good cooling efficiency, can cope with a high voltage, and is easy to manufacture. It can be effectively used as a small-scale, large-capacity disaster-prevention gas-insulated induction device used in substations installed in the country.

Embodiment 2 FIG. 4 shows another embodiment of the present invention. It should be noted that only the inner winding and the outer winding shown in FIG. The outer winding 3B ₁ is formed into a cylindrical winding an electric wire 3b ₂ using plastic film and formed so as cylindrical windings as its height on the outside than on the inside becomes smaller in this embodiment. In this way, the gas 4 in the tank (see FIG. 1) is
Is easy passes between the windings of B _1, thereby improving the cooling efficiency.

That is, in a gas insulated induction device using a gas as a cooling medium, the heat capacity of the gas is small, so that the cooling effect is poor and the size of the cooler tends to be inevitably increased.
Since the outer winding 3B ₁ composed of wire 3b ₂ using plastic film and a cylindrical winding, can reduce the pressure loss in the windings, it becomes possible to increase the gas flow rate, improving cooling efficiency can do.

[Embodiment 3] FIG. 5 shows still another embodiment of the present invention. It was placed shield 8 having the same potential as the outer winding 3B ₂ of the cylindrical winding inside the prepreg material 3a ₁ constituting the inner winding 3A ₁ in this embodiment. By doing so, the inner winding 3 is larger than in the case described above.
Can reduce the insulation distance between the A ₁ and the outer winding 3B _2, it can be miniaturized induction apparatus.

[0017] That Inside the outer winding side of the semi-cured state prepreg material 3a ₁ mold coil comprising an inner winding 3A _1, was placed shield 8 having a potential of the outer winding 3B _2. Insulation between the inner winding 3A ₁ and the outer winding 3B ₂ by doing so is solid insulation, and an outer winding 3
Since B ₂ is a cylindrical winding, it can be reduced insulation distances between the windings. In this case, the problem of partial discharge is completely eliminated by attaching a shield for alleviating the electric field to the winding end of the molded coil or the end of the shield 8, so that it is possible to cope with a large-capacity, high-voltage gas-insulated transformer.

[Embodiment 4] FIG. 6 shows still another embodiment of the present invention. To form an outer winding 3B ₃ a cylindrical winding coated therearound with an insulating material 9 in this embodiment. By doing so, the outer winding 3B is larger than the case described above.
₃ is firmly fixed by the insulating material 9, so that the mechanical strength can be improved.

That is, the outer winding 3B covered with the insulating material 9
_The formation of No. ₃ makes it possible to strengthen against the electromagnetic mechanical force at the time of external short circuit, and also to improve the heat resistance grade of the insulation of the coated outer winding 3B ₃ and to increase the temperature of the inner winding 3A. not only the allowable limit, the temperature tolerance limit of the outer winding 3B ₃ can also be set high, can support heat-resistant, further reduction in size, downsizing of the cooler is achieved, compact gas insulated induction apparatus in size and weight Can be manufactured.

[0020]

As described above, according to the present invention, the inner winding disposed on the iron core side is formed of a molded coil made of a semi-cured prepreg material, and the outer winding disposed outside the molded coil is formed of plastic. Since it was formed with a winding composed of electric wires using a film, the occurrence of partial discharge between the inner winding and the outer winding is suppressed, and the outer winding can be manufactured by using the inner winding as a winding form. Therefore, it becomes unnecessary to adjust the gap between the inside and the outside by inserting the outside winding into the inside winding after manufacturing as in the conventional case, so that the cooling efficiency can be improved, the high voltage can be handled, and the manufacturing is facilitated. This makes it possible to obtain a gas-insulated induction device that enables this.

[Brief description of the drawings]

FIG. 1 is a perspective view of a main part of an induction device according to an embodiment of the present invention.

FIGS. 2A and 2B also show an embodiment, wherein FIG. 2A is a perspective view of a main part of the induction device, and FIG. 2B is a perspective view of an A-frame portion of FIG.

FIG. 3 is a vertical sectional side view of the inner and outer winding portions of the embodiment.

FIG. 4 is a vertical sectional side view of inner and outer winding portions of another embodiment of the gas-insulated induction device of the present invention.

FIG. 5 is a vertical sectional side view of inner and outer winding portions of still another embodiment of the gas-insulated induction device of the present invention.

FIG. 6 is a vertical sectional side view of inner and outer winding portions of still another embodiment of the gas-insulated induction electric device of the present invention.

[Explanation of symbols]

1: tank, 2: iron core, 3A, 3A ₁ ... inner winding, 3a ₁
... semi-cured prepreg _{material, 3B, 3B 1, 3B 2} , 3B
₃ … outer winding, 3b ₁ … plastic film, 3b ₂ …
Electric wire using plastic film, 4 ... gas (SF
₆ gas).

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yoshitake Kashima 1-1-1, Kokubuncho, Hitachi City, Ibaraki Prefecture Inside the Kokubu Plant, Hitachi, Ltd. (72) Inventor Kaoru Endo 7-chome, Omikacho, Hitachi City, Ibaraki No. 1 in the Hitachi Research Laboratory, Hitachi, Ltd. (58) Field surveyed (Int. Cl. ⁶ , DB name) H01F 27/20 H01F 27/28 H01F 27/32 H01F 27/36

Claims (1)

(57) [Claims] 1. A gas-insulated induction electric device which is housed in a tank and is wound concentrically around an iron core and has an outer winding, wherein the tank is filled with gas. Is formed by a molded coil of a semi-cured prepreg material, and the outer winding disposed outside of the molded coil is formed by a winding composed of an electric wire using a plastic film. A gas-insulated induction device, characterized in that: