JP2021035111A - Gas insulation device - Google Patents

Abstract

To obtain a gas insulation device capable of higher voltage and smaller size without compromising the insulation performance of an insulating structural member that supports a center conductor.SOLUTION: A gas insulation device 10 includes: injection insulators 21, 22 that are fixed to a tank 4; first ceramic coatings 31, 33 partially provided on a portion of a surface of the injection insulators 21, 22 including a triple junction portion of the injection insulators 21, 22, a center conductor 1, and an insulating gas 90; second ceramic coatings 32, 34 partially provided on a portion of a surface of the injection insulators 21, 22 including the triple junction portion of the injection insulators 21, 22, the tank 4, and the insulating gas 90; and convex portions 5a, 5b, 5c provided between an area where the first ceramic coatings 31, 33 are provided and an area where the second ceramic coatings 32, 34 are provided in surfaces of the pouring insulators 21, 22.SELECTED DRAWING: Figure 1

Description

The present invention relates to a gas insulating device in which a central conductor is supported in a metal container filled with an insulating gas.

Conventionally, in a gas insulating device in which a central conductor is arranged in a metal container filled with an insulating gas, the central conductor is insulated and supported by a disk-shaped or columnar insulating structural member. On the surface of the insulating structural member, which is the surface straddling the central conductor and the metal container, an insulating coating for improving the insulating performance is applied by thermal spraying of ceramics.

When a ceramic coating is applied to the entire creeping surface of the insulating structural member, interfacial peeling or cracks occur in the ceramic coating due to the difference in the coefficient of thermal expansion between the ceramic coating and the insulating structural member, causing partial discharge or creeping flash. Was there.

Patent Document 1 discloses that ceramic spraying is partially applied to a place where an electric field is likely to be concentrated, such as a triple junction. The gas insulating device disclosed in Patent Document 1 can suppress the occurrence of interfacial peeling or cracks by partially setting the range of ceramic spraying.

Japanese Unexamined Patent Publication No. 11-273480

However, the gas insulating device disclosed in Patent Document 1 may lack the insulation performance when the device is increased in voltage or miniaturized, and it is difficult to increase the voltage and miniaturize the device.

The present invention has been made in view of the above, and an object of the present invention is to obtain a gas insulating device capable of increasing voltage and miniaturization without impairing the insulating performance of the insulating structural member supporting the central conductor. ..

In order to solve the above-mentioned problems and achieve the object, the present invention positions and supports a cylindrical tank filled with an insulating gas, a cylindrical center conductor, and a center conductor at the center of the tank. It has an insulating structural member. The insulating structural member includes an insulator fixed to the tank, an embedded electrode fixed to the insulator to support the central conductor, and a triple junction portion of the surface of the insulator, which is the insulator, the central conductor, and the insulating gas. A first ceramic coating partially provided on a part, and a second ceramic coating partially provided on a part of the surface of the insulator including the triple junction portion of the insulator, the tank, and the insulating gas. It includes a convex portion provided between a region of the surface of the insulator provided with the first ceramic coating and a region provided with the second ceramic coating.

According to the present invention, it is possible to obtain a gas insulating device capable of increasing the voltage and reducing the size without impairing the insulating performance of the insulating structural member supporting the central conductor.

Sectional drawing of the gas insulation equipment which concerns on Embodiment 1 of this invention Cross-sectional view of a disk-shaped insulating structural member of the gas insulating device according to the first embodiment. Side view of a disk-shaped insulating structural member of the gas insulating device according to the first embodiment Cross-sectional view of a columnar insulating structural member of the gas insulating device according to the first embodiment.

Hereinafter, the gas insulating device according to the embodiment of the present invention will be described in detail with reference to the drawings. The present invention is not limited to this embodiment.

Embodiment 1.
FIG. 1 is a cross-sectional view of the gas insulating device according to the first embodiment of the present invention. The gas insulating device 10 has a tank 4 which is a cylindrical metal container and a cylindrical central conductor 1. The center conductor 1 is arranged at the center of the tank 4. The central conductor 1 is positioned and supported by a disk-shaped insulating structure member 91 and a columnar insulating structure member 92. The inside of the tank 4 is filled with an insulating gas 90. Examples of the insulating gas 90 include SF ₆ gas, but the insulating gas 90 is not limited thereto. A flange 4a is provided at the end of the tank 4.

FIG. 2 is a cross-sectional view of a disk-shaped insulating structural member of the gas insulating device according to the first embodiment. In FIG. 2, only the portion of the insulating structure member 91 on one side of the central axis of the central conductor 1 is shown, and the drawing on the other side is omitted. FIG. 3 is a side view of a disk-shaped insulating structural member of the gas insulating device according to the first embodiment. The disk-shaped insulating structure member 91 is installed at a joint portion between the tanks 4 by being sandwiched between flanges 4a. The insulating structural member 91 includes a disk-shaped cast insulator 21 having a through hole 21c formed in the center, an embedded electrode 7 fixed to the cast insulator 21 while penetrating the through hole 21c, and cast insulation. It has convex portions 5a and 5b made of silicone resin installed on one surface 21a and the other surface 21b of the object 21, respectively. The central conductor 1 is supported by the embedded electrode 7. The cast insulator 21 is molded by pouring a resin, which is an insulator, into a mold. Here, the central conductor 1 is supported by using a cast insulator 21 molded by using a mold, but an insulator molded by a method other than molding by a mold is used instead of the cast insulator 21. It may be used to support the central conductor 1.

Each of one surface 21a and the other surface 21b of the casting insulator 21 is provided with a first ceramic coating 31 adjacent to the radially outer side of the tank 4 with respect to the embedded electrode 7. Therefore, a part of the surface of the cast insulator 21 including the triple junction portion 51 of the embedded electrode 7, the cast insulator 21, and the insulating gas 90 is covered with the first ceramic coating 31. Further, each of one surface 21a and the other surface 21b of the casting insulator 21 is provided with a second ceramic coating 32 adjacent to the flange 4a on the radial inner side of the tank 4. Therefore, a part of the surface of the cast insulator 21 including the triple junction portion 52 of the flange 4a, the cast insulator 21, and the insulating gas 90 is covered with the second ceramic coating 32. The first ceramic coating 31 and the second ceramic coating 32 are formed by low-temperature spraying at 150 ° C. or lower. Since the first ceramic coating 31 and the second ceramic coating 32 are formed by low-temperature spraying, peeling due to thermal stress can be less likely to occur.

The convex portion 5a is provided on a portion of one surface 21a of the casting insulator 21 between the first ceramic coating 31 and the second ceramic coating 32. The convex portion 5b is provided on the other surface 21b of the casting insulator 21 between the first ceramic coating 31 and the second ceramic coating 32. As shown in FIG. 3, the convex portions 5a and 5b are annular, and a polytetrafluoroethylene (PTFE) coating 6 is provided on the surface thereof. The convex portions 5a and 5b are fixed by being adhered to one surface 21a or the other surface 21b of the casting insulator 21.

Since the silicone resin, which is the material of the convex portions 5a and 5b, has a low elastic modulus and a small thermal stress at the adhesive interface, the convex portions 5a and 5b are cast insulators 21 even when the temperature inside the tank 4 rises. It can be prevented from peeling from.

FIG. 4 is a cross-sectional view of a columnar insulating structural member of the gas insulating device according to the first embodiment. The columnar insulating structure member 92 is fitted and installed in the branch pipe 4b of the tank 4. The insulating structural member 92 is installed on a columnar cast insulator 22, an embedded electrode 7a fixed to the end of the cast insulator 22 to support the central conductor 1, and a side surface 22 a of the cast insulator 22. It has a convex portion 5c. The cast insulator 22 is molded by pouring a resin, which is an insulator, into a mold. Here, the central conductor 1 is supported by using a cast insulator 22 molded by using a mold, but an insulator molded by a method other than molding by a mold is used instead of the cast insulator 22. It may be used to support the central conductor 1.

A first ceramic coating 33 is provided on the side surface 22a of the casting insulator 22 adjacent to the radial outer side of the tank 4 with respect to the embedded electrode 7a. Therefore, a part of the surface of the cast insulator 22 including the triple junction portion 53 of the embedded electrode 7a, the cast insulator 22, and the insulating gas 90 is covered with the first ceramic coating 33. Further, a second ceramic coating 34 is provided on the side surface 22a of the cast insulator 22 adjacent to the inside of the tank 4 in the radial direction with respect to the flange 4a. Therefore, a part of the surface of the cast insulator 22 including the triple junction portion 54 of the flange 4a, the cast insulator 22, and the insulating gas 90 is covered with the second ceramic coating 34. By forming the first ceramic coating 33 and the second ceramic coating 34 by low-temperature spraying at 150 ° C. or lower, peeling due to thermal stress can be less likely to occur.

The convex portion 5c is provided on the side surface 22a of the casting insulator 22 between the first ceramic coating 33 and the second ceramic coating 34. The convex portion 5c has a ring shape, and the casting insulator 22 penetrates therethrough. The convex portion 5c is made of a silicone resin, and a PTFE coating 6 is provided on the surface thereof. The convex portion 5c is adhered and fixed to the side surface 22a of the casting insulator 22.

Since the silicone resin, which is the material of the convex portion 5c, has a low elastic modulus and a small thermal stress at the adhesive interface, the convex portion 5c can be peeled off from the casting insulator 22 even when the temperature inside the tank 4 rises. Can be prevented.

A part of one surface 21a and the other surface 21b of the casting insulator 21 including the triple junction 51 of the embedded electrode 7, the casting insulator 21 and the insulating gas 90 is partially coated with the first ceramic coating 31. Is provided. Further, a second ceramic coating is partially applied to a part of one surface 21a and the other surface 21b of the casting insulator 21 including the triple junction portion 52 of the tank 4, the casting insulator 21 and the insulating gas 90. 32 is provided. Therefore, it is possible to prevent the cast insulator 21 from being damaged due to the electric field being concentrated on the cast insulator 21.

Further, a first ceramic coating 33 is partially provided on a part of the side surface 22a of the casting insulator 22 including the triple junction portion 53 of the embedded electrode 7a, the casting insulator 22, and the insulating gas 90. .. Further, a second ceramic coating 34 is partially provided on a part of the side surface 22a of the casting insulator 22 including the triple junction portion 54 of the tank 4, the casting insulator 22, and the insulating gas 90. Therefore, it is possible to prevent the cast insulator 22 from being damaged due to the electric field being concentrated on the cast insulator 22.

The first ceramic coatings 31, 33 and the second ceramic coatings 32, 34 are applied to one surface 21a of the casting insulator 21, the other surface 21b of the casting insulator 21, and the side surface 22a of the casting insulator 22. Since it is partially provided, it is possible to suppress the occurrence of interfacial peeling or cracking in the first ceramic coatings 31, 33 and the second ceramic coatings 32, 34.

By polishing the surfaces of the first ceramic coatings 31, 33 and the second ceramic coatings 32, 34 to reduce the surface roughness, the first ceramic coatings 31, 33 and the second ceramic coatings 32, The occurrence of partial discharge on the surface of 34 can be further reduced.

Further, since the convex portions 5a and 5b are provided on one surface 21a and the other surface 21b of the casting insulator 21, the convex portions 5a and 5b are provided for the creepage distance between the embedded electrode 7 and the tank 4. Increased than without. Similarly, since the convex portion 5c is provided on the side surface 22a of the casting insulator 22, the creepage distance between the embedded electrode 7a and the tank 4 is larger than that in the case where the convex portion 5c is not provided. Therefore, the gas insulating device 10 according to the first embodiment can be reduced in voltage and size while suppressing the occurrence of ground faults.

Silicone resin, which is the material of the convex portions 5a, 5b, 5c, has a low elastic modulus and a small thermal stress at the adhesive interface. It is possible to prevent peeling from the mold insulators 21 and 22.

Further, in the gas insulating device 10 according to the first embodiment, since the PTFE coating 6 is provided on the surfaces of the convex portions 5a, 5b, 5c, the insulating gas 90 makes the silicone which is the material of the convex portions 5a, 5b, 5c. It is possible to prevent the resin from deteriorating and the insulation performance from deteriorating.

In the above description, one convex portion 5a, 5b, 5c is provided on one surface 21a of the casting insulator 21, the other surface 21b of the casting insulator 21, and the side surface 22a of the casting insulator 22. However, two or more convex portions 5a, 5b, 5c are provided on one surface 21a of the casting insulator 21, the other surface 21b of the casting insulator 21, and the side surface 22a of the casting insulator 22, respectively. May be good.

The configuration shown in the above-described embodiment shows an example of the content of the present invention, can be combined with another known technique, and is one of the configurations without departing from the gist of the present invention. It is also possible to omit or change the part.

1 Center conductor, 4 tank, 4a flange, 4b branch pipe, 5a, 5b, 5c convex part, 6 PTFE coating, 7,7a embedded electrode, 10 gas insulation equipment, 21,22 cast insulation, 21a one side, 21b Other surface, 21c through hole, 22a side surface, 31,33 first ceramic coating, 32,34 second ceramic coating, 51,52,53,54 triple junction, 90 insulation gas, 91,92 insulation structure Element.

Claims (3)

A cylindrical tank filled with insulating gas and
Cylindrical center conductor and
It has an insulating structural member that positions and supports the central conductor at the center of the tank.
The insulating structural member is
The insulator fixed to the tank and
An embedded electrode fixed to the insulator to support the central conductor,
A first ceramic coating partially provided on a part of the surface of the insulator including the triple junction portion of the insulator, the center conductor, and the insulating gas.
A second ceramic coating partially provided on a part of the surface of the insulator including the triple junction portion of the insulator, the tank, and the insulating gas.
A convex portion provided between a region of the surface of the insulator provided with the first ceramic coating and a region provided with the second ceramic coating, and
Gas insulation equipment characterized by being equipped with. The insulator is disk-shaped and has a disk shape.
The gas insulating device according to claim 1, wherein the first ceramic coating and the second ceramic coating are provided on one surface and the other surface of the insulator, respectively. The insulator is columnar and has a columnar shape.
The gas insulating device according to claim 1, wherein the first ceramic coating and the second ceramic coating are provided on the side surface of the insulator.

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