JPH05282944A - Gas bushing - Google Patents

Abstract

PURPOSE:To provide a gas bushing of light weight, an excellent explosion-proof property and high earthquake resistant property. CONSTITUTION:A gas bushing is provided with a hollow porcelain 10 filled with insulating gas therein, and a center conductor 5 disposed coaxially with the hollow porcelain 10 inside thereof. The hollow porcelain 10 is constituted of a cylindrical body 6 formed of a complex member of an inner cylinder 6a and an outer cylinder 6b, where one (e.g. the inner cylinder 6a) of the complex member is made of glass fiber reinforced plastic while the other (e.g. the outer cylinder 6b) is made of Aramid fiber reinforced plastic, and a cover 2 having a shed part 2a therearound and secured to the outer peripheral portion of the cylindrical body 6 in such a manner as to be integrated therewith.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas bushing which uses an insulating gas filled in an internal space of a porcelain insulator as an insulating medium.

[0002]

2. Description of the Related Art In recent years, the size of gas-insulated electrical equipment has been greatly reduced as compared with conventional equipment by using an insulating medium having an excellent insulating property, for example, an insulating gas such as SF6 gas. Bushings are no exception, and gas bushings that are more compact and easier to handle are desired in order to reduce the installation area and weight.

Although porcelain has been mainly used as a porcelain bushing material for the gas bushing in the past, in recent years, glass fiber reinforced plastics have been used instead of porcelain materials from the viewpoint of weight reduction. 2. Description of the Related Art A porcelain bushing having a structure in which a plastic cover formed in the shape of a shade is fixed to and integrated with the outer peripheral portion of a tubular body formed in step 1 has been used for gas bushings.

FIG. 3 shows the structure of a conventional gas bushing using glass fiber reinforced plastic as a porcelain tube material.

In this conventional gas bushing, in order to withstand the pressure of the insulating gas filled inside and the external force from the outside, the tubular body 1 is formed of glass fiber reinforced plastic,
A plastic cover 2 having a large number of cap portions 2a for securing a leakage distance and draining water is fixedly attached to the outer peripheral portion of the cylindrical body 1 to form a porcelain insulator 10. Further, an upper lid 3 and a lower lid 4 which are kept airtight are provided on the upper and lower portions of the porcelain bushing 10 through a seal packing or the like, and are further mechanically and electrically connected to the upper lid 3 and the center of the porcelain bushing 10 Central conductor 5 coaxially arranged at the position
Insulating gas such as SF6 gas is filled in the inner space 10a of the porcelain tube 10 to maintain the insulation of the charging part.

[0006]

In recent years, there has been a great demand for downsizing and weight reduction of equipment, and improvement of seismic performance is also required. From this point, it is lightweight and has high mechanical strength and damping against vibration. Although a gas bushing having good characteristics and good explosion-proof performance is required, in the conventional gas bushing in which the tubular body 1 which is a constituent element of the porcelain bushing 10 is made of only glass fiber reinforced plastic, the above-mentioned requirements are met. There was a problem that could not be satisfied.

The present invention has been made in consideration of the above points, and an object thereof is to provide a gas bushing which is lightweight, has high explosion-proof performance, and has good seismic performance.

[0008]

In order to achieve the above object, in the gas bushing of the present invention, a cylindrical body which is a constituent element of the porcelain insulator is composed of a composite material of an inner cylinder and an outer cylinder. One (for example, an inner cylinder) is formed of glass fiber reinforced plastic, and the other (for example, an outer cylinder) is formed of aramid fiber reinforced plastic.

[0009]

When the cylindrical body is made of a composite material of an inner cylinder and an outer cylinder, and one of the composite materials is made of glass fiber reinforced plastic and the other is made of aramid fiber reinforced plastic, the strength of the cylindrical body is improved. And the damping characteristic against vibration is improved.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIG. It should be noted that the same parts and parts having the same functions as those of the conventional gas bushing shown in FIG.

In the gas bushing of this embodiment, the cylindrical body 6 provided to withstand the pressure of the insulating gas filled inside and the external force from the outside is a plastic reinforced with glass fiber (called a reinforced plastic of glass fiber). It is composed of a composite material composed of an inner cylinder 6a formed by the above and an outer cylinder 6b formed by a plastic reinforced with aramid fiber (referred to as a reinforced plastic of aramid fiber). Further, a plastic cover 2 having a large number of cap portions 2a for securing a leak distance and draining water is fixed so as to be integrated with the cylindrical body 6 to form a porcelain insulator 10.

Then, upper and lower lids 3 and 4 which maintain airtightness are provided on the upper and lower portions of the porcelain bushing 10 through seal packing and the like, and the porcelain bushing is mechanically and electrically connected to the upper lid 3. A central conductor 5 is provided coaxially at the center position of 10, and an insulating gas such as SF6 gas is filled in the internal space 10a of the porcelain tube 10 where the airtightness of the insulator 10 is maintained. The structure keeps

According to the gas bushing of the above embodiment, the cylindrical body 6 which is a constituent element of the porcelain insulator 10 is formed of the inner cylinder 6a made of glass fiber reinforced plastic having high compressive strength.
And the outer tube 6b formed of aramid fiber reinforced plastic that is lighter in weight, stronger in tensile strength and excellent in vibration damping characteristics than glass fiber reinforced plastic, and thus is made of only glass fiber reinforced plastic. The gas bushing is lighter than the conventional gas bushing forming the cylinder, has improved strength, and has good vibration damping characteristics.

That is, since the cylindrical body 6 is composed of the composite material of the glass fiber reinforced plastic and the aramid fiber reinforced plastic as described above, it is lightweight and strong, has an excellent explosion-proof performance, and has a gas bushing. It is possible to provide a gas bushing having excellent vibration damping characteristics when shaken and excellent in earthquake resistance.

FIG. 2 shows a second embodiment in which the porcelain insulator structure according to the present invention is applied to a lightning arrester for a transmission line. The cylindrical body 6 in this arrester for power transmission line has the same structure as in the first embodiment.
Inner cylinder 6a made of glass fiber reinforced plastic
And an outer cylinder 6b made of reinforced plastic of aramid fiber, and has a large number of caps 2a around the outer circumference of the cylinder 6 for the purpose of securing a leak distance and draining water. The porcelain bushing 10 is constructed by fixing the plastic cover 2 so as to be integrated with the cylindrical body 6.

An upper lid 3 and a lower lid 4 which are kept airtight are disposed on the upper and lower portions of the porcelain bushing 10 with a seal packing or the like, and an insulating tube 8 is provided inside the porcelain bushing 10. The lightning arrester element 7 is stacked in multiple stages inside the tube 8, and the upper part thereof is mechanically and electrically connected to the upper lid 3 of the porcelain insulator 10,
The lower part is a lower cover 4 of the porcelain insulator 10 via a receiving plate 9 and a spring 11.
Is connected to the bearing. Then, the internal space where the airtightness of the porcelain insulator 10 is maintained (the internal space 10 partitioned by the insulating cylinder 8)
In b and 10c), nitrogen gas is enclosed as an insulating gas.

By constructing the transmission line arrester as described above, it is possible to make it light in weight and have improved strength and good vibration damping characteristics as in the gas bushing of the first embodiment. That is, by constructing the cylindrical body 6 from a composite material composed of an inner cylinder 6a made of glass fiber reinforced plastic and an outer cylinder 6b made of aramid fiber reinforced plastic, it is lightweight and strong, and has an anti-explosion performance and earthquake resistance. It is possible to provide a lightning arrester for a transmission line having excellent performance.

When used in applications where no bending load is applied, the weight can be further reduced by constructing the tubular body 6 entirely of aramid fiber reinforced plastic. Further, it can be used in an insulator for a power transmission line with the same configuration as that of the first embodiment, and the same effect as described above can be expected.

[0019]

As described above, according to the gas bushing of the present invention, it is lightweight and strong, has excellent explosion-proof performance, and has good vibration damping characteristics, so that it has excellent seismic performance. A gas bushing can be provided.

Further, when the gas bushing of the present invention is mounted on a substation device, for example, a gas circuit breaker, it is lighter than a conventional gas bushing, so that the center of gravity of the gas circuit breaker is lowered, and the gas bushing itself is earthquake-proof. Not only the performance is good, but it also has the effect of improving seismic performance as a gas circuit breaker.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a gas bushing showing a first embodiment of the present invention.

FIG. 2 is a sectional view showing a second embodiment in which the insulator structure of the present invention is applied to a lightning arrester for a power transmission line.

FIG. 3 is a sectional view showing the structure of a conventional gas bushing.

[Explanation of symbols]

 2 Cover 3 Upper lid 4 Lower lid 5 Center conductor 6 Cylindrical body 6a Inner cylinder made of glass fiber reinforced plastic 6b Outer cylinder made of aramid fiber reinforced plastic 7 Lightning arrester element 8 Insulation cylinder 9 Receiving plate 10 Insulator pipe 10a to 10c Insulating gas filled Insulated insulator internal space 11 Spring

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Akira Aoyagi 2-1, Ukishimacho, Kawasaki-ku, Kawasaki-shi, Kanagawa Stock company Toshiba Hamakawasaki factory

Claims (1)

[Claims] 1. A gas bushing comprising a porcelain insulator tube filled with an insulating gas and a central conductor coaxially arranged in the porcelain insulator tube, wherein the porcelain insulator tube is a composite material of an inner cylinder and an outer cylinder. A composite body made of reinforced plastic of glass fiber and one of the composite material made of reinforced plastic of aramid fiber; A gas bushing characterized by comprising a cover fixed so that