JPS6131931B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the structure of a gas bushing, and is intended to improve withstand voltage characteristics and economical efficiency.

In order to improve the withstand voltage characteristics of gas bushings, it is sufficient to arrange two or more shield rings for electric field improvement coaxially with the center conductor, but the present invention provides an economical and highly reliable method for this purpose. This is what we are trying to achieve through this method.

The drawing shows one embodiment of the present invention, and in the drawing, 1 is an insulator tube, 2 and 3 are center conductors installed inside the insulator tube 1, and 4 and 5 are terminals and terminals provided at both ends of the insulator tube 1. The shield 6 is a post-shaped insulating spacer made of cast resin that is installed between the center conductors 2 and 3, and this insulating spacer 6 has a plurality of legs (two in the figure) around the center metal fitting 6a. The second shield ring 7 is supported by the legs at a constant distance from the center conductors 2 and 3.

Note that the center metal fitting 6a of the spacer 6 and the center conductor 2 are coupled with a bolt 8, and the center conductor 3 on one side is coupled with a screw. These joining methods may include shrink fitting, welding, and the like. on the other hand,
The shield ring 7 is attached to the end fitting 6b of the spacer 6 by a shield fitting 9.

Further, the post-shaped insulating spacer 6 supporting the shield ring 7 may be provided at only one place, and it depends on the size and weight of the shield ring 7 and also on the vibration resistance required of the bushing itself. Further, the size and distance of each of the shield rings 7 and 5 are determined by how the center conductor and the capacitance between each other are set.

Furthermore, the legs of the post-shaped insulating spacer 6 are
In the figure, the insulating spacer has two legs, but it may have one leg or three or more legs, and the gap prevents foreign matter from accumulating on the legs of the insulating spacer, thereby preventing deterioration of insulation performance due to foreign matter. The cross-sectional shape of the legs can be any round or square shape, and in order to prevent the electric field from concentrating near the center metal fitting 6a of the post-shaped insulating spacer 6, the conductors 2 and 3 connected to the center metal fitting 6a are
It is effective to make part or all of the diameter larger than the diameter of the center fitting 6a. A gas bushing of this type is attached to the container 10 of a gas insulated appliance, but a conical insulating spacer may be interposed therebetween for the gas chamber.

Furthermore, it is also possible to improve the electric field near the end fitting 6b and the shield fitting 9 by improving the shape of the shield ring 7.

As described above, according to the present invention, by using the post-shaped insulating spacer, the withstand voltage performance of the gas bushing can be improved, and moreover, it is possible to provide a gas bushing that is economical and has excellent insulation reliability.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the present invention, and FIG. 2 is a sectional view taken along the - line in FIG. In the figure, 1 is an insulator tube, 2 and 3 are center conductors, 6 is an insulating spacer, 6a is a center metal fitting, 6b is an end metal fitting, 7 is a shield ring, 8 is a bolt, and 9 is a shield metal fitting.

Claims (1)

[Scope of Claims] 1. An insulator tube, a conductor arranged coaxially inside the insulator tube and divided into a plurality of pieces in the length direction, and a conductor that is inserted and coupled between these conductors and together with the conductor constitutes the center conductor of the bushing. A post-shaped insulating spacer consisting of a central metal fitting, one or more legs arranged around the central metal fitting, and an electric field improving shield supported by the legs of the insulating spacer. Gasbutsing. 2. The gas bushing according to claim 1, wherein the shield ring is supported by a plurality of insulating spacers. 3. The gas bushing according to claim 1 or 2, wherein the diameter of part or all of the conductor coupled to the central metal fitting of the insulating spacer is set larger than the diameter of the metal fitting.