JPH01198230A - Superconduction electric equipment - Google Patents

Abstract

PURPOSE:To remove possibility of insulation breakdown, and to improve insulation in a superconducting electric equipment by securely hanging the equipment composed of an oxide superconductive material by a central conductor of a bushing for input/output in a vessel filled with liquid nitrogen. CONSTITUTION:The inside of a vessel 6 forming a vacuum 7 together with a vessel 10 is filled with liquid nitrogen for cooling, and a superconductive conductor 9 is housed therein. The superconductive conductor 9 is hung directly by support jigs 11 for the central conductors 1a, 1b of bushing 2a, 2b for input/ output and fastened. Insulating spacers 4, 5 are interposed to the sections where the central conductors 1a, 1b penetrate the vessels 6, 10. Accordingly, insulating supporters 12 which are liable to insulation breakdown are omitted, thus improving insulation in an equipment.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Field of Application) The present invention relates to superconducting electrical equipment using oxide superconducting materials, and particularly to supporting insulation inside the equipment.

(Conventional technology) The application of superconductors to power equipment has been studied for a relatively long time, and recently, along with the development of AC superconducting wires, research into the application of superconductors to AC electrical equipment such as transformers has also begun. It's progressing. However, there are various technical problems in putting it into practical use.

This is due to the fact that conventional devices using superconducting materials such as NbTi and Nb3Sn, which are designed to be cooled by liquid helium, require the ultimate technology of freezing at extremely low temperatures, making them impractical in terms of economy and reliability. One of the major reasons is that it has been a bottleneck in the

However, recently, the development of oxide-based high-temperature superconductors has progressed rapidly, and the discovery of materials such as YBa2Cu30□-X, which exhibits the characteristics of superconductors such as zero electrical resistance and complete diamagnetic properties above liquid nitrogen temperature, has been reported in various places. .

When such high-temperature superconducting materials are used, liquid nitrogen etc. can be used as a refrigerant, which not only reduces the cost of the refrigerant itself, but also makes refrigeration technology much easier, making it not only economical but also highly reliable. It is expected that this technology will lead to rapid progress in its application to power equipment.

However, devices that cool superconducting conductors by immersing them in liquid nitrogen have the following problems.

(Problem to be Solved by the Invention) When forming a superconducting electrical device by installing a superconductor in a container filled with liquid nitrogen, there is a gap between the container at ground potential and the superconductor at high potential. Requires supporting insulation. - An example is shown in FIG. In FIG. 3, a superconducting conductor 9 is placed electrically suspended in a container 10 filled with liquid nitrogen 8 with a support insulator 12. Furthermore, a vacuum is created between the containers 10 and 6 to form a thermally insulating structure. Superconducting conductor 9
Both ends of .

The center conductors 1a and lb inside the bushings 2a and 2b are connected to devices outside the device. Center conductor 1a, l
Between b and containers 6 and 10, the center conductor 1 is fixed and liquid nitrogen 8 is
゜Insulating spacers 4 and 5 are used to seal the vacuum 7.

In this structure, the support insulator I2 between the superconducting conductor 9 at high potential and the vessel 10 at ground potential requires a sufficient creepage insulation i-. That is, a long insulation distance is required. However, in order to downsize the entire device, the space between the superconducting conductor 9 and the container 10 must be made as small as possible.

In order to meet this requirement, the supporting insulation structure must be designed to the utmost limit, but this is unreasonable and remains an area where insulation is unstable. It was necessary to improve the insulation method for this part.

The present invention was made to solve these problems, and aims to provide a superconducting electric device having a sufficient supporting and insulating structure.

[Structure of the invention]

(Means and effects for solving the problem) The supporting and insulating structure of equipment using superconducting conductors is such that the superconducting conductor is suspended by the center conductor of the input/output bushing, and the supporting insulating part is eliminated.

(Example) An embodiment of the invention is shown in FIG.

In the figure, a superconducting conductor 9 is installed in a container 10 filled with liquid nitrogen 8, and the structure in which input and output are drawn from both ends of the superconducting conductor 9 through a central conductor 1 in a bushing 2 is the same as that shown in FIG. It's the same. In the present invention, both ends of the superconducting conductor 9 are suspended by the bushing center conductors 1a and lb, and the supporting insulator between the superconducting conductor 9 and the container 10 is eliminated. This eliminates the creeping insulation of the support insulation, which has been a problem in the past. An example of a method of supporting the superconducting conductor 9 with the center conductor 1 is shown in FIG. 2. As shown in FIG.
is coupled to the center conductor 1 of the bushing. With such a configuration, both ends of the superconducting conductor 9 are fixed. Of course, the superconducting conductor 9 has an integral structure that allows the whole to float by supporting both ends.

By adopting such a structure, it is possible to eliminate supporting insulating parts that have insufficient insulation inside the superconducting equipment. Thereby, insulation can be strengthened.

Note that the present invention is not limited to the above-mentioned embodiments, and similar effects can be obtained with any structure supported by the center conductor of the bushing.

〔Effect of the invention〕

As explained above, according to the present invention, by creating a structure in which the superconducting conductor in a container filled with liquid nitrogen is suspended and supported by the center conductor of the bushing, support insulation of the superconducting conductor, which was previously an area where insulation was unstable, is achieved. You can lose things. Thereby, the insulation inside the superconducting electrical device can be improved, and a highly reliable superconducting electrical device can be provided.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing one embodiment of the present invention, and FIG. 2 is a sectional view showing an embodiment of the present invention.
FIG. 3 is a front view showing details of an embodiment of the present invention, and a cross-sectional view showing a conventional superconducting electric device. la, lb...center conductor 2a, 2b...bushing 3...insulating medium 4...insulating spacer 5...insulating spacer 6...container 7...vacuum 8...liquid nitrogen 9...
・Superconducting conductor 10...Container 11...Support jig 12...Supporting insulator Agent Patent attorney Noriyuki Chika Ken Yudo Ken Daishimaru Figure 1 Figure 2

Claims (1)

[Claims] In a superconducting electrical device in which a superconducting conductor made of an oxide superconducting material having a critical temperature of liquid nitrogen is cooled by immersing it in a container filled with liquid nitrogen, the superconducting conductor is suspended and fixed by the center conductor of an input/output drawer bushing. A superconducting electrical device characterized by: