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成果報告書詳細
管理番号20180000000145
タイトル*平成29年度中間年報 高温超電導実用化促進技術開発/高温超電導送配電技術開発/運輸分野への高温超電導適用基盤技術開発
公開日2018/6/26
報告書年度2017 - 2017
委託先名公益財団法人鉄道総合技術研究所
プロジェクト番号P16006
部署名省エネルギー部
和文要約
英文要約(1) Development of The Cooling Technique of Long Distance for Superconducting Cable
To establish a cooling technique of long distance, we have developed the fundamental technology for the main devices of the cooling system as shown below.
1. Development of a compact refrigerator
In order to realize high performance and compactness for the conventional Brayton refrigerator, the optimum layouts of the rotating machine, the heat exchanger and the piping were examined and the whole design of the refrigerator was carried out. The volume of the manufactured refrigerator is about 10 m3. We also designed and manufactured a circulation equipment for the refrigerator evaluation test.
2. Development of a liquid nitrogen circulation pump
We proceeded to manufacture the components of the liquid nitrogen circulation pump to which the dynamic pressure type gas bearing was applied. After assembly of the pump, a rotation test on it was conducted at the normal temperature, in the nitrogen atmosphere, and without load.
The amount of displacement of the gas bearing in the radial direction and that in the axial direction were less than the allowable value at the rated rotational speed, and the rotational stability was confirmed.
3. Development of the vacuum insulation pipes
We evaluated the performance of a short sample of vacuum insulation pipe and carried out the optimum structural design. We completed the fabrication of automatic winding devices of heat insulating material and spacer between inner pipe and heat insulating material aiming at the manufacture of long vacuum insulation pipe.
(2) Construction and Evaluation of Long Distance Cooling System
We have continued to design a long distance cooling system using the analysis software and have prepared and manufactured its components. We have developed the fundamental technology in the actual environment.
1. Evaluation assuming the actual environment
Structural design of a compact current lead was made using electric insulating material as a parameter. Regarding the shape of the electric insulating spacer, as a result of examination, it was found out that the electric field concentration can be relaxed and the miniaturization design of the current terminal can be effectively achieved by adopting the disk spacer at the flange contact portion and the cone spacer at the inlet port of the liquid nitrogen container.
2. Development of technique for system maintenance
We have developed a technique for system maintenance, in order to improve the system reliability by monitoring the conditions of the cooling system and the superconducting cable.
We have developed a method for determining the rotational frequency from the acceleration data by using the dynamic programming matching method for the inverter control equipment. We have developed a method to measure the position of the cable conductor in a noncontact manner from the outside of the superconducting feeder cable by some sensors arranged in the vacuum insulation pipes.
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