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成果報告書詳細
管理番号20170000000136
タイトル*平成28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2017/5/10
報告書年度2016 - 2016
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 on the main devices of the cooling system consisting of a refrigerator, a liquid nitrogen pump, vacuum insulated pipes, etc.
1. Development of a compact refrigerator
We have optimized the cooling capacity and the efficiency of the cooling system by tuning the parameters relating to a turbo compressor and an expander of a Brayton refrigerator. We have designed the layout of the devices, the thermal exchanger and the pipes using the parameters in order to realize a compact refrigerator. The rotational performances were optimized by CFD aerodynamics and FEM structural analysis.
2. Development of a liquid nitrogen circulation pump
Dynamic pressure bearings which are able to maintain the generated force when a pump operates has been designed. To satisfy both the axial holding force and the reliability, new designed bearings are arranged concentrically around the conventional bearing. The pump impeller and the motor are designed on an intermediate target. Pump axis is designed so as not to exceed its natural frequency of the bending. Some components have been manufactured.
3. Development of the vacuum insulation pipes
We have started manufacturing and evaluating a short samples of which the structure of multi-layer insulation etc. are varied. We have also studied a cleansing method for eliminating oil content using mass spectroscopy of outgas generated from the pipes under various washing conditions.
An automated insulation wrapping device, a washing and drying device and a spacer wrapping device were manufactured based on the study results for developing the manufacturing technique for long vacuum insulation pipes.
(2) Construction and Evaluation of Long Distance Cooling System
We have started to design a long distance cooling system using the analysis software and have prepared and manufactured its components. We have developed the fundamental technology on the actual environment.
1. Evaluation assuming the actual environment
To realize compact current leads, we have investigated an electrical insulation method, and have built a numerical analysis program and a model expressing the internal electric field.
2. Development of technique on system maintenance
We have developed a technique on system maintenance, in order to improve the system reliability by monitoring conditions of the cooling system and the superconducting cable.
To detect a trouble of a bearing with abnormally located with cooled temperature from the measuring point of the room temperature apart from the bearing at a distance, a signal processing optimized by genetic algorithm was developed.
With respect to detection of a trouble on superconducting cable inside the vacuum insulating pipes, such as partial breakage or misarrangement, it have been proved that we are principally able to diagnose degradation or to monitor thermal contraction.
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