2019 Fiscal Year Final Research Report

On-Board Radio Sensing Techniques for Diagnosing Insulation Deterioration of Ground Coils of Superconducting Maglev Systems

Research Project

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Project/Area Number	17K06302
Research Category	Grant-in-Aid for Scientific Research (C)
Allocation Type	Multi-year Fund
Section	一般
Research Field	Power engineering/Power conversion/Electric machinery
Research Institution	The University of Tokushima
Principal Investigator	KAWADA Masatake 徳島大学, 大学院社会産業理工学研究部(理工学域), 教授 (00303686)
Project Period (FY)	2017-04-01 – 2020-03-31
Keywords	超電導磁気浮上式鉄道 / 地上コイル / 推進コイル / 浮上・案内コイル / 絶縁劣化診断 / 部分放電 / 電磁波センシングシステム / ベクトル型アンテナ
Outline of Final Research Achievements	In superconducting magnetic levitation (Maglev) systems, superconducting magnets are located on both sides of the vehicles and ground coils are attached to sidewalls of the guideway; the vehicles are levitated, guided, and propelled over the guideway by the electromagnetic force between them. Because a partial discharge (PD), which is a degradation symptom of insulating resin of the ground coils, emits wideband electromagnetic (EM) waves, a radio sensing system for locating the PD source by receiving the EM waves has been developed. In this study a radio interferometer system with a vector-antenna was developed. The experimental results showed the relationship between the PD current and the EM waves emitted from it. Partial discharges generated in a mock-up of propulsion coil could be detected from a test bogie running at the speed of 200km/h using the radio interferometer system with a vector-antenna.
Free Research Field	電気電子工学
Academic Significance and Societal Importance of the Research Achievements	超電導磁気浮上式鉄道の地上コイルは，車両の推進，浮上，案内を実現するための設備であり，実運用では膨大な数の地上コイルが使用される。地上コイルには長期間の機械的，電気的，環境的負荷が複合的に加わることから，地上コイルの絶縁破壊事故を未然に防ぐために，絶縁劣化予兆現象（部分放電）の早期発見が必要となる。本研究では超電導磁気浮上式鉄道の走行車両から地上コイル（推進コイル）の絶縁劣化の予兆現象である部分放電を検出するためのベクトル型電波干渉計システムを開発した。同システムを試験台車に搭載し，試験台車の時速200km走行中において部分放電を検出することができることを示した。