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In-grid Demonstration of High-temperature Superconducting Cable
Ohya, Masayoshi,Ashibe, Yuichi,Watanabe, Michihiko,Yumura, Hiroyasu,Nakanishi, Tatsuo,Hirota, Hirofumi,Masuda, Takato,Ichikawa, Hiroshi,Mimura, Tomoo,Honjo, Shoichi,Hara, Tsukushi The Korean Institute of Electrical Engineers 2013 The Journal of International Council on Electrical Vol.3 No.2
In a national project that began in 2007, Tokyo Electric Power Company (TEPCO), Sumitomo Electric Industries (SEI) and Mayekawa Mfg. Corporation (MYCOM) aim to operate a 66 kV, 200 MVA HTS cable system in a power grid to demonstrate its reliability and stable operation. In order to verify the validity of the cable design, a 30 m HTS cable system was constructed and subjected to various tests. After the confirmation of the nominal current and voltage performance, a long-term operation test was performed to verify whether the HTS cable system is capable of handling the rated current and voltage for thirty years. A 250 m cable was manufactured for the in-grid demonstration, and shipping tests were successful. The cable system construction was completed at the Asahi substation (Yokohama, Kanagawa), and the in-grid demonstration will start in 2012.
Isomura, Yoshinori,Yamamoto, Kichiro,Morimoto, Shigeo,Maetani, Tatsuo,Watanabe, Akihiko,Nakano, Keisaku Journal of International Conference on Electrical 2014 Journal of international Conference on Electrical Vol.3 No.3
The voltage source PWM inverter generally used to drive the air conditioning (A/C) fans has been posing a large issue that the bearings in air conditioning fan motors are highly possible to be corroded electrically. Potential difference called shaft voltage is generated between inner and outer rings of the bearings due to inverter switching. The shaft voltage causes bearing lubricant breakdown dielectrically. As a result, bearing current is caused. This current causes the bearing corrosion. In previous work, we demonstrated that the shaft voltage can be reduced by using an insulator inserted between the outer and inner cores of the rotor in an air conditioning fan motor without grounding. This paper proposes the other countermeasure for reducing the shaft voltage in fan motors. The countermeasure which adds a capacitor between the brackets and the stator core is effective even for fan motors with non-insulated rotor. The effectiveness is confirmed by both simulated and experimental results.