Faculty Profiles - OHTSUKA Shinya

Papers - OHTSUKA Shinya

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Fast Quench of Superconducting Wire by Pulsed Current and its Application to Pulsed Power Generator Reviewed

J.Suehiro,K.Tsutsumi,D.Tsuji,S.Ohtsuka,K.Imasaka,M.Hara

Proc. of the 11th International Symposium on High-voltage Engineering 5 390 - 393 1999.04

Frequency Spectrum Characteristics of PD Electromagnetic Waves in GIS Measured by UHF Sensors Reviewed

S.Ohtsuka,K.Takenaka,M.Hikita

Proc. of 1999 Japan - Korea Joint Symposium on Electrical Discharge and High Voltage Engineering 269 - 272 1999.04

Measurements and Location Identification of Partial Discharge in Dry-type Metalized Polypropylene Film Capacitor Reviewed

Y.Makino,S.Ohtsuka,Z.H.Tian,T.Hirota,M.Hikita

Proc. of 1999 Japan - Korea Joint Symposium on Electrical Discharge and High Voltage Engineering 265 - 268 1999.04

2組のNbTi機械式PCSから成る並列PCS回路のクエンチ特性 Reviewed

未入力

電気学会論文誌 119-B ( 3 ) 394 - 400 1999.03

NbTi機械式PCS開放時のアーク放電特性とアークが超伝導接点接続に及ぼす影響 Reviewed

大塚信也,大坪秀一,中村貴史,辻大輔,末廣純也,原雅則

電気学会論文誌B 118 ( 12 ) 1398 - 1405 1998.12

Magnetic Field Dependence of Transition Current of NbTi Mechanical PCS Reviewed

S.Ohtsuka,T.Nakamura,D.Tsuji,J.Suehiro,M.Hara

Cryogenics 38 ( 12 ) 1207 - 1212 1998.12

Characteristics of NbTi Mechanical Persistent Current Switch and Mechanism of Superconducting Connection at Contact Reviewed

S.Ohtsuka,H.Ohtsubo,T.Nakamura,J.Suehiro,M.Hara

Cryogenics 38 ( 9 ) 893 - 902 1998.09

Characteristics of NbTi mechanical persistent current switch and mechanism of superconducting connection at contact Reviewed

Ohtsuka S., Ohtsubo H., Nakamura T., Suehiro J., Hara M.

Cryogenics 38 ( 9 ) 893 - 902 1998.09

Authorship：Lead author Language：English Publishing type：Research paper (scientific journal)

A Persistent Current Switch (PCS) in a SMES system requires not only low ON resistance but also high OFF resistance in order to efficiently perform a load-leveling operation. Because a mechanical switch has the advantage of infinite OFF resistance, it can operate without generating Joule losses during the coil excitation and energy transfer process. However, it will cause an energy storage loss as long as the ON resistance, which mainly depends on contact resistance, is not decreased to zero. In this study, firstly case studies on energy losses due to the ON resistance of a mechanical switch and OFF resistance of a superconducting switch are carried out so as to show the necessity of a mechanical switch as a PCS in a large-scale SMES system. Secondly the contact resistance characteristics of a mechanical switch with NbTi bulk contact pieces are experimentally investigated as a function of switch driving force, switch pressing force, and ON-OFF operation number. Additionally, the effects of contact piece shape and its surface roughness on the contact resistance are examined. It was found that a superconducting connection at contact can be realized even if the switch is repeatedly opened and closed many times. The developed mechanical PCS, which has zero contact resistance, supports a superconducting current flow of more than 200 A. The formation mechanism of the superconducting connection at contact is modeled and analyzed based on theoretical considerations. © 1998 Cryogenic Association of Japan. Published by Elsevier Science Ltd. All rights reserved.

DOI： 10.1016/S0011-2275(98)00079-4

Scopus

Other Link： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=0032158054&origin=inward

Effect of Quench Time Lag on the Succeeding Quench in the Parallel Mechanical PCS Circuit Reviewed

S.Ohtsuka,D.Tsuji,K.Tsutsumi,J.Suehiro,M.Hara

Advances in Superconductivity XI Proc. of the 11th International Symposium on Superconductivity 2 1419 - 1422 1998.04

NbTiを用いた機械式スイッチ接点の超伝導化と超伝導接点接続形成機構の検討 Reviewed

大塚信也,大坪秀一,中村貴史,末廣純也,原雅則

低温工学 32 ( 10 ) 473 - 484 1997.10

Feasibility Study on a Mechanical Persistent Current Switch in SMES Reviewed

S.Ohtsuka,H.Ohtsubo,T.Nakamura,D.Tsuji,J.Suehiro,M.Hara

Proc. of the International Conference on Electrical Engineering 102 - 105 1997.04

Arc Discharge Characteristics Generated by Opening a NbTi Mechanical PCS Reviewed

S.Ohtsuka,T.Nakamura,D.Tsuji,J.Suehiro,M.Hara

Proc. of 1997 Japan Korea Joint Symposium on Electrical Discharge and High Voltage Engineering 141 - 144 1997.04

Quench Current Characteristics of Parallel Mechanical PCSs Reviewed

S.Ohtsuka,T.Nakamura,D.Tsuji,J.Suehiro,M.Hara

Proc. of 15th International Conference on Magnet Technology 1 551 - 554 1997.04

Contact Resistance Characteristics of Mechanical Switch Made of NbTi Reviewed

S.Ohtsuka,H.Ohtsubo,T.Nakamura,J.Suehiro,M.Hara

Proc. of the 8th Asian Conference on Electrical Discharge No.711 - No.711 1996.04

Characteristics of Contact Resistance between NbTi Electrodes Reviewed

S.Ohtsuka,H.Ohtsubo,T.Nakamura,J.Suehiro,M.Hara

Advances in Superconductivity IX Proc. of the 9th International Symposium on Superconductivity 2 1441 - 1444 1996.04

Simulation Test and Theoretical Analysis of Surge Propagation in Superconducting Magnet Reviewed

B.J.Choi,S.Ohtsuka,J.Suehiro,M.Hara

Cryogenics 35 ( 8 ) 505 - 513 1995.08

Effects of Coil Resistance on Surge Propagation Characteristics in a Superconducting Magnet Reviewed

B.J.Choi,S.Ohtsuka,J.Suehiro,M.Hara

Proc. of 9th International Symposium on High Voltage Engineering No.7878 - No.7878 1995.04

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