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박병준,정세용,이정필,박병철,정년호,성태현,한영희,Park, B.J.,Jung, S.Y.,Lee, J.P.,Park, B.C.,Jeong, N.H.,Sung, T.H.,Han, Y.H. 한국초전도학회 2008 Progress in superconductivity Vol.10 No.1
A Superconductor Flywheel Energy Storage System(SFES) mainly consists of a pair of non-contacting High Temperature Superconductor(HTS) bearings that provide very low frictional losses, a composite flywheel with high energy storage density. The HTS bearings, which offer dynamic stability without active control, are the key technology that distinguishes the SFES from other flywheel energy storage devices, and great effort is being put into developing this technology. The Superconductor Journal Bearing(SJB) mainly consists of HTS bulks and a stator, which holds the HTS bulks and also acts as a cold head. Static properties of HTS bearings provide data to solve problems which may occur easily in a running system. Since stiffness to counter vibration is the main parameter in designing an HTS bearing system, we investigate SJB magnetic force through static properties between the Permanent Magnet(PM) and HTS. We measure stiffness in static condition and the results are used to determine the optimal number of HTS bulks for a 100kWh SFES.
김정년(J. N. Kim),김남열(N. Y. Kim),안미경(M. K. An),이상진(S. J. Lee),허회덕(Harris Heo),김광모(K. M. Kim) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.11
The role of SVL (Sheath voltage limiter) in cable system is to protect the PVC(or PE) jacket in case of transient overvoltage resulting from lightning and other causes. But, in Korea, there is so many SVL failure cases resulting from power frequency overvoltage. So, the paper investigates the phenomenon of failure SVL comparing with other countries' system. Finally, the installation of ECC(Earth Connectivity Conductor) in under ground cable system is presented to remove the possibilities of SVL thermal runaway due to the power frequency overvoltage.