MICRO SUPERCONDUCTING MAGNETIC ENERGY-STORAGE (SMES) SYSTEM FOR PROTECTION OF CRITICAL INDUSTRIAL AND MILITARY LOADS

A 6 MJ, 750 kVA Micro SMES system has been designed to protect critica l loads against voltage sags and interruptions, as well as to provide continuous power conditioning, Life-cycle costs have been minimized th rough the use of energy efficient refrigeration units, Maintenance is simplified through the use of Line Replaceable Units (LRU). Availabili ty is maximized through a design approach which allows the magnet to c ontinue protecting the load even in the case of refrigeration degradat ion or total failure, Reliability is maximized by the use of proven co mmercial-off-the-shelf (COTS) items, The system provides ride-through capability for similar to 9 seconds at a power level of 454 kW. The sy stem comprises a niobium titanium superconducting magnet, permanent co nduction cooled hybrid current leads, a low loss cryostat, a closed-lo op refrigeration subsystem, an off-the-shelf uninterruptible power sup ply (UPS), a magnet interface unit to connect the magnet to the UPS, a nd an off-the-shelf monitoring unit providing both local and remote mo nitoring capability of system parameters.