ACTIVELY SHIELDED TRANSPORTABLE SMES-SYSTEMS

Previous investigations on active shielding of SMES systems have prove d to be successful in reducing the stray field. It was shown that the stray field of a single solenoidal SMES can be diminished by adding sh ielding solenoids under the condition that the sum of the magnetic dip ole moments of all coils equals zero, Computations revealed diameters of those SMES arrangements in the range of several meters for a given SMES capacity of 50 kWh, which may be appropriate for grid stabilizati on. This restricts coil transportation severely, The present paper mai nly concentrates on this problem and deals with SMES systems with oute r diameters not more than 2.3 m, This provides easy transportation eit her on rail or on road with the crucial benefit that only final assemb ly of prefabricated modules has to be done on the prospective site, An arrangement of such an actively shielded transportable SMES will be o ptimized for a minimum of length and for a minimum of superconductor. Furthermore its performance in reducing the stray field will be compar ed to previous SMES systems.