Stress Distribution and Displacements on the Electromechanical Shield of a Superconducting Generator After a Three-Phase Fault

Abstract

We assume that there is a cylindrical electromechanical shield between the armature and the field windings of a superconducting generator. The maximum shield load after an open circuit three-phase fault is derived. The resultant stress distribution and displacements are calculated for two cases: for the case of a thick wall long shield, where two dimensional plane strain conditions are assumed away from the two end supports, and for the case of the moderately thick to thin shield wall, where an approximate solution is derived which approximately satisfies the three dimensional elasticity equations and the end boundary conditions. The solution was applied to 2-pole and 4-pole machine designs.