Evaluation of advanced technologies for power transformers

Six-inch size models, with multiple samples wound concentrically, offer a reliable vehicle for achieving consistent performance of the proposed turn-to-turn insulation system. Construction and testing of a short-circuit test coil and preliminary theoretical analysis produced information indicating the advantage of the sheet-wound construction when subjected to short-circuit forces and exposed those areas needing attention during the Phase 1 program. Preliminary development of electromagnetic axisymmetrical finite element programs for calculating the magnetic field (and related parameters) and temperature (and related parameters) were initiated. These programs have been completed in the Phase 1 program. Parametric design studies on prototype and demonstration units to be evaluated in the Phase 1 program and work on the facilities and equipment needs for the manufacturing technology work in Phase 1 were completed and revealed no major difficulties. This work has helped considerably in preparing for the extensive work planned in Phase 1 on these technologies.