1 O.T. Eule, Borna, Germany 1 ODRA, TV 2006 1 Oechsle, F - of Electrical Power Engineering 2 Olejniczak, J - Olejniczak,+J 1 Ontario Hydro Research Division, Canada 5 Orlowska-Kowalska, T 2 Orłowska-Kowalska, T 2 Osowski, S