- Institute of Power System Engineering, Wroclaw 1 Institute of Power System Engineering, Wroclaw University of Technology, Wroclaw, Poland 1 Institute of Power Transmission and High Voltage Technology, University of Stuttgart, Germany 1 Institute of Power Transmission and High Voltage Technology, University of Stuttgart, Germany. (on leave from Wroclaw University of Technology, Wroclaw, Poland) 1 Institute of Power, Warsaw - Institute+of+Power+Transmission+and+High+Voltage+Technology,+University+of+Stuttgart,+Germany.+(on+leave+from+Wroclaw+University+of+Technology,+Wroclaw,+Poland) 3 Izykowski, J 1 JACEK LISTWAN, JL 17 Janik, P - Janik, P.