1. Lublin University of Technology,Department of Electrical Devices and Hight Voltage Technology,Lublin,Poland
2. Vincent Pol University in Lublin,Department of Economics,Lublin,Poland
3. West Pomeranian University of Technology,Department of High Voltage and Power Engineering,Szczecin,Poland
4. Energo-Complex, Sp.,Piekary Slaskie,Poland
5. University of Zilina,Department of Mechatronics and Electronics,Zilina,Slovakia