1. High Voltage and Energy Systems Research Lab, Department of Electrical and Electronics Engineering, University of West Attica, 12244 Egaleo, Greece
2. School of Civil Engineering, Aristotle University of Thessaloniki, GR-54124 Thessaloniki, Greece
3. Dipartimento di Ingegneria, Università degli Studi della Campania “Luigi Vanvitelli”, via Roma 29, 81031 Aversa, Italy