1. Electrical Insulation Research Center, Institute of Materials Science, University of Connecticut, Storrs, Connecticut 06269, USA
2. Department of Electrical and Computer Engineering, University of Connecticut, Storrs, Connecticut 06269, USA
3. ABB Industrial Connections & Solutions LLC, Plainville, Connecticut 06062, USA
4. General Electric Research One Research Circle, Schenectady, New York 12309, USA