[1] Univ Connecticut, Dept Elect Engn, Elect Insulat Res Ctr, Storrs, CT 06269 USA
[2] Univ Connecticut, Dept Phys, Storrs, CT 06269 USA
[3] Univ Toronto, Dept Elect & Comp Engn, Toronto, ON, Canada
[4] TM T&D Corp, Transmiss & Distribut Res & Dev Ctr, Kawasaki, Kanagawa 2100682, Japan