^pKey;
Laboratory;
of;
Power;
Transmission;
Equipment;
&;
System;
Security;
and;
New;
Technology;
(College;
of;
Electrical;
Engineering),;
Chongqing;
University,;
Chongqing;
400044,;
China;
^pof;
Materials;
Science;
and;
Engineering,;
Jiangsu;
University,;
Zhenjiang;
212013,;
China;
^pLaboratory;
of;
Semiconductor;
Materials;
Science;
(Institute;
of;
Semiconductors,;
Chinese;
Academy;
of;
Sciences),;
Beijing;
100083,;
China;
^ptate;
Key;
Laboratory;
of;
Electrical;
Insulation;
and;
Power;
Equipment;
(Xi'an;
Jiaotong;
University),;
Xi'an;
710049,;
China;
^pEngineering;
Research;
Institute;
of;
Jiangsu;
University,;
Changzhou;
213000,;
China;
^pKey;
Laboratory;
of;
New;
Ceramic;
and;
Fine;
Processing;
(Tsinghua;
University),;
Beijing;
100083,;
China;