^pKey;
Laboratory;
of;
High;
Voltage;
&;
Electro;
Magnetic;
Compatibility,;
North;
China;
Electric;
Power;
University,;
Beijing;
102206,;
China;
^pElectric;
Power;
Bureau,;
Hunan;
Electric;
Company,;
Yongzhou;
425000,;
China;
^pof;
Electrical;
and;
Information;
Engineering,;
Changsha;
University;
of;
Science;
and;
Technology,;
Changsha;
410014,;
China;