(High;
Voltage;
Direct;
Current~Smart;
Grid;
Research;
Center,;
School;
of;
Engineering,;
University;
of;
KwaZulu-Natal,;
Durban4001,;
South;
Africa;
and;
Technology;
Division,;
Multidisciplinary;
Research;
Centre,;
University;
of;
Namibia,;
Windhoek;
0001,;
Namibia;
Zinc;
Mine,;
Vendanta;
Group,;
Rosh;
Pinah;
0000,;
Namibia;