1. Tshwane University of Technology,Center for Energy & Electrical Power, Faculty of Engineering,Dept. of Electrical Engineering,Pretoria,South Africa
2. The Copperbelt University,School of Engineering,Dept. of Mechanical Engineering,Kitwe,Zambia
3. University of Zambia,School of Engineering,Dept. of Electrical & Electronic Engineering,Lusaka,Zambia,P.O.Box 32379