Optimization of the flat power cables' electrical insulation system

The authors studied the electric field distribution in flat cables as a function of dimensions and isolation materials. If the maximum electrical stress is higher than 25 kV/in, corona will be generated. The parametric study indicated that the electrical stress can be reduced by the proper selection of conductor dimensions, the use of semiconductive polytetrafluoroethylene (PTFE) material, and rounding off of the edges. The results of the calculations were verified by high-voltage tests in which the corona inception voltage of typical designs was measured. The calculated inception voltage correlated well with the measured voltage.<>