Study of the Lightning Overvoltage Protection Effectiveness of High Voltage Mixed Overhead Cable Power Lines

In this paper, the effectiveness of lightning overvoltage protection cables in high voltage overhead cable lines has been analyzed. Because level, are protected by surge arresters and metallic sheath earthing. However, practice, quite a lot cases electricity-evoked damage to outer sheaths observed, proving that used is insufficient. As result, exposed environmental factors, especially moisture penetration, which contributes degradation. To explain causes situation, simulation studies were carried out determine relevant factors affecting level expected overvoltages. The circuit-field model line EMTP-ATP, COMSOL MATLAB software was for determining overvoltages on main insulation protective sheath. reveal efficiency ensured regardless strike location crest value its current. obtained results confirm no matter applied protection, may be with higher values than those insulation. Although analysis performed 110 kV lines, conclusions general also applicable power rated voltages.