Lightning-Induced Voltages on an Overhead Dielectric-Coated Conductor

This paper discusses the influence of a dielectric-coated conductor on the simulation of lightning-induced voltages on a single-phase overhead line. A parametric study is performed considering different load conditions, different values of ground conductivity and different stroke locations. It is shown that for realistic properties of the insulating material the induced-voltage waveforms are only slightly modified compared to the bare conductor case, especially at observation points that are close to the lightning-incidence point. If both ends of the line are unmatched, an oscillatory behavior is observed on the resulting voltage waveforms. An increasing time delay is observed in successive peak values if the relative permittivity and the thickness of the insulating layer are increased, but the overall characteristics of the induced voltage waveforms are not modified. A statistical study indicates that neglecting the insulating layer can be considered a good approximation for estimating the peak values of lightning-induced voltages on a single-phase overhead line.