Modeling of Conductors Catenary in Power Lines: Effects on the Surge Propagation Due to Direct and Indirect Lightning

Abstract

In this article, the effects of the variable height in overhead power lines are investigated with reference to the surges produced by direct and indirect lightning events. Simulations are carried out both by an implicit finite-difference time-domain scheme and by the commercial tool EMTP-RV. Differences in the waveforms computed by the two approaches are discussed and clarified. Additionally, the validity of the commonly adopted assumption of weakly varying vertical component of the incident electric field is investigated.

Incorporating the LEMP Impact on Lightning Surge Analysis of Transmission Lines in EMT Simulators

“…The overhead lines including the phase conductors and OHGW(s) were modeled by a thin-wire representation method, which modifies the permittivity and permeability of the cells surrounding the conductor [62]. The lines were modeled as straight lines and the sag of the line [63] was not considered. The bundled phase conductors of 275 and 500 kV vertical double-circuit lines were modeled using a single conductor by setting their radii based on the geometric mean distance.…”