Accurate modeling of overhead transmission lines (OHTLs) for transient analysis require that the ground which the phase conductors are suspended be considered on the longitudinal impedance and transversal admittance matrices. In this framework, some models deal with the soil as an ideal conductor (constant resistivity ${\rho }_{\text{g}}$ and relative permittivity ${\epsilon }_{\text{r}}$). However, it is known fact that real soils are characterized by frequency-dependent (FD) electrical parameters (${\rho }_{\text{g}}(f$) and ${\epsilon }_{\text{r}}(f$)). Due to these conditions, different formulations to represent the soil with FD parameters have been developed in the last decades. In order to obtain a precise transient response, these models must be incorporated in longitudinal impedance, as the ground-return impedance, and transversal admittance matrices. In this article, an analysis to compute the impact of some FD soil electrical parameters on transient responses is carried out. These responses are calculated for an energization maneuver and ligtning direct strike on OHTLs with different lengths located above constant and FD soil parameter models of low and high soil resistive values. Results show significant differences between the transient responses obtained with the constant and FD soil models, which these variations are more pronounced for soils of high resistivity and for short OHTLs.

用于瞬态分析的高架输电线路（OHTL）的精确建模要求在纵向阻抗和横向导纳矩阵上考虑悬挂相导体的地面。在此框架中，某些模型将土壤视为理想导体（恒定电阻率${\rho }_{\text{G}}$ 和相对介电常数 ${\epsilon }_{\text{[R}}$）。但是，已知的事实是，真实土壤的特征在于频率相关（FD）的电参数（${\rho }_{\text{G}}（F$） 和 ${\epsilon }_{\text{[R}}（F$））。由于这些条件，在过去的几十年中已经开发出不同的配方来表示具有FD参数的土壤。为了获得精确的瞬态响应，必须将这些模型并入纵向阻抗（作为接地回路阻抗）和横向导纳矩阵。在本文中，进行了分析以计算某些FD土壤电参数对瞬态响应的影响。计算这些响应是为了对不同长度的OHTL施加增能和轻击直接打击，这些OHTL位于低和高土壤电阻值的恒定和FD土壤参数模型上方。结果表明，在恒定和FD土壤模型中获得的瞬态响应之间存在显着差异，对于高电阻率土壤和短OHTL，这些变化更为明显。