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首页> 外文期刊>Electric power systems research >Analysis of transient voltages and currents in short transmission lines on frequency-dependent soils
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Analysis of transient voltages and currents in short transmission lines on frequency-dependent soils

机译：依赖于频率依赖性土的短传输线瞬态电压和电流分析

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摘要

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 p(g) and relative permittivity epsilon(r)). However, it is known fact that real soils are characterized by frequency-dependent (FD) electrical parameters (p(g)(f) and epsilon(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.
机译：用于瞬态分析的顶部传输线（OHTLS）的精确建模要求将相导体被悬浮的地面考虑在纵向阻抗和横向导段矩阵上。在该框架中，一些模型处理土壤作为理想导体（恒定电阻率P（g）和相对介电常ε（R））。然而，已知真实的土壤以频率依赖（FD）电参数为特征（P（g）（f）和epsilon（f））。由于这些条件，在过去的几十年中已经开发出不同配方用FD参数表示具有FD参数的土壤。为了获得精确的瞬态响应，这些模型必须以纵向阻抗结合在一起，作为地返回阻抗和横向导段矩阵。在本文中，进行了计算一些FD土壤电参数对瞬态响应的影响的分析。这些响应是为了在OHTL上的通电机动和连接直接击球，具有位于低和高土壤电阻值的恒定和FD土壤参数模型的不同长度。结果显示使用恒定和FD土壤模型获得的瞬态响应之间的显着差异，这些变化对于高电阻率和短的OHTLS的土壤更为明显。

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