高压架空电力线路产生电场的相位效应

A. Sălceanu, S. Ursache, O. Asiminicesei, C. Lazarescu
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引用次数: 7

摘要

首先,有三个原因说明为什么高压架空电力线(HVOhPL)发出的控制和减少电场的话题必须得到更多的关注:外电场感应的电流是垂直的,并通过最敏感的人体细胞和器官,通常的环境水平有时非常接近普遍接受的参考值,还有一个优点是用真实的现场测量来检查模拟,而不受相电流恒定变化值的影响。然后综合了高压输配电网络的电气和几何特性(使用的塔和电线坐标),这是使仿真尽可能接近现实的重要起点。模拟是用两个易于访问、易于使用的程序进行的,其中相位对电场强度的影响已经接近,同时假设了最常见的三相双电路类型。关于最佳相位的建议取决于三相的相对分布:垂直线、水平线或等腰三角形。本文还对土壤电导率对电场强度及其下降速率的影响进行了研究。
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Phasing Effect on the Electric Fields Generated by High Voltage Overhead Power Lines
To begin with, there are listed three reasons why the topic of control and reduction of electric field issued by High Voltage Overhead Power Lines (HVOhPL) must be given greater attention: the currents induced by the external electric field are vertical and pass through the most sensitive human cells and organs, the usual ambient levels are sometimes very close to the generally accepted reference values and there is also the advantage of checking the simulations with real field measurements that are not influenced by the constant change value of the phase currents. Then a synthesis of the electrical and geometrical characteristics of the high voltage transmission and distribution networks (used pylons and wires coordinates) is presented, an essential starting point for making simulations as close as possible to reality. The simulations have been performed with two accessible, easy-to-use programs, in which the phasing influence on E-field strength has been approached, while assuming the most common types of three-phase double circuits. The recommendations on optimum phasing differ depending on the relative distribution of the three phases: vertical line, horizontal line or isosceles triangle. Conclusions are also presented regarding the influence of soil conductivity on resulting E-field strength and on its descending slew-rate.
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