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首页> 外文期刊>Electric power systems research >Relevant factors for temporary overvoltages due to fault-resonance conditions on half-wavelength transmission lines
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Relevant factors for temporary overvoltages due to fault-resonance conditions on half-wavelength transmission lines

机译：半波长传输线上由于故障谐振条件而导致暂时过电压的相关因素

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摘要

This article explains the phenomenon of severe temporary overvoltage (TOV) due to critical faults on a very long transmission line with half-wavelength properties. Such non-conventional AC lines are an alternative to bulk power transmission over very long distances and present excellent steady-state properties. However, half-wavelength lines can present fault cases with very different natures of the voltage response due to fault-resonance conditions. The present document introduces a further explanation of these fault-resonance conditions. First, this study analyses the resonance at the fundamental frequency and analytically determines the TOV considering the fault location, the type of fault, and a simple model of system components. Coherence of major phenomena is obtained with time-domain simulation. Then, a more detailed method for analysing overvoltages on half-wavelength lines under fault conditions is presented. Here, a sensitivity analysis is implemented using PSCAD/EMTDC with more accurate models of system components. Factors such as the type of fault, sequence circuit, fault location, short-circuit level, fault resistance, loading level, transformer saturation and ground resistivity are considered. Finally, the paper interprets the impact of those factors on fault-resonance conditions and TOV.
机译：本文介绍了由于具有半波长特性的超长传输线上的严重故障而导致的严重临时过电压（TOV）现象。这种非常规的交流线路可替代很长距离的大功率传输，并具有出色的稳态性能。但是，由于故障谐振条件，半波长线可能会呈现出电压响应的特性非常不同的故障情况。本文介绍了这些故障共振条件的进一步说明。首先，这项研究分析了基频上的谐振，并根据故障位置，故障类型和简单的系统组件模型来分析确定TOV。主要现象的相干性通过时域仿真获得。然后，提出了一种更详细的方法来分析故障条件下半波长线上的过电压。在这里，使用PSCAD / EMTDC和更准确的系统组件模型来进行灵敏度分析。考虑诸如故障类型，顺序电路，故障位置，短路水平，故障电阻，负载水平，变压器饱和度和接地电阻率等因素。最后，本文解释了这些因素对故障共振条件和TOV的影响。

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