Echo Response of Faults in Transmission Lines: Models and Limitations to Fault Detection
Echo Response of Faults in Transmission Lines: Models and Limitations to Fault Detection
复制标题
输电线路故障的回波响应：故障检测的模型和限制
DOI：
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发表时间：
2016
影响因子：
4.3
通讯作者：
L. Pichon
中科院分区：
文献类型：
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作者：
A. Cozza;L. Pichon
本文介绍了测试信号激励下输电线路故障产生的时域回波模型，如在时域反射计（TDR）的应用中。这里考虑的故障包括传输线的传播特性的局部修改。结果表明，故障的响应是强烈的分散性的性质，这意味着他们的回波的峰值是远远不能提供一个准确的测量故障的严重程度，因为它在很大程度上取决于测试信号的频率内容，以及故障的长度。有人认为，输电线路故障检测是一个不适定的问题，需要对故障本身的先验知识。这些结果是很重要的TDR方法的应用，特别是早期预警监测潜在的关键故障，从他们的发病，因为它表明，在相对较低的频率测试故障的回波可能会导致低估其实际的严重性。
This paper introduces models of the time-domain echoes generated by faults in transmission lines excited by test signals, e.g., as in applications of time-domain reflectometry (TDR). Faults considered here include local modifications of the propagation characteristics of a transmission line. It is shown that the responses of faults are strongly dispersive in nature, which implies that the peak of their echo is far from providing an accurate measure of the severity of the fault, as it heavily depends on the frequency content of the test signal as well as on the length of the fault. It is argued that fault detection in transmission lines is an ill-posed problem that requires a priori knowledge on the fault itself. These results are important for applications of TDR methods, particularly for early warning monitoring of potentially critical faults from their onset, since it is shown that echoes from faults tested at relatively low frequencies can lead to underestimate their actual severity.