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首页> 外文期刊>Electric power systems research >Measurement of fault resistances in transmission lines by using recorded signals at both line ends
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Measurement of fault resistances in transmission lines by using recorded signals at both line ends

机译：通过使用线路两端的记录信号来测量传输线路中的故障电阻

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This article shows the results obtained by using a method for the calculation of fault resistances in transmission lines, like these resistances are really seen at the location of protective relays. The method is based on a well-known algorithm for fault location, which is complemented here in order to compute the fault resistances. The original algorithm for fault location only uses information from one line end, and it is applied twice here (once from each line end) in order to obtain the information to compute the fault resistances. For each fault, a fault resistance is computed from each line end, and the reported value is the average of both values if they satisfy the selected criterion of coherence (otherwise, the measurement is considered as no valid). This method was applied for the measurement of fault resistances for 70 actual faults, recorded at different voltage levels (230 kV, 400 kV, and 765 kV). The statistical behavior of these measured values shows that the fault resistances are moderate in a high percentage of cases. The knowledge about the statistical behavior of fault resistances is important for the protection of transmission lines, and these results can be complemented in the future by analyzing more data, in order to improve this knowledge. Other methods, based in other fault location algorithms, could be also applied in order to obtain the measured values of fault resistances from recorded data of real faults. The application of a criterion of coherence, for comparing the computed values of fault resistance from each line end, is a novel idea and it is important to consider the possible imperfections in the measurements and/or in power system models. (C) 2016 Elsevier B.V. All rights reserved.
机译：本文显示了通过使用一种计算传输线故障电阻的方法获得的结果，就像在保护继电器的位置上确实看到了这些电阻一样。该方法基于用于故障定位的众所周知的算法，在此对该算法进行补充以计算故障电阻。原始的故障定位算法仅使用来自一个线路端的信息，并且在此处（两次来自每个线路端）应用了两次，以便获得信息以计算故障电阻。对于每个故障，将从每个线路端计算出一个故障电阻，如果两个值都满足所选的相干性标准，则报告的值为两个值的平均值（否则，该测量被视为无效）。该方法用于测量70个实际故障的故障电阻，并记录在不同的电压水平（230 kV，400 kV和765 kV）下。这些测量值的统计行为表明，在很大比例的情况下，故障电阻中等。有关故障电阻的统计行为的知识对于保护输电线路非常重要，将来可以通过分析更多数据来补充这些结果，以提高这一知识。也可以应用基于其他故障定位算法的其他方法，以便从实际故障的记录数据中获得故障电阻的测量值。应用相干性准则比较每个线路末端的故障电阻的计算值是一个新颖的想法，重要的是要考虑测量和/或电力系统模型中可能存在的缺陷。 （C）2016 Elsevier B.V.保留所有权利。

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