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A Traveling Wave-Based Fault Location Method Using Unsynchronized Current Measurements

机译：基于非同步电流测量的基于行波的故障定位方法

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摘要

This paper presents a traveling-wave-based fault location method for two terminal transmission lines using unsynchronized current measurements from intelligent electronic devices (IEDs) recorded at both ends. In the formulation, the method considers practical implementation issues such as IED hardware and software processing delays, and data synchronization error. In this method, two possible fault location solutions are determined using the first two traveling wave arrival time recorded at both terminals. Then, the correct fault location is identified between the two based on the faulted half-section information. Identification of faulted half-section is accomplished by comparing the rise time of the first traveling wave recorded at both terminals of the line. The proposed method does not require GPS synchronization and field experiments to calibrate the various asymmetrical delays and synchronization error. The method is tested on a 220 kV transmission line using data simulated in EMTDC/PSCAD tool with frequency-dependent phase models. The proposed method can locate faults using unsynchronized data with various asymmetrical delays, whereas classical methods work properly only for synchronized data with symmetrical delays. The performance of the proposed method is evaluated for different fault scenarios. The proposed method demonstrated high accuracy, noise immunity, robustness against fault inception angles, and high impedance faults. Test results are compared with classical two-terminal methods for a transmission line.
机译：本文提出了一种基于行波的故障定位方法，该方法使用两端记录的智能电子设备（IED）的不同步电流测量值来对两条终端传输线进行故障定位。在公式中，该方法考虑了实际的实现问题，例如IED硬件和软件处理延迟以及数据同步错误。在此方法中，使用记录在两个终端的前两个行波到达时间确定两个可能的故障定位解决方案。然后，根据故障半截面信息在两者之间确定正确的故障位置。通过比较记录在线路两端的第一个行波的上升时间，可以确定故障半段。所提出的方法不需要GPS同步和现场实验来校准各种不对称延迟和同步误差。该方法在220 kV输电线路上使用在EMTDC / PSCAD工具中模拟的数据进行了测试，该工具具有频率相关的相位模型。所提出的方法可以使用具有各种不对称延迟的非同步数据来定位故障，而经典方法仅适用于具有对称延迟的同步数据。针对不同的故障情况评估了该方法的性能。所提出的方法显示出高精度，抗干扰性，对故障起始角度的鲁棒性以及高阻抗故障。将测试结果与传输线的经典两端子方法进行了比较。

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