Accurate Fault Location Estimation Method for Overhead-Cable Multi-Section Transmission Lines

In this paper, a new method is proposed for fault location estimation in overhead-cable multi-section transmission lines. This method takes advantage of synchronized samples gathered from both terminals of the line in the time domain. Because of this, it does not need a filter to extract fundamental frequency of the voltages and currents. Thus, it shows a higher accuracy, since it is not influenced by frequency response of the filter and decaying DC component. On the other hand, this algorithm uses distributed parameter line model and consists of K stages for fault location determination (K: the number of the line sections), and unlike the other methods, it does not require a recognizer to determine the faulty section of the line. The accuracy of the algorithm has been investigated by various tests, which show the high accuracy of the proposed method while different fault types occur on various locations with a variety of incidence angles.