A single-ended traveling-wave-based fault location for a hybrid transmission line using detected arrival times and TW′s polarity

Abstract

This paper proposes a single-ended traveling-wave-based fault location scheme for transmission systems consisting of an overhead line combined with an underground cable. In the first step, the proposed algorithm uses the three-phase voltages measured through optical sensors at the fault locator installation bus to extract the traveling wave arrival times using two consecutive sliding windows and curve fitting. Then, using the arrival times of three consecutive collisions and changes of their polarity, the faulty section is identified. Finally, the exact location of the fault is determined. To evaluate the performance of the proposed algorithm, transient state simulations were performed in EMTP-ATP for various conditions of fault and system parameters. The transient signals are processed and the results prove the high accuracy of the proposed method.