Fault-Locator Scheme for Combined Taba-Aqaba Transmission System Based on New Faulted Segment Identification Method

Abstract

In this paper, a new fault locator scheme is introduced to address the non-homogeneity of combined transmission lines (Taba-Aqaba Intertie transmission system). To achieve this goal, the faulted side is first determined using a new algorithm for identifying faulted segments. This identification algorithm relies on the voltage's rate of change along the nonhomogeneous lines in the pure positive-sequence circuit, exploiting the inequality of positive-sequence impedances between power cables and overhead lines. The number of outputs generated by the algorithm is one less than the number of line segments being analyzed. For systems with two segments, the output directly identifies the faulted segment. However, for combined lines with three segments, a new voting system is utilized to determine the faulted segment. The fault distance is then calculated based on the identified faulted segment. To evaluate the proposed scheme, various fault scenarios are simulated on the Taba-Aqaba Intertie transmission system, which connects the Egyptian and Jordanian networks, using ATP-EMTP. These tests encompass different fault types and locations, including cases near the interconnection points between the segments. Additionally, the scheme is tested under nonlinear faults.

A Fault Location Algorithm for Multi-Section Combined Transmission Lines Considering Unsynchronized Sampling

“…Ultimately, only the section that delivers a correct answer within the range of interest is identified as an actual fault. In [32], a novel method for fault identification is introduced. The approach is based on the rate of the change in voltage along a non-homogeneous line in a positive-sequence circuit.…”

“…Subsequently, the fault distance is calculated based on analysis of the identified fault section. Importantly, the methods of [31,32] both require synchronized measurement data. In [33], a fault location scheme devoid of parameters was introduced to estimate the location of faults on a hybrid transmission line, employing unsynchronized data; however, it considers only a two-section transmission line.…”