Abstract
Distance protection encounters some problems such as time coordination, protection of short lines, capacitive charging current and high impedance faults. Its shortcomings are extended in the case of protection of hybrid transmission lines, including overhead line and underground cable. To cope with the mentioned problems, in this paper, a novel approach is proposed for pilot protection of hybrid transmission lines. The proposed approach utilizes three phase voltage and current signals of both ends and transfer matrix of the hybrid line. Indeed, voltage and current angles of specific points on the line are calculated from both ends and the absolute values of the differences between the results obtained from the sending and receiving ends are computed for each point to detect the fault and identify its exact location and phase. The achieved results confirm the security, dependability, and efficiency of the algorithm in critical conditions of power system, i.e., high impedance fault occurrence, power swing, different strengths of equivalent sources at both ends, loss of time synchronization of remote end data, and different fault locations with various inception angles. Although the proposed method is very simple, its performance is surprisingly satisfactory and it is suitable for practical implementation in real-life applications.
Published Version
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