Faulted‐phase identification scheme for series‐compensated transmission lines during the power swing

Abstract

Abstract To perform a fast faulted‐phase selection under the power swing in a series compensated line with a thyristor‐controlled series capacitor (TCSC) is an extreme challenge facing the transmission line protection schemes. Thus, this paper proposes a new scheme for recognizing the faulted‐phase in TCSC‐compensated transmission lines during the power swing. Primarily, the fault feature is extracted by using a modified Interclass correlation coefficient. The scheme utilizes the system‐current samples during the fault period and system‐current samples during the health state as two variables for obtaining the modified interclass correlation coefficient. Then a cumulative approach is used to enlarge the fault feature. The proposed scheme has been subjected to a wide variety of tests through different faults circumstances under different compensation levels. The experimental results have shown good performance against the high impedance/resistance fault under different TCSC‐compensation levels during the power swing. Also, the results showed a distinction in terms of time response due to its simple computation process.