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A new digital distance relaying scheme presented in this paper provides adequate protection to series-compensated double-circuit lines during a simultaneous open conductor and ground fault. The proposed scheme is based on the derivation of the compensated values of impedance using the symmetrical components theory. It measures the correct value of fault impedance for different fault locations. different values of fault resistance. various zero-sequence mutual coupling impedance. different levels of series compensation. and various system loading conditions. Further. it does not require remote-end data. A comparative evaluation of the proposed scheme and the conventional scheme indicates that the proposed scheme is highly accurate and robust against wide variations in system and fault parameters as its percentage error is within 4.19%.
