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A new adaptive fault location technique based on phasor measurement unit (PMU) for double circuit transmission lines is presented in this paper. Voltages and currents of the transmission line obtained through PMU are used for the on-line estimation of line parameters such as line impedance and capacitance. According to the fault feature of double circuit transmission lines a six-sequence fault component method is employed to implement fault location for parallel lines. For extremely long transmission lines, distributed capacitance has great influence on the accuracy of fault location. In the fault location method used in this paper, the distributed capacitance is allocated to the two terminals of the transmission line as lumped parameter in order to achieve higher accuracy. Extensive EMTP simulation results show that the proposed algorithm is independent of fault distance, fault type, fault resistance, uncertainty of transmission parameters and parallel line asymmetry.