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This paper presences an accurate and robust fault location algorithm for transmission lines utilizing Static Synchronous Series Compensator (SSSC). The presence of SSSC on a transmission line has a great influence on the measured impedance at the relaying point. Firstly a detailed model of the SSSC and its control is proposed and then a precise fault location algorithm employing adaptive neuro fuzzy (ANFIS) is presented. A MATLAB_SIMULINK test system is modeled to investigate the proposed algorithm. The results obtained allow concluding that the fault location algorithm is accurate with respect to SSSC presence.