Accurate fault location algorithm for transmission lines based on R-L model parameter identification

Accurate transmission lines fault location is important for power industry. An accurate time domain algorithm for fault location using one-terminal data is presented. The algorithm is based on the modal analysis and the R-L model of transmission lines, and fully utilizes the effective information provided by fault-superimposed components. The differential equations of fault network and pure-fault network are employed to determine the fault distance. The fault distance, fault resistance and source parameters at the remote end are solved as the unknown variables of system model, so the theoretical error of conventional one-terminal approaches is eliminated completely. Fault resistance, system operation mode and network configuration do not affect fault location accuracy of the proposed method. The simulation results demonstrate the validity and high accuracy of the algorithm. In the average location error is 0.0796% from 20 to 280 kilometers, and the maximum error is not more than 0.173%. The truncation error is the primary error source of this algorithm.