The paper presents the results of the implementation of two single-end data algorithms in ATP-EMTP program, the modules of the algorithm being associated with different power distribution grids. In the ATP-MODELS the algorithm developed by Takagi, but adapted for one-machine systems, and that developed by Das, improved in this approach, are implemented. DFT and replica impedance filters are used to calculate the fundamental frequency phasors of the transient voltages and currents. The considered parameters of the presented analysis are: line’s load, fault’s type and resistance and fault position along the power grid’s lines.

Keywords: Fault location, Single-end algorithms, ATP simulation.