Development and Field-Data Evaluation of Single-End Fault Locator for Two-Terminal HVDV Transmission Lines-Part 2 : Algorithm and Evaluation

A new technique for locating faults on a two-terminal HVDC transmission line which uses information from only one end of the line is developed and analyzed. The new technique uses successive reflections generated by faults. Using a differentiator and smoother the slopes of the transients are computed. Furthermore, the best estimated peaks of the slopes for the first two consecutive transients are obtained. The time interval between these two peaks is proportional to the fault location. The new technique is referred to as simple passive reflectometer (SPR). Field data obtained at the Celilo converter station of the Pacific HVDC Intertie (see the companion paper [1]) are used to evaluate the SPR. The agreement with a two-ended system is within one mile over the length of the 850-mile Pacific HVDC Intertie transmission line.