A Single-Ended Fault Location Method Based on Distributed Parameter Model for Half-Wavelength AC Transmission Line

With the increasing demand for ultra-long distance and ultra-high power transmission, half-wavelength transmission technology has attracted the attention of many experts and scholars. However, most scholars mainly focus on the steady-state operation characteristics, protection scheme and other aspects, less attention to fault location. A Single-ended Fault Location Method based on distributed parameter model is proposed in this paper. Under the distributed parameter model, the voltage and current at each point along the line can be calculated through the initial electrical quantity. Because the length of the half wavelength line is too large, a calculation point is set at a certain distance at every interval to reduce the computation. By comparing the voltage values of the calculation points along the line, the point with the smallest voltage is the point nearest to the fault point. Using the voltage and current of the point, the differential equation is constructed, and the fault location is accurately calculated by solving the equation with the least square method. RTDS simulation proves that this method is suitable for half-wavelength line, and it is not affected by fault location and fault type, and has better ranging performance.