An accurate fault location and its data processing by least square method

摘要

When a fault occurs on the transmission line, it is required to find out the fault point, clear the fault and resume power supply as soon as possible. This required a highly accurate fault location. Besides the principle of algorithm, the precision of fault location is also influenced by the way the sampled data being processed. In this paper, the differential equation is taken as the algorithm of transmission line fault location. The estimation by least square method has the optimum statistic character under some certain conditions. After the parameter being estimated by the least square method, considering the model of noise system cannot be easily obtained, the auxiliary variable method is introduced to rectify it. The EMTP simulation and RTDS simulation confirm the validity of the data processing method and the result is steady. This indicates that the method works well in reducing the influence of noise. The accuracy can satisfy the requirement in engineering.