故障暂态行波和注入信号配合的单相接地故障定位研究

fter researching the advantages and disadvantages of existed methods for the fault line location in small current grounded system, this paper presents a method of fault location by coordinating fault transient traveling wave with artificial injection pulse signal. According to the different phase of the fault phase, a reasonable choice to use line own information or injection signal be made. According to intervals of adjacent traveling wave wavelet transform modulus maximum, propagation time between fault and measuring points can be identified, in order to achieve location. A large number of simulation results show that the method proposed can give exact location results for single-phase-to-earth fault in small current grounded system, and overcome the deficiency of only one location method be used could easily lead to an inaccurate result.