A Traveling-wave-based Fault Location Method in Transmission Line based on LMD and TEO

Abstract

When Local Mean Decomposition (LMD) is used to detect the arrival time of traveling wave, the instantaneous frequency of the component PF may lead to wrong results for detecting the arrival time of traveling wave. From the above, a novel algorithm is proposed to detect the arrival time of traveling wave, and it is based on Local mean decomposition (LMD) and Teager Energy Operator (TEO). Firstly, the high frequency component of LMD is obtained through decomposing the aerial mode of voltage traveling wave; Secondly, based on Teager Energy Operator(TEO), the instantaneous energy spectrum of PF is calculated; thirdly, the arrival time of traveling wave can be determined according to the first sudden arising of energy in the instantaneous energy of PF1; and the wave velocity can be measured online by calculating the transfer time of traveling wave on the healthy line. Lastly, the fault distance is calculated according to the principle of the double-ended traveling–wave-based fault location. Under different fault conditions, simulation tests show that the novel LMD-TEO-based method has more accurate than Wavelet Transfrom and Hilbert-Huang Transform in detecting the arrival time of traveling wave.. KeywordsTraveling wave; Fault Location; Local Mean Decomposition; Teager Energy Operator;Transmission Line