Accurate traveling-wave front detection based on morphology and HHT
Zhang Jiabei · Dianli zidonghua shebei · 2009
The high frequency components of traveling-wave front attenuate greatly because of the high resistance and dispersion of long transmission line,to which,an accurate detection method of traveling-wave front arriving time based on mathematical morphology and HHT is presented.The traveling-wave signals are filtered with mathematical morphology and the high frequency parts,IMF1 and IMF2 components,are picked up by EMD to detect precisely position the arriving time of traveling-wave front.If IMF1 component can not clearly represent the reflected traveling wave front because of bigger wave attenuation caused by lightning strike corona and transmission line parameter frequency variation,IMF2 component is then applied.The detection resolution is one sampling point.Digital simulative data and practical engineering data show that,the proposed method is correct and effective,and has been applied in the traveling-wave analysis and fault locating equipment.