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According more and more application by power electronic devices, a substantial increase in the variety loads as impact loads, nonlinear loads and fluctuation loads, which make change of power quality of power grid voltage, like the voltage swell, voltage sag, voltage fluctuation and flicker, voltage waveform deviation. Because of power quality problem mostly occur several types' disturbance, so the...
An adaptive fault line detecting method with correlation analysis using energy ratio is proposed based on the features of big capacitance current and high attenuation speed of hybrid transmission lines following single phase earthed fault. Applying wavelet packet decomposition, characteristic waveband of each zero sequence current can be determined by the theory of maximum energy, which can exclude...
While the hybrid transmission lines of distribution network occur the single line to ground faults, a fault line detecting method with HHT detective then compare the phase relation based on the phase relation of zero sequence current between fault line and unfault line is reverse. A morphological filter is first developed to filter noise in transient zero sequence currents. Applying HHT detective...
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