Research on Online Localization Method of Partial Discharge of AC Distribution Cable Based on Improved GCC Algorithm
Due to the influence of electromagnetic noise and other factors,the existing on-line office dis-charge level method cannot accurately locate the office discharge fault.To handle it,this paper propo-ses an online localization method for cable local discharge signals that is suitable for practical engineering applications,based on the double-end localization method.The proposed method uses an improved gener-alized correlation algorithm to estimate the signal time delay,and takes into account the wave speed uncer-tainty of the local discharge signal.To improve local localizing accuracy under multiple localizing samples,a trimmed-mean data filtering speed algorithm is employed.Simulation and experimental results demon-strate that the proposed method effectively enhances time delay estimation accuracy and reduces localiza-tion error,even under complex electromagnetic noise environment and restricted sampling rates of detec-tion equipment,when compared to traditional time delay estimation localization methods.The experimental localizing relative error was found to be only 0.47%,which meets actual engineering requirements.
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