Recurrent plot and quantification of leakage current for monitoring the insulator surface state under non-uniform desertic pollution

This work is devoted to study the influence of the increasing of the width of the polluted band on insulators used in desert regions, by measuring the leakage current through the insulators surface. The Recurrent Plot technique (RP) is used to analyze the leakage current (LC) signal for monitoring the insulators surface state. This technique is applied directly on the leakage current waveforms, and the high frequency components are extracted from the leakage current signal using the wavelet transform technique. We also used the Recurrent Quantification Analysis (RQA) technique to quantify the RP characteristics of the LC signal and high frequency components, by computing the Recurrence Rate (RR), the Determinism (DET) and the Laminarity (LAM).