干旱区生态环境知识资源中心

In this report, we have examined the influence of a discontinuous pollution layer width on the behavior of a laboratory plan model on which we reproduce the surface state of the 1512L insulator greatly used in algerian desert areas. The investigations were carried out by analyzing the leakage current magnitude, the phase angle current-voltage, the flashover process and leakage current frequency characteristics. Because the recorded leakage current waveforms include too many distortions, we have elaborated a numerical tool treating the leakage current signal allowing to determine its frequency spectra using the Discreet Fourier Transformed. The phase angle is determined from voltage and current phase spectra or also from the angles of their fundamentals.