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In case of wet pollution, pollution layer create anappropriate path for leakage current and increasing of thispollution leads to more values of this leakage current. Thereforefor better recognition of insulator changing process fromnormal state to fault outbreak, studying of leakage current andartificial aging models is necessary. In this paper, theexperimental test results on polymer insulator with voltage of20 KV have been shown. Artificial aging on insulators has beendone using solid layer methods according to IEC60507standard. Leakage current waveforms during the experimentalstudies were measured. Normally fast Fourier transform (FFT)method used to find the harmonic spectrum in the leakagecurrents. Three states of analysis are considered. In the firststage, it is done with nominal voltage and without arc. In thesecond state, it is done in presence of dry band arcing andcorona discharge and in the last case, continues arc isinvestigated and in each stage harmonic analysis is performed.It is observed that in last stage the 3rd harmonic componentsincrease rather than two previous stages

Leakage Current Analysis and FFT Calculation on Polluted Polymer Insulator