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Leakage current monitoring is a widely employed technique to monitor the performance of outdoor insulation. The investigation of leakage current waveforms offers significant information since the waveforms' shape has been well correlated with different types of surface activity. Field waveforms are not often considered and investigated due to technical difficulties and the long term monitoring required for recording activity portraying waveforms. Therefore, the basic stages of activity have been defined mostly through accelerated lab tests. However, lab tests do not reproduce exact field conditions and therefore field activity may differ from the one recorded in the lab. In this paper, an investigation of LC waveforms recorded in a heavily polluted site, over more than 6 years of monitoring, is presented. A large variety of waveform shapes are portrayed and various correlations with world experience are made. In addition, recorded data is also investigated in order to identify field related noise. The need for added categorization criteria in the case of field measurements is discussed.

Investigation of Leakage Current Waveforms Recorded in a Coastal High Voltage Substation