Abstract
Leakage current monitoring is a widely employed technique to monitor the performance of outdoor insulation. The evaluation of leakage current waveforms recorded in the field, offers significant information since insulation’s performance is strongly linked with local conditions, and the waveforms’ shape correlate to different types of surface activity. In this paper, an investigation of leakage current waveforms recorded in a 150 kV coastal Substations suffering which suffers intense marine pollution is presented. Investigation of the recorded waveforms verified the basic waveform shapes described in the literature. Further, several variations of the basic types and complex waveforms, as well as field related waveforms, are presented. The need for added categorization criteria in the case of field measurements is discussed.
Highlights
VitellasAbstract— Leakage current monitoring is a widely employed technique to monitor the performance of outdoor insulation
One of the main problems concerning outdoor insulation is the pollution phenomenon, which is rather intense in areas located near the sea
Leakage current waveform monitoring has been performed by various researchers both in lab and field and a detailed review of measuring and analyzing LC on insulators and specimens can be found in [6]
Summary
Abstract— 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. Lab tests do not reproduce exact field conditions and field activity may differ from the one recorded in the lab. 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. Recorded data is investigated in order to identify field related noise.
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