Smart & Effective Monitoring of Surge Arresters: Utility Experience & Feedback
Monitoring leakage current has become standard practice to assess the condition of gapless metal oxide surge arresters and today’s monitoring devices are able to provide highly accurate readings. However, users often still lack specific knowledge in regard to how best to assess arrester condition based on whatever leakage current behavior is observed. This presentation explains arrester failures and related leakage current patterns. These findings are based on field experience with station and line arresters covering thousands of monitors in service for at least several years, typically under difficult ambient conditions and at different system voltages.