Open AccessOnline Measurement of Voltage Gradient Distortion and Leakage Current of Heavily Contaminated Outdoor Insulation Using Thermal Imaging
Author(s) -
Maurizio Albano,
Ronald T. Waters,
Mohammed El Amine Slama,
A. Manu Haddad
Publication year - 2023
Publication title -
ieee transactions on dielectrics and electrical insulation
Language(s) - English
Resource type - Journals
eISSN - 1558-4135
pISSN - 1070-9878
DOI - 10.1109/tdei.2023.3340985
Subject(s) - fields, waves and electromagnetics , engineered materials, dielectrics and plasmas
A new thermal model of an insulator heat loss coefficient proves that evaporation power loss is more significant than thermal conduction to a moist environment. Consequently, the leakage current in a moist pollution layer may cause dry-band formation. Such bands are bridged and sustained by streamer discharges, which can initiate partial arcing. Clean-fog tests of contaminated insulators have been shown to provide infrared (IR) temperature data for the model, and the evaluation of voltage gradients in this dry-band regime. The same modeling also offers a unique method of online leakage current monitoring.