Pitshou Ntambu Bokoro
Metal oxide surge arrester, condition monitoring, resistive current, harmonic-distortion, watt-loss
A review of proposed leakage current-based techniques applied in condition monitoring of metal oxide surge arresters is presented in this study. The fundamental conceptual theories that form the basis of resistive current extraction as well as the challenges associated to the implementation of measurement techniques are evaluated. The problematic influence of system voltage harmonics on reported leakage current assessment methods of gapless metal oxide surge protection units is also examined. It is therefore observed that the proposed methods are not completely reliable, and capacitive current compensation techniques remain the fundamental conceptual theory for future developments of accurate and practical measurement of resistive component without the knowledge of system voltage.