Abstract
A review of leakage current-based condition assessment
of metal oxide gapless surge arresters is presented in
this study. The fundamental principles that establish the relation
between the electrical condition diagnosis of these transient
overvoltage units and the resistive current component is discussed.
The commonly applied techniques of resistive current extraction
from the leakage current are revisited in this work. The problematic
influence of supply harmonics on leakage current evaluation
and the challenges related to practical measurements of the
instantaneous power-based technique of assessing the resistive
leakage current when the supply voltage is distorted.