Abstract
In this paper, similar metal oxide-based arresters
are tested using accelerated ageing tests with low and high
total harmonic distortion content in the AC voltage stress. The
extrapolated ageing times obtained are modelled using the threeparameter
Weibull statistical distribution. The hypothesis testing
based on the likelihood ratio test is invoked in order to ensure
no possibility of equal probability density functions, which are
therefore applied to estimate or predict the mean life of MOSA
under distorted ac voltage stress. The results obtained indicate
that the likelihood ratio test is found to be -1.2855 and the mean
life obtained for MOSA samples aged with a total harmonic
distortion content of 8.5% in the voltage stress is reduced by
30.13%.