Reliability analysis of low-voltage metal-oxide surge arresters using accelerated failure time model

Abstract

Abstract: Failure progression of metal oxide-based surge arresters in response to exposure to harmonics is modelled using the accelerated failure time model. Multi-stress accelerated ageing tests, with and without AC distorted voltage stress, are conducted on arrester samples sourced from different suppliers to obtain baseline and harmonic-factor logarithmic life and reliability functions. A maximum likelihood approach is taken to estimating the accelerated failure time model parameters based on the failure time data. The modelled harmonic-factor reliabilities prove MOV life acceleration and show multiplicative failure progression of up to 41 times faster for a THD content of 8.52% in the applied voltage stress