Inverse Power Law based Inclusive Life Model for DC Polarity Reversal Stresses

In this paper, carefully designed experiments are reported, which indicate that the change in frequency of voltage polarity reversals results in a change in slope of v-t characteristics on the inverse power law. The power law parameters are shown to be systematic functions of frequency of polarity reversals. Based on these results, the authors propose a comprehensive inverse power law for DC polarity reversal stress application, in place of conventional inverse power law. The proposed modification is examined with experimental data of authors apart from that available in literature and found to be working well. The model provides the maximum frequency of a reversal for maximizing the life of power equipment which may pave the way for deciding on the maximum frequency of voltage reversals.