Analytical Evaluation of Dielectric Breakdown Test Based on One-minute Step-up Method

The authors previously pointed out that the results of insulation tests based on the one-minute step-up method deviate from the "true values". In the present study, these deviations are evaluated by numerical simulations. These deviations were found to exist not only under limited conditions in numerical simulations but to exist fundamentally on the one-minute step-up test method. This should be taken into consideration when making actual insulation designs.