Abstract
The present standards of AC insulation tests for high voltage power equipment in Japan are based on the reliability evaluation according to the Weibull statistical distribution as fault (breakdown or partial discharge) occurrence probability of the equipment. This paper analyzes various issues in the process, such as how to apply Weibull distributions as well as their experimentally determined parameters for transformers and GIS’s (gas insulated switchgears). The present evaluation is not considered proper as it does not take into account non-accidental change of the equipment with time. The paper gives the proper expression of the fault probability when two different levels of voltage are applied to equipment. It also discusses the issues of an n-value (slope of V-t characteristics in a logarithmic scale) separated in two time regions as well as experimental data for GIS’s.
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