Development of criteria and calculation of Korean industrial customer interruption costs

This paper presents the results of direct interview survey of Korean industrial customers conducted to evaluate the direct, short-term impacts and costs resulting from local random electrical supply interruptions. The cost is evaluated using the questionnaires authors designed, which are mainly on the experience or preparatory actions consumers predicted they would take. Economic evaluation of reliability that traditionally takes into account duration and frequency of interruption does not accurately reflect the lost value or economic impacts of industrial customer, especially large size, caused by any kind of interruption. So, to imply the substantial difference in costs incurred by different customer group, the authors apply the international standards, i.e. IEC, IEEE, of the recent classification of interruption to reflect the difference of interruption characteristics on the questionnaires for the analysis of the interruption cost.