The impact of routine smaller outages on distribution system customers in terms of customer minutes interrupted can be tracked using conventional reliability indices. However, the customer minutes interrupted in large blackout events are extremely variable, and this makes it difficult to quantify the customer impact of these extreme events with resilience metrics. We solve this problem with the System Average Large Event Duration Index SALEDI that logarithmically transforms the customer minutes interrupted. We explain how this new resilience metric works, compare it with alternatives, quantify its statistical accuracy, and illustrate its practical use with standard outage data from five utilities.

翻译：常规小型停电对配电系统用户的影响可通过传统可靠性指标（如用户中断分钟数）进行追踪。然而，大规模停电事件中的用户中断分钟数具有极高的变异性，这使得难以通过韧性指标量化此类极端事件对用户的影响。我们通过引入系统平均大事件持续时间指数SALEDI来解决这一问题，该指标对用户中断分钟数进行对数变换。本文阐释了这一新型韧性指标的工作原理，将其与替代方案进行比较，量化了其统计准确性，并利用来自五家电力公司的标准停电数据展示了其实际应用价值。