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Statistical Classification of Major Reliability Event Days in Distribution Systems

This white paper proposes defining a major event day in distribution reliability in terms of average frequency of occurrence. This definition is easy to understand for nontechnical people like regulators, seems to be fair to apply to systems of any size, and can be translated into a major event threshold that can be used to classify individual days. An example of this classification is given and practical issues such as the type of probability distribution to use, how to handle zero-outage days, and calculating normal annual reliability with major event days removed are discussed and resolved.