Application of customer exposure ratio to distribution circuits

Resources are constrained at utilities and utility engineers and managers search for better tools to help them direct resources appropriately in order to improve reliability. Today´s reliability indices and other circuit statistics and measures may not be sufficient to provide an indication if additional resources should be spent on improving a circuit´s reliability. Customer Exposure Ratio (CER) quantifies the amount of protection on a circuit. This paper will define CER and describe its application for optimizing reliability given a constrained budget.