ABSTRACT
Rigorous analytical treatment of distribution reliability requires well-defined
units of measurements, referred to as metrics. Unfortunately, reliability vocabu-
lary has not been used consistently across the industry, and standard definitions
are just beginning to be adopted. This chapter begins by providing definitions for
terms and indices commonly used in the areas of power quality and reliability. It
continues by comparing engineering measures of reliability with economic
measures, and concludes with a discussion on reliability targets.
