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Abstract The focus of this research work is on the reliability evaluation of distribution substations using an analytical approach. Basic load point reliability indices are to be evaluated at various load points in a substation taking into account both passive and active failures, malfunction of normally closed circuit breakers, and scheduled maintenance. Then, additional system reliability indices for the whole substation are to be evaluated, which can be used in comparing substation designs based on their reliability. Besides, this research work allows developing a reliability model for distribution substations to be utilized in HL-III adequacy assessment. This thesis recognizes the need for an appropriate modeling for various components used in substations. This permits the inclusion of all the realistic component failure modes in the reliability prediction, and appeared through two categories of minimal cutsets; basic and non-basic. The analytical approach utilized here for reliability evaluation is based on a Failure Modes and Effects Analysis (FMEA) which employs the technique of minimum cutsets to compute the frequency and duration of a fault with respect to the criterion of continuity of electric service. In addition, a computer program is described for generation of minimal paths, generation of minimal cutsets, and evaluation of reliability indices. The application of this program is illustrated by considering a practical substation example |