Determination of marginal reliability indices in a distribution network

This paper presents the method of marginal reliability indices determination in the distribution network. Forced outages have been divided into subjective, objective and mixed ones. Each outage part has been calculated regarding the whole number of outages and subsequently, using critical analysis, permitted number of outages has been calculated. The permitted number of outages is a basis for the determination of marginal reliability indices. Marginal reliability indices are calculated for the distribution system, per voltage, per levels, per units (lines, cables and transformer stations) and per components. This calculation gives a more complete insight into the examination of the reliability in the distribution network.