Probabilistic assessment of financial losses due to interruptions and voltage sags-part I: the methodology

This paper presents a generalized methodology for stochastic/probabilistic assessment of the annual financial losses due to interruptions and voltage sags. The costs of interruptions and voltage sags are treated separately and then combined in order to estimate the total financial losses in the network per annum. The methodology proposed is applicable to both assessment of individual customer losses and assessment of total network losses. It takes into account in a probabilistic manner all the uncertainties associated with the voltage sag calculation, sensitivity of customers´ equipment to voltage sags, the interconnection of the equipment within an industrial process, and customer types and the location of the process in the network.