Modelling consumer voltage sags caused by distribution primary faults

In recent years, managers and engineers of industrial and commercial facilities have expressed their deep concerns about the disruption of their electronic and computerized processes due to the frequent occurrence of lower voltage conditions on their power delivery systems, particularly voltage sags. The cause of these voltage sags is often attributed to line faults occurring in the utility transmission and distribution systems. This paper presents the phase and line-to-line voltage sag levels seen at an individual customer´s facilities due to transmission and distribution faults occurring at various locations within the utility´s network configurations. The models used to describe the transmission and distribution system operating characteristics are based on the detailed component electrical models contained in MatLab Power Blockset.