Effect of impedances line length to voltage sag propagation

Occurrences of faults in power system contribute extensive voltage sags (dips) in a network. These occurrences have introduced problems to consumers mainly at 415V where sensitive control equipment is located. This paper investigates the propagation and travelling of voltage sag event under the influence of transformer connections and impedance line length. PSS/ADEPT (Power System Simulator Advanced Distribution Engineering Productivity Tool) was used to construct and simulate the test system for the study. Installation of monitoring devices cannot be done in every part of voltage level because it increases cost and is difficult to manage. The test system used allows major variations in network parameter for understanding its influence on voltage sag propagation. It is important to understand on how voltage sag propagates and travels through different voltage levels in power system network as whether it reaches and harms consumer equipment.