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Electrical power system robustness is defined as the intrinsic capacity of an electrical power system to maintain assigned disturbance levels when external conditions change. In this paper the concept of robustness against is applied to the voltage dips, one of the most severe disturbances in power quality. Using graphical color schemes as immediate tools, improvements and/or degradations of the electrical power system robustness are assessed when the structure of distribution system is modified. In particular, both substitutions of components (from overhead to cable lines) and installation of new components (connection of DG units) are considered as possible structure modifications. The proposed tools are applied to different study cases.