Electrical power system robustness is defined as the intrinsic capacity of an electrical power system to maintain as- signed disturbance levels when external conditions change. This paper compares two methods for estimating voltage dip severity: the critical distance method and the fault position method. Their differences are not linked to the type of network but to the type of results which we are searching for. This paper proposes a graphical color visualization of the during fault voltage matrices that imme- diately correlates dip severity with colors defined by a proper scale. New robustness indices are also proposed to synthesize bus perfor- mance in terms of affected and exposed areas. Numerical applica- tions refer to real transmission and real distribution systems.
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