This article proposes an alternative for low impedance shunt fault location in radial power distribution systems using the fundamentals of voltage and current measured at the power substation. This proposal includes typical characteristics of power distribution systems, such as unbalances, non-homogeneous line sections and untransposed lines; also we consider the capacitive effect that can significantly affect the behavior of a fault location method. The proposed method, presents errors in location of about 1% respect to the radial length where fault is located.