Background: Power quality problems are identified in voltages and currents and are, mainly,
classified in harmonics, transients, and voltage sags. Besides current harmonics, voltage sags is the most
common type of issue especially with manufacturing consumers. To define voltage sags, they are shortduration
reduction in the rms voltage and they are mostly induced by remote short circuit. Determining
the critical distance of a fault that will cause certain pre-defined voltage sag at a specific bus is
uncomplicated and simple in radial systems. However, in a meshed power system, determining the
critical distance of a fault at specific line that will cause predefined voltage sag magnitude is not as
simple and has not been resolved by any of the existent studies. The aim of this paper is to provide
proper solution to find the critical distance in meshed power system.
Methods: The method has been applied and tested using a 6-bus system.
Result: A proper solution is achieved in this paper regarding the critical distance in a Meshed Power
System and the results shows the efficiency of the method used.