A New Algorithm for Relative Location of Voltage Sags Based on Voltage Measurements Only

This paper presents a tool easily implemented for relative location of voltage sags based on voltage measurements only. Voltage sags are considered from network faults in distribution systems only. This work present a new automatic tool for assessing power quality, characterising and extracting information from voltage records obtained from monitors in distribution systems. The algorithm requires measurements of minimum of three monitors located on electrical distribution system. The positive sequence voltages ​​are the descriptors used to determine the relative location of the voltage events. Finally the proposed method is applied to a simulation case and it is verified that the method can be helpful to determine the relative location of the voltage sags. MATLAB was used for validating this methodology, receiving voltage records of simulated voltage sags  in ATP-EMTP.