Power Swing Detection Using the Variation Rates of the Average Value of Apparent Power

Power swing is a transient phenomenon in the power system that occurred by several reasons include line outage, a sudden increase or decrease in load, fault and etc. The power swing may cause entering the impedance seen by distance relay into its protective zones and causing to the undesirable operation of this relay. This undesirable operation of distance relay may cause create an instability in the power network and subsequently leading to blackouts. In this paper, a new method for power swing detection using the variation rates of the average value of apparent power is proposed. The proposed method has been tested using Digsilent and Matlab software in the standard two-area network.