A new tracking method of symmetrical fault during Power Swing Based on S-Transform

Current distance relay is accommodated with Power Swing Blocking (PSB) scheme. However, this blocking scheme prove to vulnerable to distance relay operation as it could block the trip signals if the symmetrical fault occur during power swing. Hence, it is important to develop the proper fault detection scheme during power swing to avoid such undesirable circumstances. This paper presents a new detection technique to detect symmetrical fault during power swing by using S-Transform analysis based on the current, voltage, and three-phase active and reactive power signals waveform. To evaluate the effectiveness of the proposed technique, testing has been conducted under IEEE 9 bus test system. Simulation results show that the proposed technique can reliably detect symmetrical fault occurring during power swing.