Fault detection in a series compensated line during power swing using superimposed apparent power

In this paper, detection of fault in a series compensated line during power swing is considered. Voltage and current signals contain non-fundamental components due to fault in a series compensated line during power swing. Presence of transients due to MOV and airgap operation, sub synchronous resonance, voltage and current inversions further make the fault detection process more complex. There are many conventional schemes available in literature to identify the fault during power swing. During power swing, both active and reactive powers oscillate within positive and negative regions, whereas the apparent power oscillates within positive region only. In this work, a superimposed apparent power based technique is proposed to detect the fault during power swing in a series compensated line. A 400 kV power system is simulated using EMTDC/PSCAD software. The performance of the technique has been considered for symmetrical fault, asymmetrical fault, far-end fault, high resistance fault, and single pole tripping situation during power swing in a series compensated line. Performance of the proposed technique is satisfactory and accurate.