Fault detection during power swing using Teager-Kaiser energy operator

Power swing is generated due to severe disturbances and causes modulation in voltage and current signals. Power swing modulates the voltage and current signals and lead to false operation of protective relays. Detection of fault during power swing is a challenging task. In this paper, a fault detection scheme is addressed which is based on Teager energy operator (TEO). TEO in discrete form uses only three consecutive samples. This TEO calculates the energy of the negative sequence current and has been used for fault detection during the power swing. The proposed scheme is tested for symmetrical and unsymmetrical faults. It also works well for high resistance fault, close-in fault and far end fault. The fault detection time is within 3-5 milliseconds. The local measurement of current makes the scheme feasible and easy to implement. Performance of the proposed technique is tested by taking the simulated data obtained from the system simulated using PSCAD/EMTDC software.