Improvement of fault detection during power swing in series compensated line by using a Taylor series

During a power swing, the measured impedance may enter the relay protection zone and cause the relay to operate incorrectly. If the relay operates during power swing, it may cause the network to become unstable. Fault detection during a power swing in compensated lines via a series capacitor is more complicated than simple lines. In compensated lines, the amount of the fault current, the series capacitor and its protection equipment, the type of fault, the fault location, the type of capacitor protection, and the compensation level of the series capacitor are the factors affecting the impedance of the fault loop. In this paper, a new method for detecting fault during power swing is presented by using the magnitude of negative sequence phasor of current with the use of the Taylor series. The proposed method is simulated on the IEEE standard network and its performance has been evaluated. This method has high-speed performance for a variety of symmetric and asymmetric faults. The PSCAD and MATLAB programs are used to simulate the proposed method. Comparing the results with other methods shows the efficiency of the method presented in this paper.