Title :
Algorithm for instant overcurrent relays based on the angle variations of current phasor
Author :
Vicente, Rafael San ; Cortés, Raúl ; Robles, Jaime ; Chong-Quero, J. Enrique
Author_Institution :
Inst. Technologico y de Estudios Superiores de Monterrey, Monterrey
Abstract :
An algorithm based on the angle variations of the current phasor under failure conditions is presented. The current phasor is calculated with the recursive algorithm of the discrete Fourier transform (RDFT). The behavior of the phasorpsilas angle is analyzed under frequency variations according to the standard (plusmn0.5Hz or 0.8% of the nominal frequency). Also the behavior of the phasorpsilas angle is analyzed under failure conditions, simulating different faults in different instants of the sinusoidal waveform of the current. Finally, the obtained algorithm is presented.
Keywords :
discrete Fourier transforms; overcurrent protection; recursive functions; relay protection; angle variations; current phasor; discrete Fourier transform; overcurrent relays; recursive algorithm; sinusoidal waveform; Analytical models; Discrete Fourier transforms; Failure analysis; Fault currents; Fourier transforms; Frequency; Phase detection; Protective relaying; Relays; Voltage; Discrete Fourier transforms; Fault currents; Protective relaying; RDFT;
Conference_Titel :
Industrial Technology, 2008. ICIT 2008. IEEE International Conference on
Conference_Location :
Chengdu
Print_ISBN :
978-1-4244-1705-6
Electronic_ISBN :
978-1-4244-1706-3
DOI :
10.1109/ICIT.2008.4608340
