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

fYear

2008

fDate

21-24 April 2008

Firstpage

1

Lastpage

4

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;

fLanguage

English

Publisher

ieee

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

Type

conf

DOI

10.1109/ICIT.2008.4608340

Filename

4608340