Ap. Apostolov et al., IEEE/PSRC Working Group report on considerations in setting instantaneous overcurrent relays on transmission lines, IEEE POW D, 14(1), 1999, pp. 116-125
Setting instantaneous overcurrent (IOC) relays on subtransmission lines has
not been considered a complicated procedure by most utilities. However, un
desirable operations have drawn attention to their intended function and ap
plication. This report addresses the causes for erroneous instantaneous ove
rcurrent relay settings to help protection personnel avoid future undesirab
le operations.