Letter to the Editor: On Overcurrent Protection in Transmission Systems

摘要

Overcurrent protection must be done taking power quality (PQ) issues into account. A new methodology is presented, which allows the transformation of the voltage/ time immunity curve into a current/time curve that can be easily coordinated with the normal time/current characteristic (TCC) of protective devices. The presence of transformers changes the voltage-sag magnitude, which can be considered in the proposed methodology.