In order to provide a novel and more effective alternative to the commonly\nused relay protection testing device that outputs only the sinusoidal testing\nsignals, the concept of fault waveform regenerator is proposed in this paper,\ntogether with its hardware structure and software flow chart. Fault waveform\nregenerator mainly depends on its power amplifiers (PAs) to regenerate the\nfault waveforms recorded by digital fault recorder (DFR). To counteract the\nPAâ??s inherent nonlinear distortions, a digital closed-loop modification technique\nthat is different from the predistortion technique is conceived. And the\nexperimental results verify the effectiveness of the fault waveform regenerator\nbased on the digital closed-loop modification technique.
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