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Current transformers (CTs) may saturate during internal fault, external fault, over excitation, exciting inrush current and other phenomena, which would cause protection relay malfunction or even tripping. As a result, it is vital to mitigate the adverse effects of CT saturation. By analyzing the secondary current waveform, which has abrupt changes where saturation begins and ends, the paper proposes...
This paper proposes a novel method to detect the saturation intervals of current transformer (CT) secondary current. The method features the waveform properties of the distorted secondary current, which has abrupt changes where saturation begins and ends. Two algorithms, the improved morphological gradient and the morphological decomposition, are designed to extract the saturation intervals, respectively,...
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