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This paper presents a novel algorithm for secondary current signal segmentation of saturated current transformer (CT) using three morphological gradient-based detectors. The saturation onset detector is used to monitor the occurrence of saturation and then trigger the positive/negative segmentation detector, which are designed to locate the starting point and the ending point of CT saturation. The...
Sympathetic interaction between transformers would lead to mal-operation of transformer differential protection. Based on the fact that the waveform of internal fault current has the sinusoidal features while the sympathetic inrush has not, a weighted mathematical morphological method is proposed for the identification of sympathetic inrush. In the simulation studies, the identification results have...
This letter proposes a novel differential protection scheme for transmission lines based on skewness. The skewnesses of the differential current and restraining current are used jointly to identify the fault in transmission lines. The proposed scheme does not need to compensate the distributed capacitive current and is immune to noise. The feasibility of proposed scheme has been verified on a 1000...
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