Pires, V. FernãoGuerreiro, M.Fortunato, CarlosMartins, L. Sousa2013-05-282013-05-282010http://hdl.handle.net/10400.26/4299This work presents a new approach for a current differential protection of the transmission lines. The proposed approach is based on the Clarke-Concordia transformation and principal component analysis. First the acquired current signals are transformed into “αβo” components by applying the Clarke-Concordia transformation. This allows obtaining typical patterns. To identify these patterns a principal component analysis is performed. Several tests under different fault conditions were performed. The obtained results allow verifying the effectiveness of the proposed approach.engCurrent differential protectionEigenvectorEigenvalueLine protectionDigital relayconference object