Combination of the Methods of symmetrical components and Double Entry to Increase the Reliability of Digital Differential Relay ProtectionAleksandr L. Kulikov, Boris V. Papkov, Anton A. Kolesnikov and Vladimir Ju. VukolovE3S Web Conf., 69 (2018) 02016DOI: https://doi.org/10.1051/e3sconf/20186902016