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IEC TC 57, August 2011, IEC 61850-90-5 Ed.1 : Use of IEC 61850 to transmit synchrophasor information according to IEEEC37. 118, http://www.IEC.ch/

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Bogdan Kasztenny, Normann Fischer, Héctor J. Altuve, Schweitzer Engineering Laboratories, May 2015, Negative-Sequence Differential Protection – Principles, Sensitivity, and Security, Presented at the 69th Annual Georgia Tech Protective Relaying Conference Atlanta, Georgia