Current differential protection has stringent real-time communications requirements and it is critical that protection traffic is transmitted securely, i.e., by using appropriate data authentication and encryption methods. This paper demonstrates that real-time encryption of protection traffic in IP/MPLS-based communications networks is possible with negligible impact on performance and system operation. It is also shown how the impact of jitter and asymmetrical delay in real communications networks can be eliminated. These results will provide confidence to power utilities that modern IP/MPLS infrastructure can securely and reliably cater for even the most demanding applications.
S.M. Blair, C.D. Booth, B. De Valck, D. Verhulst, C. Kirasack, K.Y. Wong, S. Lakshminarayanan, 13th International Conference on Development in Power System Protection 2016 (DPSP), Edinburgh, UK
KEYWORDS: Communications, current differential protection, encryption, IEC 61850, IEEE C37.94, teleprotection