For citations:

Romaniuk F.A., Rumiantsev V.Yu., Rumiantsev Yu.V. Determining the Current Frequency in Digital Relay Protection Devices. ENERGETIKA. Proceedings of CIS higher education institutions and power engineering associations. 2026;69(1):23-33. (In Russ.) https://doi.org/10.21122/1029-7448-2026-69-1-23-33