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The paper deals with two concepts of the under-frequency load shedding. The first one is a conventional scheme based on frequency deviation measuring and no intentional delay and the second one is based on the measurement of frequency derivation with variable intentional time delay. The case studies of system wide and local disturbances proved that these concepts can coexist and solve frequency stability issues in transmission and distribution systems.doi:10.34890/972 fatcat:g4fammt6urfaviltjk2e4v5ufu