Section 10 Frequency protection10.1 Underfrequency protection SAPTUF10.1.1 IdentificationFunction description IEC 61850identificationIEC 60617identificationANSI/IEEE C37.2device numberUnderfrequency protection SAPTUFf <SYMBOL-P V1 EN8110.1.2 FunctionalityUnderfrequency occurs as a result of a lack of sufficient generation in the network.Underfrequency protection SAPTUF measures frequency with high accuracy, and isused for load shedding systems, remedial action schemes, gas turbine startup and soon. Separate definite time delays are provided for operate and restore.SAPTUF is provided with undervoltage blocking.10.1.3 Function blockSAPTUFU3P*BLOCKTRIPSTARTRESTOREBLKDMAGNIEC09000282_1_en.vsdIEC09000282 V1 ENFigure 102: SAPTUF function block1MRK 504 135-UEN A Section 10Frequency protection231Technical manual
