Section 8 Frequency protection8.1 Underfrequency protection SAPTUF8.1.1 IdentificationFunction description IEC 61850identificationIEC 60617identificationANSI/IEEE C37.2device numberUnderfrequency protection SAPTUFf <SYMBOL-P V1 EN818.1.2 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.8.1.3 Function blockSAPTUFU3P*BLOCKTRIPSTARTRESTOREBLKDMAGNIEC09000282_1_en.vsdIEC09000282 V1 ENFigure 78: SAPTUF function block1MRK 511 287-UEN A Section 8Frequency protection179Technical manual
