Section 9 Frequency protection9.1 Underfrequency protection SAPTUF9.1.1 IdentificationFunction description IEC 61850identificationIEC 60617identificationANSI/IEEE C37.2device numberUnderfrequency protection SAPTUFf <SYMBOL-P V1 EN819.1.2 FunctionalityUnderfrequency occurs as a result of lack of generation in the network.Underfrequency protection SAPTUF is used for load shedding systems, remedialaction schemes, gas turbine startup and so on.SAPTUF is provided with an undervoltage blocking.9.1.3 Function blockSAPTUFU3P*BLOCKTRIPSTARTRESTOREBLKDMAGNIEC09000282_1_en.vsdIEC09000282 V1 ENFigure 131: SAPTUF function block9.1.4 SignalsTable 156:SAPTUF Input signalsName Type Default DescriptionU3P GROUPSIGNAL- Three phase group signal for voltage inputsBLOCK BOOLEAN 0 Block of function1MRK 502 034-UEN - Section 9Frequency protection255Technical Manual
