Section 9 Voltage protection9.1 Two step undervoltage protection UV2PTUV9.1.1 IdentificationFunction description IEC 61850identificationIEC 60617identificationANSI/IEEE C37.2device numberTwo step undervoltage protection UV2PTUV3U<SYMBOL-R-2U-GREATER-THANV2 EN279.1.2 FunctionalityUndervoltages can occur in the power system during faults or abnormal conditions.Two step undervoltage protection (UV2PTUV) function can be used to open circuitbreakers to prepare for system restoration at power outages or as long-time delayedback-up to primary protection.UV2PTUV has two voltage steps, where step 1 is settable as inverse or definite timedelayed. Step 2 is always definite time delayed.UV2PTUV has a high reset ratio to allow settings close to system service voltage.9.1.3 Function blockUV2PTUVU3P*BLOCKBLKST1BLKST2TRIPTR1TR2STARTST1ST1L1ST1L2ST1L3ST2IEC09000285_1_en.vsdIEC09000285 V1 ENFigure 130: UV2PTUV function block1MRK 502 048-UEN A Section 9Voltage protection257Technical manual
