Name Values (Range) Unit Step Default DescriptionOperationStep2 OffOn- - On Enable execution of step 2OpMode2 1 out of 32 out of 33 out of 3- - 1 out of 3 Number of phases required to operate (1of 3, 2 of 3, 3 of 3) from step 2U2< 1 - 100 %UB 1 50 Voltage start value (DT & IDMT) in % ofUBase for step 2t2 0.000 - 60.000 s 0.001 5.000 Definie time delay of step 2Table 114:UV2PTUV Non group settings (basic)Name Values (Range) Unit Step Default DescriptionGlobalBaseSel 1 - 6 - 1 1 Selection of one of the Global Base ValuegroupsConnType PhN DFTPhN RMSPhPh DFTPhPh RMS- - PhN DFT Group selector for connection type7.1.6 Monitored dataTable 115:UV2PTUV Monitored dataName Type Values (Range) Unit DescriptionUL1 REAL - kV Voltage in phase L1UL2 REAL - kV Voltage in phase L2UL3 REAL - kV Voltage in phase L37.1.7 Operation principleTwo-step undervoltage protection (UV2PTUV) is used to detect low power systemvoltage. UV2PTUV has two voltage measuring steps with separate time delays. If one,two or three phase voltages decrease below the set value, a corresponding STARTsignal is generated. UV2PTUV can be set to START/TRIP based on 1 out of 3, 2 outof 3 or 3 out of 3 of the measured voltages, being below the set point. If the voltageremains below the set value for a time period corresponding to the chosen time delay,the corresponding trip signal is issued. The time delay characteristic is settable for step1 and can be either definite or inverse time delayed. Step 2 is always definite timedelayed.UV2PTUV can be set to measure phase-to-earth fundamental value, phase-to-phasefundamental value, phase-to-earth true RMS value or phase-to-phase true RMS value.The choice of the measuring is done by the parameter ConnType. The voltage relatedsettings are made in percent of base voltage which is set in kV phase-to-phase voltage.This means operation for phase-to-earth voltage under:1MRK 511 287-UEN A Section 7Voltage protection159Technical manual
