10.2.5 SettingsPID-6751-SETTINGS v2Table 169:SAPTOF (81H) Group settings (basic)Name Values (Range) Unit Step Default DescriptionOperation DisabledEnabled- - Disabled Operation Disabled/EnabledPUFrequency 35.00 - 90.00 Hz 0.01 51.20 Frequency set valueIntBlockLevel 0.0 - 100.0 %VB 1.0 50.0 Internal blocking level in % of VBasetDelay 0.000 - 60.000 s 0.001 0.000 Operate time delaytReset 0.000 - 60.000 s 0.001 0.000 Time delay for resetTable 170:SAPTOF (81H) Non group settings (basic)Name Values (Range) Unit Step Default DescriptionGlobalBaseSel 1 - 12 - 1 1 Selection of one of the Global Base Valuegroups10.2.6 Operation principle M14958-3 v7Overfrequency protection SAPTOF (81) is used to detect high power systemfrequency. SAPTOF (81) has a settable definite time delay. If the frequency remainsabove the set value for a time period corresponding to the chosen time delay, thecorresponding TRIP signal is issued. To avoid an unwanted TRIP due to uncertainfrequency measurement at low voltage magnitude, a voltage controlled blocking of thefunction is available, that is, if the voltage is lower than the set blocking voltageIntBlockLevel, the function is blocked and no PICKUP or TRIP signal is issued.10.2.6.1 Measurement principle M14958-6 v9The fundamental frequency of the positive sequence voltage is measured continuously,and compared with the set value, PUFrequency. Overfrequency protection SAPTOF(81) is dependent on the voltage magnitude. If the voltage magnitude decreases belowthe setting IntBlockLevel, SAPTOF (81) is blocked and the output BLKDMAGN isissued. All voltage settings are made in percent of the VBase, which should be set as aphase-phase voltage in kV. To avoid oscillations of the output PICKUP signal, ahysteresis has been included.Section 10 1MRK 511 408-UUS AFrequency protection310 Phasor measurement unit RES670 2.2 ANSITechnical manual
