10.3.7 Technical dataM14976-1 v9Table 176:SAPFRC (81) Technical dataFunction Range or value AccuracyTrip value, pickup function (-10.00-10.00) Hz/s ±10.0 mHz/sTrip value, restore enablefrequency(45.00-65.00) Hz ±2.0 mHzDefinite restore time delay (0.000-60.000) s ±0.2% or ±100 ms whichever isgreaterDefinite time delay for frequencygradient trip(0.200-60.000) s ±0.2% or ±120 ms whichever isgreaterDefinite reset time delay (0.000-60.000) s ±0.2% or ±250 ms whichever isgreater10.4 Frequency time accumulation protection functionFTAQFVR (81A) GUID-124A1F91-44C0-4DB6-8603-CC8CA19AE2A6 v310.4.1 Identification GUID-87605DA0-EAA6-4A6C-BF03-7FDB187E1B29 v2Function description IEC 61850identificationIEC 60617identificationANSI/IEEEidentificationFrequency time accumulationprotectionFTAQFVR f<> 81A10.4.2 Functionality GUID-020CE8CF-9BEA-455D-ACBD-13023B93B4D1 v5Frequency time accumulation protection (FTAQFVR (81A)) is based on measuredsystem frequency and time counters. FTAQFVR (81A) for generator protectionprovides the BFI_3P output for a particular settable frequency limit, when the systemfrequency falls in that settable frequency band limit and positive sequence voltagewithin settable voltage band limit. The BFI_3P signal triggers the individual eventtimer, which is the continuous time spent within the given frequency band, and theaccumulation timer, which is the cumulative time spent within the given frequencyband. Once the timers reach their limit, an alarm or trip signal is activated to protect theturbine against the abnormal frequency operation. This function is blocked duringgenerator start-up or shut down conditions by monitoring the circuit breaker positionand current threshold value. The function is also blocked when the system positivesequence voltage magnitude deviates from the given voltage band limit which can beenabled by EnaVoltCheck setting.Section 10 1MRK 511 408-UUS AFrequency protection318 Phasor measurement unit RES670 2.2 ANSITechnical manual
