10.2.7 Technical dataM14964-1 v12Table 145:SAPTOF technical dataFunction Range or value AccuracyOperate value, start functionat symmetrical three-phasevoltage(35.00-90.00) Hz ±2.0 mHzOperate time, start at fset-0.02 Hz to fset +0.02 Hz fn = 50Hz Min. = 80 msMax. = 95 ms-fn = 60 Hz Min. = 65 msMax. = 80 msReset time, start at fset +0.02Hz to fset -0.02 HzMin. = 15 msMax. = 30 ms-Operate time, definite timefunction at fset -0.02 Hz to fset+0.02 Hz(0.000-60.000)s ±0.2% ±100 mswhichever is greaterReset time, definite timefunction at fset +0.02 Hz tofset -0.02 Hz(0.000-60.000)s ±0.2% ±120 ms,whichever is greater10.3 Rate-of-change of frequency protection SAPFRCIP15748-1 v410.3.1 IdentificationM14868-1 v4Function description IEC 61850identificationIEC 60617identificationANSI/IEEE C37.2device numberRate-of-change of frequency protection SAPFRCdf/dt ><SYMBOL-N V1 EN-US8110.3.2 Functionality M14965-3 v13The rate-of-change of frequency protection function (SAPFRC ) gives an earlyindication of a main disturbance in the system. SAPFRC measures frequency withhigh accuracy, and can be used for generation shedding, load shedding andremedial action schemes. SAPFRC can discriminate between a positive or negativechange of frequency. A definite time delay is provided for operate.SAPFRC is provided with an undervoltage blocking. The operation is based onpositive sequence voltage measurement and requires two phase-phase or threephase-neutral voltages to be connected. For information about how to connect1MRK 505 394-UEN A Section 10Frequency protectionLine differential protection RED650 2.2 IEC 277Technical manual