5-138 F35 Multiple Feeder Protection System GE Multilin5.6 GROUPED ELEMENTS 5 SETTINGS5I2t CURVES:The curves for the I 2 t are derived from the formulae:, (EQ 5.11)where: T = Operate Time (sec.); TDM = Multiplier Setting; I = Input Current; I pickup = Pickup Current Setting;TRESET = Reset Time in sec. (assuming energy capacity is 100% and RESET: Timed)FLEXCURVES:The custom FlexCurves are described in detail in the FlexCurves section of this chapter. The curve shapes for the Flex-Curves are derived from the formulae:(EQ 5.12)(EQ 5.13)where: T = Operate Time (sec.), TDM = Multiplier settingI = Input Current, Ipickup = Pickup Current settingTRESET = Reset Time in seconds (assuming energy capacity is 100% and RESET: Timed)DEFINITE TIME CURVE:The Definite Time curve shape operates as soon as the pickup level is exceeded for a specified period of time. The basedefinite time curve delay is in seconds. The curve multiplier of 0.00 to 600.00 makes this delay adjustable from instanta-neous to 600.00 seconds in steps of 10 ms.(EQ 5.14)(EQ 5.15)where: T = Operate Time (sec.), TDM = Multiplier settingI = Input Current, Ipickup = Pickup Current settingTRESET = Reset Time in seconds (assuming energy capacity is 100% and RESET: Timed)RECLOSER CURVES:The F35 uses the FlexCurve feature to facilitate programming of 41 recloser curves. Please refer to the FlexCurve sectionin this chapter for additional details.Table 5–23: I 2 T CURVE TRIP TIMESMULTIPLIER(TDM)CURRENT ( I / I pickup)1.5 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.00.01 0.44 0.25 0.11 0.06 0.04 0.03 0.02 0.02 0.01 0.010.10 4.44 2.50 1.11 0.63 0.40 0.28 0.20 0.16 0.12 0.101.00 44.44 25.00 11.11 6.25 4.00 2.78 2.04 1.56 1.23 1.0010.00 444.44 250.00 111.11 62.50 40.00 27.78 20.41 15.63 12.35 10.00100.00 4444.4 2500.0 1111.1 625.00 400.00 277.78 204.08 156.25 123.46 100.00600.00 26666.7 15000.0 6666.7 3750.0 2400.0 1666.7 1224.5 937.50 740.74 600.00T TDM100II pickup---------------- 2--------------------------×= T RESET TDM100II pickup---------------- 2–----------------------------×=T TDM FlexCurve Time at II pickup---------------- ×= when II pickup---------------- 1.00≥T RESET TDM FlexCurve Time at II pickup---------------- × when II pickup---------------- 0.98≤=T TDM in seconds, when I I pickup>=T RESET TDM in seconds=
