CHAPTER 5: SETTINGS GROUPED ELEMENTSM60 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL 5-2115I2 t curvesThe curves for the I 2 t are derived from the formulae:, Eq. 5-34whereT = Operate Time (in seconds)TDM = Multiplier SettingI = Input CurrentIpickup = Pickup Current SettingTRESET = Reset Time in seconds (assuming energy capacity is 100% and RESET: Timed)Table 5-32: I 2 t curve trip timesFlexCurvesThe custom FlexCurves are described in detail in the FlexCurves section of this chapter. The curve shapes for theFlexCurves are derived from the formulae:Eq. 5-35Eq. 5-36whereT = Operate Time (in seconds)TDM = Multiplier settingI = Input CurrentIpickup = Pickup Current settingTRESET = Reset Time in seconds (assuming energy capacity is 100% and RESET: Timed)Definite time curveThe 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 frominstantaneous to 600.00 seconds in steps of 10 ms.Eq. 5-37Eq. 5-38whereMultiplier(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-------------- 1.00T 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=
