1–18 869 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL
SPECIFICATIONS CHAPTER 1: INTRODUCTION
SHORT CIRCUIT
Inputs: ...................................................................... RMS Phase Currents
Pickup Level: .........................................................1.00 to 30.00 x CT in steps of 0.01 x CT
Dropout Level:......................................................97 to 98% of Pickup
Pickup Delay:........................................................0.00 to 180.00 s in steps of 0.01 s
Level Accuracy: ................................................... For 1.0 to 2.0 x CT: ±0.5% of reading or ±0.4% of rated,
whichever is greater For > 2.0 x CT: ±1.5% of reading
Operate Time: ......................................................<16 ms @ 60Hz (I > 2.0 x PKP), with 0 ms time delay
<20 ms @ 50Hz (I > 2.0 x PKP), with 0 ms time delay
Timer Accuracy:..................................................±3% of delay setting or ±1/2 cycle (whichever is greater)
from pickup to operate
Elements:................................................................Trip or Alarm
THERMAL MODEL (49)
Thermal Overload Curves:..............................Motor curve, FlexCurve, Standard Motor curve with voltage
dependent function, FlexCurve with voltage dependent
function, IEC curve
Motor Curve Time Multiplier:.........................0.00 to 25.00 in steps of 0.01
FlexCurve Time Multiplier:..............................0.00 to 600.00 in steps of 0.01
IEC Curve Time Constant: ...............................0 to 1000 in steps of 1
Thermal Overload Pickup: ..............................Overload factor x FLA
Overload Factor (OL): ........................................1.00 to 1.50 in steps of 0.01
Motor Full Load Current (FLA): ......................1 to 5000 A in steps of 1
Standard Overload Curve, Cutoff
Effect:.................................................................
Standard Overload Curve, Shift
Effect:.................................................................
Motor Rated Voltage:........................................1 to 50000 V in steps of 1
Thermal Model Biasing: ...................................Current Unbalance, RTDs
Thermal Model Update Rate:........................1 power cycle
Stopped/Running Cool Time Constants:.. 1 to 1000 min. in steps of 1
Stopped/Running Cool Time Constant
Decay: ................................................................Exponential
Hot/Cold Safe Stall Ratio:................................0.01 to 1.00 in steps of 0.01
Current Accuracy: ..............................................Per phase current inputs
Current Source:....................................................True RMS
Timer Accuracy:..................................................±100 ms or ±2%, whichever is greater
Timer Accuracy for Voltage Dependent
Overload:...........................................................±100 ms or ±4%, whichever is greater
UNDERCURRENT (37)
Operating Parameter: ......................................Per-phase current Ia, Ib, Ic (Phasor)
Trip/Alarm Pickup Level:..................................0.10 to 0.95 x FLA in steps of 0.01 x FLA
Dropout Level:......................................................102 to 103% of Pickup
Trip/Alarm Time Delay:....................................0.00 to 180.00 s in steps of 0.01 s
Pickup Accuracy: ................................................For 0.1 to 2.0 x CT: ±0.5% of reading or ±0.4% of rated,
whichever is greater
Operate Time: ...................................................... <45 ms at 60 Hz,<50 ms at 50 Hz
Timer Accuracy:..................................................±3% of delay setting or ± 2 power cycles (whichever is
greater) from pickup to operate
Stages: .....................................................................Trip and Alarm
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