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CHAPTER 1: INTRODUCTION
869 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL
UNDERCURRENT (37)
Operating Parameter:.......................................Per-phase current Ia, Ib, Ic
Pickup Level:..........................................................0.10 to 0.95 x FLA in steps of 0.01 x FLA
Dropout Level: ......................................................102 to 103% of Pickup
Level Accuracy:....................................................For 0.1 to 2.0 x CT: ±0.5% of reading or ±0.4% of rated,
Trip Pickup Delay:................................................0.00 to 180.00 s in steps of 0.01 s
Trip Dropout Delay: ............................................0.00 to 180.00 s in steps of 0.01 s
Alarm Pickup Delay:...........................................0.00 to 180.00 s in steps of 0.01 s
Alarm Dropout Delay: .......................................0.00 to 180.00 s in steps of 0.01 s
Operate Time:.......................................................<45 ms at 60 Hz; <50 ms at 50 Hz
Timer Accuracy:...................................................±3% of delay setting or ± 2 power cycles (whichever is
OVERLOAD ALARM
Operating Parameter:.......................................Average phase current (RMS)
Pickup Level:..........................................................0.50 to 3.00 x FLA in steps of 0.01 x FLA
Dropout Level: ......................................................97 to 98% of Pickup
Level Accuracy:....................................................For 0.1 to 2.0 x CT: ±0.5% of reading or ±0.4% of rated,
Pickup Delay:.........................................................0.00 to 180.00 s in steps of 0.01 s
Dropout Delay: .....................................................0.00 to 180.00 s in steps of 0.01 s
Timer Accuracy:...................................................±3% of delay setting or ± ½ cycle (whichever is greater) from
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,
Operate Time:.......................................................<16 ms @ 60Hz (I > 2.0 x PKP), with 0 ms time delay
Timer Accuracy:...................................................±3% of delay setting or ±1/2 cycle (whichever is greater)
Elements: ................................................................Trip or Alarm
GROUND FAULT (50G)
Pickup Level :.........................................................For 1A/5A Ground CT Type: 0.01 to 10.00 x CT in steps of 0.01
Dropout Level: ......................................................97 to 98% of Pickup
Alarm Pickup Delay:...........................................0.00 to 180.00 s in steps of 0.01 s
Trip Pickup Start Delay: ....................................0.00 to 180.00 s in steps of 0.01 s
Trip Pickup Run Delay: ......................................0.00 to 180.00 s in steps of 0.01 s
Magnitude Accuracy: ........................................50:0.025A CT: ± 5% of reading or ± 0.2A (in primary)
Operate Time:.......................................................<16 ms @ 60Hz (I > 2.0 x PKP), with 0 ms time delay
Timing Accuracy: ................................................±3% of delay setting at ±1 cycle (whichever is greater) from
ACCELERATION TIME (37P)
Acceleration Current: ........................................1.00 to 10.00 x FLA in steps of 0.01
Operating Mode: .................................................Definite Time, Adaptive
Timing Accuracy: ................................................±100 ms or ±0.5% of total time (whichever is greater),
whichever is greater
greater) from pickup to operate
whichever is greater; For > 2.0 × CT rating ±1.5% of reading
pickup to operate
whichever is greater For > 2.0 x CT: ±1.5% of reading
<20 ms @ 50Hz (I > 2.0 x PKP), with 0 ms time delay
from pickup to operate
x CT;
For 50/0.025 Ground CT Type: 0.50 to 15.00 A in steps of
0.01A
whichever is greater
1A/5A CT: For 0.1 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
<20 ms @ 50Hz (I > 2.0 x PKP), with 0 ms time delay
pickup to operate
applicable to definite time mode only
SPECIFICATIONS
1–11
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