1–12 339 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL
SPECIFICATIONS CHAPTER 1: INTRODUCTION
PHASE REVERSAL (47)
Configuration: ...................................................... ABC or ACB phase rotation
Time Delay: ........................................................... 100 ms
Timing Accuracy:................................................ ±0.5 s
Elements:................................................................ Trip or Alarm
UNDERFREQUENCY (81U)
Minimum Voltage: .............................................. 0.00 to 1.25 x VT in steps of 0.01
Pickup Level: ......................................................... 40.00 to 70.00 Hz in steps of 0.01
Dropout Level:...................................................... Pickup +0.05 Hz
Time Delay: ........................................................... 0.1 to 600.0 s in steps of 0.01
Timing Accuracy:................................................ ±0.5 s or ±0.5% of total time
Level Accuracy: ................................................... ±0.03 Hz
Elements:................................................................ Trip and Alarm
OVERFREQUENCY (81O)
Minimum Voltage: .............................................. 0.3 x VT
Pickup Level: ......................................................... 40.00 to 70.00 Hz in steps of 0.01
Dropout Level:...................................................... Pickup - 0.05 Hz
Time Delay: ........................................................... 0.1 to 600.0 s in steps of 0.01
Timing Accuracy:................................................ ±0.5 s or ±0.5% of total time
Level Accuracy: ................................................... ±0.03 Hz
Elements:................................................................ Trip and Alarm
ACCELERATION TIME TRIP (48)
Pickup Level: ......................................................... Motor start condition
Dropout Level:...................................................... Motor run, trip, or stop condition
Timers for single-speed:.................................. Stopped to running
Timers for two-speed:...................................... Stopped to high speed, stopped to low speed, low to high
speed
Time Delay: ........................................................... 1.0 to 250.0 s in steps of 0.1
Timing Accuracy:................................................ ±200 ms or ±1% of total time
Metering
NOTE:
Negative values (-) represent lead and positive values (+) represent lag.
PARAMETER ACCURACY
(full scale for
CT Input is 3 x CT)
RESOLUTION RANGE
3-Phase Real Power (MW or kW) ±1% of full scale 0.1 MW ± 100000.0 kW
3-Phase Reactive Power (Mvar or kvar) ±1% of full scale 0.1 Mvar ± 100000.0 kvar
3-Phase Apparent Power (MVA or kVA) ±1% of full scale 0.1 MVA ± 100000.0 kVA
3-Phase Positive Watthour (MWh) ±1% of full scale ±0.001 MWh 50000.0 MWh
3-Phase Negative Watthour (MWh) ±1% of full scale ±0.001 MWh 50000.0 MWh
3-Phase Positive Varhour (Mvarh) ±1% of full scale ±0.001 Mvarh 50000.0 Mvarh
3-Phase Negative Varhour (Mvarh) ±1% of full scale ±0.001 Mvarh 50000.0 Mvarh
Power Factor ±0.05 0.01 -0.99 to 1.00
Frequency ±0.05 Hz 0.01 Hz 40.00 to 70.00 Hz