CHAPTER 1: INTRODUCTION SPECIFICATIONS
869 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL 1–13
FREQUENCY RATE OF CHANGE (81R)
df/dt Trend:............................................................Increasing, Decreasing, Bi-directional
df/dt Pickup Level: ..............................................0.10 to 15.00 Hz/s in steps of 0.01 Hz/s
df/dt Dropout Level:...........................................96% of Pickup Level
df/dt Level Accuracy:........................................80 mHz/s or 3.5%, whichever is greater
Minimum Frequency:........................................20.00 to 80.00 Hz in steps of 0.01 Hz
Maximum Frequency:.......................................20.00 to 80.00 Hz in steps of 0.01 Hz
Minimum Voltage Threshold:.........................0.000 to 1.250 x VT in steps of 0.001 x VT
Minimum Current Threshold:.........................0.000 to 30.000 x CT in steps of 0.001 x CT
Pickup Time Delay:.............................................0.000 to 6000.000 s in steps of 0.001 s
Timer Accuracy: ..................................................± 3% of delay setting or ± ¼ cycle (whichever is greater)
from pickup to operate
95% Settling Time for df/dt:...........................< 24 cycles
Operate Time:.......................................................typically 10 cycles at 2 × Pickup
GROUND FAULT (50G)
Pickup Level :.........................................................For 1A/5A Ground CT Type: 0.01 to 10.00 x CT in steps of 0.01
x CT;
For 50/0.025 Ground CT Type: 0.50 to 15.00 A in steps of
0.01A
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)
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
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
Timing Accuracy:................................................±3% of delay setting at ±1 cycle (whichever is greater) from
pickup to operate
LOSS OF EXCITATION (40)
Operating Condition:.........................................Positive-sequence impedance
Characteristic: ......................................................2 independent negative mho circles (LOE circle 1, 2)
Circle 1(2) Diameter: ..........................................0.1 to 300.0 Ω (in secondary) in steps of 0.1Ω
Circle 1(2) Offset: .................................................0.1 to 300.0 Ω (in secondary) in steps of 0.1Ω
Reach (Impedance) Accuracy:......................± 5%
Under Voltage (UV) Supervision Level: ......0.00 to 1.50 x VT in steps of 0.01 x VT
UV Pickup Accuracy: .........................................as per phase voltage inputs
Pickup Delay: ........................................................0.00 to 600.00 s in steps of 0.01 s
Timer Accuracy: ..................................................± 3% of delay setting or ± ½ cycle (whichever is greater)
Operate Time:.......................................................< 3 cycles
MECHANICAL JAM
Operating Condition:.........................................Phase Overcurrent
Arming Condition:...............................................Motor not starting
Pickup Level:..........................................................1.00 to 10.00 x FLA in steps of 0.01
Dropout Level: ......................................................97 to 98% of Pickup
Level Accuracy:....................................................For 0.1 to 2.0 x CT: ±0.5% of reading; at > 2.0 x CT rating:
±1.5% of reading
Pickup Delay: ........................................................0.10 to 180.00 s in steps of 0.01
Dropout Delay:.....................................................0.00 to 180.00 s in steps of 0.01
Timer Accuracy: ..................................................±3% of delay setting time or ±20 ms, whichever is greater
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