CHAPTER 1: INTRODUCTION SPECIFICATIONS
850 FEEDER 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 DIRECTIONAL OVERCURRENT (67G)
Directionality: .......................................................Co-existing forward and reverse
Polarizing: ...............................................................Voltage, Current, Dual
Polarizing Voltage:..............................................V_0 or VX
Polarizing Current:..............................................Isg
Operating Current: .............................................Ig
Level Sensing:.......................................................Ig, Isg
Characteristic Angle:.........................................-90º to 90º in steps of 1°
Limit Angle: ............................................................40º to 90º in steps of 1°, independent for forward and
reverse
Angle Accuracy: ..................................................±2º
Pickup Level:..........................................................0.050 to 30.000 x CT in steps of 0.001
Dropout Level: ......................................................97 to 98%
Operate Time (no direction transition):.....< 12 ms typical at 3 x Pickup at 60 Hz
< 15 ms typical at 3 x Pickup at 50 Hz
LOAD ENCROACHMENT
Operating Parameter:.......................................Positive sequence impedance (V1/I1)
Reach (in secondary Ω):...................................0.02 to 250.00 Ω in steps of 0.01Ω
Angle:........................................................................5º to 50º in steps of 1°
Minimum Voltage:...............................................0.00 to 1.50 x VT in steps of 0.01 x VT
Impedance Accuracy: ......................................± 5%
Angle Accuracy: ..................................................± 2º
Pickup Time Delay:.............................................0.000 to 6000.000 s in steps of 0.001 s
Dropout Time Delay: .........................................0.000 to 6000.000 s in steps of 0.001 s
Operate Time:.......................................................<20 ms at 1.1 x pickup at 60 Hz
<24 ms at 1.1 x pickup at 50 Hz
Timing Accuracy:................................................± 3% of delay setting or ± ¼ cycle (whichever is greater)
from pickup to operate
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