CHAPTER 1: INTRODUCTION SPECIFICATIONS
869 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL 1–13
NEGATIVE SEQUENCE INSTANTANEOUS OVERCURRENT (50_2)
Current:....................................................................I_2 Fundamental Phasor Magnitude
Pickup Level:..........................................................0.050 to 30.000 x CT in steps of 0.001 x CT
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,
whichever is greater
For > 2.0 x CT: ± 1.5% of reading
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
Overreach:..............................................................< 2%
Operate Time:.......................................................< 12 ms typical at 3 x Pickup at 60 Hz
< 15 ms typical at 3 x Pickup at 50 Hz
Timer Accuracy:...................................................±3% of delay setting or ± ¼ cycle (whichever is greater) from
pickup to operate
PHASE DIRECTIONAL OVERCURRENT (67P)
Relay Connection:...............................................90º(Quadrature)
Quadrature Voltage:..........................................ABC phase seq.: phase A (Vbc), phase B (Vca), phase C (Vab);
ACB phase seq.: phase A (Vcb), phase B (Vac), phase C (Vba)
Polarizing Voltage Threshold:........................0.050 to 3.000 x VT in steps of 0.001 x VT
Current Sensitivity Threshold: .......................0.05 x CT
Characteristic Angle:.........................................0º to 359º in steps of 1°
Angle Accuracy:...................................................± 2º
Operation Time (FlexLogic™ operands): ..Reverse to Forward transition: < 12 ms, typically;
Forward to Reverse transition: <8 ms, typically
NEUTRAL DIRECTIONAL OVERCURRENT (67N)
Directionality:........................................................Co-existing forward and reverse
Polarizing: ...............................................................Voltage, Current, Dual
Polarizing Voltage:..............................................V_0 or VX
Polarizing Current:..............................................Ig
Operating Current: .............................................I_0
Level Sensing:.......................................................3 x (|I_0| – K x |I_1|), Ig
Restraint, K: ...........................................................0.000 to 0.500 in steps of 0.001
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 x CT
Dropout Level: ......................................................97 to 98% of Pickup
Operate Time (no direction transition):.....< 16 ms at 3 x Pickup at 60 Hz
< 20 ms at 3 x Pickup at 50 Hz
PHASE REVERSAL
Phase Reversal Condition: ..............................V
2
/V
1
=100% when phase to phase voltages are greater than
50% of VT
Configuration:.......................................................ABC or ACB phase rotation
Pickup/Dropout Time Delay:..........................0.00 to 180.00 s in steps of 0.01 s
Timer Accuracy:...................................................±3% of delay setting or ±1% cycle (whichever is greater)
from pickup to operate
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