1–14 869 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL
SPECIFICATIONS CHAPTER 1: INTRODUCTION
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
NEGATIVE SEQUENCE OVERVOLTAGE (59_2)
Operating Parameter: ......................................V_2
Pickup Level: .........................................................0.00 to 3.00 x VT in steps of 0.01 x VT
Dropout Level:......................................................97 to 98% of Pickup
Level Accuracy: ................................................... ± 0.5% of reading from 10 to 208 V
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: ...................................................... < 25 ms at 1.1 x pickup at 60 Hz
< 30 ms at 1.1 x pickup at 50 Hz
Timer Accuracy:.................................................. ± 3% of delay setting or ± ¼ cycle (whichever is greater)
from pickup to operate
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
NEUTRAL OVERVOLTAGE (59N)
Operating Parameter: ......................................3V_0 calculated from phase to ground voltages
Pickup Level: .........................................................0.02 to 3.00 x VT in steps of 0.01 x VT
Dropout Level:......................................................97 to 98% of Pickup
Level Accuracy: ................................................... ±0.5% of reading from 10 to 208 V
Neutral Overvoltage Curves:......................... Definite time, FlexCurve A,B,C,D
Pickup Time Delay: ............................................0.000 to 6000.000 s in steps of 0.001 s (Definite Time)
Dropout Time Delay:.........................................0.000 to 6000.000 s in steps of 0.001 s (Definite Time)
Operate Time: ...................................................... < 25 ms at 1.1 x pickup at 60Hz
< 30 ms at 1.1 x pickup at 50Hz
Curve Timing Accuracy:..................................at > 1.1 x Pickup: ± 3% of curve delay or ± 1 cycle (whichever
is greater) from pickup to operate
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