1–10 350 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
SPECIFICATIONS CHAPTER 1: INTRODUCTION
DIRECTIONAL POWER (32)
Measured power:................................................ 3-phase
Characteristic angle:......................................... 0º to 359º in steps of 1°
Power pickup range: ......................................... -1.200 to 1.200 x Rated Power in steps of 0.001
Pickup level accuracy:...................................... 2.5% or 0.01 pu, whichever is greater
Hysteresis: ............................................................. 2% or 0.001 x Rated Power, whichever is greater
Pickup time delay:.............................................. 0.0 to 600.0 s in steps of 0.1 s
Operate time:........................................................ < 55 ms at 1.1 x pickup at 60 Hz
< 65 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
VOLTS PER HERTZ (24)
Inputs: ...................................................................... Van (Wye VTs), Vab (Delta VTs)
Pickup Level: ......................................................... 0.80 to 4.00 x V/Hz in steps of 0.01 x V/Hz
Dropout Level:...................................................... 97% to 98% of pickup
Level Accuracy: ................................................... ± 0.02 x V/Hz or 2% of set value, whichever is greater
Time Curves: ......................................................... Definite Time, Inverse A/B/C, FlexCurves A/B
TD Multiplier: ......................................................... 0.00 to 600.00 s in steps of 0.01 s
Reset Delay: .......................................................... 0.00 to 600.00 s in steps of 0.01 s
Time Accuracy:.................................................... ± 3% of operate time of ±15 cycles (whichever is greater) for
values greater than 1.1 x pickup
PHASE/NEUTRAL/GROUND/NEGATIVE SEQUENCE TIME OVERCURRENT (51P/51N/51G/
51_2)
Pickup Level: ......................................................... 0.05 to 20.00 x CT in steps of 0.01 x CT
Dropout Level:...................................................... 97% of Pickup @ I > 1 x CT
Pickup - 0.02 x CT @ I < 1 x CT
Curve Shape:......................................................... ANSI Extremely/Very/Moderately/Normally Inverse
Definite Time (0.1 s base curve)
IEC Curve A/B/C and Short Inverse
IAC Extreme/Very/-/Short Inverse
User Curve, FlexCurve™ A/B (programmable curves)
Curve Multiplier: .................................................. 0.05 to 50.00 in steps of 0.01
Reset Time:............................................................ Instantaneous, Linear
Curve Timing Accuracy:.................................. ±3% of expected inverse time or 1.5 cycle, whichever is
greater, from pickup to operate
Level Accuracy: ................................................... per CT input
SENSITIVE GROUND TIME OVERCURRENT (51SG)
Pickup Level: ......................................................... 0.005 to 3.000 x CT in steps of 0.001 x CT
Dropout Level:...................................................... 97% of Pickup @ I > 0.1 x CT
Pickup - 0.002 x CT @ I < 0.1 x CT
Curve Shape:......................................................... ANSI Extremely/Very/Moderately/Normally Inverse
Definite Time (0.1 s base curve)
IEC Curve A/B/C/Short Inverse
IAC Extreme/Very/-/Short Inverse
User Curve, FlexCurve™ A/B
Curve Multiplier: .................................................. 0.05 to 50.00 in steps of 0.01
Reset Time:............................................................ Instantaneous, Linear
Curve Timing Accuracy:.................................. ±3% of expected inverse time or 1 cycle, whichever is
greater, from pickup to operate
Level Accuracy: ................................................... per CT input
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