GE 850 - Page 32

1–22 850 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
SPECIFICATIONS CHAPTER 1: INTRODUCTION
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
PHASE UNDERVOLTAGE (27P)
Voltage:....................................................................Fundamental Phasor Magnitude
Minimum Voltage: ..............................................0.00 to 1.50 x VT in steps of 0.01 x VT
Pickup Level: .........................................................0.00 to 1.50 x VT in steps of 0.01 x VT
Dropout Level:......................................................102 to 103% of Pickup
Level Accuracy: ................................................... ±0.5% of reading from 10 to 208 V
Phases Required for Operation:...................Any one, Any two, All three
Undervoltage Curves:.......................................Definite Time, GE IAV Inverse Time or FlexCurves A/B/C/D
Pickup Time Delay: ............................................ 0.000 to 6000.000 s in steps of 0.001s
Operate Time: ......................................................< 20 ms at 0.90 x pickup at 60 Hz
< 25 ms at 0.90 x pickup at 50 Hz
Curve Timing Accuracy:.................................. at < 0.90 x pickup: ± 3.5% of curve delay or ± ½ cycle
(whichever is greater) from pickup to operate
PHASE OVERVOLTAGE (59P)
Voltage:....................................................................Fundamental Phasor Magnitude
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
Phases Required for Operation:...................Any one, Any two, All three
Pickup Time Delay: ............................................ 0.000 to 6000.000 s in steps of 0.001s (Definite Time)
Dropout Time Delay:.........................................0.000 to 6000.000 s in steps of 0.001s (Definite Time)
Pickup Accuracy: ................................................Per phase voltage input channel error
Operate Time: ......................................................< 25 ms at 1.1 x pickup at 60Hz
< 30 ms at 1.1 x pickup at 50Hz
Timer Accuracy:.................................................. ± 3% of delay setting or ± ¼ cycle (whichever is greater)
from pickup to operate
RESTRICTED GROUND (EARTH) FAULT (87G)
Operating Parameter: ...................................... Ia, Ib, Ic and Ig (Fundamental Phasor Magnitude)
Pickup Level: .........................................................0.050 to 30.000 x CT in steps of 0.001 x CT (phase CT)
Ground Supervision Level:.............................. 0.050 to 30.000 x CT in steps of 0.001 x CT (ground CT)
Dropout Level:......................................................97 to 98% of Pickup
Slope Range:.........................................................0 to 100% in steps of 1%
Pickup Delay:........................................................ 0.000 to 6000.000 s in steps of 0.001 s
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
Operate Time: ......................................................<25 ms at 1.1 x slope x Imax at 60 Hz, typically
<30 ms at 1.1 x slope x Imax at 50 Hz, typically
Timing Accuracy:................................................±3% of delay setting or ± ¼ cycle (whichever is greater) from
pickup to operate
RTD PROTECTION
Pickup:......................................................................1°C to 250°C in steps of 1°C
Hysteresis: ............................................................. 2°C
Timer Accuracy:..................................................<2 s
Elements:................................................................Trip and Alarm