CHAPTER 1: INTRODUCTION SPECIFICATIONS
850 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL 1–17
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
To Next Page
Loading...
