GE 845 Instruction Manual page 25

CHAPTER 1: INTRODUCTION
845 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
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
Curve Timing Accuracy: ..................................at > 1.1 x Pickup: ± 3% of curve delay or ± 1 cycle (whichever
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
Timer Accuracy: .................................................. ± 3% of delay setting or ± ¼ cycle (whichever is greater)
VOLTS PER HERTZ (24)
Voltages:..................................................................Phasor only
Pickup Level:..........................................................0.80 to 4.00 in steps of 0.01 pu
Dropout Level: ......................................................97 to 98% of pickup
Level Accuracy:....................................................±0.02 pu
Timing Curves: .....................................................Definite Time; IEC Inverse A/B/C; FlexCurves A, B, C, and D
TD Multiplier: .........................................................0.05 to 600.00 s in steps of 0.01
Reset Delay:...........................................................0.00 to 6000.000 s in steps of 0.01
Timer Accuracy: ..................................................±3% of operate time or ±15 cycles (whichever is greater) for
Number of Elements: ........................................2
Number of Elements: ........................................1
DIRECTIONAL POWER (32)
Measured Power: ................................................3-phase
Number of Stages:..............................................2
Characteristic Angle:.........................................0º to 359º in steps of 1°
Calibration Angle: ...............................................0.00º to 0.95º in steps of 0.05°
Power Pickup Range:.........................................–1.200 to 1.200 x Rated Power in steps of 0.001
Pickup Level Accuracy: ....................................± 1% or ± 0.001 x Rated Power, whichever is greater
Hysteresis:..............................................................2% or 0.001 x Rated Power, whichever is greater
Pickup Time Delay:.............................................0.000 to 6000.000 s in steps of 0.001 s
Operate Time:.......................................................< 55 ms at 1.1 x pickup at 60 Hz
Timer Accuracy: ..................................................± 3% of delay setting or ± ¼ cycle (whichever is greater)
< 30 ms at 1.1 x pickup at 50Hz
is greater) from pickup to operate
< 30 ms at 1.1 x pickup at 50 Hz
from pickup to operate
values greater than 1.1 x pickup
< 65 ms at 1.1 x pickup at 50 Hz
from pickup to operate
SPECIFICATIONS
1–15