GE 850 Instruction Manual page 32

SPECIFICATIONS
NOTE:
NOTE
1–24
Voltages
Parameters:........................................................... Wye VTs: A-n, B-n, C-n, A-B, B-C, C-A, Average Phase, Neutral
Magnitude Accuracy:........................................ ± 0.5% of reading from 15 to 208 V;
Angle Accuracy:................................................... 0.5° (15 V <V < 208 V)
FREQUENCY
Range:...................................................................... 2.000 to 90.000 Hz
Accuracy at: .......................................................... V = 15 to 208 V: ± 0.01 Hz (input frequency 15 to 70 Hz);
CURRENT AND VOLTAGE HARMONICS
Parameters:........................................................... Magnitude of each harmonic and THD
Range:...................................................................... 2
DEMAND
Measured Values: ............................................... Phase A/B/C present and maximum current
Measurement Type:........................................... Thermal Exponential, 90% response time (programmed): 5,
Current Pickup Level: ........................................ 10 to 10000 in steps of 1 A
Dropout Level:...................................................... 96-98% of Pickup level
Level Accuracy:.................................................... ± 2%
Factory tested at 25°C
and Residual;
Delta VTs: A-B, B-C, C-A, Neutral and Residual
± 1% for open Delta connections;
± 10% for 25 Hz with 150 V <V < 208V
I = 0.1 to 0.4 x CT: ± 0.020 Hz (input frequency 15 to 70 Hz);
I > 0.4 x CT: ± 0.01 Hz (input frequency 15 to 70 Hz)
nd th
to 25 harmonic: per-phase displayed as % of f
fundamental frequency
THD: per-phase displayed as % of f
10, 15, 20, 30 minutes
Block Interval / Rolling Demand, time interval (programmed):
5, 10, 15, 20, 30 minutes
850 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 1: INTRODUCTION
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