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CHAPTER 1: INTRODUCTION
Metering
850 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
RMS PARAMETERS
Currents
Parameters:...........................................................Phase A, B, C, Neutral, Ground
Accuracy: ................................................................± 0.25% of reading or ± 0.2% of rated (whichever is greater)
Voltages
Parameters:...........................................................Wye VTs: A-n, B-n, C-n, A-B, B-C, C-A, Average Phase, Neutral
Accuracy: ................................................................± 0.5% of reading from 15 to 208 V
Real Power (Watts)
Range: ......................................................................-214748364.8 kW to 214748364.7 kW
Parameters:...........................................................3-phase; per phase if VT is Wye
Accuracy: ................................................................± 1.0% of reading or 0.2 kW (whichever is greater) at -0.8 <
Reactive Power (Vars)
Range: ......................................................................-214748364.8 kvar to 214748364.7 kvar
Parameters:...........................................................3-phase; per phase if VT is Wye
Accuracy: ................................................................± 1.0% of reading or 0.2 kvar (whichever is greater) at -0.2 <
Apparent Power (VA)
Range: ......................................................................0 kVA to 214748364.7 kVA
Parameters:...........................................................3-phase; per phase if VT is Wye
Accuracy: ................................................................± 1.0% of reading or 0.2 kVA (whichever is greater)
Power Factor
Parameters:...........................................................3-phase; per phase if VT is Wye
Range: ......................................................................0.01 Lag to 1.00 to 0.01 Lead
Accuracy: ................................................................± 0.02 for 50 Hz and 60 Hz; ± 0.05 for 25 Hz
Watt-hours (positive and negative)
Range: ......................................................................- 2147483.648 MWh to 2147483.647 MWh
Parameters:...........................................................3-phase only
Update Rate: .........................................................50 ms
Accuracy: ................................................................± 2.0% of reading
Var-hours (positive and negative)
Range: ......................................................................- 2147483.648 Mvarh to 2147483.647 Mvarh
Parameters:...........................................................3-phase only
Update Rate: .........................................................50 ms
Accuracy: ................................................................± 2.0% of reading
PHASORS
Current
Parameters:...........................................................Phase A, B, C, Neutral and Ground
Magnitude Accuracy: ........................................± 0.5% of reading or ± 0.2% of rated (whichever is greater)
Angle Accuracy:...................................................2° (3° for 25 Hz)
from 0.1 to 2.0 x CT
± 1% of reading > 2.0 x CT
and Residual
Delta VTs: A-B, B-C, C-A, Neutral and Residual
± 1% for open Delta connections
PF ≤ -1.0 and 0.8 < PF < 1.0
PF ≤ 0.2
from 0.1 to 2.0 x CT
± 1.0% of reading > 2.0 x CT
SPECIFICATIONS
1–23
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