Siemens ISGS SG8158-00 - Manual (Page 64)

Appendix B: Metering
58 Siemens Energy & Automation, Inc.
B Metering
B.1 Accuracy
Table B.1 Metering Accuracies
Parameter Range Accuracy
rms Current (L & G) 0-250% I
n
Displayed in Amperes ±1% of measurement from 50-125% of I
n
±0.5% of I
n
from 10- 50% of I
n
Average rms Current 0-250% I
n
Displayed in Amperes ±1% of measurement from 50-125% of I
n
±0.5% of I
n
from 10-50% of I
n
Ampere Demand per Phase 0.. 250% I
n
Displayed in Amperes ±1% of measurement from 50-125% of I
n
±0.5% of I
n
from 10-50% of I
n
Average Ampere Demand 0-250% I
n
Displayed in Amperes ±1% of measurement from 50-125% of I
n
±0.5% of I
n
from 10-50% of I
n
rmsVoltage (L-L and L-N) 10-125% V
n
Displayed in kV ±1% of measurement from 50-125% of V
n
±0.5% of V
n
from 10-50% of V
n
Average rms Voltage 10-125% V
n
Displayed in kV ±1% of measurement from 50-125% of V
n
±0.5% of V
n
from 10-50% of V
n
Active Power (kW) 0-999,999.99 kW ±2% of measurement from 50-125% of P
n
±0.1% of V
n
from 10-50% of P
n
1, 5
kW Demand 0-999,999.99 kWD ±2% of measurement from 50-125% of P
n
±0.1% of V
n
from 10-50% of P
n
1, 5
kW Hours 0-999,999.99 kWHR ±2% of measurement from 50-125% of P
n
±0.1% of V
n
from 10-50% of P
n
1, 3, 5
Apparent Power (kVA) 0-999,999.99 kVA ±2% of measurement from 50-125% of P
n
±0.1% of V
n
from 10-50% of P
n
1, 5
Volt-Amperes Reactive (kVAR) 0-999,999.99 kVAR ±2% of measurement from 50-125% of P
n
±0.1% of V
n
from 10-50% of P
n
1, 2, 5
kVAR Hours 0-999,999.99 kVARH ±2% of measurement from 50-125% of P
n
±0.1% of V
n
from 10-50% of P
n
1, 2, 3, 5
Power Factor -1- 0-+1 ±0.04 4
Frequency 45-65 Hz ±0.1% of reading providing voltage is 50% VT primary rating
1 Measured at PF=1. For |PF|<1, ±2% + angle error (±2% for |PF| ≥ 0.7)
2 Measured at PF=0. For |PF|>0, ±2% + angle error (±2% for |PF| ≤ 0.7)
3 Energy is accumulated in either kHR or MHR, selectable (parameter).
4 For power factor, 1 is considered “perfect,” negative is leading and positive is lagging.
5 P
n
= V
n
x I
n
, where V
n
= VT rating (120 V) and I
n
= CT rating (5A).
Note for all values: Stated accuracy applies only when the device is not in pickup. These measurements are valid over a frequency range of
45- 65Hz and include fundamental, second harmonic, and all odd harmonics up to the 13th harmonic of the fundamental line frequency.
B
isv3o_1.bk : isv3oxmt.frm Page 58 Wednesday, August 7, 1996 10:51 AM