Siemens SG8158-00 manual Appendix B Metering, Accuracy

B

Appendix B: Metering

B Metering

B.1 Accuracy

Table B.1 Metering Accuracies

Parameter						Range	Accuracy
rms Current (L & G)						0-250% In Displayed in Amperes	±1% of measurement from 50-125% of In
							±0.5% of In from 10- 50% of In
Average rms Current						0-250% In Displayed in Amperes	±1% of measurement from 50-125% of In
							±0.5% of In from 10-50% of In
Ampere Demand per Phase						0.. 250% In Displayed in Amperes	±1% of measurement from 50-125% of In
							±0.5% of In from 10-50% of In
Average Ampere Demand						0-250% In Displayed in Amperes	±1% of measurement from 50-125% of In
							±0.5% of In from 10-50% of In
rmsVoltage (L-L and L-N)						10-125% Vn Displayed in kV	±1% of measurement from 50-125% of Vn
							±0.5% of Vn from 10-50% of Vn
Average rms Voltage						10-125% Vn Displayed in kV	±1% of measurement from 50-125% of Vn
							±0.5% of Vn from 10-50% of Vn
Active Power (kW)						0-999,999.99 kW	±2% of measurement from 50-125% of Pn
							±0.1% of V	from 10-50% of P 1, 5
							n	n
kW Demand						0-999,999.99 kWD	±2% of measurement from 50-125% of Pn
							±0.1% of V	from 10-50% of P 1, 5
							n	n
kW Hours						0-999,999.99 kWHR	±2% of measurement from 50-125% of Pn
							±0.1% of V	from 10-50% of P 1, 3, 5
							n	n
Apparent Power (kVA)						0-999,999.99 kVA	±2% of measurement from 50-125% of Pn
							±0.1% of V	from 10-50% of P 1, 5
							n	n
Volt-Amperes Reactive (kVAR)						0-999,999.99 kVAR	±2% of measurement from 50-125% of Pn
							±0.1% of V	from 10-50% of P 1, 2, 5
							n	n
kVAR Hours						0-999,999.99 kVARH	±2% of measurement from 50-125% of Pn
							±0.1% of V	from 10-50% of P 1, 2, 3, 5
							n	n
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 , where V	= VT rating (120 V) and I = CT rating (5A).
				n	n	n

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.

58 Siemens Energy & Automation, Inc.