70 Appendix A Technical Specifications
Accuracy, % Parameter
Full scale
Rdg FS Conditions
Range Display resolution (%Rdg)
@
range
2
Apparent energy Under conditions of Class 0.5S
(IEC 687-1992-6)
1
0 to
999,999 MVAh
1 kVAh
@
1 to 999,999 kVAh
10 kVAh
@
1000 to 9,999.99 MVAh
100 kVAh
@
10,000 to 99,999.9 MVAh
1MVAh
@
100,000 to 999,999 MVAh
PT = external potential transformer ratio CT, CT Primary Current = primary current rating of external current transformer
FSU = voltage full scale FSI = current full scale U
1
= voltage fundamental I
1
= current fundamental
1
Voltage 70% to 120% FS and current 2% to 120% FS
2
Higher resolution is achievable via communications
3
Fundamental voltage 70% to 110% FS and fundamental current 10% to 100% FS, voltage THD ≥ 5%, current THD ≥ 10% up to
20
th
harmonic.
Additional Notes
1. Accuracy is expressed as ± (percentage of reading + percentage of full scale) ± 1 digit. This does not include inaccuracies
introduced by the user's potential and current transformers.
2. Specifications assume: voltage and current waveforms with THD ≤ 5% for kvar, kVA and PF; reference operating temperature:
20-26°C.
3. Ordinary measurement error is considerably less than the specified accuracy which indicates maximum error.
4. Harmonic real time values assume errors averaged over 10-20 readings.
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