12-4 IM 760301-01E
Measurement Functions (Σ Functions) Determined for Each Wiring Unit (ΣA and ΣB)
For details on the determination and equations of Σ functions, see appendix 1.
Item Symbol and Meaning
Voltage (V) UrmsΣ: true rms value, UmnΣ: rectified mean value calibrated to the rms value, UdcΣ: simple
average, UrmnΣ: rectified mean value
Current (A) IrmsΣ: true rms value, ImnΣ: rectified mean value calibrated to the rms value, IdcΣ: simple average,
IrmnΣ: rectified mean value
Active power (W) PΣ
Apparent power (VA) SΣ
Reactive power (var) QΣ
Power factor λS
Phase difference (° ) φS
Corrected Power (W) PcΣ
(Applicable standard IEC76-1(1976), IEEE C57.12.90-1993, IEC76-1(1993))
Integration Time: Integration time
WPΣ: Sum of positive and negative watt hours
WP+Σ: Sum of positive P (consumed watt hour)
WP-Σ: Sum of negative P (watt hour returned to the power supply)
qΣ: Sum of positive and negative ampere hours
q+Σ: Sum of positive I (ampere hour)
q-Σ: Sum of negative I (ampere hour)
WSΣ: Integration of SΣ
WQΣ: Integration of QΣ
For details on the measurement functions of motor evaluation, see section 1.10 in the
Expansion Function User’s Manual IM760301-51E
.
For details on the measurement functions of harmonic measurement, see section 7.11
in the
Expansion Function User’s Manual IM760301-51E
.
12.3 Measurement Functions (Measurement Items) Related to Normal Measurement
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