YOKOGAWA WT1800 User Manual page 88

6.3 Displayed Items
Measurement Functions (Σ Functions) Determined for Each Wiring Unit (ΣA, ΣB, and ΣC)
For details about how Σ function values are computed and determined, see appendix 1.
Item
Voltage (V)
Current (A)
Active power (W)
Apparent power (VA)
Reactive power (var)
Power factor
Phase difference (°)
Corrected power(W)
Integration
6-4
Symbols and Meanings
UrmsΣ: true rms value, UmnΣ: rectified mean value calibrated to the rms value, UdcΣ: simple
average, UrmnΣ: rectified mean value, UacΣ: AC component
IrmsΣ: true rms value, ImnΣ: rectified mean value calibrated to the rms value, IdcΣ: simple average,
IrmnΣ: rectified mean value, IacΣ: AC component
PΣ
SΣ
QΣ
λΣ
ΦΣ
PcΣ
Applicable standards
IEC76-1 (1976), IEC76-1 (1993)
WPΣ: sum of positive and negative watt hours
WP+Σ: sum of positive P (consumed watt hours)
WP-Σ: sum of negative P (watt hours returned to the power supply)
qΣ: sum of positive and negative ampere hours
q+Σ: sum of positive I (ampere hours)
q-Σ: sum of negative I (ampere hours)
WSΣ: integrated value of SΣ
WQΣ: integrated value of QΣ
IM WT1801-03EN