YOKOGAWA WT500 User Manual page 305

14.3 Normal Measurement Functions (Measured Items)
Measurement Functions Determined for Each Wiring Unit (
Item
Voltage (V)
Current (A)
Active power (W)
Apparent power (VA)
Reactive power (var)
Power factor
Phase difference (°)
Integration
You can select to integrate the ampere hours using Irms, Imn, Idc, Irmn, or Iac.
14-4
For details about how Σ function values are computed and determined, see appendix 1.
Symbols and Meanings
Σ
Urms : true rms value, Umn
Σ
average, Urmn : rectified mean value, Uac
Σ
Irms : true rms value, Imn
Σ
Irmn : rectified mean value, Iac
Σ
P
Σ
S
Σ
Q
λΣ
fΣ
Time: Integration time
Σ
WP : Sum of positive and negative watt hours
Σ
WP+ : Sum of positive P (consumed watt hours)
Σ
WP– : Sum of negative P (watt hours returned to the power supply)
Σ
q : Sum of positive and negative ampere hours
Σ
q+ : Sum of positive I (ampere hours)
Σ
q– : Sum of negative I (ampere hours)
Σ
WS : Integrated value of S
Σ
WQ : Integrated value of Q
Σ
: rectified mean value calibrated to the rms value, Udc
Σ
: AC component
Σ
: rectified mean value calibrated to the rms value, Idc
Σ
: AC component
Σ
Σ
Functions)
Σ
Σ
: simple
Σ
: simple average,
IM 760201-01E