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