12-4
IM 760301-01E
Measurement Functions (
Σ
Functions) Determined for Each Wiring Unit (
Σ
A and
Σ
B)
For details on the determination and equations of
Σ
functions, see appendix 1.
Item
Symbol and Meaning
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
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
Active power (W)
P
Σ
Apparent power (VA)
S
Σ
Reactive power (var)
Q
Σ
Power factor
λ
S
Phase difference (
°
)
φ
S
Corrected Power (W)
Pc
Σ
(Applicable standard IEC76-1(1976), IEEE C57.12.90-1993, IEC76-1(1993))
Integration
Time:
Integration time
WP
Σ
:
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)
q
Σ
:
Sum of positive and negative ampere hours
q+
Σ
:
Sum of positive I (ampere hour)
q-
Σ
:
Sum of negative I (ampere hour)
WS
Σ
:
Integration of S
Σ
WQ
Σ
:
Integration of Q
Σ
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