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4 Measurands and Characteristics
4.1 Measurands
28
SICAM MMU 7KG9663, Device Manual
E50417-H1040-C514-A3, Edition 01.2016
4.1
Measurands
4.1.1
Measurands in 1-phase Systems
The SICAM MMU can measure or calculate the following measurands in 1-phase systems. Chapter 4.1.3 con-
tains a detailed list of all measurands.
Measured and Calculated Quantities
The operational quantities AC voltage V
ph
,
AC current I
P
and frequency f are measured directly. All other op-
erational measurands, power and energy quantities are calculated from the measured operational quantities.
Operational Measurands
SICAM MMU measures or calculates the following operational quantities:
•
AC voltage V
ph
(mains voltage referred to the neutral conductor/protective ground N; RMS value): Va
•
Voltage harmonic: HVa
•
AC current I
P
(current through the conductor, RMS value): Ia
•
Current harmonic: HIa
•
Active power factor cos
ϕ
: cos
ϕ
(a)
•
Power factor PF: PFa
•
Phase angle
ϕ
:
ϕ
a
•
Frequency (power frequency): f
Power Quantities
SICAM MMU calculates the following power values from the measured operational quantities:
•
Active power P: Pa
•
Reactive power Q: Qa
•
Apparent power S: Sa
Energy Quantities
SICAM MMU calculates the following energy values from the measured operational quantities:
•
Active energy WP: WPa (supply and demand)
•
Reactive energy WQ: WQa (inductive and capacitive)
•
Apparent energy WS: WSa
SICAM-MMU_7KG9663_US.book Page 28 Monday, December 7, 2015 12:22 PM