Measurands; Measurands In 1-Phase Systems - Siemens SICAM MMU 7KG9663 Device Manual

4 Measurands and Characteristics

4.1 Measurands

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
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
• Voltage harmonic: HVa
• AC current I
• Current harmonic: HIa
Active power factor cos ϕ: cos ϕ (a)
•
• Power factor PF: PFa
Phase angle ϕ: ϕa
•
• 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
28
, AC current I
ph
(mains voltage referred to the neutral conductor/protective ground N; RMS value): Va
ph
(current through the conductor, RMS value): Ia
P
and frequency f are measured directly. All other op-
P
SICAM MMU 7KG9663, Device Manual
E50417-H1040-C514-A3, Edition 01.2016