Siemens Sicam P850 7KG85 Series - Measurands; Measurands in 1-Phase Systems

4 Measurands and Recording
4.2 Measurands
43SICAM P850/P855, 7KG85xx, Device Manual
E50417-H1040-C482-A6, Edition 10.2018
4.2 Measurands
4.2.1 Measurands in 1-phase Systems
The SICAM P850/P855 can measure and calculate quantities in 1-phase systems, Chapter 4.2.3 contains a
detailed list of all measurands.
Measured and Calculated Quantities
The operational measurands alternating voltage V
P
, alternating current I
P
, and frequency are measured. All
other operational measurands, harmonics, THDS (Subgroup Total Harmonic Distortion), and power and energy
types are calculated from the measured operational measurands.
Operational Measured Values
• Alternating voltage V
ph
(mains voltage referred to the neutral conductor/protective ground N; RMS value):
Va
• Alternating current I
P
(current through the conductor, RMS value): Ia
• Active power factor cos : cos (a)
• Power factor PF: PFa
• Phase angle : a
• Frequency (system frequency): f
• Flicker (only SICAM P855): Pst, Plt
Harmonics
• Fundamental V
• Harmonics V, magnitude: H_Va-x
• Fundamental I
• Harmonics I, magnitude: H_Ia-x
• Subgroup Total Harmonic Distortion V: THDS_Va
• Subgroup Total Harmonic Distortion I: THDS_Ia
Power Quantities
• Active power P: Pa
• Reactive power Q: Qa
• Reactive power (fundamental) Q1: Q1a
• Apparent power S: Sa
Energy Quantities
• Active energy WP: WPa (supply and demand)
• Reactive energy WQ: WQa (inductive and capacitive)
• Apparent energy WS: WSa