Measurands In 3-Wire And 4-Wire Networks - Siemens SENTRON PAC5200 Device Manual

4 Measurands and Recording
4.2 Measurands
4.2.2

Measurands in 3-wire and 4-wire Networks

The Digital Transducer SENTRON PAC5100/5200 can measure or calculate the following quantities in 3-wire
and
4-wire networks (delta and star connection): Chapter 4.2.3 contains a detailed list of all measurands.
Measured and Calculated Quantities
The operational quantities alternating voltage V
alternating voltage across the neutral conductor V
operational measurands, harmonics, THDS (Subgroup Total Harmonic Distortion), power and energy
quantities are calculated from the measured operational quantities.
Operational Measurands
• Alternating voltage phase-neutral conductor (neutral conductor connected to protective conductor; star
connection) V
• Alternating voltage phase-phase (delta connection) V
• Alternating voltage across the neutral conductor: V
• Unbalanced voltage: U
• Mean value of the 3 phase-ground voltages: V
• Alternating current I
• Current in neutral conductor: I
• Unbalanced current: I
• Mean value of the 3 phase currents: I
• Active power factor cos : cos (a), cos (b), cos (c), cos 
• Power factor PF: PFa, PFb, PFc, PF
• Phase angle : a, b, c, 
• Frequency (power frequency): f (see Table 4-17)
• Flicker (only SENTRON PAC5200): Pst, Plt
Harmonics
• Fundamental V
• Harmonics V, magnitude: H_Va-x, H_Vb-x, H_Vc-x
• Fundamental I
• Harmonics I, magnitude: H_Ia-x, H_Ib-x, H_Ic-x
• Subgroup Total Harmonic Distortion V: THDS_Va, THDS_Vb, THDS_Vc and
when 3-wire network is selected: THDS_Vab, THDS_Vbc, THDS_Vca
• Subgroup Total Harmonic Distortion I: THDS_Ia, THDS_Ib, THDS_Ic
Power Quantities
• Active power P: Pa, Pb, Pc, P
• Reactive power Q: Qa, Qb, Qc, Q
• Reactive power (fundamental) Q1: Q1a, Q1b, Q1c, Q1
• Apparent power S: Sa, Sb, Sc, S
Energy Quantities
• Active energy WP: WPa, WPb, WPc, WP (for supply and demand respectively)
• Reactive energy WQ: WQa, WQb, WQc, WQ (inductive and capacitive respectively)
• Apparent energy WS: WSa, WSb, WSc, WS
40
: Va, Vb, Vc
ph-N
2
(current through the conductor): Ia, Ib, Ic
P
N
unbal
avg
, alternating voltage V
ph-N ph-ph
, and frequency f are measured directly. All other
N
: Vab, Vbc, Vca
ph-ph
N
avg
SENTRON PAC5100/5200, 7KM5212/5412, Device Manual
E50417-H1040-C568-A1, Edition 03.2015
, alternating current I ,
ph