4 Measurands and Recording
4.2 Measurands
40
SENTRON PAC5100/5200, 7KM5212/5412, Device Manual
E50417-H1040-C568-A1, Edition 03.2015
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
ph-N
, alternating voltage V
ph-ph
, alternating current I
ph
,
alternating voltage across the neutral conductor V
N
, and frequency f are measured directly. All other
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
ph-N
: Va, Vb, Vc
•
Alternating voltage phase-phase (delta connection) V
ph-ph
: Vab, Vbc, Vca
•
Alternating voltage across the neutral conductor: V
N
•
Unbalanced voltage: U
2
•
Mean value of the 3 phase-ground voltages: V
avg
•
Alternating current I
P
(current through the conductor): Ia, Ib, Ic
•
Current in neutral conductor: I
N
•
Unbalanced current: I
unbal
•
Mean value of the 3 phase currents: I
avg
•
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
Summary of Contents for SENTRON PAC5100
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