Sonel MPI-540 - Page 113

MPI-540 – USER MANUAL
111
 total harmonic distortion (THD) THD
F
for currents and voltages,
 active, reactive, apparent and distortion power,
 active positive and negative energies,
 passive energies consumed and returned,
 apparent energies,
 power factors (PF)
 unbalance factors of voltages and currents
Some of the parameters are aggregated (averaged) according to the time selected by the user (avail-
able settings: 1 s, 3 s, 10 s, 30 s, 1 min, 10 min, 15 min, 30 min) and may be stored on a memory
card.
The meter is compatible with PC software Sonel Analysis, which also supports other analyzers pro-
duced by Sonel. This software allows analysis of the recorded data. The data may be read using the
USB cable or directly from a microSD card after inserting it to an external memory card reader con-
nected to PC.
Tab. 4.1 presents a summary of parameters measured by PQM-707, depending on the mains type.
Tab. 4.1. Measured parameters for different network configurations
Network type,
channel
Parameter
1-phase
2-phase
3-phase
4-wire
3-phase
3-wire
L1
N
L1
L2
N
Σ
L1
L2
L3
N
Σ
L12
L23
L31
Σ
U
Effective voltage









U
DC
Voltage constant component









I
Effective current











I
DC
Current constant component












F
Frequency




P
Active power









Q
1
Reactive power









(1)
D, S
N
Distortion power








S
Apparent power









PF
Power Factor









THD
F
U
Total harmonic distortion voltage









THD
F
I
Total harmonic distortion current












E
P+
, E
P-
Active energy (consumed and sup-
plied)









E
Q1+
, E
Q1-
Reactive energy (consumed and
supplied)









(1)
E
S
Apparent energy









U
h1
..U
h40
Voltage harmonic amplitudes









I
h1
..I
h40
Current harmonic amplitudes












Unbalance U, I
Symmetrical components and un-
balance factors


Explanations: L1, L2, L3 (L12, L23, L31) indicate subsequent phases,
N is a measurement of I
N
current depending on the parameter type,
Σ is the total value for the system.
(1) In 3-wire networks, the total reactive power is calculated as inactive power N.
(2) Only consumed energy E
P+