Iskra WM3M4 - Selection of Available Quantities

MEASUREMENTS
User’s Manual WM3M4 &WM3M4C
27
5.2 Selection of available quantities
Microprocesor calculates the RMS voltage, RMS current, active, reactive and apparent power, U-I
phase angle, first harmonic of voltage, first harmonic of current, peak to peak voltage, THD of voltage
and THD of current. Complete selection of available online measuring quantities is shown in a table
below.
Meas. type
Measurement
Single-phase
3-phase
comments
Phase
Voltage
measurements
U
1-3_RMS


Current
I
1-3_RMS


Power
P
1-3_RMS


P
TOT_RMS


Q
1-3_RMS


Reactive power can be calculated as a squared difference
between S and P or as sample delayed
Q
TOT_RMS


S
1-3_RMS


S
TOT_RMS


PF
1-3_RMS


PF
TOT



1-3_RMS



TOT_RMS


Harmonic analysis
THD-U
1-3


THD-I
1-3


Phase to phase
Voltage
measurements
Upp
1-3_RMS



x-y_RMS


Phase-to-phase angle
Metering
Energy

Counter E
1


Other
Miscellaneous
measurements
Frequency

Temperature
Status
Checksum status

 Further description is available in following subchapters
Table 8: Selection of available measurement quantitie