Amprobe DMIII-Multitest Power-Quality-Recorder - Manual (Page 59)

AMPROBE
DMIII MULTITEST
EN-57
7.6. "POWER" FUNCTION
This function permits to display in real time the RMS value of AC/DC voltage, the peak and
ThdV value of the 3 phase voltages, the waveform of the 3 phase voltages, the RMS value
of AC/DC currents, the peak and Thdl of the 3 phase currents and the waveform of the 3
phase currents. Furthermore, the instrument calculates and displays the value of phase
and total active powers, the value of phase and total reactive and capacitive powers, the
value of phase and total power factors and cos

.
7.6.1. Symbols
The position POWER has two working modes:
 METER
 WAVE
For voltage and current harmonics see paragraphs 7.4.3 and 7.5.3 respectively.
These modes will be described in detail in the next paragraphs.
The symbols used are described below:
Symbol Description
V1, V2, V3 RMS value of voltage (phase 1, phase 2, phase 3 respectively)
V12, V23, V32, V31 RMS value of phase to phase voltages
freq Network frequency
Phseq Phase sequence indicator
"123"

correct
"132"

inverted
"023"

null voltage on black wire
"103"

null voltage on red wire
"120"

null voltage on blue wire
"100"

null voltages on red and blue wires
"020"

null voltages on black and blue wires
"003"

null voltages on black and red wires
I1, I2, I3 RMS value of current (phase 1, phase 2, phase 3 respectively)
IN RMS value of current of neutral
Pt, P1, P2, P3 Values of active power (total, phase 1, phase 2, phase 3 respectively)
P12, P32 (only for 3-wire measurement) value of power measured by Wattmeter 1-2 and 3-2
respectively
Qt, Q1, Q2, Q3 Values of reactive power (total, phase 1, phase 2, phase 3 respectively)
Q12, Q32 (only for 3-wire measurement) Value of power measured by VAR meter Va1-2 and
3-2 respectively
St, S1, S2, S3 Values of apparent power (total, phase 1, phase 2, phase 3 respectively)
S12, S32 (only for 3-wire measurement) Value of power measured by VA meter Va1-2 and 3-
2 respectively
Pft, pf1, pf2, pf3 Values of power factors (total, phase 1, phase 2, phase 3 respectively)
dPft, dpf1, dpf2, dpf3 Value of the cos

(total, phase 1, phase 2, phase 3 respectively)
Ead, Pd Values of total active energy and active power on demand respectively
Esd, Sd Values of total apparent energy and apparent power on demand respectively
Tab. 3: Symbols used in the POWER function
The symbols "i" and "c" stand for reactive powers (Q), power factors (Pf) and cos

(dpf),
inductive and capacitive respectively.