H 16.3.2) – Amprobe DM-111S Current-Data-Logger User Manual
Page 59
DMIIIS
EN - 57
and where:
Value
Significance
P
The active power (positive or negative) is defined in the panel and therefore acquires the value
of the active power in that moment.
Q
The reactive power (inductive or capacitive, positive or negative) is defined in the panel and
therefore acquires the value of the reactive power in that moment.
Pf
The power factor (inductive or capacitive, positive or negative) is defined in the panel and
therefore acquires the value of the power factor in that moment.
0
The active power (positive or negative) or the reactive power (inductive or capacitive, positive
or negative) is NOT defined in the panel and therefore acquires a null value.
-1
The power factor (inductive or capacitive, positive or negative) is NOT defined in the panel.
16.3.2. 3 phase 3 wire system
In the electrical systems distributed without neutral, the phase voltages and the power
factors and phase cos
lose importance. Only the phase to phase voltages, the phase
currents and the total powers remain defined.
Phase 1
Phase 2
Phase 3
W 1-2
VAR 1-2
W 3-2
VAR 3-2
Three-phase
equipment
In this case the potential of one of the three phases (for example, phase 2) is taken on as
reference potential. The total values of the active, reactive and apparent power are
expressed as sum of the indications of the couples of Wattmeters, VARmeters and
VAmeters.
2
2
3
2
1
2
2
3
2
1
2
3
2
1
2
3
2
1
VAR
VAR
W
W
S
VAR
VAR
Q
W
W
P
TOT
TOT
TOT