Hioki 3169-20 - Appendix

195
1
2
APP
4
5
6
7
8
9
10
11
APPX
APP
Power Measurement by the 2 Power-Meter
Method and U3/I3 Measurement Theory
(3P3W2M mode)
The figure above shows an artificial circuit of a three-phase 3-wire
line. In the figure,
and represent the vectors of line to
line voltage;
and represent the line (phase) current vec-
tors;
and represent the phase to neutral voltage vectors.
Normally, three-phase power P is obtained as the sum of the power
of the phases.
(1)
Appendix
Neutral point
Three-phase 3-wire
Power-supply side
Three-phase
3-wire Load
side
1
2
3
→
I
3
I
2
→
→
I
1
U
1
U
3
U
2
u
1
u
2
u
3
U
1
, U
2
,
U
3
I
1
, I
2
, I
3
u
1
, u
2
, u
3
Pu
·
1
I
·
1
u
·
2
I
·
2
u
·
3
I
·
3
++=