40
Power Quality Analyzer Model 3945
5.2.3 Power and Direction Flow Analysis
07/25/02
59.98Hz
10:26
100%
.+
3L
L1
L2
L3
- 63
%
G
VAh03
min - 22 %
- 122 °
max - 22 %
V
A
VA
U
100
-100
%
0
1
3
5
7
9 11 13 15 17 19 21 23 25
Figure 5-10
Harmonics on this screen are shown with either a positive or negative orientation.
Since the bar selected in this example is negative, it indicates that it is a harmonic
from load to source.
NOTE: By convention, positive harmonics are from supply to load, and nega-
tive harmonics are from load to supply.
The signs are only available in harmonic power measurement.
The example above shows a power harmonic display with the 3
rd
harmonic high-
lighted by the cursor. This harmonic is generated by the load.
