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5.2.3
Power and Direction Flow Analysis
59.98Hz
VAh03
%
100
0
-100
V
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.
By convention, positive harmonics are from supply to load, and negative har-
monics 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
lighted by the cursor. This harmonic is generated by the load.
Harmonic direction is influenced by probe installation on the proper phase
and arrow on probe facing the load.
48
-63
%
min - 22 %
1
3
5
7
9 11 13 15 17 19 21 23 25
A
VA
07/25/02
- 122 °
max - 22 %
W
VA
U
Figure 5-10
Power Quality Analyzer Model 3945-B
10:26
100%
G
.+
3L
L1
L2
L3
harmonic high-
rd
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