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5.3.5
Current Expert Mode
For a single-phase connection, this mode displays the Current expert mode.
1
ITEM
FUNCTION
1.
This information concerns the following elements:
-: "negative" sequence.
0: "zero" sequence.
+: "positive" sequence.
%: Sums of the levels of "voltage" harmonics classified by sequence ("negative" to
the left, "zero" in the centre, and "positive" to the right). See NOTE.
2.
Sequences of current harmonics*
*Not available with a balanced three-phase connection.
NOTE: The effects of the sequences are the following:
"Negative" sequence
•
Overheating of rotating machine.
•
Loss of torque.
•
Mechanical oscillations.
•
Higher current draw for a given load.
•
Premature ageing of rotating machine.
"Zero" sequence
•
Overheating of rotating machine.
•
Higher current draw for a given load.
•
Overload of the neutral.
•
Premature ageing of rotating machine.
38
49.99Hz
Ah
02
05
08
11
14
17
20
23
0.5
%
V
A
Figure 5-14
02/25/06
0
03
06
09
12
15
18
21
24
0.4
%
VA
V -,+
A -,+
2
Power Quality Analyzer Model 8230
10:26
04
07
10
13
16
19
22
25
0.4
%
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