MI 2893 / MI 2892 / MI 2885
Phase Diagram
66
Table 37: Instrument screen symbols and abbreviations
U0
I0
Zero sequence voltage component U
0
Zero sequence current component I
0
U+
I+
Positive sequence voltage component U
+
Positive sequence current component I
+
U-
I-
Negative sequence voltage component U
-
Negative sequence current component I
-
u-
i-
Negative sequence voltage ratio u
-
Negative sequence current ratio i
-
u0
i0
Zero sequence voltage ratio u
0
Zero sequence current ratio i
0
Table 38: Keys in Unbalance diagram screens
HOLD
Holds measurement on display. Hold clock time will be displayed in the
right top corner.
RUN
Runs held measurement.
U
I
I
U
Shows voltage unbalance measurement and selects voltage for scaling
(with cursors)
Shows current unbalance measurement and selects current for scaling
(with cursors)
METER
Switches to PHASE DIAGRAM view.
UNBAL.
Switches to UNBALANCE DIAGRAM view.
TREND
Switches to TREND view (available only during recording).
Scales voltage or current phasors.
Triggers Waveform snapshot.
Returns to the “MEASUREMENTS” submenu.
3.10.3
Unbalance trend
During active recording UNBALANCE TREND view is available (see section 3.14 for instructions how to
start GENERAL RECORDER).
Figure 48: Symmetry trend screen
F1
F2
F4
