9 Visualization
Maschinenfabrik Reinhausen GmbH 2020
225
4453918/14 EN
ETOS
®
TD
The top diagram shows how often the on-load tap-changer was switched
into a particular tap position and how long it spent there. The bottom dia-
gram shows the time spent in the tap positions over the last 10 days.
Figure 160: Tap-change operation statistics
► Go to
Information > On-load tap-changer > Tap-change operation sta-
tistics
.
9.25.4 Motor Current Index (MCI)
The term Motor Current Index (in accordance with IEEE PC57.143) de-
scribes the area below the curve of the motor current during an on-load tap-
change operation. The Motor Current Index is a measurement that takes into
account the inrush current, the present tap-change conditions and the tap-
change duration.
3
6
9
12
15
A
0
0
1
2
3
4
s
I
t
200
400
600
800
1000
0
Tap-change operations
MCI
Motor current
Motor Current Index
Figure 161: Example illustration of the temporal progression of the motor current
I
and of the
Motor Current Index
MCI
calculated from this in comparison with the values of the
MCI
for fur-
ther on-load tap-change operations
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