7 Functions and settings
86
TAPCON® 230 basic
2117246/02 EN
© Maschinenfabrik Reinhausen 2012
7.3.7.2 Determining
bandwidth
In order to be able to set the value correctly, the transformer's step voltage
and nominal voltage must be known.
The following value is recommended for the bandwidth "B %":
[±B % ]
0.6
U
n-1
U
n
100 %
U
nominal
V
n-1
Step voltage of position n-1
V
n
Step voltage of position n
V
Nominal
Nominal voltage
The bandwidth must be selected in such a way that the output voltage of
the transformer (V
actual
) returns to within the specified tolerance range after
the tap change.
If too small a bandwidth is defined, the output voltage exceeds the band-
width selected and the device must immediately issue a tap-change com-
mand in the opposite direction.
If a very large bandwidth is selected, this results in a major control devia-
tion.
Sample calculation
The following transformer parameters are used by way of example for deter-
mining the recommended bandwidth:
Nominal voltage:
V
Nominal
= 11000 V
Step voltage of position 4:
V
Step4
= 11275 V
Step voltage of position 5:
V
Step5
= 11000 V
