MR TAPCON - Page 175

8 Operation
Maschinenfabrik Reinhausen GmbH 2020 1753587317/21 EN TAPCON
®
8.16.2 Z compensation
To keep the voltage constant for the consumer, you can use Z compensation
to activate a current-dependent voltage increase. You can also define a limit
value to avoid excess voltage on the transformer.
ΔU% max
ΔU%
ΔU%
I
Figure120: Z compensation
To use Z compensation, you need to calculate the voltage increase (ΔU) tak-
ing the current into account. Use the following formula for this purpose:
ΔU =
U
Tr
- U
Load
U
Load
×
I
N
×k
CT
I
×100%
∆U Voltage increase I Load current in A
U
Tr
Transformer voltage at current I I
N
Nominal current of current-trans-
former connection in A
U
Load
Voltage on line end at current I
and on-load tap-changer in
same operating position
k
CT
Current transformer transmission
ratio
Sample calculation: U
Tr
= 100.1V, U
Load
= 100.0V, I
N
= 5A k
CT
= 200A/5A,
I = 100A
Produces a voltage increase ∆U of 0.2%