MR TAPCON 260 - Z Compensation for Voltage Stability; Calculating Voltage Increase for Z Compensation

6 Functions and settings
Maschinenfabrik Reinhausen 201478 2374092/04 ENTAPCON® 260
4. Press .
ð The inductive voltage drop Vx is set.
Z compensation
To keep the voltage constant for the consumer, you can use Z compensation
to activate a current-dependent increase in voltage. You can also define a
limit value to avoid excess voltage on the transformer.
Figure 49: Z compensation
To use Z compensation, you need to calculate the increase in voltage (ΔU)
taking the current into account. Use the following formula for this purpose:
∆U Voltage increase I Load current in A
U
Tr
Transformer voltage with
current I
I
N
Nominal current of current-
transformer connection in A
(0.2 A; 1 A; 5 A )
U
Load
Voltage on line end with
current I and on-load tap-
changer in same operating
position
k
CT
Current transformer 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%
The following sections describe how you can set the parameters you need
for Z compensation.
6.7.2