MR TAPCON 250 - Parallel Operation

9 Operation
Maschinenfabrik Reinhausen GmbH 2022 1458595028/00 EN TAPCON
®
250
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%
1. Go to Settings > Parameters > On-load tap-changer regulator > Com-
pensation.
2. Select the desired parameter.
3. Set the desired parameter.
4. Press the Accept button to save the modified parameter.
Voltage increase
You can use this parameter to set the current-dependent voltage increase
∆U.
Voltage limit value
You can use this parameter to define the maximum permissible voltage in-
crease to avoid excess voltage on the transformer.
9.3.3 Parallel operation
Parallel transformer operation is used to increase the throughput capacity or
short-circuit capacity at one location. The device provides you with specific
functions for regulating transformers.
Conditions for parallel
operation
Compliance with the following general conditions is required for operating
transformers in parallel:
▪ Identical rated voltages
▪ Transformer power ratio (<3:1)
▪ Maximum deviation of short-circuit voltages (U
K
) for transformers con-
nected in parallel <10%