MR tapcon 240, Operating Instructions Manual

Page: 106 / 174

7 Functions and settings
Maschinenfabrik Reinhausen 2014 106 222/08 EN TAPCON® 240
You must select the same parallel operation method for all voltage regula-
tors operating in parallel.
The following sections describe how you can set the parameters for a paral-
lel operation method.
Setting circulating reactive current method
When the circulating reactive current parallel operation method is select-
ed, then parallel operation is carried out using the circulating reactive current
minimization method. The circulating reactive current is calculated from the
transformer currents and their phase angles. A voltage proportional to the
circulating reactive current is added to the independently operating voltage
regulators as a correction for the measurement voltage. This voltage correc-
tion can be reduced or increased using the circulating reactive current sensi-
tivity setting.
The circulating reactive current method is suited to transformers connected
in parallel with a similar nominal output and short-circuit voltage V
K
and to
vector groups with the same and different step voltages. This does not re-
quire any information about the tap position.
To set the circulating reactive current parallel operation method, proceed
as follows:
1. > Configuration > Parallel operation.
ð Parallel operation method.
2. Press or until circulating reactive current appears in the dis-
play.
3. Press .
ð The parallel operation method is set.
When using the circulating reactive current parallel operation method, you
have to set the parameters for the circulating reactive current sensitivity
and circulating reactive current blocking .
Setting circulating reactive current sensitivity
The circulating reactive current sensitivity is a measure of its effect on the
behavior of the voltage regulator. At a setting of 0 % no effect is present.
With circulating reactive current relating to the rated current of the current
transformer, if you set the value to 10 % for example, this would cause the
voltage in the voltage regulator to be corrected by 10 %. This correction to
the voltage can be increased or decreased with this setting to attain the opti-
mum value.
As soon as you change the circulating reactive current sensitivity value, the
value for the result changes in the help text in the display.
7.9.2.1