9 Visualization
Maschinenfabrik Reinhausen GmbH 2020
219
6385142/08 EN
ETOS
®
ED
The circulating reactive current is calculated from the transformer currents
and their phase angles. The voltage regulators in the parallel operation
group share this information via CAN bus. An extra control deviation propor-
tional to circulating reactive current is added to the independently regulating
voltage regulators as a correction for the control deviation determined on the
basis of the measurement voltage. You can use the circulating reactive cur-
rent sensitivity parameter to decrease or increase this extra control devia-
tion.
The circulating reactive current method is suited to transformers connected
in parallel with a similar nominal output and short-circuit voltage U
K
and to
vector groups with the same and different step voltages. This does not re-
quire any information about the tap position.
Note that the following prerequisites must be met for the "circulating reactive
current minimization" parallel operation method:
▪ You have to use current transformers with the same rated values for all
transformers in parallel operation.
▪ If you wish to operate in parallel operation with existing devices, you have
to activate the Retrofit TAPCON® 2xx [
rameter.
For the circulating reactive current minimization parallel operation method
with CAN communication, you have to set the following parameters:
▪ Activate parallel operation
▪ Parallel operation method: Circulating reactive current
▪ CAN bus address
▪ Circulating reactive current sensitivity
▪ Circul. reactive current blocking limit
▪ Error if no communication present
▪ Behavior if no communication present
▪ Parallel operation error delay time