MR TAPCON, Руководство по эксплуатации

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8 Operation
Maschinenfabrik Reinhausen GmbH 2020 182 3587317/21 EN TAPCON
®
8.18.1.2 Circulating reactive current minimization with CAN bus communication
With the circulating reactive current parallel operation method, parallel op-
eration is carried out using the circulating reactive current minimization
method.
U, I, cosφ
CAN bus
M AVR M AVR
T1 T2
Figure 125: Circulating reactive current minimization with CAN bus communication
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 [ ► Section 8.18.3, Page 193] pa-
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