MR ECOTAP VPD CONTROL PRO Operating Instructions Manual page 99

8 Operation
8.9.1.2 Circulating reactive current minimization with CAN bus communication
Maschinenfabrik Reinhausen GmbH 2018
Parameter
Master/follower switching
characteristics
Maximum tap difference
Error if no communication
present
Behavior if no communi-
cation present
Parallel operation error
delay time
Table 32: Parameter
With the circulating reactive current parallel operation method, parallel op-
eration is carried out using the circulating reactive current minimization
method.
T1
M
Figure 66: 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
vector groups with the same and different step voltages. This does not re-
quire any information about the tap position.
5252433/02 EN
Auto
Yes (if follower)
AVR
U, I, cosφ
CAN bus
ECOTAP
Master Follower
Yes
No Yes
Yes
Yes
Yes
T2
AVR M
and to
K
® ®
VPD CONTROL PRO 99