9 Visualization
Maschinenfabrik Reinhausen GmbH 2020
185
4453918/14 EN
ETOS
®
TD
Parameter
Auto
Master
Follower
Activate parallel operation
Yes
Parallel operation method
Auto. tap syn-
chronization
Master
Follower
CAN bus address
Yes
Circul. reactive current
blocking limit
Optional, if master/follower current blocking is active
Master/follower current
blocking
Yes
Master/follower switching
characteristics
Yes
Maximum tap difference
Yes (if follower)
No
Yes
Error if no communication
present
Yes
Behavior if no communi-
cation present
Yes
Parallel operation error
delay time
Yes
Table 63: Parameter
9.21.1.2 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
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