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7 Operation
Maschinenfabrik Reinhausen GmbH 2019
139
5163667/06 EN
ETOS
®
IM
Parameter
Auto
Master
Follower
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 43: Parameter
7.7.1.2 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 98: 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.
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