MR ECOTAP VPD CONTROL PRO, Руководство по эксплуатации

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8 Operation
Maschinenfabrik Reinhausen GmbH 2018 99 5252433/02 EN ECOTAP
®
VPD
®
CONTROL PRO
Parameter Auto Master Follower
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 32: Parameter
8.9.1.2 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 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
K
and to
vector groups with the same and different step voltages. This does not re-
quire any information about the tap position.