MR TAPCON - Parallel Operation Methods

8 Operation
Maschinenfabrik Reinhausen GmbH 2020180 3587317/21 ENTAPCON
®
Conditions for parallel
operation
Compliance with the following general conditions is required for operating
transformers in parallel:
▪ Identical rated voltages
▪ Transformer power ratio (<3:1)
▪ Maximum deviation of short-circuit voltages (U
K
) for transformers con-
nected in parallel <10%
▪ Same number of switching groups
▪ For parallel operation with CAN communication: Current transformers with
the same rated values must be used for all devices operating in parallel
8.18.1 Parallel operation methods
You can undertake parallel operation with various parallel operation meth-
ods.
8.18.1.1 Tap synchronization
With the tap synchronization parallel operation method, one voltage regu-
lator works as the master and all others as followers.
Master Follower
Tap position
CAN bus
M AVR MAVR
T1 T2
Figure124: Tap synchronization
The master handles voltage regulation and transmits its current tap positions
to all followers via the CAN bus. The followers compare the tap position re-
ceived with their own tap position. If the tap position is not the same, the fol-
lowers switch to the tap position received from the master. This ensures that
the transformers operating in parallel are always in the same tap position.
You can set whether the master transfers the change in tap position to the
followers before or after its own tap-change operation. The devices then ei-
ther change position sequentially (first the master, then the followers) or in
synch (master and followers at the same time).