8 Commissioning
Maschinenfabrik Reinhausen GmbH 2022 818595028/00 EN TAPCON
®
250
If one TAPCON® or all of the TAPCON® units indicate Circulating reactive
current blocking limit exceeded even though the control inputs are correctly
connected for all TAPCON® units, all of the TAPCON® units block.
This could be due to various causes. Further information is given in the
chapter Troubleshooting [►Section 11, Page 173].
ð The function test for the circulating reactive current blocking limit is com-
plete.
8.3.3.3 Checking tap synchronization method
NOTICE
Damage resulting from formation of a circulating reactive cur-
rent
If the parameters are not set correctly, damage may result from the forma-
tion of circulating reactive current and the resulting overload of transmission
lines and transformers.
► Check the transformer nameplate.
► Set device parameters in accordance with the transformer configuration.
In parallel operation in accordance with the Automatic tap synchroniza-
tion method, the tap positions of the transformers running in parallel are
compared. It is therefore necessary that the transformers have the same
position designation and that the Raise and Lower signals produce the
same voltage change in all transformers.
Before starting the function test, you must carry out the following steps:
1. Assign the master function to one device.
2. Assign the follower function to the other devices.
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