8 Commissioning
Maschinenfabrik Reinhausen GmbH 2021
63
7817454/02 EN
TAPCON
®
230 Expert
8.2.3.1 Testing circulating reactive current minimization
Note that the following prerequisites must be met for the "circulating reactive
current minimization" parallel operation method:
▪ You must use current transformers with the same connection values for all
transformers in parallel operation.
▪ If you wish to operate in parallel operation with existing devices, you have
to activate the Retrofit TAPCON® 2xx parameter.
Consult the section Circulating reactive current minimization for more infor-
mation.
To set the circulating reactive current sensitivity, proceed as follows:
1. Select the "Circulating reactive current" parallel operation method.
2. Set circulating reactive current sensitivity to a value of 0%.
3. If necessary, activate the Retrofit TAPCON® 2xx function.
4. Adjust both transformers in independent mode to the same actual voltage
using the on-load tap-changers.
5. Connect the transformers in parallel and enable parallel control.
ð
The status display in the
Parallel operation
menu lights up blue.
ð
Both devices must be within the bandwidth.
6. Set the desired value of both voltage regulators to the voltage currently
measured.
7. On one of the two transformers, raise the tap position of the on-load tap-
changer by one setting; on the second transformer, lower the tap position
of the on-load tap-changer by one setting.
ð
Both devices remain within the bandwidth.
8. Increase the circulating reactive current sensitivity in small steps until the
control deviation dU in the main screen is outside the bandwidth (depend-
ing on the device, greater than or less than the bandwidth).
9. Press
to select auto mode on all devices.
ð
All devices return the on-load tap-changers to the original tap positions.
If an on-load tap-changer does not switch back to its original tap position,
you have to increase the circulating reactive current sensitivity.
If one of the on-load tap-changers switches one or more tap positions
higher and the other switches the same amount lower, you need to reduce
the circulating reactive current sensitivity.
After you have set the circulating reactive current sensitivity, continue with
the function test for the circulating reactive current blocking limit described in
the next section.
