5 Commissioning
Maschinenfabrik Reinhausen 201448 2374092/04 ENTAPCON® 260
3. 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 posi-
tion of the on-load tap-changer by one setting.
ð The two devices must still be in a state of equilibrium.
4. Adjust the circulating reactive current sensitivity until the result dis-
played exceeds the set value for the bandwidth by approx. 0.2 % to
0.3 %.
ð The value for the result changes in the help text in the last line of
the display.
5. Set the value given in the previous step for all devices in parallel opera-
tion.
6. Press to select auto mode for both devices.
ð The devices return the on-load tap-changer units to the original tap
positions.
ð The function test for circulating reactive current sensitivity is complete.
If the earlier tap positions are not reached, increase the value of the circulat-
ing reactive current sensitivity [► 93] parameter.
If one of the two on-load tap-changer units switches one or more tap posi-
tions higher and the other switches the same amount lower, you need to re-
duce the value of the circulating reactive current sensitivity [► 93] parame-
ter.
After you have set the circulating reactive current sensitivity parameter,
continue with the circulating reactive current blocking function test described
in the next section.
Checking circulating reactive current blocking
This section describes how to run the function test for circulating reactive
current blocking.
1. Press on one device to select manual mode.
2. Using manual control, adjust the relevant motor-drive unit upwards by
the maximum permitted tap difference in operating positions between
the parallel operating transformers (for example by 1 - 2 steps).
When setting the circulating reactive current blocking in the following proc-
ess step, wait approx. 2 - 3 seconds between the individual steps.
3. Set the parallel operation method parameter to circulating reactive
current.
5.3.3.2
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