MR tapcon 240 - Checking circulating reactive current blocking

6 Commissioning
Maschinenfabrik Reinhausen 201450 222/08 ENTAPCON® 240
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 [► 106] 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 [► 106] 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.
4. The circulating reactive current blocking parameter should be re-
duced [► 107] from the set value of 20 % in steps of 1 % until the Par-
allel operation error: circulating reactive current limit exceeded is dis-
played.
ð The Parallel operation LED lights up when the circulating reactive
current blocking limit is reached.
ð Any further regulation is blocked.
5. After the set delay time for the parallel operation error message (time
can be adjusted [► 109]), the signaling relay UC-X1:1/UC-X1:2 (default
setting) is activated.
6. Increase the circulating reactive current blocking parameter again
until the message Parallel operation error: circulating reactive current
limit exceeded disappears.
6.3.3.2