5 Mounting
Maschinenfabrik Reinhausen GmbH 2020
77
4983703/01 EN
VACUTAP
®
VV-Ex
When actuating the change-over selector, a higher torque is required.
1. Switch the on-load tap-changer into the desired operating position. The di-
verter switch operation can be heard distinctly.
2.
NOTICE!
An incomplete tap-change operation may damage the on-load
tap-changer. After operating the diverter switch, continue to crank the
drive shaft of the upper gear unit for 2.5 revolutions in the same direction
in order to correctly complete the tap-change operation.
3. Perform the transformer ratio test.
4. Repeat the transformer ratio test in all operating positions.
5. Switch the on-load tap-changer into adjustment position (see the accom-
panying connection diagram for the on-load tap-changer).
5.5 Fitting protective devices and drive components
5.5.1 Electrically connecting the temperature sensor
Size the cable for the electrical connection of the temperature sensors such
that you can turn the sensors if necessary when mounting the drive shaft.
► Electrically connect the temperature sensors in accordance with the con-
nection diagram provided.
5.5.2 Installing protective relay in piping and connecting
WARNING
Danger of explosion!
Explosive gases in the protective relay can deflagrate or explode and result
in severe injury or death.
► Wait 15 minutes after switching off the transformer before beginning fur-
ther work on the protective relay so that the gases can dissipate.
► Ensure that there are no ignition sources such as naked flames, hot sur-
faces or sparks (e.g. caused by the build-up of static charge) in the imme-
diate surroundings and that none occur.
► De-energize all auxiliary circuits before beginning work.
► Do not operate any electrical devices during the work (e.g. risk of sparks
from impact wrench).
Always perform all transformer tests with the protective relay attached and
connected.
