MR VACUTAP, Operating Instructions Manual

Page: 33 / 96

4 Commissioning
Maschinenfabrik Reinhausen GmbH 2020 33 5788897/03 EN VACUTAP
®
VVS
®
4.1.3 Checking motor-drive unit
NOTICE Damage to the on-load tap-changer / de-energized tap-changer!
Damage to the on-load tap-changer / de-energized tap-changer due to actu-
ation of the on-load tap-changer / de-energized tap-changer without insulat-
ing fluid.
► Ensure that the selector / de-energized tap changer is fully immersed in
insulating fluid and that the oil compartment of the on-load tap-changer is
completely filled with insulating fluid.
NOTICE Damage to the on-load tap-changer and motor-drive unit!
Damage to on-load tap-changer and motor-drive unit due to incorrect use of
position transmitter equipment.
► Only circuits stated in the chapter Technical data for position transmitter
equipment may be connected to the position transmitter module connec-
tions.
► The switchover point of the position transmitter equipment in the motor-
drive unit is not the same as the switchover point of the diverter switch
operation. This depends on the type of diverter switch. This fact should
be noted when project planning the locking circuits between the motor-
drive unit and external equipment (e.g. transformer circuit breaker).
► Therefore, the "Tap changer in operation" position transit contact shown
in the connection diagram should be used for external monitoring, locking
and control purposes instead of the position transmitter equipment.
Prior to commissioning the transformer, check whether the motor-drive unit
and on-load tap-changer are correctly coupled and that the motor-drive unit
functions correctly.
Tests on the motor-drive unit
1. Perform function checks as described in relevant MR operating instruc-
tions for motor-drive unit.
2. NOTICE! An incorrectly coupled motor-drive unit will lead to damage to
the on-load tap-changer. Undertake trial tap-change operations across the
entire range of settings. Ensure that in each operating position, the tap po-
sition indicators of motor-drive unit and on-load tap-changer (inspection
window in the on-load tap-changer head) match.
Dielectric tests on transformer wiring
► Note information relating to dielectric tests on transformer wiring in rele-
vant MR operating instructions for motor-drive unit.