6 Commissioning
Maschinenfabrik Reinhausen GmbH 2020
124
4983703/01 EN
VACUTAP
®
VV-Ex
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.
6.3.4 Checking protective relay
ü
Check that the protective relay is functioning correctly before commission-
ing the transformer:
1. Ground the transformer on the high-voltage and low-voltage sides. Ensure
that the working ground connection on the transformer is not removed
during testing.
2. Ensure that transformer remains de-energized during testing.
3. Deactivate the automatic fire extinguishing device.
4. Open terminal box of protective relay.
5. Press OFF test button.
6. Leave the transformer's danger zone.
7. Ensure that the transformer's circuit breaker cannot be closed.
ð
Passive protection test
