5 Mounting
Maschinenfabrik Reinhausen GmbH 2019
44
6107891/02 EN
ECOTAP
®
VPD
®
You have to mount and remove the motor-drive unit and control unit several
times:
1. After installing the on-load tap-changer, mount the motor-drive unit and
control unit and start them up, including automatic adjustment and trial
tap-change operations.
This first partial commissioning process is needed for you to be able to
check the wiring between the on-load tap-changer and transformer in ac-
cordance with the following description in the "Taking measure-
ments" [
Section 5.4, Page 44] section.
2. Before "Drying the on-load tap-changer" [
move the motor-drive unit and control unit again to avoid damage.
3. Drying and filling with oil [
Section 5.6, Page 48] is followed by the step
"Commissioning the on-load tap-changer at the transformer manufac-
turer's site" [
Section 6.1, Page 49]. This involves mounting the motor-
drive unit and control unit for a second time.
4. Before performing the "dielectric tests on the transformer wiring [
6.1.1.2, Page 51]", disconnect the connection cable to the motor-drive
unit on the control unit to avoid damage.
5. Before "Commissioning the transformer at the operating site" [
6.3, Page 54], reconnect and commission the control unit.
You will find the description of how to mount, commission, and test the mo-
tor-drive unit and control unit in the operating instructions for the
ECOTAP® VPD® MD&C motor-drive unit.
5.4 Taking measurements
WARNING
Electric shock from incorrect operation!
Danger of death or severe injury from electric shock!
► Only take measurements when the transformer is de-energized.
► Only perform tap-change operation with the control unit.
► Tap-change operations initiated by actuation with the emergency drive
shaft are not permitted during this test.
NOTICE
Damage to on-load tap-changer and motor-drive unit!
Damage to on-load tap-changer and transformer due to improper trans-
former ratio test!
► Do not perform more than 100 tap-change operations without a full oil fill.
► Only switch on-load tap-changer with the help of the control unit.
► Only use emergency drive shaft to rectify faults [
and never operate with a drill.
Before drying the transformer, undertake the transformer ratio test and DC
resistance measurement as described below.