6 Commissioning
Maschinenfabrik Reinhausen GmbH 2021
49
8209941/00 EN
ECOTAP
®
VPD
®
III 30D-24 / MD&C
6 Commissioning
6.1 Commissioning the on-load tap-changer at the transformer
manufacturer's site
WARNING
Flying parts and spraying of hot oil resulting from on-load tap-
changer overload!
The on-load tap-changer can switch currents of up to twice the rated
through-current. Higher currents occur when activating transformers (inrush
current impulse) or in the event of short-circuits, for example. Higher volt-
ages may occur due to transformer overexcitation following load shedding,
for example.
Danger of death or severe injury due to flying parts and spraying of hot oil!
► Ensure that the on-load tap-changer is not overloaded.
► Prevent on-load tap-change operations if higher currents arise.
► Ensure that the rated step voltage is not exceeded. The rated step volt-
age may be briefly exceeded by up to 10% as long as the rated through-
current is not exceeded.
► Ensure that the temperature limit values stated in the technical data are
not exceeded.
NOTICE
Damage to on-load tap-changer resulting from switching with-
out oil!
Performing too many operations without a complete transformer oil fill will
damage the on-load tap-changer!
► Do not perform more than 100 tap-change operations without a full oil fill.
► Only use emergency drive shaft to rectify faults and never operate with a
drill.
Checking the correct position of the on-load tap-changer and motor-
drive unit
DANGER
Danger of explosion!
An incorrect position of the on-load tap-changer or the motor drive shaft can
lead to malfunction and, consequently, to an overload of the on-load tap-
changer. This overload can lead to an explosion in the transformer.
► Carry out automatic adjustment and trial tap-change operations on a volt-
age-free transformer.
► Supply the controller and motor-drive unit via a separate voltage source
during these tests.
► If a separate voltage source is not available, it is imperative that the cor-
rect position of the on-load tap-changer and motor-drive unit be checked
again according to the section "Mounting the motor drive" before these
tests.
Summary of Contents for ECOTAP VPD 3 30D-24
Page 131: ......
