6 Commissioning
Maschinenfabrik Reinhausen GmbH 2020
125
4983703/01 EN
VACUTAP
®
VV-Ex
8. Press IN SERVICE test button.
9. Leave the transformer's danger zone.
10. Close the transformer's circuit breaker with isolating switches open and
the transformer grounded on all sides.
11. Press OFF test button.
12. Ensure that the transformer's circuit breaker is open.
ð
Active protection test.
13. Press IN SERVICE test button to reset the protective relay.
6.3.5 Commissioning the transformer
ü
The signaling contact for falling below the minimum insulating fluid fill level
in the on-load tap-changer's oil conservator is looped into the tripping cir-
cuit of the circuit breaker.
ü
The protective relay and additional protective devices are looped into the
circuit breaker's tripping circuit.
ü
The motor-drive unit and all protective devices are functioning correctly
and are ready for use.
ü
The oil compartment of the on-load tap-changer is completely filled with
insulation fluid.
ü
All stop-cocks between on-load tap-changer and oil conservator of the on-
load tap-changer are open.
1. Switch on transformer.
2.
NOTICE!
Inrush current impulses can be significantly greater than the
transformer rated current and may lead to current paths with asymmetrical
or non-sinusoidal curve shapes and, as a result, overload the on-load tap-
changer during the diverter switch operation. Only perform tap-change op-
erations - whether under no load or under load conditions - once the in-
rush current impulse has subsided.
