ABB BUE, Руководство по ремонту

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Recommended practices
ABB recommends careful consideration of the following factors for service and repair work
on on-load tap-changers.
Do not repair an on-load tap-changer or motor-drive mechanism with a serious mechanical
or electrical fault without first consulting ABB.
Before you start any work, make sure that the personnel doing the job have read and fully
understood the Repair documents provided with the unit.
To avoid damaging the unit, never exceed the operating limits stated in delivery documents
and on rating plates.
Do not alter or modify a unit without first consulting ABB.
Follow local and international wiring regulations at all times.
Use only factory authorized replacement parts and procedures.
WARNING, CAUTION and NOTE
WARNING
A WARNING provides information which, if disregarded, could cause injury or death.
CAUTION
A CAUTION provides information which, if disregarded, could cause damage to the equip-
ment.
NOTE: A NOTE provides additional information to assist in carrying out the work de-
scribed.
Safety precautions
WARNING
Before any work is carried out on the on-load tap-changer:Make sure that the trans-
former is disconnected and that earthing is properly carried out. Obtain a signed
certificate from the engineer in charge.
The relevant technical documents should be read and understood before any work is
started, and the procedures in this document should be followed at all times.
Before carrying out work on the on-load tap-changer, put the LOCAL/REMOTE switch
in the motor-drive mechanism to position 0. It is also recommended to shut the door
of the motor-drive mechanism and pad lock it when work is carried out on the on-load
tap-changer. The key should be kept by the operator. This is done to avoid unexpect-
ed start of the motor-drive mechanism.
Before starting any work inside the motor-drive mechanism, the auxiliary power must
be switched off.
N.B. The motor, contactors and heating element may be energized from separate
sources.
Be aware of the risk for slipperiness caused by oil spillage for instance when working
on the transformer cover.