Recommended practices
ABB recommends careful consideration of the following factors when installing on-load tap-
changers:
Before you install or commission a unit, make sure that the personnel doing the job have
read and fully understood the Installation and Commissioning Guide 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
Unused transformer oil is slightly harmful. Fumes from unused warm oil may irritate
the respiratory organs and the eyes. After long and repeated contact with transformer
oil skin becomes very dry.
Used on-load tap-changer oil from diverter switch housings and selector switch
housings contains harmful substances. Fumes are irritating to the respiratory organs
and the eyes and are very easily set on fire. Used transformer oil may well be carcino
-
genic.
Avoid contact with the oil as much as possible and use oiltight protective gloves
when handling the oil.
First aid:
Skin contact: Wash the hands. Use skin cream to counteract drying.
In the eyes: Rinse the eyes in clean water.
Swallowing: Drink water or milk. Avoid vomiting. Call a doctor.
Collect used oil in oil drums.
Waste and cleaning up: Should be absorbed by an absorber. Treat it as hazardous to
the environment.
At fire: The fire is extinguished by using powder, foam or carbon acid.