After oil lling
CAUTION
Do not energize the transformer earlier than three hours after oil lling in atmospheric pres-
sure. This waiting period is needed to allow airbubbles to disappear.
During service
WARNING
Small amounts of explosive gases will always come out from the breathing devices
(dehydrating breather or one-way breather). Make sure that no open re, hot surfaces
or sparks occur in the immediate surrounding of the breathing devices.
If a failure in power supply occurs during operation, the operation will be completed
when the power returns.
The hand crank must not be inserted during electrical operation.
If the on-load tap-changer is not in its exact position and the hand crank is pulled out,
the motor-drive mechanism will start and go to the exact position if the power supply
is on.
CAUTION
After a pressure relay trip, follow the instructions in the chapter ”Pressure Relay” in the Re-
pair Guide.
The pressure relay is a calibrated monitoring instrument. It must be handled with care and
protected against careless handling or any kind of mechanical damage.
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