Oil Level During Transport; Transformer Filled With Oil; Conservator Mounted; Conservator Dismounted - ABB UCC Series Installation And Commissioning Manual

On-load tap-changers with motor-drive mechanism type bue

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8.2 Oil Level During Transport

The following adjustments of the oil level should be carried out when the on-load tap-

changer should be transported.

The transformer is transported filled with oil. When the transformer is transported filled

with oil the on-load tap-changer should also be transported filled with oil.

The diverter switch housing should be filled to normal operating level and the valve to

the conservator should be open.

The oil level of the diverter switch housing should be lowered to 150 mm below the

upper edge of the housing.

When the conservator is removed, take off the cover of the diverter switch housing and

drain oil with a pump to 150 mm below the upper edge of the housing. Remount the

cover. Turn the cover so the guiding pin in the housing is facing the guiding hole in the

cover. Make sure the gasket is properly in place. Seal all flange connections by

mounting gaskets and covers. Shut all valves.

The transformer is transported without oil. When the transformer is transported without

oil the on-load tap-changer should also be transported without oil.

CAUTION

8 Transport

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Ucd series