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11. Transformer transportation and put into operation on site
11.1 Remove the MDU for transportation
1) Place the MDU at the calibration position and then remove the coupling
2) Remove the MDU
3) Do not operate the MDU when the tap-changer is not connected well. The re-assembly of the MDU
and drive shaft must be carried out according to Chapter 9.3 to 9.7 of this instruction manual.
11.2 Oil filling and transportation without oil conservator
If the transformer is filled with oil during storage and transportation but no oil conservator is installed, a
bypass pipe must be installed between the inside of the diverter switch oil chamber and the transformer
oil tank to balance the pressure generated by oil expansion. The bypass tube is installed between the pipe
connector E2 and Q.
11.3 Transportation without oil
If the transformer is transported or stored without oil filling, all the oil in the tap-changer oil compartment
must be discharged. The protection method for tap-changer oil compartment should be same as that for
the transformer, such as nitrogen filling.
11.4 Putting transformer into operation on site
Before putting the transformer into operation, make sure the tap selector is completely immersed in the
transformer oil and the oil compartment is filled with oil.
1) Fill OLTC with oil according to Chapter 8.2 (Refer to Chapter 13.1 Table 13-2 for the limit of oil
quality).
There is explosive gas under the tap-changer cover, in the connection
system, oil conservator and the outlet of air dryer. The flying parts and
the high temperature oil splashing to the outside will cause fatal and
serious injury.
For the storage period of 3 to 4 weeks without oil conservator, the oil level of the tap
changer should be lowered by about 5 liters.
For long-term storage, the heater of the MDU should be regularly energized to prevent
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