In order to prevent the leakage or fire of transformer oil, the large transformer should empty the oil tank and be transported in oil-free state. But the transportation transformer which does not carry the oil, very easy to have the insulation to be affected by the moisture.

Therefore,traditional oil-free transportation requires filling the transformer tank with nitrogen or other inertgases to reduce the possibility of moisture in the insulation. The experience shows that as long  as the tank has good sealing, the nitrogen pressure in the tank is kept at 0.035 MPA (the dew point is less than-40 °c) , the gas is kept dry, and the transportation time is shortened as far as possible (the longest is not more than 3 ~ 4 months) There would be no dampening of the insulation.

However, nitrogen-filled transportation is not only more costly, but also, after nitrogen is removed from the site, personnel entering the tank to check if the oxygen content is less than  18% can cause personal accidents due to the lack of oxygen, and more importantly, nitrogen replacement in the field of transformer installation is tedious and inefficient.

  In order to change this situation, instead of nitrogen-filled transport, the high-pressure air source is connected to  the dry air generator, and the air is dried and purified by the dry air generator To make the dew  point of dry air below-40 °c, the gas purification precision ≤10 m, to fill the transformer without oil  transportation, to solve the problem of nitrogen replacement, this not only simplifies the process, the utility model can also greatly reduce the transportation cost of the over-weight transformer

and avoid the possibility of the occurrence of the on-site anoxic accident. 

·Service conditions

1. The maximum ambient air temperature shall not exceed 40 ℃, and the minimum shall not below - 25 ℃;

2. The altitude shall not exceed 1000m. If special customized transformers and low-voltage components are used, the altitude can reach 4000m;

3. The vertical inclination is no more than 5°, and no violent vibration and impact;

4. The air humidity is not more than 90% (+ 25 ℃);

5. No gas and conductive dust that will seriously affect the insulation of transformer, no explosion hazard and corrosion of electrical components;

6. Outdoor wind speed shall not exceed 35m / s.

7.If service conditions beyond the above, specially customized product is available.