Why is it necessary to fill nitrogen and dismantle components such as casings during transportation?   And why is it required to remove the oil storage tank and safety duct during vacuum oil injection?

When the transport weight of a large transformer exceeds the carrying capacity of the transport vehicle, it is necessary to release the oil for transportation. However, once the oil is released, the core and winding inside the oil tank come into contact with the air. Although the air contains 75% nitrogen, the nitrogen in the air contains moisture. Contact with the surface of the core can lead to rusting, and contact with the winding can cause moisture absorption, reducing insulation strength. Therefore, after releasing the oil, it is common practice to fill the tank with dry nitrogen to overcome the issues of rusting and decreased insulation strength.

After transporting the nitrogen-filled transformer to the construction site, the pressure of the nitrogen should be checked to ensure an adequate amount is present in the tank. Subsequently, the nitrogen must be released, and the transformer should be immediately filled with approved transformer oil. Safety precautions must be observed during nitrogen release, as inhaling nitrogen poses a life-threatening risk. It is prohibited to enter the tank for inspection until the nitrogen is completely released to avoid danger.

While filling nitrogen can reduce transportation weight, it only addresses the loading issue of the transport vehicle. Additionally, it is necessary to ensure that the transport dimensions are smaller than the restrictions imposed by tunnels, bridges, and other structures. To meet the size requirements for transportation, components such as casings of large transformers need to be dismantled, as detailed in the railway transport standard limits shown in Figure 89-1.

During vacuum oil injection, the mechanical strength of the oil storage tank and the safety duct is insufficient to meet the vacuum requirements. Failure to remove them may result in damaging the glass film of the safety duct, causing fragments to fall onto the equipment. Similarly, the oil storage tank may also be damaged. Therefore, during vacuum oil injection, it is essential not to install the oil storage tank and safety duct, but instead, temporarily seal them with a cover.

LuShan, est. 1975, is a Chinese professional manufacturer specializing in power transformers and reactors for 49 years. Leading products are single-phase transformer, three-phase transformers, DC inductors, AC reactors, filtering reactor, expoxy resin high-voltage transformer and intermediate, high-frequency products. Our transformers and reactors are widely used in 10 application areas: rapid transit, construction machinery, renewable energy, intelligent manufacturing, medical equipment, coal mine explosion prevention , excitation system, vacuum sintering, central air conditioning.

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