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What is the Difference about the Dry Type Transformer and Oil Type Transformer?

What is the difference about the dry type transformer and oil type transformer?

“Of course, the same thing is that all power transformers have cores for magnetic circuits and windings for circuits. The biggest difference is between “oil” and “dry”. That is to say, the cooling medium of the two is different. The former uses transformer oil (of course, there are other oils such as β oil) as the cooling and insulation medium, and the latter uses air or other gases such as SF6 as the cooling medium. Oil transformer is to place the body composed of iron core and winding in a tank full of transformer oil. The dry transformer often encapsulates the iron core and winding with epoxy resin casting. There is also a kind of non encapsulating type which is much used now. The winding is impregnated with special insulating paper and then with special insulating paint to prevent the winding or iron core from getting damp. (also because different classification methods in process, application and structure derive different categories, so we can narrow the sense) in terms of output and consumption, the current voltage level of dry transformer is only 35kV, and the capacity is smaller than that of oil transformer, about 2500kVA. Moreover, the manufacturing process of dry transformer is more complex and cost-effective than that of oil transformer with the same voltage level and capacity It’s also high. So at present, the amount of oil is more. However, due to its advantages of environmental protection, flame retardancy and impact resistance, it is often used in indoor and other high-demand power supply and distribution stations, such as hotels, office buildings, high-rise buildings and so on. If you’re just a transformer user, that’s enough to know. ”


Each has its own advantages and disadvantages. The cost of oil transformer is low and maintenance is convenient, but it is flammable and explosive. Due to its good fire resistance, dry transformer can be installed in the load center area to reduce voltage loss and power loss. However, the dry transformer has high price, large volume, poor moisture-proof and dust-proof performance, and large noise.
With the help of dry transformer, it can be disassembled for transportation and defecation. It is clean and easy to maintain. According to the installation, it does not need the machine base, and there is no oil seepage pool. It is easy to distinguish from each other in appearance:
The biggest difference between oil immersed transformer and dry-type transformer is whether there is “oil”. Because the oil is liquid and has liquidity, the oil immersed transformer must have a shell. The inside of the shell is transformer oil, and the coil of the transformer is soaked in the oil, and the coil of the transformer can not be seen from the outside; while the dry-type transformer does not have oil, so the shell is not needed, and the transformer can be seen directly There are oil conservator on the oil immersed transformer and transformer oil is stored inside, but the new oil immersed transformer also has transformer production without oil conservator;


For the convenience of heat dissipation, that is to say, for the flow and heat dissipation of internal insulating oil, the oil immersed transformer has designed a radiator on the outside, just like a heat sink, but the dry-type transformer does not have this radiator. The heat dissipation depends on the fan under the transformer coil, which is a bit like the indoor air conditioner;
Because of the need of fire protection, the oil immersed transformer is generally installed in a separate transformer room or outdoor, while the dry-type transformer must be installed indoors, generally installed in the low-voltage distribution room, and installed side by side with the low-voltage distribution cabinet.

Now you know what is the difference about the dry type transformer and oil type transformer, wish can help you.

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