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

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

“Of course the same is that they are power transformers, there will be the core of the magnetic circuit, the circuit winding. The biggest difference is between “oil” and “dry”. This means that the two cooling media are different, the former is transformer oil (and of course other oils such as beta oil) as a cooling and insulation medium, the latter is air or other gases such as SF6 as the cooling medium. Oil variation is the placing of an iron core and windings in a tank filled with transformer oil. Dry change often put the iron core and winding with epoxy resin pouring package seal, there is also a now much more used non-envelope type, winding with special insulation paper re-immersed special insulation paint, etc., play to prevent windings or iron core moisture. (Also because the two due to the process, use, structure of the classification methods are derived from different categories, so we from a narrow point of view) in terms of yield and dosage, the current dry voltage level is only 35kV, the capacity phase for oil change is small, about 2500kVA. Oil variations with the same voltage level and capacity are complex and costly. So at the moment there is still more oil in terms of usage. However, due to dry change of environmental protection, flame retardant, impact-resistant and other advantages, and often used in indoor and other high-demand power supply and distribution sites, such as hotels, office buildings, high-rise buildings and so on. If you’re just a transformer user, it’s enough to know this.
Each has its own advantages and disadvantages, oil cost is low, maintenance is convenient, but flammable, explosive. Dry change because of its good fire resistance, can be installed in the load center area, in order to reduce voltage loss and power loss. But the dry change price is high, the volume is large, the moisture-proof and dust proof is poor, and the noise is big.
Oil change gradually exit, with dry change, dry change can be opened transport and release, clean, easy to maintain, according to the installation does not require a seat, no seepage tank. From the outside is a good distinction:

The biggest difference between an oil-immersed transformer and a dry transformer is whether there is “oil”, and because the oil is liquid, with fluidity, the oil-immersed transformer must have an external shell, the shell inside is transformer oil, oil soaked in the transformer coil, from the outside is not visible to the transformer coil; Can see directly the transformer coil, there is also a feature is the oil immersion transformer above the oil pillow, the internal storage of transformer oil, but now the new oil immersion transformer also has a transformer production without oil pillow;

Dry type transformer

Oil-immersed transformer in order to heat convenience, that is, for the internal insulation oil flow heat convenient, in the external design of the radiator, like a heat sink, and dry transformer does not have this radiator, cooling by the transformer coil under the fan, the fan is a bit like the indoor machine of home air conditioning;
Oil-immersed transformers are generally installed in separate transformer rooms or outdoors due to fire prevention needs, while dry transformers are definitely installed indoors, generally installed in low-voltage distribution rooms, and low-voltage distribution cabinets installed side by side.

Now you know about the difference about the dry type transformer and oil transformer.

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