Recently, we received some inquiries from customers about dry-type transformers and oil-immersed transformers.
As you may know, dry-type transformers are generally more expensive compared to oil-immersed transformers. But why? What’s the difference between them?
Let Catherine explain it to you today!
Installation Location
Dry-type transformers are preferred for indoor locations such as basements, floors, and rooftops, especially in areas with high human population density oil-immersed transformers are typically used in substations.
Application
Box-type transformers are generally used for indoor applications, while oil-immersed transformers are commonly used for outdoor temporary power supply.
Space Considerations
The choice between dry-type and oil-immersed transformers depends on the available space. oil-immersed transformers are suitable for larger spaces, while dry-type transformers are preferred in compact spaces.
Climate: oil-immersed transformers are more suitable for humid and hot environments. If dry-type transformers are used in such conditions, they must be equipped with forced air-cooling systems.
Appearance
Dry-type transformers have visible cores and coils, while oil-immersed transformers are enclosed and only the outer shell is visible.
Connection
Dry-type transformers mostly use silicone rubber bushings, while oil-immersed transformers often use porcelain bushings.
Capacity and Voltage
Dry-type transformers are mainly used for distribution purposes, with capacities up to 1600 KVA and voltages below 10 KV. oil-immersed transformers can handle all capacities and voltage levels, including high voltage such as 1000 KV.
Insulation and Cooling
Dry-type transformers use resin insulation and rely on natural or forced-air cooling, while oil-immersed transformers use insulating oil for insulation and heat dissipation through radiators or cooling fins.
Suitable Locations
Dry-type transformers are commonly used in fireproof and explosion-proof environments, often in large and high-rise buildings. On the other hand, oil-immersed transformers are typically installed outdoors with provisions for an "incident oil pit" in case of leaks or spills.
Load-Bearing Capacity
Dry-type transformers should operate within their rated capacity, while oil-immersed transformers have better overload capacity.
Cost
Dry-type transformers are generally more costly compared to oil-immersed transformers of the same capacity.
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