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The difference between dry type transformer and oil immersed type transformer

Oct. 17, 2019

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First, the advantages and disadvantages of dry type transformer and oil immersed transformer:

(1) Drying on the price becomes more expensive than oil.

(2) In terms of capacity, large-capacity oil changes more than dry.

(3) Drying is required in integrated buildings (basement, floor, roof, etc.) and crowded places. The oil is used in an independent substation.

(4) The transformer inside the box is generally box-changed. Outdoor temporary electricity is generally oil-based.

(5) Select dry change and oil change according to space during construction. When the space is large, you can choose oil change. When the space is crowded, choose dry change.

(6) The regional climate is relatively humid and hot, and it is easy to use oil. If dry change is used, forced air cooling must be provided.

Second, oil immersed transformer supplier introduce the difference between dry-type transformers and oil-immersed transformers as follows:

1, appearance

The package type is different, the dry type transformer can directly see the iron core and the coil, and the oil type transformer can only see the outer casing of the transformer;

2, the lead form is different

Dry-type transformers mostly use silicone rubber bushings, while oil-type transformers mostly use porcelain bushings;

3, different capacity and voltage

Dry-type transformers are generally suitable for power distribution. The capacity is mostly below 1600KVA, the voltage is below 10KV, and some can achieve 35KV voltage level. The oil-type transformer can do all the capacity from small to large, and the voltage level also does all. Voltage; the UHV 1000KV test line under construction in China must be an oil-type transformer.

4, insulation and heat are not the same

Dry-type transformers are generally insulated with resin, relying on natural air-cooling, large-capacity cooling by fan, and oil-type transformers are insulated by insulating oil. The insulation of the oil inside the transformer will generate a tropical-to-transformer radiator (chip). Cooling on.

5. Applicable places

Dry-type transformers are mostly used in places where “fireproof and explosion-proof” are required. Generally, large-scale buildings and high-rise buildings are easy to adopt; while oil-type transformers may cause oil to be ejected or leaked after “fault”, which is mostly used outdoors. There is also a site where the site "excavation oil pool" is dug.

6, the ability to withstand the load is different

Generally, dry-type transformers should be operated at rated capacity, while oil-type transformers have better overload capability.

7, the cost is not the same

For transformers of the same capacity, the purchase price of dry-type transformers is much higher than that of oil-type transformers.

Dry type transformers generally start with SC (epoxy resin cast encapsulation), SCR (non-epoxy cast solid insulation encapsulation), SG (open type)

8. It is better to distinguish from the outside;

The biggest difference between oil immersed transformer and dry-type transformers is that there is no "oil", and because the oil is liquid and has fluidity, the oil-immersed transformer must have a casing, the inside of the casing is transformer oil, and the oil is immersed in the transformer. The coil does not see the coil of the transformer from the outside; while the dry transformer has no oil, it does not need the outer casing, and can directly see the coil of the transformer; there is also a characteristic that the oil-immersed transformer has an oil pillow on it and is stored inside. Transformer oil, but now the new oil-immersed transformer also has transformers without oil pillows;

The oil-immersed transformer is convenient for heat dissipation, that is, it is convenient for the internal insulating oil to flow and dissipate heat. The heat sink is designed externally, just like the heat sink, but the dry type transformer does not have this heat sink, and the heat dissipation depends on the fan below the transformer coil. The fan is a bit like an indoor unit for home air conditioning;

oil immersed transformer are usually installed in a separate transformer room or outdoors due to fire protection requirements. Dry-type transformers are definitely installed indoors. They are usually installed in low-voltage power distribution rooms and installed side by side with low-voltage power distribution cabinets.

The difference between dry type transformer and oil immersed type transformer

SC(B)10 Series Resin-insulated Dry Type Transformer


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