[Dry-type transformer, oil-immersed transformer] The difference between dry-type transformer and oil-immersed transformer
The difference between dry-type transformers and oil-immersed transformers
1. Appearance
The packaging forms are different. Dry-type transformers can directly see the core and coil, while oil-type transformers can only see the outer shell of the transformer;
2. Lead form Different
Dry-type transformers mostly use silicone rubber bushings, while most oil-type transformers use porcelain bushings;
3. Different capacities and voltages
Dry-type transformers are generally suitable for power distribution. The capacity is mostly below 1600KVA and the voltage is below 10KV. There are also some that reach the 35KV voltage level; while oil-type transformers can be made from small to large. To the full capacity, the voltage level has also reached all voltages; the ultra-high voltage 1000KV test line under construction in our country must use oil-type transformers.
4. Insulation and heat dissipation are different
Dry-type transformers are generally insulated with resin and cooled by natural air. Large capacities are cooled by fans, while oil-type transformers are The transformer is insulated by insulating oil, and the circulation of the insulating oil inside the transformer transfers the heat generated by the coil to the radiator (chip) of the transformer for heat dissipation.
5. Applicable places
Dry-type transformers are mostly used in places that require “fire protection and explosion protection”, and are generally easy to use in large buildings and high-rise buildings; Oil-type transformers may spew out or leak oil after an “accident”, causing fires. Most of them are used outdoors, and there are sites where “accident oil pools” are dug.
6. Different load bearing capabilities
Generally, dry-type transformers should operate at rated capacity, while oil-type transformers have better overload capabilities.
7. The cost is different
For transformers of the same capacity, the purchase price of dry-type transformers is much higher than that of oil-type transformers.
Dry-type transformer models generally begin withChoose dry-type or oil-type transformer for SC (epoxy resin cast encapsulated), SCR (non-epoxy resin cast solid insulation encapsulated), SG (open type)
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Dry type is more expensive than oil type. In terms of capacity, large-capacity oils produce more oil than dry ones. Dry inverters need to be used in complex buildings (basements, floors, roofs, etc.) and in crowded places. Oil transformers are used in independent substations. The transformer inside the box transformer is generally a box transformer. Oil transformers are generally used for temporary outdoor electricity use. During construction, dry and oil transformers are selected according to the space. When the space is large, oil transformers can be selected, and when the space is crowded, dry transformers can be selected. The regional climate is relatively humid and hot, so it is easy to use oil. If dry conversion is used, forced air cooling equipment must be installed.
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