Dry-type transformers and oil-immersed transformers-Iota

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News > Dynamic industry > Dry-type transformers and oil-immersed transformers

Dry-type transformers and oil-immersed transformers

Definition:
Oil-filled transformers: to rely on oil as a cooling medium, such as oil-immersed self-cooled, oil-cooled, oil cooled and forced oil circulation. Plants normally used for main transformer thermal power booster stations, ratio 20KV / 500KV, or 20KV / 220KV, generally driven by its own power plant for the load (eg mill, Fan, blower, circulating pumps, etc.) with a transformer also the oil-immersed transformers, its ratio is 20KV / 6KV. Oil-type transformers rated voltage 3-35kV levels.
Dry-type transformers: to rely on air convection cooling, generally used for lighting, electronic circuits office, floor city hall, museum, the other high-end areas and other small capacity transformers. Variable ratio 100000V / 400V, with a rated voltage for 380V, 220V load.
The difference:
Oil-filled transformers: one, only to see the transformer oil transformer enclosure;
2, the majority of oil-immersed transformers using ceramic casing;
3, oil-immersed transformers but they can all be done from small to large capacity, voltage rating also do all voltages;
4, oil-immersed transformers insulated by insulating oil, insulating oil rely on for cooling in the tropical circulation inside the transformer coil transformers produced to the radiator (tablets).
5, after the oil-immersed transformers due to "trouble" may have oil discharge or leak, resulting in fires, mostly used in outdoor.
6, oil-immersed transformers to lower prices;
7, in general oil-immersed transformer is the textiles from natural wood, cotton, paper, fiber, acetate fiber and polyester amine-based textiles, and ease of thermal decomposition, and lower melting point plastic working in mineral oil or through the oil-impregnated resin adhesive, which limits the operating temperature is 105 ℃.
Dry-type transformers: 1. From the exterior, dry-type transformers can directly see the core and coil;
2, the lead is not the same form, dry-type transformers are mostly using silicone rubber casing;
3, different capacity and voltage, dry-type transformers are generally applicable to power distribution, mostly in 1600KVA below capacity, voltage 10KV following;
4, insulation and heat are not the same, dry-type transformers for general use resin insulated by natural air cooling;
5, from the application areas that are mostly used in dry-type transformers need to "fire, explosion," the place, usually large buildings, high-rise buildings on the easy adoption;
6, cost is not the same, for the same capacity of the transformer, the purchase price of a high dry-type transformers;
7, dry-type transformers commonly used class H insulation material that is used as a reinforcing inorganic materials, mica products, thickening of the F-class materials, composite mica, silicone mica products, silicon organic paint, Silicone rubber polyimide composite glass cloth, composite film, polyimide varnish, with its extreme operating temperature is 180 ℃.

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