Seven differences between dry-type transformer and oil immersed transformer
Writer： Hengfeng you electric Time：2023-04-23 views：times
Abstract: What is the difference between dry-type transformer and oil immersed transformer? Both dry-type transformers and oil immersed transformers are power transformers, which are iron cores for magnetic circuits and windings for circuits. The biggest difference is that they have different cooling media. The former uses transformer oil as cooling and insulation medium, while the latter uses air or other gases such as SF6 as cooling medium. Oil transformer is to put the body composed of iron core and winding in the oil tank containing transformer oil.
1. Applicable places
Dry type transformers are often used in places where "fire and explosion protection" is required, generally used in large buildings and high-rise buildings; However, transformers are mostly used outdoors, and there are places where "accident oil pool" is dug, because oil may be ejected or leaked after "accident", leading to fire.
2. Different capacities and voltages
Dry type transformers are generally suitable for power distribution. Most of the capacity is below 1600KVA, the voltage is below 10KV, and some of the voltage levels are 35KV. The oil immersed transformer can achieve full capacity from small to large, and the voltage grade can also achieve all voltages; The UHV1000KV test line under construction in China must use oil transformer.
3. Appearance and shape
Different packaging forms, dry-type transformers can directly see the iron core and coil, while oil type transformers can only see the transformer shell;
4. Form of lead wire
Silicon rubber bushing is used for dry-type transformers and porcelain bushing is used for oil type transformers;
5. Insulation and heat dissipation are different
Dry type transformers are generally insulated with resin and cooled with natural air. Large capacity transformers are cooled with fans. Oil type transformers are insulated with insulating oil. The insulating oil circulates inside the transformer, radiating the heat generated by the coil to the radiator (sheet) of the transformer.
6. Different load bearing capacity
Generally, dry-type transformers shall operate at rated capacity, while oil type transformers have better overload capacity.
7. The cost is different
For transformers with the same capacity, the purchase price of dry-type transformers is much higher than that of oil type transformers.
The model of dry-type transformer generally starts with SC (epoxy resin casting package), SCR (non epoxy resin casting solid insulation package) and SG (open type).
Choose dry type transformer or oil type transformer?
Hengfengyou Transformer: The price of oil has become more expensive than oil. In terms of capacity, the change of oil with large capacity is greater than that of dry oil. Dry transformers are required in complex buildings (such as basements, floors, roofs, etc.) and crowded places. Oil electric transformer is used for independent substation. Box type transformer is generally used. Outdoor electricity is generally changed from oil to electricity. During the construction, dry oil change and oil change shall be selected according to the space. If the space is large, dry oil change can be selected. If the space is crowded, dry oil change can be selected. The area is humid and hot, and the oil is easy to change. If drying equipment is to be used, forced air cooling equipment must be provided.
These are the seven major differences between dry-type transformers and oil immersed transformers. Qingdao Hengfengyou Electric belongs to Hengfengshuai Group. It is a professional electrical company specializing in the production, manufacturing and sales of electrical distribution products, mainly engaged in the production and global sales of distribution transformers, rectifier transformers, furnace transformers, etc. It has provided OEM/ODM services for customers in Europe, America and the Middle East for 20 years. It can provide customized production of transformer core, transformer coil and transformer shell. Hengfengyou Electric will provide you with the best electrical product solutions. https://www.hengfengyou.com ； info@hengfengyou.com WhatsApp：+86158 5325 2696（Jack） +86158 5326 5269（Alisa）
