The differences between oil type transformer and dry type transformer

1. Different appearance of oil type transformer and dry type transformer

Different packaging forms, dry-type transformers can directly see the iron core and coils, while oil-type transformers can only see the shell of the transformer.

2. lead form of oil type transformer and dry type transformer are different

Most of dry-type transformers use silicone rubber sleeves, while oil-type transformers mostly use porcelain sleeves

3.Capacity and voltage of oil type transformer and dry type transformer are different

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

4. insulation and heat dissipation of oil type transformer and dry type transformer are not the same

Dry-type transformers are generally insulated with resin, relying on natural air cooling and large-capacity cooling by fans while oil-type transformers are insulated by insulating oil and the circulation of the insulating oil inside the transformer transfers the tropical heat generated by the coils to the transformer’s radiator (sheet) for cooling.

5. Different applicable places of oil type transformer and dry type transformer

Dry-type transformers are mostly used in places that require “fire and explosion-proof” and are generally easy to use on large buildings and high-rise buildings. Oil-type transformers are mostly used outdoors because of the possibility of oil spraying or leaking after an accident, resulting in fire And there are places for digging “accident oil pools”.

6. Bearing capacity of oil type transformer and dry type transformer

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

7. The cost of oil type transformer and dry type transformer is different

For transformers of the same capacity, the purchase price of dry-type transformers is much higher than that of oil-type transformers. Models of dry-type transformers generally start with SC (epoxy resin casting and encapsulation type), SCR (non-epoxy resin casting and solid insulation encapsulation type), and SG (open type)