Enclosed Transformer: This type of transformer is enclosed in a metal box for optimal moisture resistance. However, due to their high cost and large size, most of them are used in military equipment or special requirements.

Resin-encapsulated transformers, such as potted encapsulation, can greatly delay the entry of moisture in humid environments and reduce the impact of moisture on them. Another advantage of resin encapsulation is to improve the insulation performance of the transformer and increase the heat dissipation capacity of the transformer. Commonly used resin encapsulation forms include: coil end sealing type, transformer cover type, coil glue filling type, transformer glue filling type, etc. Among them, the glue filling type has the best moisture-proof effect.

Isolation transformer refers to a transformer with electrical isolation between the input winding and the output winding. While avoiding accidental contact with live objects, the isolation of the transformer is to isolate the respective currents of the original secondary winding coils. It was used in the power industry in early European countries and was widely used in the electronic industry or industrial and mining enterprises, machine tools and mechanical equipment for general circuit control power supply, safety lighting and indicator light power supply. The isolation transformer has high insulation strength, isolates different potentials between the primary and secondary windings and suppresses common mode interference. The transformation ratio of an isolation transformer is usually 1:1.

R-type transformer is small in size and light in weight. The R-type transformer is wound with a non-cut iron core and uses high-quality silicon steel sheets with high magnetic permeability, so it is small in size and light in weight.

R-type transformers are highly efficient. Since the core is not cut, the iron loss is very small. High-quality materials and compact structure are used to minimize the distance between the core and the winding, so the efficiency can reach more than 90%.

R-type transformer has small flux leakage. The R-type transformer core has no magnetic gap and the windings are balanced, so the magnetic flux leakage is small.