Transformers are essential equipment in power systems and are generally divided into dry-type transformers and oil-immersed transformers. Understanding their differences and applications helps companies and users make the right choice.

1. What is a dry-type transformer?

A dry-type transformer uses air or other insulating materials for cooling, without oil immersion. It is usually installed indoors and is environmentally friendly and safe.

Advantages:

• Oil-free – environmentally safe, no fire hazard;

• Easy maintenance, long service life;

• Suitable for rooms and areas with high safety requirements.

Disadvantages:

• Larger size, limited cooling capacity;

• Higher cost.

2. What is an oil-immersed transformer?

An oil-immersed transformer uses transformer oil for cooling and insulation, which provides efficient heat dissipation and improved insulation performance. It is suitable for outdoor use and heavy load applications.

Advantages:

• Excellent cooling performance, ideal for high load and harsh conditions;

• Compact size, stable operation;

• More economical in terms of price.

Disadvantages:

• Requires regular inspection and oil maintenance;

• Risk of oil leakage and fire;

• Restricted in environments with strict environmental requirements.

3. How to choose?

Usage conditions

• For indoor applications with strict safety and environmental requirements – dry-type transformer is recommended;

• For open areas and heavy loads – oil-immersed transformer is preferred.

Service capability

• If maintenance resources are limited – dry-type transformer is better;

• If qualified personnel are available – oil-immersed transformer is also suitable.

Budget

• With sufficient budget and emphasis on eco-friendliness – dry-type transformer;

• With limited budget but higher performance demand – oil-immersed transformer.

4. Conclusion

Both dry-type and oil-immersed transformers have their own advantages and disadvantages. The choice depends on operating conditions, requirements, and budget. A proper selection ensures reliable and durable operation of the equipment, thereby improving the efficiency and safety of the electrical system.