Selection Guide For Oil-Immersed And Dry-Type Transformers

Jan 07, 2026 Leave a message

To understand the differences, let's look at the "heart"

The biggest difference between these two types of transformers lies in the insulation and cooling methods.

10kV Series Oil-immersed Distribution Transformer

Our oil-immersed transformers use special insulating oil inside. This oil is like a "versatile athlete", capable of both insulation and cooling. Last year, a customer in a southern high-temperature area built a factory where the workshop temperature could reach 45°C in summer. They used our oil-immersed transformer, and it has been operating stably ever since.

35kV On-load Dry-type Transformer

Dry-type transformers, on the other hand, rely on air cooling and solid insulating materials. Their greatest advantage is safety. Last month, for a project at a development zone hospital, the hospital was particularly concerned about the transformer's flame retardancy and low noise. They ultimately chose our dry-type transformer. After all, in places like hospitals, safety and quietness come first.

Which one to choose? It depends on where it will be used

Based on the projects we have done over the years, I have summarized some selection suggestions:

Situations where Oil-immersed transformers are recommended:

Outdoor substations and industrial and mining enterprises

Production lines with large fluctuations in power load

Situations that frequently encounter sudden power loads

When the budget is limited but reliable and durable equipment is desired

Situations where Dry-type transformers are recommended:

Crowded places such as shopping malls, hospitals, and schools

Underground substations and high-rise buildings

Places with strict environmental requirements

When simple and convenient maintenance is desired in the future

Let's talk about our capabilities

We have been deeply involved in the transformer industry for many years and can produce a full range of products from 10kV to 220kV, whether it's oil-immersed or dry-type transformers, all can be customized according to customer needs.

In terms of production capabilities, we do have some strong equipment:

Vacuum casting equipment ensures solid insulation for dry-type transformers

Automated winding equipment guarantees stable product quality for each unit

Strict laboratory testing, every transformer must pass multiple tests

All series meet the national first-class energy efficiency standards, helping customers save electricity costs

Points to note when purchasing

Based on my experience, when buying transformers, pay special attention to:

First, clearly understand the characteristics of your power load, including load size and fluctuation

Carefully investigate the installation environment, including space availability and environmental conditions

Don't forget local climate conditions and altitude, as these can affect transformer selection

Conclusion

After many years in this business, my greatest realization is that there is no best transformer, only the most suitable one. The key is to understand your own needs and then make a choice based on the characteristics of the transformer.

As a professional Chinese Oil-immersed transformer manufacturer, we not only offer competitive prices for Chinese Oil-immersed transformers price but also focus on providing reliable technical support and solutions to our customers. If you are worried about transformer selection, feel free to contact us anytime. We will provide you with the most practical suggestions to help you choose the most suitable transformer.