Outdoor enclosures for dry-type transformers
At TMC Transformers, we have engineered a robust and reliable solution for the outdoor installation of dry-type transformers - without compromising performance, safety, or longevity.
Over the years, our R&D and engineering teams have developed a comprehensive system of protective enclosures and advanced cooling technologies that allow our transformers to operate efficiently even in the most challenging outdoor environments.
Engineered protection enclosures
Outdoor conditions demand more than just weather resistance—they require engineered protection. TMC designs and manufactures custom protective enclosures with a wide range of Ingress Protection (IP) ratings, from IP21 to IP67, depending on the environmental and application-specific requirements. Each enclosure is designed to:
- Shield the transformer from dust, water, humidity, and corrosive agents.
- Ensure mechanical protection against impacts and external objects.
- Maintain internal thermal stability while minimizing exposure to external air.
The choice of IP rating is based on a detailed analysis of the installation site, including climate, altitude, pollution level, and ventilation constraints. Our engineering team works closely with clients to define the optimal configuration for each project.
Guide to transformer IP enclosure types
- IP21: suitable for indoor use with minimal exposure to moisture.
- IP23: often used in semi-protected outdoor environments.
- IP34/44: suitable for more exposed outdoor areas as industrial and infrastructure applications.
- IP55: ideal for harsh outdoor environments with high exposure to dust and rain.
- IP67: designed for extreme conditions where temporary submersion or complete sealing against fine dust is required.
One of the key challenges in outdoor installations is restricted airflow. High-IP enclosures naturally limit the exchange of air, which can affect the transformer's ability to dissipate heat. To address this, TMC has developed dedicated cooling systems more detailed on the dedicated page.
A transformer enclosure protects the transformer from environmental hazards such as dust, moisture, and corrosive agents, while also ensuring safety for personnel by preventing accidental contact with live components.
TMC enclosures go further by adding smart cooling systems and strong mechanical protection, all customized to fit the specific installation needs.
High-IP enclosures naturally restrict airflow, which can impact thermal performance. TMC overcomes this challenge with dedicated cooling systems, including forced ventilation and heat exchangers, ensuring optimal transformer performance even in sealed environments.
Absolutely. TMC enclosures are designed for extreme outdoor conditions, including:
- Marine and offshore applications.
- Mining tunnels and pressurized substations.
- High-altitude or high-pollution zones.
Yes. All TMC enclosures are designed and manufactured in full compliance with IEC, IEEE, ANSI, CSA, and UL standards, ensuring safety and compatibility across international markets.
What sets TMC apart is that each enclosure is engineered based on the specific conditions of the installation site - including climate, altitude, pollution level, and ventilation needs.