The cast-resin transformer is a type of dry-type transformer in which the windings are encapsulated in epoxy resin. It is regarded as particularly fire-safe, environmentally friendly, and low-maintenance – making it the first choice in many modern buildings, industrial facilities, and transport infrastructure. Over the years, cast-resin transformers have established themselves in many application fields as the lowest-maintenance and safest alternative to oil technology.
What are the advantages of a cast-resin transformer?
Because the resin does not burn and there is no liquid insulating medium, the risk of oil leaks and large-scale fires is eliminated. Cast-resin transformers meet climate class C2, environmental class E2, and the highest fire behavior class F1. This makes them ideal for use in enclosed spaces, high-rise buildings, tunnels, and sensitive environments.
Key Characteristics at a Glance
- Fire behavior class F1: self-extinguishing, no toxic gases
- Environmental class E2: high resistance to moisture and condensation
- Climate class C2: usable at temperatures down to -25 °C
- Ratings up to 25 MVA and voltages up to 36 kV available
- High mechanical strength against shocks and vibration
- High robustness against mechanical vibration
- Also available for extreme ambient temperatures
Frequently Asked Questions
Are cast-resin transformers more expensive than oil-type transformers?
They are often somewhat more expensive to purchase, but the total cost comparison over the service life often favors the cast-resin variant – thanks to lower maintenance effort, no fire-protection overhead, and longer service intervals.
What is the service life of a cast-resin transformer?
With correct sizing and proper operation, cast-resin transformers can easily operate reliably for 30 years or more. Thousands of units have already been in service for over 40 years.
What are typical application areas?
Indoor substations in high-rise buildings, industrial facilities, hospitals, subways, tunnels, airports, ships, offshore platforms, and wind turbines. Wherever fire protection and environmental compatibility are top priorities, the cast-resin design is the first choice.
What should be considered during transport and installation?
Thanks to the resin, cast-resin transformers are mechanically robust, but should nevertheless be transported with minimal vibration. It is important to maintain minimum clearances, ensure adequate ventilation, consider noise emissions, and connect correctly to the earthing system. Proper installation significantly extends service life.
For your next project with high safety or environmental requirements, we supply the right cast-resin transformer. Talk to our specialists.