Environmentally friendly cast resin insulated transformers

There are many names for transformers, and they can be called by different names. We use cast resin insulated transformers, which can also be called epoxy insulated transformers.

Cast resin insulated transformers are often used in environments where fire and personnel risks must be eliminated. At the same time, operational safety must be 100%. Examples include transformers for heavy industry, mines, tunnels, hospitals, airports, data centers, shopping malls and sports arenas. Our environmentally friendly transformers are found in thousands of such facilities around the world, so we know what is required. That's why we only use selected European manufacturers, each of them experts in their field. You can therefore rest assured that we can always offer a transformer that is tailored to your particular application.

Why should I choose an environmentally friendly cast resin insulated transformer from Unitrafo?

Contains no liquids, minimizing the risk of poisoning the environment and people
Non-explosive and self-extinguishing in case of external fire. No costly fire protection equipment needed
Unlike conventional dry-type insulated transformers, cast resin insulated transformers can be used to a greater extent in environments with high humidity and heavy soiling
Fiberglass reinforced windings minimize the risk of cracking and make the transformer insensitive to rapid temperature changes
Molded-in, vacuum-free windings - Partial discharges <10 pC, minimizing the risk of breakdown
Can be installed in ambient temperatures from -60°C to +60°C and can therefore be used in both arctic and tropical environments
The thermal inertia of the windings makes them resistant to short-term overloads
Can be designed for all possible applications, such as harmonic drift, seismic stresses and varying load cycles
Also available for outdoor installation with special enclosures up to IP56
High short circuit strength
Easy installation - saves time
Virtually maintenance-free

Technical data - cast resin insulated transformers

Effekt	10 kVA - 30 MVA
Konstruktionsspänning	upp till 52 kV
Temperaturklasser (material)	F (155°C), H (180°C)
Omgivningstemperatur	-60°C till +60°C
Lindningsmaterial	Aluminium alt Koppar
Isolationsmaterial	Gjutharts (epoxi/epoxy)
Kapslingsklasser	IP21 till IP56
Tillbehör	Tempvakter, PT100-givare, Fläktar för forcerad kylning, vibrationsdämpare, jordningskopplare etc. Se även Tillbehör i Produktmeny
Klassning	E2, C2, F1 är standard, men även E3 (IEC60076-16) samt C4 (GOST-R) är möjligt.
Kylning	AN / ANAF / AFWF
Frekvenser	50 Hz, 60 Hz, 16 2/3 Hz
Partiella urladdningar	<10 pC

Our cast resin insulated transformers, adapted for industry, are available in two standard versions: Environment Eko2® and Environment Plus® - both with different levels of power losses so you can choose the right transformer for your needs. All types of course also comply with the Ecodesign Directive; EU regulation 548/2014 phase 2.

We also manufacture these transformers for inverter drives, magnetization, earthing, wind power and other purposes. Some transformers for special applications do not need to be manufactured according to Eco design and therefore, if necessary, you can design a type that fits exactly the needs you have. Please contact us if you would like to know which types you can use for your particular application.

Eco-friendly transformer - A good deal for both industry and the environment

2011 we introduced Miljö Plus®, a type of transformer that has become standard for many of our customers. Miljö Plus® has extremely low load losses and has therefore become a big seller to industries, which generally have a higher average load than, for example, grid companies. Customers who have chosen Miljö Plus include Assemblin, Midroc, Caverion, Volvo, Holmen Paper, Ovako Steel and others.

2013 we introduced Environment Max® - an industrial transformer with amorphous core that provides extremely low no-load losses. We recommend this transformer when you have a high loss rating and low average load. As mentioned, Miljö Max® is a transformer with an amorphous core plate and this enables a dramatic reduction of the no-load losses - in fact up to 75% compared to a standard transformer! For example, a 1250 kVA amorphous core can save up to 16000 kWh in one year. So far, it is relatively expensive to manufacture cores from amorphous core plate and therefore this type of transformer commands a higher price, but at high loss ratings and low loads they can still be a good investment.

Under 2014 a third variant was also introduced in our environmental series, Environmental Eko®. This type was developed earlier than necessary so that even before the Ecodesign requirements came into force, you could buy a transformer that was guaranteed to comply with the new rules. Since its introduction, we have delivered thousands of transformers of this type.

2017 the latest transformer in our environmental series, Environment Eko2®. It meets the requirements of the EU Eco design Tier 2, which came into force on July 1, 2021. Today, this is the new "standard transformer" So if you want a future-proof plant at a competitive price, this is the one to choose.

Why amorphous alloy in the transformer core?

Metals have a crystalline structure with a regular structure of atoms. An amorphous metal, on the other hand, has an irregular structure. The amorphous structure is achieved by the metal rapidly changing from liquid to solid form, usually by rapid cooling. The metal then retains its irregular structure and becomes amorphous. In the past, making amorphous metal was considered almost impossible, but now a reliable technique has been found. Amorphous metal is very strong and has very good magnetic properties, but it requires advanced technology and special machinery to produce.

What type of transformer should I have?

In general, we recommend Miljö Eko2® - for low to medium loads and Miljö Plus® - for medium to high loads.

If you want to see in more detail how the different loss values affect the total cost, we recommend that you visit our calculator page. There are several useful calculations for those who are considering investing in a new transformer.

General facts for Cast resin insulated transformers

Gentle transformations for the environment
They do not contain any liquids, toxins or gases that could be harmful. They can be placed outdoors in sensitive areas, for example near water sources.

Safe transformers
Cannot self-ignite and thus cannot cause a fire. In case of external fire they are self-extinguishing.

Economical transformers
The installation does not require any additional safety arrangements and the transformers can usually be installed close to the load. Overall, this results in significant savings in installation costs.

Moisture-resistant transformers
Compared to conventional dry-type transformers, they are more moisture-resistant and better able to withstand aggressive environments. Glass fiber reinforced windings minimize the risk of cracking and make the transformer insensitive to rapid temperature changes

Competitive transformers - for all applications
Transformers for distribution, drive and magnetization. Power transformers, zero-point transformers and special adaptations, for example with reduced magnetic fields.

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