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CompactCool™ Technology

Think Big. Install Small.

CompactCool™ Technology for dry-type transformers

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The development of a sustainable energy future is powered by innovation. It’s the innovation that will drive our transition to clean energy. Innovation which will resolve the increasingly complex challenges of creating an environmentally stable world. And at Hitachi Energy, we never stop innovating.

We believe our latest innovation, the CompactCool™ technology, will unlock new applications for dry-type transformers. This is because CompactCool™ is a unique combination of safety, low maintenance, and reduced operating costs, all these with up to 50% smaller footprint than standard dry-type transformers.

Combining the Best of Dry-Type and Liquid Cooling Mechanism

Depending on the insulation technology, transformers are broadly segregated into two categories – dry-type and liquid-filled or liquid-immersed. In the latter, the insulation liquid also acts as a cooling agent to disperse or absorb heat generated by the windings. In dry-type transformers, the windings are air-cooled. While liquid-filled transformers bring advantages in terms of size and weight, losses & efficiency, noise, and overload capability to the table, dry-type transformers are preferred for fire safety, environmental safety, lower maintenance cost, and short circuit strength.

But what if there was an opportunity to get the best of both technologies in one single transformer type?

Hitachi Energy introduces the CompactCool™ technology for transformers which combines the advantages of both liquid-filled and dry-type cooling technology. CompactCool™ retains the benefits of a dry-type transformer while reducing transformer size, weight, and no-load losses as well as creating the ability to extract losses in an innovative and controlled manner.

This makes CompactCool™ ideal for data center and renewable energy segments, where factors such as optimized footprint, safety, and low maintenance are key to sustainable transformer operations.

The CompactCool™ technology combines dry-type solid insulation with direct liquid-cooling to deliver: 

How it works

CompactCool™ leverages an advanced cooling mechanism
where a liquid coolant is used inside of the coils to extract the
losses out of windings and circulate them through an external heat exchanger.
The watts (heat) then get dissipated to an external ambience (to air or to a water
circuit supply). CompactCool™ does not require an enclosure unless it is requested by customers. 



Applications for CompactCool™

Compact form factor and smaller transformer footprint requirements are often seen as a challenge in sectors like renewable energy production. Wind industry transformers, for instance,  need to be installed on the ground floor of wind towers, on the first level, or inside of turbine nacelle platforms, where the available space for transformer installation is often limited. It is here where CompactCool™ technology creates a difference by solving the dimensional constraints of transformer installation while offering ease of logistics, footprint optimization, and reduced installation costs.

Why choose CompactCool™?

The reduction in footprint, which can be as much as 50%, unlocks endless possibilities for wind and solar power generation, easing logistics and lowering both space requirements and installation costs.

With 90% of losses captured when the transformer is 100% loaded, CompactCool™ technology installed in a data center can help to improve efficiency metrics by enhancing power usage effectiveness.

Overall, the CompactCool™ technology from Hitachi Energy infuses safety and reliability into transformers through:

  • Optimized cooling
  • Low no-load losses
  • Minimized volume of liquid coolant
  • Low-cost maintainability and trouble-free operations

With CompactCool™ Technology, installing transformers in small enclosures or wind towers wouldn’t be an issue anymore. Join us as we orchestrate a transformer innovation that perfectly blends the value propositions of both dry-type and liquid-filled transformers.

Live, interactive session:

Unlocking new applications for dry-type transformers with CompactCool™ Technology

Watch the live, interactive session with Müge Özerten, Global Product Manager of Dry-type Transformers at Hitachi Energy.

Discover how the unmatched safety, reliability, and reduced size dimensions of CompactCool™ opens limitless possibilities for dry-type transformer applications.


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Dry-type distribution transformers

Hitachi Energy offers a wide-range of dry-type distribution transformer products with primary voltages up to 72.5 kV. Our dry-type distribution transformer products are manufactured in accordance with industry demands and international standards, including IEC, ANSI, and ISO 9001.
Hitachi Energy Power Transformers


Hitachi Energy offers distribution and power transformers, Dry-type and EconiQ™ Transformers as well as services, for industrial and commercial applications.