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Repair and Upgrade for Sustainable Life Extension and New Manufacturing Solution

Our on-site repair is achieved by bringing the transformer factory setup to the work site. TrafoSiteRepair™ service is executed to the same high-quality standard as a workshop repair. This is done by mobilizing special equipment and tools needed to perform any scope of work, from refurbishment and upgrades to replacing all windings manufactured in transformer factories under strict quality standards.​

TrafoSiteRepair™ has been used worldwide to repair over 400 transformers, including ultra high-voltage and converter transformers, industrial units, and shunt reactors. ​

TrafoSiteRepair™ has saved utilities and industrial users millions of dollars by reducing downtime in installations where production losses per day can be extremely high. With on-site repair, transport to a repair facility can be avoided, reducing risk and saving cost and time.​

Significant progress in power electronics led Hitachi Energy to develop TrafoSiteTesting™, a compact high-voltage test system, and Low-Frequency Heating, a special Hitachi Energy technology for high-temperature transformer drying out in the field. TrafoSiteTesting™ enables on-site high-voltage laboratory testing such as applied and induced voltage tests with partial discharge measurements, heat run, and lightning impulse tests.​

TrafoSiteTesting™ may also be used for condition assessment (preventive measure), transformer troubleshooting (failure identification and localization), and as an extra quality check measure on new units after transportation and installation.​

Low-frequency heating technology decreases the drying time by more than 50% compared to conventional methods and can reduce moisture in cellulose to less than 1%.​

TrafoSiteRepair™ provides customers with a complete transformer on-site solution by combining state-of-the-art Hitachi Energy´s technology and materials, our extensive experience with its legacy brands, and support from the local and global network in more than 30 countries.

Transformer Service Onsite Repairs
430 on-site repairs
successfully executed
TrafoSiteRepair™ performed in 37 countries all around the world
Core and Shell Transformer
technologies supported
Sustainability framework around efficiency, circularity, and material avoidance

Workshop Repairs for Distribution and Small Power Transformers

Hitachi Energy offers workshop repairs for distribution and power transformers ranging from 315 kVA to 5 MVA.

Workshop Repairs for Medium and Large Power Transformers

Hitachi Energy offers workshop repairs for medium and large power transformers.

Workshop Repairs for Traction Transformers

Hitachi Energy offers workshop repairs for traction transformers to prevent unpredicted failure and ensure a long transformer life.

Transformer Refurbishment

Hitachi Energy offers refurbishment services to cover transformer rehabilitation and sustainable life extension to advance a sustainable energy future for all.

Transformer Component Upgrades

Transformers component upgrades are based on Hitachi Energy's decade-long experience in manufacturing and maintaining its products.


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Transformer service

Aging assets, rising energy demand, and the critical need to avoid unplanned outages are challenging worldwide utilities and industrials. The service portfolio of Hitachi Energy allows utilities and industrials to maximize the return on transformer assets by ensuring high reliability, reducing life cycle costs, and ensuring optimized performance while lowering environmental impact.
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.