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Trafo Site Repair

Our on-site repair is achieved by bringing the transformer factory setup to the work site. Trafo Site Repair 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, which are manufactured in transformer factories under strict quality standards.

Trafo Site Repair has been used worldwide for the repair of over 400 transformers including ultra high-voltage and converter transformers, industrial units, and shunt reactors. Trafo Site Repair 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 Trafo Site Testing, a compact high-voltage test system, and Low-Frequency Heating, a special Hitachi Energy technology for high-temperature transformer dry out in the field. Trafo Site Testing enables on-site high-voltage laboratory testing such as applied and induced voltage tests with partial discharge measurements, heat run, and impulse tests.

Trafo Site Testing 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 is capable to reduce moisture in cellulose to less than 1%.

Hitachi Energy's Trafo Site Repair provides customers with a complete transformer on-site solution by combining state-of-the-art technology with our extensive experience.

Workshop repairs

Power transformers are among the most important components of electrical energy supply networks.


Repairing a transformer instead of replacing it can substantially reduce investment costs and provide a faster turnaround than buying a new transformer.

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Transformer service

Aging assets, rising energy demand and the critical need to avoid unplanned outages are challenging utilities and industrials around the world. Hitachi Energy is the largest transformer service organization, Global expertise close to our customers.
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.
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