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Workshop repairs

Power transformers are among the most important components of electrical energy supply networks. In case of failure, the first action is to identify the type of failure. Being subject to mechanical, thermal, and electrical stress, and even accessory failures, it is important to quickly determine the root cause of failure.

Rehabilitation is another frequently used option, where equipment is taken to an authorized service workshop or directly into a temporary workshop at the site for a full inspection, thorough cleaning, and individual component analysis and replacement to match as new condition. The rehabilitated equipment undergoes complete testing and comes with a new warranty.


Why Hitachi Energy

  • With our base in the manufacture of power and industrial transformers, we can repair not only Hitachi Energy or legacy unit, but also perform reengineering of other makes for repair
  • Either using our TrafoStar™ technology or rewinded as per specification, our stringent processes and quality requirements, mean your transformer will be back in service in the minimum amount of time possible
  • In order to maximize your capital, tackle site constraints, or any other reason, we can repair, refurbish or upgrade your unit based on your needs in a cost-efficient manner

Our Offerings

Power transformer repairs

Few transformers fail due to old age per se, but rather as a consequence of external faults, short circuit faults, insulation failure (dielectric failure), local overheating (causing gassing) or accessory failure (e.g. bushings, tap changers, coolers, surge-arresters).

Distribution transformer repairs

Distribution transformers ranging from 315 kVA to 5 MVA are readily distributed across the distribution networks, forming an integral part of the overall distribution network.

On-site repairs

Thanks to our TrafoSiteRepair offering we can refurbish, repair or upgrade your transformer directly at site avoiding transportation risk and time thus bringing your unit back on-line in weeks or even months faster than a workshop repair or a new transformer delivery.


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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