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Power transformers are the most important components of electrical energy supply networks. Although these components have high reliability, failures can occur due to external factors such as short circuits in the grid. Failures can also occur due to the ageing effects of the active part, especially the insulation system, or the ageing of important accessories such as bushings or on-load tap changers. In case of failure, the first action is to identify the type of failure. The aim is to localize the failure itself as well as its root cause.

Repairing a transformer instead of replacing it can substantially reduce investment costs and provide a faster turnaround than buying a new transformer. Furthermore, to maximize the asset's technical life, a refurbishment or overhaul can be an intermediate action when no failure has occurred and the ageing of the active part has reached a stage where the continued reliability of the transformer is unacceptable.

For preventive maintenance, refurbishment also known as reconditioning, is a frequently used option, in which equipment is taken to an authorized service workshop for a full inspection, thorough cleaning, and individual component analysis and replacement according to the maintenance schedule. The reconditioned equipment undergoes complete testing and comes with a 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

Workshop repairs

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

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.

Get to know more

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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