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Workshop Repairs for Traction Transformers

As a crucial part of the traction chain, the onboard traction transformer adapts the electrical voltage from the overhead power lines to the lower voltage levels needed within the traction chain. It also feeds auxiliary converters for other electrical systems like lighting, heating, and/or onboard information systems.

If the traction transformer fails, the planned train traffic schedule may be disturbed and leads to passenger inconvenience, and even costly penalties may be incurred.

Workshop repairs for Traction Transformers

Scope of work

A traction transformer is highly reliable and designed to perform under harsh conditions. However, to prevent unpredicted failure and ensure a long lifetime, some services are advised during the whole life cycle.

The operating conditions of a traction transformer differ highly from power transformers. Therefore the interpretation of condition checks has to be done by traction experts; otherwise, misleading results may occur.

Regular oil analysis gives a good image of the actual health. Additionally, basic and advanced diagnostic tests can provide further information.

If an onboard traction transformer gets damaged by an accident or due to other reasons, we are able to fully repair the traction transformer by replacing damaged parts of the core, winding reclamping, partial or full winding replacement, and repair of the tank. At the end of such work, all electrical routine tests are done.

During the long lifetime of a vehicle, some operational conditions change. Upgrading or replacing some parts of the traction transformer can help ensure further operation.

A midlife overhaul is recommended to ensure reliability in the second half of the lifetime. All traction transformers are systematically checked and maintained by replacing parts with lower lifetime expectancy.

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.

Transformer Refurbishment

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

On-site Repairs

Hitachi Energy offers on-site repairs to bring the transformer factory setup to the work site with the TrafoSiteRepair™ service that is executed to the same high-quality standard as a workshop repair.

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.