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Workshop Repairs for Distribution and Small Power Transformers

Distribution and small power transformers ranging from 315 kVA to 5 MVA are readily distributed across the distribution networks, forming an integral part of the overall distribution network. Upon receipt of the transformer in the factory for repair, visual and electrical control will be performed.

Based on the scope of work and repairs generally, the repair time for the distribution is short, and in some cases, it could be between 3-5 weeks.

In some cases, it may require replacing items that are not normally stock items. In those cases, the lead times are adjusted after reviewing with the customer.

Workshop repairs for Distribution and Small Power Transformers

Scope of work

The transformer is inspected on arrival to determine the course of action and what rehabilitative actions should be performed. This can include an electrical condition assessment and visual inspection of the transformer tank, expansion tank, radiators, fans, and internal cleaning and inspection.

Depending on the size and the inspection, intervention of active parts, including the repair of minor insulation damage, can be performed.

Service on accessible parts such as the tap changer, bushings, oil handling, drying the active part, and necessary tests are performed before returning the unit back to the customer.

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.

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.