Transformer services

Preventive maintenance is built around structured diagnostics. A tiered testing program runs from routine visual inspection through electrical measurements to high-voltage evaluation, and insulating-oil services keep the oil within specification: cleaning removes deposits and impurities from internal components, drying eliminates moisture from insulation and oil to slow aging and reduce failure risk, and regeneration restores oil quality, removes contaminants and extends transformer life. Lab-based oil analysis and material testing identify aging early and guide the servicing strategy for each unit.

When a transformer needs restoring rather than maintaining, repair, refurbishment and retrofit solutions bring it back to — or beyond — its original condition. Repairs cover precision work and replacement of critical components such as windings, bushings, on-load tap-changers and seals, with comprehensive testing and full documentation of the repair scope and results. Refurbishment renews internal and external components and insulation for cost-effective life extension of aging assets, and retrofit solutions modernize the unit to current standards — cooling-system upgrades for thermal optimization, control-cabinet modernization, integration of digital monitoring and analytics, and special measures such as seismic protection on request. Repair and refurbishment can be carried out on site or in a workshop depending on the requirements.

Beyond single interventions, long-term service programs provide structured, multi-year support tailored to a site's operational priorities — modular packages spanning diagnostics, modernization and digital enablement, combined with predictive maintenance and expert consulting for an aging or growing fleet. For emergencies, mobile transformer solutions can be deployed rapidly to restore grid stability while a failed or offline unit is repaired or replaced.

Example: the operator of an aging power transformer reports rising moisture in routine oil sampling. The service team runs the tiered diagnostic program — visual inspection, electrical measurements and a high-voltage evaluation — and confirms the oil is out of specification but the active part is sound. Rather than replace the unit, they schedule on-site oil drying and regeneration to restore oil quality, replace two ageing bushings, and propose a long-term service program covering periodic oil analysis for the rest of the fleet. A mobile transformer is held as an emergency option in case the outage window needs to be extended.

1. Request a service via the transformer product page or the services section, stating transformer type, rating and any known condition data.
2. Identify the unit and any manufacturer — servicing is available for all transformer types and OEMs, not only original-equipment units.
3. The service team scopes the work: preventive maintenance and diagnostics (oil analysis, tiered electrical testing), oil treatment (cleaning, drying, regeneration), or repair, refurbishment and retrofit where restoration is needed.
4. Agree whether the work is performed on site or in a workshop, and confirm the outage window and site access.
5. Qualified transformer specialists carry out the service; critical components (windings, bushings, on-load tap-changers, seals) are replaced or restored where required.
6. You receive documented results — test and oil-analysis findings, repair scope and prioritized follow-up — and can extend coverage through a long-term service program across the wider fleet.

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