All makes, not only ours
We repair transformers from any manufacturer. You do not have to go back to whoever built it.
Transformer Repair & Rewinding
Failed units returned to service, not replaced
We repair and rewind transformers of all makes, not only our own. A failed unit is stripped, diagnosed and rebuilt with new windings where required, then re-tested to the same standard as a new build before it goes back to site.
Overview
What this service covers
A transformer that has failed is not usually scrap. Winding faults, bushing failures, tank leaks and tap changer problems are all repairable, and a rewind typically costs a fraction of a replacement while returning the unit to its original rating.
The case for repair gets stronger the larger the unit. Replacing a substation transformer means a new machine, new transport, possibly new foundations and a long lead time. Rewinding the existing one avoids all of it.
We repair units of every make. Being a manufacturer is what makes this possible — the winding shop, the tanking bay and the test floor that build new transformers are the same facilities that rebuild old ones.
What's included
- Fault diagnosis and complete teardown inspection
- HV and LV rewinding to original or uprated specification
- Tank repair, gasket replacement and repainting
- Post-repair routine testing before dispatch
Process
How the job actually runs
These steps happen in this order. The numbering is a sequence, not decoration — each step depends on the one before it.
- 01
Initial assessment
Send us the rating plate details and a description of the fault. Much can be narrowed down before the unit moves, which avoids transporting something that turns out to be uneconomic.
- 02
Collection and teardown
The unit comes to our works, is drained, untanked and stripped so the core, windings and fittings can be inspected directly.
- 03
Fault diagnosis
The actual failure mode is identified — inter-turn fault, earth fault, mechanical displacement from a through-fault, or a fitting failure. This determines whether a rewind is needed or a lesser repair will do.
- 04
Quotation
You get the diagnosis and a firm scope before work starts, so the decision to repair or replace is made with real information rather than an estimate.
- 05
Rewinding
Affected windings are stripped and rewound to the original specification, or uprated where the failure indicated the original design was marginal for the duty.
- 06
Reassembly and tanking
Core and coil are reassembled, clamped and braced, the tank is repaired and repainted, gaskets are replaced, and the unit is filled with treated oil.
- 07
Routine testing
The repaired unit goes through the same routine test set as a new build. It does not leave until it passes.
- 08
Return to site
The unit is returned with its post-repair test certificates, and our onsite team can attend for recommissioning if required.
Benefits
Why it is worth doing
Re-tested to new-build standard
A repaired unit goes through the same routine test set as something leaving the line for the first time.
Diagnosis before commitment
You see the actual fault and a firm scope before authorising the work.
Uprate where it makes sense
If the failure shows the original design was marginal for the duty, the rewind can correct it rather than repeat it.
Industries served
Who calls us for this
The sectors where this service comes up most, and the products it most often applies to.
Power Transformer
Higher-capacity units for substations and heavy industrial loads.
View product →
Furnace Transformer
Heavy-duty units for induction and arc furnace loads.
View product →Knowledge Centre
Transformer Maintenance Checklist for Industrial Plants
A practical monthly, annual and five-yearly schedule for plant transformers — what to check, what to record, and which readings actually predict failure.
Read article →Questions
Common questions
It turns on what failed. Winding faults, bushing failures, tank leaks and tap changer problems are routinely repairable and a rewind usually costs well under a replacement. Core damage is the main case where replacement is genuinely the better answer. Get the unit diagnosed before deciding — the failure mode, not the age of the machine, is what should drive the call.
Yes, and it is a large part of what we do. A transformer is a transformer regardless of the badge on the tank. We need the rating plate data and, ideally, a description of what happened when it failed.
A properly rewound unit is returned to its original rating and re-tested to the same routine test set as a new build. The core, which is the component that genuinely does not wear out, is retained. What matters is that the rewind is done with correct conductor, correct insulation and correct clamping — a poorly braced rewind will fail at the next through-fault regardless of how good the copper was.
TODO_CONFIRM — the client must confirm typical turnaround times by rating, and whether an emergency service is offered.
Enquiries
Need transformer repair & rewinding?
Tell us the make, rating and what the problem is. For breakdowns, call the mobile number directly — it is the fastest route to an engineer.