What we buy
Ranges we buy on this page
Rewinding replaces damaged windings, but it does not automatically restore a damaged core, leaking tank or cracked bushing. This guide explains how to compare rewind work with replacement and judge whether a core merits reuse.
| Phase | kVA | Voltage | Fluid |
|---|---|---|---|
| 1-phase | 10 - 333 kVA | up to 25 kV | Liquid or dry |
| 3-phase | 50 - 20,000 kVA | 115 kV | Liquid or dry |
Who we buy from
Six kinds of seller
- Recyclers
- Electrical contractors
- Equipment dealers
- End users
- Demo contractors
- Distributors
Fast offers
A written offer the same business day, based on your photographs.
Dedicated logistics
Our own crew, trailer and crane, not a brokered haul.
No broker fees
One buyer from first call to cleared pad, with nothing skimmed.
How it works
Six steps from photograph to payment
- 01
Take pictures
Photograph the nameplate, the inside of the cabinet and the tank from both ends. Four frames on a phone are enough to price most units.
- 02
Send them to us
Email or text the photographs with the site address and whether the unit is still energised. We reply the same business day with questions or a number.
- 03
Review the offer
The offer names the unit, the site, the price and the pickup window. It is written, dated and good for thirty days unless the unit changes hands.
- 04
We schedule freight
A crew, a trailer and a crane if the pad needs one. You get the date and the arrival window, and the site does not have to close for it.
- 05
Testing on arrival
Winding resistance, insulation resistance and a turns ratio check, plus oil analysis where the unit is liquid-filled. Results travel with the unit.
- 06
Get paid
Payment is released against the signed bill of sale and the scale ticket, by check or ACH, with the paperwork copy left on site.
What we handle
The parts sellers dread
Rigging
Crane, skates and a route survey for anything that will not roll onto a trailer.
Oil containment
Pans, absorbent and a spill plan before a drain plug is touched.
Bill of sale
A document that clears a lien, a lease or a bankruptcy file, not a handwritten note.
PCB paperwork
Testing and manifesting for pre-1979 oil, handled before the unit moves.
On the ground
The short version
A rewind usually means removing the active assembly, stripping damaged coils and installing new windings and insulation. The shop must also inspect the core, leads, tap connections and clamping structure.
A winding failure confined to insulation presents a different repair scope than an arc that burns core laminations.
Replacement is not automatically simpler. A different transformer may require changes to the pad, primary elbows, secondary bus or protective settings. Compare those installation tasks with the rewind scope, including drying, oil processing and final testing.
Neither path should be selected from a nameplate photograph alone.
Local reality
Why a seller should care
A failed transformer can still contain a usable core and repairable tank, but that conclusion needs evidence. For an owner considering removal in North Carolina, a teardown report helps distinguish a localized coil fault from damage affecting the entire active assembly.
Those distinctions guide a buyer's assessment.
Keep the nameplate, relay event records and maintenance history together before disconnecting the unit. A 12.47 kV primary rating does not establish winding condition, but it identifies the application.
Photographs of bushings, radiators and terminal compartments document missing parts that can complicate inspection or a future rewind.
Around the site
The arithmetic
Start with two work lists rather than one headline comparison. The rewind list includes teardown, core evaluation, coil fabrication, insulation, drying, reassembly and testing. The replacement list includes removal, foundation checks, connection changes and commissioning.
Add outage days, crane mobilizations and temporary power requirements to both lists.
Then check whether the original design still fits the load. Record kVA, primary and secondary voltages, impedance, taps and temperature rise. A rewound coil must meet an engineered specification; changing conductor size alone does not establish capacity.
Core flux, cooling surfaces and dielectric clearances remain design constraints.
Where it sits
Where people go wrong
Owners sometimes treat an acceptable turns ratio as proof that a core deserves reuse. That test checks winding relationships, not every failure mechanism. Shorted laminations, displaced coils and damaged clamping can require separate evaluation.
A through-fault may deform windings even when the tank shows no obvious external damage.
Another mistake is authorizing a rewind before resolving contamination and accessory damage. Oil analysis, applicable PCB records and inspection of the tap changer belong in the scope.
Reusing a cracked bushing or leaving carbon deposits near a lead can undermine new insulation after the transformer returns to service.
On the ground
Value impact
Rewind suitability affects how a buyer evaluates the complete transformer, not just its copper or aluminum windings. An intact core, sound tank and documented failure support a clearer assessment than an unexplained trip followed by outdoor storage.
Preserve inspection access without exposing the active assembly to rain.
A burned core, severe tank distortion or uncertain contamination history can shift attention away from repair and toward material recovery. Missing radiators, bushings or tap hardware also change the assessment.
Do not describe a unit as rewindable solely because the windings can physically be removed from its tank.
Local reality
Your next move
Ask the repair shop for a written scope that separates confirmed damage from assumptions awaiting teardown. Require the proposed winding specification, core inspection method and final test plan.
Review how the shop will verify ratio, winding resistance, impedance and dielectric performance against the agreed requirements for that particular transformer.
If removal is the chosen path, prepare nameplate photographs, dimensions, estimated weight and fluid records for buyer review. Identify crane access, overhead conductors and any lowboy restrictions at the North Carolina site.
Transformer Buyers NC buys used, surplus, failed and obsolete transformers statewide; rewind suitability is one assessment factor.
Get started
Get an offer in minutes
Five fields is all it takes. Photographs help, but a nameplate and a town are enough to start.
No fee, no obligation. We reply the same business day.
Tell us what you have
We reply the same business day.
Questions
Straight answers
Equipment types
Can a transformer be rewound after an internal arc?
Sometimes, but the arc location and resulting damage matter. A shop must inspect the core laminations, tank, leads and insulation supports, not just the burned coil. Carbon contamination and damaged clearances can expand the work beyond winding replacement or make reuse unsuitable.
Service area
Does rewinding change the transformer kVA rating?
Not automatically. Any rating change requires engineering review of the core, conductor, insulation system, impedance and cooling arrangement. Existing radiators and tank surfaces may limit heat rejection. The revised nameplate and test documentation must reflect the approved design rather than an assumed increase.
Payment
What records help a buyer assess rewind suitability?
Provide the nameplate, failure description, relay records, oil analysis and any teardown findings. Include photographs of the tank, bushings, radiators and terminal compartments. A report identifying coil deformation or core damage is more useful than a general statement that the transformer needs rewinding.
Logistics
Value impact: what should a seller know?
Rewind suitability affects how a buyer evaluates the complete transformer, not just its copper or aluminum windings. An intact core, sound tank and documented failure support a clearer assessment than an unexplained trip followed by outdoor storage.