What we buy
Ranges we buy on this page
Transformer Buyers NC buys used, surplus, failed and obsolete autotransformers anywhere in North Carolina. This page covers tapped windings, inspection records and removal planning for plant engineers, utility asset managers, facility directors and demolition crews.
From pump station motor starters to transmission substation equipment, identification starts with the nameplate, connection diagram and the actual tap arrangement.
| Phase | kVA | Voltage | Fluid |
|---|---|---|---|
| 3-phase | 5 - 50,000 kVA | 230 kV | Liquid-filled |
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
What a Autotransformers is
An autotransformer uses a single electrically connected winding arrangement, with taps that step voltage up or down. Part of the winding is common to both circuits. Unlike a separate-winding isolation transformer, it has a conductive path between input and output.
The connection diagram shows that relationship more clearly than tank shape.
Large utility autotransformers can have an additional tertiary winding, often connected in delta, without changing the shared connection between the main voltage circuits. Motor-starting units use selected taps to reduce starting voltage.
Neither arrangement makes the main autotransformer connection suitable for a job that requires electrical isolation between input and output.
Local reality
Where Autotransformers turn up in North Carolina
In North Carolina utility substations, autotransformers connect transmission systems operating at different voltage levels. A nameplate showing 230 kV and 115 kV, for example, points to a different removal project than a motor starter inside a plant.
Bushings, cooling banks and station drawings help establish which equipment belongs to the unit.
Large pump stations and industrial motor circuits can contain autotransformer starters that apply reduced voltage during acceleration, then bypass the tapped winding for normal running. Around municipal water facilities and process plants, the starter cabinet, contactor arrangement and motor documentation matter.
A loose winding assembly may not tell the whole story.
Around the site
What we check before we quote
We check the tap configuration, winding condition and ratio at each tap before evaluating an autotransformer. Useful photographs include the nameplate, terminal markings, tap selector and connection diagram.
For a substation unit, the records should distinguish the common winding, series winding and any tertiary terminals rather than simply listing two voltages.
A turns-ratio test should match the documented connections and tap positions. Unexpected readings can indicate an incorrect test setup, a tap contact problem or winding damage. Maintenance files covering through-faults, relay operations and previous repairs help interpret those results.
Burned leads or displaced windings require different handling than a documented surplus unit.
Where it sits
Oil, PCBs and testing
For oil-filled autotransformers, we review oil tests alongside the equipment identification. Dissolved gas results can reveal evidence of overheating or electrical discharge; moisture and dielectric testing describe other aspects of fluid condition.
A laboratory report needs a sample date and unit identifier so it can be tied to the correct tank.
PCB status must come from suitable records or testing, not from the apparent age of a radiator or a replacement gasket. Keep sampling reports, fluid replacement records and any PCB labels with the unit documentation.
A dry-type motor-starting autotransformer has no insulating oil, so this fluid review does not apply.
On the ground
Rigging, weight and transport
A transmission autotransformer may need radiators, bushings or a conservator removed before transport. The lifting plan should use the manufacturer's designated lifting points and distinguish shipping weight from operating weight with oil.
A lowboy route also depends on loaded height, bridge restrictions and the clearance available beneath the station gantry.
At a pump station, the challenge may be extracting an autotransformer starter through a doorway rather than lifting a tank over a substation fence. Confirm cabinet dimensions, winding supports and access for a forklift or crane.
Disconnection, lockout and verification of de-energization belong with qualified personnel before any rigging begins.
Local reality
What moves the number
The equipment assessment depends on voltage relationship, kVA or MVA rating, tap range and documented condition. An intact connection diagram can settle whether a unit fits an autotransformer application.
It cannot be repurposed as an isolation unit, and buyers need to recognize that limitation before considering any potential reuse path.
Missing bushings, damaged tap contacts, a leaking tank and uncertain PCB status change the work required to assess and remove the unit. Access matters too: a clear substation gate differs from a pump station basement.
Complete oil reports and winding test records reduce uncertainty about what is actually sitting on site.
Around the site
When to call us about a autotransformers
Contact is useful when a transmission tie is being replaced, a pump station starter is retired or a failed autotransformer remains on its pad after protection has operated. Early documentation preserves terminal labels and tap settings before dismantling.
We buy these units across North Carolina, including equipment removed during plant closures.
For an initial review, assemble nameplate photographs, the connection diagram, recent oil results where applicable and a description of the removal route. Include whether the autotransformer is still connected, drained or partly dismantled.
Those details help separate an equipment assessment from a rigging problem and identify records needed before pickup planning.
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 an autotransformer provide isolation between voltage circuits?
No. The main input and output circuits share an electrically connected winding, so an autotransformer does not provide galvanic isolation between them. An additional tertiary winding does not remove that shared connection.
Service area
Which tap records help assess a retired autotransformer?
Provide the connection diagram, available tap positions, recorded operating position and turns-ratio results for each tested tap. Identify whether the unit has an off-circuit selector or an on-load tap changer.
Payment
Do motor-starting autotransformers always require oil testing?
No. A dry-type autotransformer starter has no insulating oil to sample. Its assessment instead focuses on winding insulation, tap leads, heat damage and the associated switching arrangement.
Logistics
Oil, PCBs and testing: what should a seller know?
For oil-filled autotransformers, we review oil tests alongside the equipment identification. Dissolved gas results can reveal evidence of overheating or electrical discharge; moisture and dielectric testing describe other aspects of fluid condition.