What we buy
Ranges we buy on this page
Potential transformers produce a scaled voltage for metering or relaying. This page covers the identification, inspection and removal details that matter when North Carolina facilities retire these instruments from switchgear, substations or revenue metering points.
Transformer Buyers NC buys used, surplus, failed and obsolete potential transformers, including individual units and assemblies removed with a metering cubicle.
| Phase | kVA | Voltage | Fluid |
|---|---|---|---|
| 1-phase | 0.1 - 5 kVA | 230 kV | Dry or liquid |
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
Potential Transformers explained
A potential transformer, commonly marked PT or VT, reduces primary voltage to a defined secondary voltage for meters and protective relays. A nameplate might show a 7,200:120-volt ratio.
That ratio identifies the intended measurement relationship; it does not establish the unit's insulation rating, accuracy class or usable burden by itself.
Unlike a current transformer, a PT is connected across the circuit being measured. Its secondary supplies voltage signals rather than a proportional current signal. Primary fuses, secondary fuses and terminal markings help identify the arrangement.
A missing fuse drawer or unreadable connection diagram can leave important questions about an otherwise intact unit.
Local reality
The North Carolina install base
Across North Carolina, PTs appear in industrial switchgear, utility substations and revenue metering points. A manufacturing plant may have drawout PT assemblies inside metal-clad gear, while a substation uses separately mounted instruments.
The enclosure, service voltage and mounting arrangement matter more for identification than the facility's industry or county alone.
At a revenue metering point, record which PT served each phase before the equipment is dismantled. Metering drawings and utility identification tags can explain connections that the nameplate cannot.
For a hospital switchgear replacement or an industrial shutdown, keep those records with the removed cubicle rather than separating them during cleanup.
Around the site
The inspection that decides value
The inspection starts with ratio, burden, accuracy class, fuse arrangement and the test certificate. Photograph every nameplate and terminal label, including markings hidden behind a fuse carrier.
Burden and accuracy markings must be read together: a unit's measurement performance depends on the connected load and the conditions stated for its rating.
A test certificate should identify the specific PT, preferably by serial number, and show what was tested. Ratio verification, insulation results and accuracy testing answer different questions.
A certificate from another unit in the same lineup does not establish this unit's condition, especially after a fuse operation or suspected insulation failure.
Where it sits
Fluid condition and PCB status
Many switchgear PTs use cast resin or other dry insulation and have no liquid to sample. Other designs contain insulating fluid. Establish the construction from the nameplate and manufacturer documentation before requesting fluid records.
A molded body, porcelain housing or metal case alone is not enough to settle the question.
For a fluid-filled PT, retain any PCB analysis, fluid identification and leak history with the serial-number record. Age alone does not prove PCB status. Oil around a gasket or terminal requires investigation and containment before handling.
Do not drain an unidentified instrument transformer simply to make its removal easier.
On the ground
Getting it off the pad
For a PT inside switchgear, removal usually begins at the cubicle rather than a concrete pad. Qualified electrical personnel must isolate all primary and secondary sources, verify absence of voltage and apply the required grounding procedures.
A secondary circuit can introduce backfeed; an open primary fuse is not proof of isolation.
PTs can fail quietly, with incorrect or missing voltage signals rather than an obvious tank rupture. A failed PT usually means the whole metering cubicle is replaced.
Before that assembly moves, identify its lifting provisions, secure drawout parts and protect porcelain, fuse carriers and secondary terminals against shifting loads in transit.
Local reality
What a buyer weighs up
A buyer assesses whether the PT is identifiable, complete and documented, not merely whether its case looks clean. Ratio and accuracy class establish its measurement role. Missing primary fuses, cracked resin, chipped porcelain or damaged secondary studs change the assessment.
Photos should show those defects directly rather than only the cubicle door.
Separate confirmed failures from untested units removed during a switchgear upgrade. Relay event records, blown-fuse history and maintenance notes help explain why a PT left service.
Matching serial numbers across photographs and certificates prevents confusion when several similar instruments arrive together, particularly when an entire three-phase metering assembly has been dismantled.
Around the site
The next step for a potential
Prepare a record for each potential transformer with its manufacturer, serial number, ratio, burden and accuracy class. Include the test certificate if it exists, plus clear photographs of the fuse arrangement and mounting hardware.
Identify whether the instrument remains installed, sits in a removed cubicle or has already been separated.
Transformer Buyers NC buys potential transformers anywhere in North Carolina, including failed instruments and obsolete metering assemblies. Provide the site location, access restrictions and available removal records so handling can be evaluated.
Note any fluid, broken porcelain or loose fuse drawers before transport planning; those details affect containment and load protection.
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 you buy a failed potential transformer?
Yes. Transformer Buyers NC buys failed potential transformers as well as used, surplus and obsolete units. Identify the failure if known, such as a blown primary fuse, cracked insulation or incorrect secondary voltage.
Service area
Which potential transformer nameplate details should I record?
Record the manufacturer, serial number, voltage ratio, burden and accuracy class. Photograph the complete nameplate rather than transcribing only the primary voltage. Include terminal markings, the fuse arrangement and any test certificate tied to that serial number so the instrument can be assessed correctly.
Payment
Does every potential transformer need PCB testing?
No. A dry-type PT has no insulating fluid to sample. For a fluid-filled unit, review its identification and existing PCB documentation before determining what further assessment is required.
Logistics
Getting it off the pad: what should a seller know?
For a PT inside switchgear, removal usually begins at the cubicle rather than a concrete pad. Qualified electrical personnel must isolate all primary and secondary sources, verify absence of voltage and apply the required grounding procedures.