What we buy
Ranges we buy on this page
A grounding transformer establishes a neutral or ground reference where the electrical system does not provide one. This page covers the nameplate, winding connections, protection records, fluid documentation, and removal details needed to assess a unit in North Carolina.
It is written for plant engineers, generator operators, facility directors, and demolition crews handling grounding equipment on delta systems. We buy used, surplus, failed, and obsolete grounding transformers throughout the state.
| Phase | kVA | Voltage | Fluid |
|---|---|---|---|
| 3-phase | 30 - 2,000 kVA | 34.5 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
Grounding Transformers explained
A grounding transformer's only job is to establish a neutral or ground reference. It does not serve ordinary plant loads.
A zigzag winding arrangement creates a neutral connection on a three-phase system; a grounded-wye and closed-delta arrangement can perform the same grounding function with a different winding construction.
Ground-fault duty separates these units from ordinary distribution transformers. The nameplate may specify neutral current for a short interval rather than continuous load capacity.
A ten-second rating, for example, describes a limited fault duty and must not be treated as permission to carry that current continuously through the neutral.
Local reality
The North Carolina install base
North Carolina industrial plants with delta systems may use grounding transformers beside switchgear, inside electrical rooms, or on outdoor pads. During a plant shutdown, the unit can be overlooked because it supplies no production load.
Its neutral conductor and associated protection drawings identify its role more clearly than its enclosure size.
Mines, data centers, and generator paralleling installations also use grounding transformers where their system design requires a neutral reference. Generator projects need particular attention to breaker positions and bus arrangements.
A unit removed from a paralleling bus should be documented against the operating configuration shown on the site's single-line diagram.
Around the site
The inspection that decides value
Inspection starts with winding configuration, short-time rating, neutral connection, and the relay scheme. Photograph the complete rating plate, not just the manufacturer's name.
Connection diagrams, rated system voltage, neutral current, and duty duration establish what the unit was designed to do and prevent confusion with an auxiliary power transformer.
Relay records help explain why a grounding unit left service. A neutral overcurrent operation, repeated ground faults, or a fault-clearing delay can expose windings to duty beyond their rating.
Include available trip reports and test sheets; a clean enclosure alone does not establish that the zigzag windings survived the event.
Where it sits
Fluid condition and PCB status
Some grounding transformers are dry-type; others have liquid-filled tanks. For a liquid-filled unit, record fluid type, visible leakage, sampling history, and any laboratory PCB determination.
A gasket stain beneath the neutral bushing deserves a close photograph because leakage there can be missed in a general view of the tank.
PCB status must come from documentation appropriate to that specific unit, not an assumption based on size or paint color. Keep laboratory reports, manufacturer records, and any fluid replacement history with the nameplate photographs.
Dry-type grounding units have no insulating-liquid sample, but their winding insulation still needs a condition record.
On the ground
Getting it off the pad
Before removal, qualified site personnel must isolate the grounding transformer, verify absence of voltage, and address stored or induced energy under the site's electrical safety procedure. Disconnecting the neutral while its bus remains energized can change system grounding and protection behavior.
Removal therefore starts with an approved switching plan, not rigging.
These units are often small beside the switchgear they protect, but enclosure size is not a lifting specification. Confirm shipping weight, lifting points, base fasteners, and the route off the pad.
Protect the neutral bushing during rigging, and keep any separate neutral grounding resistor identified rather than treating it as loose scrap.
Local reality
What a buyer weighs up
The rating plate is the decisive source for identifying a grounding transformer and its intended duty. Small physical size does not reduce the importance of its grounding function.
Without readable voltage, winding configuration, neutral rating, and duration, enclosure photographs cannot establish whether a removed unit fits a particular grounding application.
Condition assessment then separates intact surplus equipment from a failed grounding unit. Burned insulation, displaced connections, cracked bushings, and evidence of tank pressure need clear documentation. We also review missing accessories and removal damage.
A detached neutral lead or unreadable connection diagram can complicate identification even when the core appears undisturbed.
Around the site
The next step for a grounding
Prepare a record with the North Carolina site location, nameplate photographs, connection diagram, and reason for removal. Include the neutral grounding resistor details if one was connected, along with relay settings and available fault records.
Identify whether the transformer remains connected to a delta bus or has already been isolated.
For pickup planning, describe pad access, doorway clearance, lifting provisions, and whether insulating liquid remains in the tank. Distinguish the grounding transformer from neighboring switchgear and resistor cabinets in photographs.
We buy these units across North Carolina, including failed equipment, with the identification and handling requirements reviewed before removal is arranged.
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 assess a grounding transformer without its nameplate?
Assessment is limited without the rating plate. Manufacturer drawings or traceable test records may recover the winding configuration, voltage, neutral current, and short-time duty. An enclosure photograph alone cannot establish those ratings, especially when a zigzag unit resembles other equipment in the electrical room.
Service area
Should the neutral grounding resistor stay with the transformer?
Document the resistor and its connection before either component is disconnected. Record its nameplate, resistance, current rating, and duty duration where shown.
Payment
Do you buy grounding transformers after a ground fault?
Yes, we buy failed grounding transformers as well as used and surplus units. Provide the fault report, relay trip information, nameplate, and photographs of damaged bushings or winding connections. State whether the fault-clearing time exceeded the unit's short-time rating if that information is documented.
Logistics
Getting it off the pad: what should a seller know?
Before removal, qualified site personnel must isolate the grounding transformer, verify absence of voltage, and address stored or induced energy under the site's electrical safety procedure. Disconnecting the neutral while its bus remains energized can change system grounding and protection behavior.