A Delta Star transformer may be a spare power unit, a retired substation asset or part of a mobile assembly. We buy surplus and used units from sellers throughout Virginia. For this equipment, the distinction between a standalone transformer and a complete mobile substation matters: the available components, electrical ratings and transport configuration need to be clear.
Delta Star designs and builds power transformers and mobile substations and is headquartered in Lynchburg, Virginia. We are an independent buyer, not affiliated with Delta Star or any other manufacturer. Names on our transformer brand pages identify equipment only; they do not imply a manufacturer relationship.
01Delta Star Power, Substation and Mobile Equipment
We buy Delta Star power and substation transformers, whether they are new surplus, used spares or decommissioned units. A warehouse spare and a transformer removed after years of service need different condition notes, but both start with the same essentials: identification, electrical ratings and a clear description of what is included.
For larger power transformers, send every rated cooling stage rather than only the largest MVA figure. An ONAN/ONAF nameplate identifies natural-oil, natural-air cooling and natural-oil, forced-air cooling stages. Include photos of radiators, fans, bushings and control cabinets so the configuration is visible.
For mobile equipment, identify whether you are selling the transformer alone, the transformer mounted on its trailer or a complete mobile substation. List included switchgear, breakers, cables, grounding equipment and auxiliary components. Do not assume that everything visible in a yard photo belongs to the sale.
02Identify the Unit by Nameplate, Serial Number and Year
The Delta Star nameplate should be readable edge to edge. We pay attention to the serial number, manufacturing year, rated kVA or MVA, phase, frequency, winding voltages and cooling designation. If several transformers look alike, label each photo set with its serial number so records do not get mixed.
Copy voltages exactly as shown, including winding connections. A rating such as 12470GrdY/7200 or 480Y/277 carries more information than a rounded voltage description. Include impedance, tap ranges, winding connection diagrams and any separate tap-changer identification plate.
Photograph secondary plates and shipping information as well as the main plate. Total weight, oil quantity and shipping configuration help distinguish operating weight from the load that may actually move. Our nameplate reading guide explains the fields to capture when a plate is crowded or weathered.
- Main nameplate with serial number and year readable
- All MVA ratings and corresponding cooling stages
- High-, low- and tertiary-winding ratings, where present
- Tap-changer plate and available position information
- Total weight, fluid quantity and shipping-weight markings
- Overall photos showing all sides and installed accessories
03What Matters Beyond the Delta Star Name
When you want to sell Delta Star transformer equipment, the brand is only part of the description. We pay attention to winding ratings, impedance, tap arrangement, cooling equipment and physical condition. These details distinguish otherwise similar units and help establish what equipment is actually available.
Explain whether the transformer was operating when removed, held as a spare or taken out of service following a fault. Share available maintenance records, oil analysis, electrical test reports and any known repair history. Identify missing bushings, detached radiators, damaged cabinets or disconnected accessories rather than describing an incomplete unit simply as used.
Fluid type and PCB status need clear documentation. If records identify mineral oil or FR3 natural ester, include them; do not infer the fluid from appearance or age. PCB status must be disclosed and documented. We do not ask sellers to drain fluid, and failed or damaged units are evaluated case by case.
04Mobile Transformers Need a Complete Equipment Inventory
A mobile transformer listing should describe both the electrical equipment and its transport arrangement. Send photos showing the transformer mounting, trailer identification, wheels, support points and any separate accessory loads. Note whether the assembly has remained intact or whether components were removed for storage.
For a complete mobile substation, provide an inventory tied to photos or drawings. Transformer ratings alone do not describe the associated breakers, disconnects, protection panels or cable connections. State which components are included and which belong to the site or another owner.
Tell us about access restrictions, storage conditions and known trailer defects. Do not assume a trailer is road-ready because the transformer was originally mobile. Freight and loading responsibilities belong in the written offer, with the actual equipment configuration and site conditions made clear.
05Virginia Sources: Utility Spares, Plant Replacements and Projects
Virginia sellers may have Delta Star equipment following a utility substation upgrade, an industrial plant replacement, a project cancellation or a spare-equipment inventory change. Tell us why the unit is available. A canceled installation may have storage records but no operating history; a retired operating unit may have maintenance records and a documented removal reason.
For substation transformers still at a plant or utility site, describe the surrounding equipment and loading access. Useful photos show gates, nearby structures, overhead obstructions and the path from the transformer to the loading area. Sellers must use their own qualified electricians to de-energize and disconnect equipment; we do not perform that work.
We serve every region of Virginia and also evaluate equipment in neighboring states and nationwide on request. A Delta Star unit does not need to be located near Lynchburg to be relevant. Send its actual location, not the manufacturer's address or the former project location.
06Prepare a Clear Delta Star Equipment Submission
Keep the initial submission focused on the asset. Combine the main nameplate, overall photos, serial number, location, quantity and condition notes in one equipment package. For multiple units, create a separate entry for each transformer and identify shared accessories.
We examine the information and may ask about PCB documentation, test data or site access. If the equipment fits, we send a written offer specifying price, freight, loading and payment terms; pickup is scheduled with the seller, and payment follows those terms. See how the purchase process works for details.
Ready to sell Delta Star transformer equipment? Use the equipment offer form and include the nameplate first. For a mobile assembly, add an inventory so the submission clearly distinguishes the transformer from the rest of the package.
Frequently asked questions
Can I sell a Delta Star transformer without its original drawings?
Yes, you can submit a Delta Star transformer without original drawings. Send a readable nameplate and detailed photos of the unit, connections and accessories. Drawings can help clarify winding arrangements, dimensions and included equipment, especially for mobile assemblies, but tell us what documentation is actually available rather than delaying the submission.
Do you buy a Delta Star mobile transformer without the trailer?
We buy power transformers offered separately from their mobile assemblies. Clearly state that the trailer is excluded and show the transformer's current mounting and condition. Include available weight and dimensional information, plus a list of accessories that stay with the transformer. The written offer will specify freight and loading terms for the equipment being sold.
Which MVA rating should I send for a Delta Star ONAN/ONAF transformer?
Send every MVA rating shown on the Delta Star nameplate, together with its cooling designation. The ONAN rating and forced-air ratings describe different cooling stages, not interchangeable labels. Photograph the full rating table and installed fans and radiators. Note missing or damaged cooling components so the listed ratings are not mistaken for a complete equipment description.
Can I sell a Delta Star transformer that tripped or failed?
Failed Delta Star transformers are evaluated case by case. Describe the trip or failure, whether the cause is known, and any visible damage or testing completed afterward. Include available reports and disclose documented PCB status. Do not describe the unit as operational solely because its tank and bushings appear intact.
Does an older Delta Star transformer need PCB documentation?
PCB status must be disclosed and documented for an older Delta Star transformer, just as it must for other fluid-filled equipment submitted to us. A manufacturing year alone is not a substitute for documentation. Send available fluid records or test reports and identify gaps. We do not provide environmental advice or ask sellers to drain the transformer.
Are you Delta Star or affiliated with its Lynchburg factory?
No, Virginia Transformer Buyers is an independent equipment buyer and is not affiliated with Delta Star or its Lynchburg operations. We use the Delta Star name only to describe transformers offered by sellers. We are also not affiliated with Virginia Transformer Corp, which is a separate manufacturer.