A 10 MVA transformer sits in the range used for utility distribution substations, large industrial plants and solar projects. At this capacity, winding voltages, cooling ratings and accessory condition matter just as much as the headline MVA number. We buy these units from sellers throughout Virginia.
If you want to sell 10 MVA transformer equipment, start with the complete rating plate rather than a project drawing or inventory description. We buy both substation transformers and power transformers, including units removed during upgrades, plant closures or project changes.
01What a 10 MVA Transformer Rating Means
Ten MVA equals 10,000 kVA of apparent power. For a three-phase transformer, that rating describes the total three-phase capacity, not the capacity of each phase. It does not automatically mean 10 MW of usable real power; real power depends on the connected load's power factor.
Cooling stages can change the capacity shown on the plate. A unit marked 7.5/10 MVA ONAN/ONAF has a 7.5 MVA natural-cooling rating and a 10 MVA forced-air rating. A unit with 10 MVA as its base rating is different. Include every listed stage so we know which rating depends on operating fans.
The distinction also matters when comparing nearby sizes. A fan-cooled 7.5 MVA transformer may carry a 10 MVA upper rating, but it should not be described as 10 MVA at every cooling stage.
02Voltage Combinations and Full-Load Current
Voltage combinations at this size vary by application. Examples include 69 kV to 13.8 kV for distribution service, 34.5 kV to 13.8 kV for plant distribution, and 34.5 kV to 480Y/277 V for suitable low-voltage applications. These examples are not interchangeable specifications; the actual winding ratings and connections control.
Copy the voltage notation exactly. A plate reading 12470GrdY/7200 identifies a grounded-wye winding with line-to-line and line-to-neutral values. Also photograph the tap range, frequency, impedance percentage and winding diagram. A solar-project transformer may have requirements that differ from an industrial step-down unit even at the same MVA.
Use the amp table on this page to compare current at different voltages. For one example, three-phase full-load current at 13,800 V is I = 10,000,000 VA ÷ (√3 × 13,800 V), or approximately 418 A. The kVA and full-load amps guide explains the calculation; current alone does not establish equipment compatibility.
Full-load amps for a 10 MVA three-phase transformer
The amp table on this page uses the standard formula Amps = kVA × 1,000 ÷ (1.732 × line-to-line volts). Match the voltage on your nameplate to read the rated full-load current of each winding.
| Winding voltage | Full-load amps |
|---|---|
| 208 V | 27,757 |
| 240 V | 24,056 |
| 480 V | 12,028 |
| 600 V | 9,623 |
| 2,400 V | 2,406 |
| 4,160 V | 1,388 |
| 12,470 V | 463 |
| 13,200 V | 437 |
| 13,800 V | 418 |
| 23,000 V | 251 |
| 34,500 V | 167 |
03Confirm the Size on the Complete Nameplate
We pay attention to the full rating plate, including information below the largest printed capacity. Look for 10 MVA, 10,000 kVA or a multiple-stage rating that includes that value. If the plate is dirty or difficult to read, send several close-ups without removing or altering it.
Photograph separate accessory plates when available. Load tap changers, cooling equipment and fluid labels can carry information missing from the main plate. If an inventory record disagrees with the nameplate, include both and identify the discrepancy rather than choosing the larger number.
- Manufacturer, serial number and manufacturing date, if shown
- Three-phase capacity at each cooling stage
- High- and low-voltage ratings, connections and tap positions
- Frequency, impedance and listed temperature rise
- Total weight, fluid quantity and fluid type, if listed
- Any listed IEEE C57 designation and separate tap-changer identification
04Physical Size, Weight and Site Access
There is no single footprint or shipping weight for a 10 MVA transformer. Voltage class, insulation clearances, tank design, cooling arrangement and accessories all affect dimensions. Radiators, conservators and bushings can extend well beyond the main tank, so tank measurements alone may understate transport requirements.
Send overall height, width and length when available, along with the listed weight and photographs of the surrounding area. Distinguish operating weight from any documented shipping weight. Show gates, overhead obstructions, the foundation and the route between the transformer and the loading area.
Do not assume accessories can be removed or that fluid must be drained for shipment. We do not ask sellers to drain fluid. Freight and loading responsibilities belong in the written offer, and sellers use their own qualified electricians to de-energize and disconnect the equipment.
05What Makes a 10 MVA Unit a Useful Match
Demand for a particular 10 MVA unit depends on its specifications, not capacity alone. Utility substations, industrial distribution systems and solar projects have different voltage, protection and operating requirements. A usable voltage combination and documented condition help identify an application; the size by itself does not guarantee an offer.
We buy all brands, including Siemens transformers, without requiring a particular manufacturer. We are an independent buyer, not affiliated with any manufacturer, including Virginia Transformer Corp of Roanoke. Brand names identify the equipment only.
Tell us whether the unit was operating before removal, how it has been stored and whether accessories remain attached. Missing bushings, damaged radiators or an incomplete tap changer are important details. We review failed or damaged units case by case rather than treating them like serviceable surplus.
06Information We Need for a Written Offer
Send a clear nameplate photo, overall photos, location, quantity and condition notes. We review the information and may ask about PCB status, available test data or site access. If the equipment fits, we send a written offer covering price, freight, loading and payment terms; pickup is scheduled with you, and payment follows those terms. See how the buying process works for details.
For a 10 MVA unit, include existing oil-analysis results, electrical test reports and maintenance records if available. Identify mineral oil or FR3 natural ester from documentation rather than appearance. PCB status must be disclosed and documented; a fluid label alone should not be treated as a complete PCB record.
Ready to sell 10 MVA transformer equipment? Send your equipment details with photos showing the full transformer and each side of the cooling system. Note anything missing, leaking or damaged so the review starts with an accurate description.
Frequently asked questions
Is a 10,000 kVA transformer the same size as a 10 MVA transformer?
Yes, 10,000 kVA equals 10 MVA. Check whether that number is the base rating or a higher cooling-stage rating. Virginia Transformer Buyers needs the complete plate because a multi-rated transformer may reach 10 MVA only with forced-air cooling. Include the ONAN/ONAF markings and all capacity values.
Can I sell a 7.5/10 MVA transformer as a 10 MVA unit?
You can offer it with its full 7.5/10 MVA rating, but do not omit the lower stage. Virginia Transformer Buyers buys multi-rated units and needs to know which capacity corresponds to each cooling class. Photograph the fans and controls, and disclose whether they are present and known to operate.
Do you buy 10 MVA transformers removed from solar projects?
Yes, Virginia Transformer Buyers buys solar-project transformers, including three-phase 10 MVA units. Send the winding voltages, connection diagram, cooling ratings and condition details. Identify whether the transformer was energized, remained new surplus or was removed after service, and include any project-specific specifications available with the equipment.
Can you quote a 10 MVA transformer without its shipping weight?
Send the equipment information even if shipping weight is unavailable, but weight and dimensions may need clarification before freight and loading terms can be finalized. Virginia Transformer Buyers needs photographs of the complete unit and site access. Include existing drawings or manufacturer records rather than estimating weight from MVA alone.
Will you buy a 10 MVA transformer with a failed winding?
Virginia Transformer Buyers reviews transformers with failed windings case by case. Describe the known failure and provide existing test reports, fault notes and photographs of any visible damage. Disclose leaks, missing components and documented PCB status. Do not describe the unit as operational or drain its fluid before submitting it.