A 3,000 kVA transformer sits in the range used for substantial building service, industrial distribution and renewable-energy collection systems. At this size, the same capacity can arrive as a compartmentalized pad-mount, a substation transformer with exposed connection arrangements, or the transformer section of a unit substation. Those differences matter when matching equipment to another application.
If you want to sell 3,000 kVA transformer equipment, start with the actual nameplate rather than a project schedule or asset-list description. We buy this size across Virginia and review equipment in neighboring states and nationwide on request. Our transformer size guide helps distinguish nearby ratings when a facility has several similar-looking units.
01What the 3,000 kVA rating tells a buyer
A 3,000 kVA rating equals 3 MVA of apparent power. It describes transformer capacity under the conditions stated on the nameplate, not the real-power demand of the connected facility. Actual kilowatts depend on load power factor, and the rating alone does not establish suitability for a particular installation.
We pay attention to whether 3,000 kVA is the base rating or a fan-assisted rating. A liquid-filled unit may list separate ONAN and ONAF capacities: natural oil circulation with natural air cooling, followed by forced-air cooling. Photograph every rating line and any separate cooling plate so a higher fan-cooled rating is not mistaken for the base capacity.
02Pad-mount, substation and unit substation forms
Three-phase pad-mount transformers at 3,000 kVA typically have enclosed high- and low-voltage connection compartments. Send views of the doors, compartment arrangement and exterior labels. Dead-front versus live-front construction, loop-feed versus radial-feed arrangement, and the low-voltage terminal layout all affect compatibility with a replacement application.
For substation transformers, show the bushings, terminal chambers, radiators and any attached cable boxes. For unit substation equipment, identify whether the sale includes only the transformer or also the primary switch and secondary switchgear. We buy oil-filled, dry-type and cast resin equipment; the construction and included components need to be clear.
- Photograph the full transformer from more than one side.
- Identify attached switchgear separately from the transformer rating.
- Show terminal interfaces without opening energized compartments.
- Note missing fans, doors, gauges, bushings or connection hardware.
Full-load amps for a 3,000 kVA 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 | 8,327 |
| 240 V | 7,217 |
| 480 V | 3,608 |
| 600 V | 2,887 |
| 2,400 V | 722 |
| 4,160 V | 416 |
| 12,470 V | 139 |
| 13,200 V | 131 |
| 13,800 V | 126 |
| 23,000 V | 75.3 |
| 34,500 V | 50.2 |
03Voltage combinations and full-load current
A 3,000 kVA service transformer may have a medium-voltage primary such as 12,470, 13,200 or 13,800 volts and a 480Y/277-volt secondary. Renewable-energy applications may use other low-voltage ratings matched to inverter equipment. A marking such as 12470GrdY/7200 describes a grounded-wye voltage arrangement; copy the complete marking rather than reducing it to a single number.
For three-phase full-load current, use I = kVA × 1,000 ÷ (√3 × line-to-line volts). At 3,000 kVA and 480 volts, that gives 3,000 × 1,000 ÷ (√3 × 480), or approximately 3,608 amps. Refer to the amp table on this page for other voltages and the kVA and full-load amps guide for context. Full-load current is not a breaker-setting recommendation.
04Nameplate details that establish equipment fit
A readable nameplate lets us distinguish a usable match from a transformer that only shares the same capacity. Send the manufacturer, serial number, manufacture date, three-phase rating, frequency, high- and low-voltage ratings, tap positions, impedance and winding connection. Include the connection diagram and any listed IEEE C57 standard designation without cropping the plate.
For liquid-filled units, show the fluid type, fluid quantity, cooling class and total weight when listed. Mineral oil and FR3 natural ester are different insulating fluids, so do not describe both simply as oil if the plate identifies the fluid. PCB status must be disclosed and documented. Existing test reports can add useful condition information, especially after storage, a fault or an extended shutdown.
05Physical size, loading access and buyer demand
There is no single footprint or shipping weight for every 3,000 kVA transformer. Tank construction, fluid volume, temperature-rise design, radiators, enclosures and attached switchgear change the dimensions and weight. Send measured overall length, width and height when available, plus the nameplate weight. Identify removable accessories separately; do not assume they can be removed for transport without appropriate review.
Tell us whether the unit is indoors, on a concrete pad, behind a fence or connected to a larger assembly. Photos of the access route, overhead obstructions and loading area help define freight and loading terms. Data centers, industrial facilities, and solar and battery-storage projects can use this capacity, but demand depends on voltage match, impedance, configuration and condition, not simply the 3 MVA label.
06What to send for a 3,000 kVA transformer offer
Send clear nameplate and overall photos, location, quantity and condition notes. We review 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 you, and payment follows those terms. See how the purchase process works for details.
When you are ready to sell 3,000 kVA transformer equipment, send the equipment details for an offer. Tell us whether it is operating, disconnected, stored or failed, and whether connected equipment is included. We do not perform electrical disconnect work or ask you to drain fluid. Use your own qualified electricians to de-energize and disconnect the equipment.
Frequently asked questions
Is a 3 MVA transformer the same size as a 3,000 kVA transformer?
Yes, 3 MVA and 3,000 kVA express the same apparent-power capacity. Check which cooling condition applies to that rating, because one nameplate can list multiple capacities. Virginia Transformer Buyers needs the complete plate to confirm whether 3 MVA is the base rating, a fan-assisted rating or another stated operating rating.
Can I sell a 3,000 kVA transformer with a 480Y/277 secondary?
Yes, Virginia Transformer Buyers buys 3,000 kVA transformers with a 480Y/277-volt secondary. Send the primary voltage, winding connection, impedance, tap range and terminal arrangement along with the capacity. The secondary voltage alone does not establish a match, particularly when comparing pad-mount equipment with a transformer connected directly to low-voltage switchgear.
Do you buy 3,000 kVA solar or battery-storage transformers?
Yes, we buy 3,000 kVA transformers from solar and battery-storage installations. Send both winding voltages, the connection diagram, impedance and any application-specific nameplate notes. Include condition details and existing test data if available. Describe the transformer separately from inverters, battery equipment or switchgear so the equipment offered for sale is clear.
What if my transformer lists both 3,000 and 3,750 kVA?
Send the entire nameplate because those figures may represent different cooling ratings on the same transformer. For example, a unit can have a lower natural-air rating and a higher forced-air rating. Include photos of fans and controls, and identify missing components. Our 3,750 kVA transformer page covers equipment carrying that capacity.
Can you buy a failed 3,000 kVA transformer?
Failed 3,000 kVA transformers are reviewed case by case. Describe the failure, visible damage, leaks and any available test findings without opening energized equipment. Include complete nameplate photos and disclose and document PCB status. Do not drain the fluid for the sale; Virginia Transformer Buyers does not ask sellers to do that.
Can I sell just the transformer from a 3,000 kVA unit substation?
Yes, you can offer the transformer section without offering the entire unit substation. Identify what remains attached and photograph its primary and secondary connection interfaces. State whether transition sections, terminal chambers or switchgear are included. Your qualified electricians handle de-energizing and electrical disconnection; Virginia Transformer Buyers does not perform that work.