A 750 kVA three-phase transformer can serve industrial plant loads, big-box retail buildings, individual data hall loads or solar inverter applications. Those uses do not make every unit interchangeable. A grounded-wye secondary, enclosure configuration or cooling designation can determine whether a transformer suits another installation.
We buy 750 kVA transformers of all brands across Virginia. If you want to sell 750 kVA transformer equipment, start with the complete nameplate rather than a size estimate from the enclosure. Our transformer size guide covers other ratings, but this page focuses on the details that distinguish a 750 kVA unit.
01What the 750 kVA Rating Actually Means
The 750 kVA rating describes apparent power capacity under the transformer’s stated operating conditions. It is not a fixed 750 kW output: real power depends on load power factor. The rating also does not identify primary voltage, secondary voltage or physical dimensions. We read those fields separately because two transformers with the same kVA can serve very different systems.
Check whether 750 kVA is the base rating or one step in a multiple-rating cooling arrangement. On liquid-filled equipment, ONAN identifies natural oil and natural air cooling; ONAF adds forced-air cooling. If the plate shows multiple ratings, send the entire rating block and photos of any fans. Do not describe a higher fan-assisted rating as available without noting the cooling equipment and its condition.
02Common 750 kVA Transformer Configurations
We buy three-phase pad-mount transformers rated 750 kVA, including equipment with different primary termination arrangements. Photos should show the exterior, compartment layout where safely accessible, and any existing views of bushings and terminals. Loop-feed versus radial-feed construction, dead-front versus live-front connections, and protective devices are important distinctions, not minor cabinet details.
We also buy unit substation transformers and cast resin transformers at this rating. For a unit substation, identify whether the transformer is offered alone or with attached switchgear and transition sections. For cast resin equipment, show the coils, enclosure and terminal arrangement using existing safe access. Cracking, contamination or damaged supports should be clearly described.
Full-load amps for a 750 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 | 2,082 |
| 240 V | 1,804 |
| 480 V | 902 |
| 600 V | 722 |
| 2,400 V | 180 |
| 4,160 V | 104 |
| 12,470 V | 34.7 |
| 13,200 V | 32.8 |
| 13,800 V | 31.4 |
| 23,000 V | 18.8 |
| 34,500 V | 12.6 |
03Voltage Combinations and Full-Load Current
A familiar 750 kVA distribution configuration is a 12.47 kV-class primary with a 480Y/277 V secondary. Other units may have 13.2 kV or 13.8 kV primaries, or a 208Y/120 V secondary. Read the exact marking: a plate showing 12470GrdY/7200 conveys connection information that a shorthand description of “12 kV” loses. Solar inverter transformers may have application-specific voltages that must be copied exactly.
Use the amp table on this page to compare current at different voltages. For one worked example, three-phase full-load current is I = kVA × 1,000 ÷ (√3 × line-to-line volts), so 750 × 1,000 ÷ (√3 × 480) is approximately 902 A. That is rated-current arithmetic, not a measurement of the existing load or a protective-device recommendation. See the kVA and full-load amps guide for context.
04How to Confirm 750 kVA on the Nameplate
Find the field labeled kVA, rated power or capacity, and confirm that the plate identifies a three-phase transformer. Photograph the plate straight on, with enough resolution to read small text. A cabinet stencil or asset label can be useful, but it does not replace the manufacturer’s rating plate.
We pay attention to the complete electrical and construction record, not just the large capacity number. Include the fields below when visible. If the plate is missing or unreadable, send any manufacturer drawings or equipment records you already have; do not guess the rating from cabinet dimensions.
- Manufacturer, model or type, serial number and manufacture date
- Rated kVA, phase, frequency, primary and secondary voltages
- Winding connections, tap positions and percent impedance
- Cooling class, temperature rise and any multiple capacity ratings
- Fluid type, fluid volume, total weight and PCB labeling where shown
05Dimensions, Weight and Site Access Matter
There is no single shipping size or weight for a 750 kVA transformer. Liquid-filled pad-mount units include a tank, fluid and terminal compartments; cast resin assemblies have different enclosure and coil arrangements. A unit substation may include attached sections that change the transport envelope. Use the nameplate weight or manufacturer documentation rather than a generic estimate.
Send overall height, width and depth when available, along with photos showing the route out of the site. Doorways, overhead obstructions, loading access and attached equipment can affect freight and loading terms. We do not perform electrical disconnect work. Your qualified electrician must de-energize and disconnect the equipment; do not open energized compartments for photos, and do not drain fluid for a sale.
06What Drives Buyer Interest in This Size
Buyer interest in a 750 kVA transformer depends on matching a specific electrical requirement. Industrial plants and large retail properties may need conventional distribution voltages, while data hall and solar applications can require different connections or secondary voltages. Usable condition, complete components and readable documentation help establish whether a unit fits. The rating alone does not establish its value.
A 750 kVA unit falls between 500 kVA equipment and 1,000 kVA transformers, but it is not automatically a substitute for either. Capacity, impedance, voltage and installation requirements still matter. We buy used and new-surplus units; failed or damaged units are reviewed case by case, with the fault history and visible damage disclosed.
07What We Need to Make a Written Offer
Send a clear nameplate photo, overall photos, location, quantity and condition notes. We review the equipment and may ask about PCB status, available test data or site access. PCB status must be disclosed and documented. If the equipment fits, we send a written offer specifying price, freight, loading and payment terms, then schedule pickup with you; payment follows those terms. Our selling process explains the details.
Ready to sell 750 kVA transformer equipment? Use the equipment offer form and identify whether the unit is still connected, disconnected or stored. Include known missing parts and whether switchgear, fans or transition sections are included so the offer covers the equipment you actually intend to sell.
Frequently asked questions
Is a 750 kVA transformer the same as a 750 kW transformer?
No. A 750 kVA transformer has an apparent-power rating, while kW describes real power. The relationship depends on load power factor and operating conditions. Virginia Transformer Buyers uses the nameplate kVA rating to identify capacity, then reads voltage, phase and cooling information separately. Do not relabel a unit based on the connected load’s kW.
Can I sell a 750 kVA transformer with a 208Y/120 V secondary?
Yes. Virginia Transformer Buyers buys 750 kVA three-phase transformers with different voltage configurations, including units marked 208Y/120 V. Send the exact primary and secondary markings rather than describing the unit only as low voltage. Winding connections, impedance, taps and construction help distinguish it from a 480Y/277 V unit of the same capacity.
My transformer has several kVA ratings. Which one should I report?
Report every kVA rating shown on the nameplate, along with the corresponding cooling designations. A multiple-rated transformer may reach its higher rating only with specified cooling equipment operating. Virginia Transformer Buyers needs the complete rating block and the condition of fans or other cooling components, not just the largest number on the plate.
Can I sell the 750 kVA transformer without its substation switchgear?
Yes, you can offer the transformer separately, but clearly identify what remains attached and what is excluded. Virginia Transformer Buyers buys unit substation transformers as well as other configurations. Photos of flanges, terminal connections and transition sections help define the sale. Your qualified electricians handle de-energizing and disconnecting the equipment.
Does FR3 fluid change how I should describe my 750 kVA transformer?
Yes. Identify FR3 natural ester fluid if the nameplate or equipment records document it, rather than calling every liquid-filled transformer mineral-oil filled. Include records of any known fluid replacement because an original plate may not describe the current fill. Virginia Transformer Buyers requires PCB status to be disclosed and documented separately.
Will you review a failed 750 kVA cast resin transformer?
Yes. Virginia Transformer Buyers reviews failed 750 kVA cast resin transformers case by case. Describe the failure, affected phase if known, visible coil damage and any missing components. Existing test reports or maintenance records can help explain the condition. Do not energize the transformer or arrange new testing solely to photograph it for a sale.