Virginia Transformer Corp Pad-mounted oil-filled transformers (to 10 MVA)

Virginia Transformer pad-mounts to 10 MVA and 35 kV with 200 kV BIL, from the largest US-owned maker

Virginia Transformer Corp Pad-mounted oil-filled transformers (to 10 MVA) is one of 32 data center transformers tracked in the SecondWatt catalogue, each with specifications, lead times and indicative secondary-market pricing.

Virginia Transformer pad-mount dossier: to 10 MVA and 35 kV with 200 kV BIL, FR3 options, 27-unit surplus block, expansion news, inspection checklist.

Virginia Transformer Corp, founded 1971 in Roanoke, Virginia, calls itself the largest US-owned transformer manufacturer in North America, running plants in Roanoke, Troutville, Pocatello, two in Chihuahua, and the expanding Georgia Transformer site at Rincon, Georgia, for 667,000 combined sq ft and 67,000 MVA of annual capacity with 400+ engineers. Company capability claims reach 1,400 MVA at 500 kV class across core-type, shell-type, and dry-type lines. The pad-mount line runs to 10 MVA with high voltage to 35 kV delta or wye and BIL to 200 kV, the highest BIL ceiling in the class, in dead-front or live-front builds with loop or radial feed, step-up or step-down duty, mineral oil or FR3, 55/65/75 C rise options, 3-legged stacked cores, and aluminum or copper windings. VTC-badged secondary supply exists at scale but unpriced: 27 units of 3,900/4,400 kVA pad-mounts sat on Surplus Record price-on-request, plus an unused 2019 20/33 MVA substation unit. Corporate signals run hot: a 6 billion USD sale exploration reported January 2025 and a Rincon expansion adding 50% capacity with 400 jobs, groundbreaking April 2026.

Why it matters

VTC's shortest-lead-times positioning and 50% capacity expansion make it the US-owned counterweight to import dependence, and its 6 billion USD valuation exploration prices what transformer capacity is worth in this market. For buyers, 27 same-model surplus units in one listing is the rare chance to standardize a campus on identical hardware.

Who buys it

Utilities, renewable developers (GSU pad-mount variants), and data center EPCs buy VTC pad-mounts, with the 200 kV BIL and 35 kV class suiting harsh-system campuses. The 27-unit used block on Surplus Record points at project-surplus liquidations as the main secondary source for the brand.

Role in the data center

Campus pad-mount distribution at 2,000-10,000 kVA with headroom BIL, including GSU pad-mount duty for on-site generation blocks.

Key specifications

Technical summary

Pad-mounts: up to 10 MVA HV: up to 35 kV delta or wye BIL: up to 200 kV Builds: dead-front or live-front; loop or radial feed Duty: step-up or step-down Fluids: mineral oil or FR3; rise 55/65/75 C Core: 3-legged stacked; aluminum or copper windings Certifications: CSA, IEC, UL optional Variants: utility pad-mount, E2X hardened build, GSU pad-mount for renewable step-up Company capacity: 67,000 MVA/year across 6 plants

Pricing and availability

Comparable secondary-market band: 4950–104000 $ per unit. Trend: up Lead time, new: 40-65 weeks (pad-mount class); company markets shortest-lead-time positioning. Lead time, used or refurbished: 1-8 weeks. Warranty, used: 3-year typical from major US rebuilders.

Lifecycle and maintenance

Liquid-filled transformers routinely serve 30-40 years with annual oil screening, DGA on a 1-2 year cadence (or continuous online monitoring on critical units), and gasket or bushing service as tests dictate. Major US rebuilders remanufacture units to like-new condition with warranties up to 3 years (T&R Electric, Sunbelt Solomon), and reconditioned stock ships in days against 65-210 week new-build queues. Remaining paper life, estimated by furan testing, governs end-of-life valuation.

Common failure points

• Bushings — Moisture ingress and partial discharge leading to flashover or tank rupture
• Gaskets and seals — Oil seepage at bushings, valves, and radiator headers
• Tap changer — Contact wear and mechanism faults; leading maintenance component in fleet surveys
• Winding insulation — Dielectric failure, the most common failure mode in CIGRE TB 642 data
• Tank corrosion — Base and cabinet rust on pad-mounted units
• Moisture in oil — Reduced dielectric strength and accelerated paper aging

Inspection checklist

Oil quality — dielectric breakdown, moisture, and acidity tests; verify PCB content documented below 2 ppm on older units DGA — dissolved gas analysis per IEEE C57.104; investigate any combustible-gas trend rise between 2 consecutive samples Insulation resistance — megger HV/LV/ground; polarization index of 2.0 or higher passes Turns ratio — TTR on all tap positions; deviation beyond 0.5% from nameplate fails Winding resistance — verify three-phase balance within 2% between phases Bushings and wells — inspect for cracks, tracking, and oil weep; replace suspect bushing wells before energization Gaskets and seals — inspect bushings, valves, and radiator headers; oil seepage is the top pad-mount defect Tank and cabinet — corrosion survey at base and sills; enclosure integrity per IEEE C57.12.28 class requirements Fusing and switches — inspect Bay-O-Net or current-limiting fuses and loadbreak switch function where fitted Tap changer — exercise the de-energized tap changer through all 5 positions; verify contact condition Nameplate verification — confirm kVA, impedance, BIL, and DOE 10 CFR 431 efficiency vintage against the test report Accessories — verify oil level, temperature, and pressure gauges plus pressure relief device function Fluid identification — confirm mineral oil versus FR3 ester fill matches nameplate; esters carry a 360 C fire point Load test — energize and verify secondary voltage within 5% at each phase under load Records — factory test report, DGA history, and loading history; missing history reprices the unit toward as-is

Procurement channels

Direct quotes for new; Surplus Record's Virginia category, Machinio, Equipt, and Veracity Connect for used VTC units, all observed price-on-request.