Which 115/34.5 kV transformers are currently published?
The public inventory includes three Virginia Transformer HB501 units rated 36/48/60 MVA and two HB533 units represented at 50.4/67.2/84 MVA.
The HB501 pages are supported by three unit-specific nameplates dated February–March 2026. The HB533 opportunity is supported by a two-unit nameplate design sheet; manufacture date, current condition, and final tested impedance remain open items. Each permanent inventory URL states the evidence reviewed and the facts still requiring confirmation.
What must match besides 115/34.5 kV and MVA?
Confirm winding connection and phase shift, impedance on its stated MVA base, taps, BIL, cooling stages, frequency, losses, terminals, accessories, controls, dimensions, weights, fluid, sound, site conditions, and project standards.
- Do not infer parallel compatibility from a matching ratio; verify vector group, impedance magnitude and tolerance, tap position, regulation, and protection studies.
- Use the actual nameplate and final test report where available; a design value is not a final tested value.
- Coordinate transport, offload, foundation loads, oil handling, field assembly, testing, and energization milestones before a commercial commitment.
How should a 115 kV transformer RFQ be submitted?
Send the required continuous and forced-cooled MVA stages, 115 kV system basis, low-side voltage, winding connections, target impedance and base, taps, BIL, quantity, project state, destination, and needed-on-site date.
Public listings are opportunities for technical screening, not guaranteed stock. Seller authority, serial identity, current condition, location, availability, price, included scope, and delivery require current written confirmation.
Frequently asked questions
These answers explain the procurement and application questions buyers ask most often. Unit-specific ratings, availability, conformity, condition, price, and delivery are controlled by the written quotation and supporting documents.
Does J&J list 115/34.5 kV transformers?
Yes. Two current public opportunity pages represent five unit IDs, subject to written reconfirmation and technical fit.
Are all five 115 kV units identical?
No. The HB501 and HB533 groups have different MVA classes and evidence bases; serial-specific data must be reviewed by unit.
Can two 115 kV transformers operate in parallel?
Only after the responsible engineer confirms ratio, vector relationship, impedance, taps, protection, grounding, and system studies.