Which 345/34.5 kV transformers are publicly documented?
The Prolec GE G5058-03-01 page uses serial-specific nameplate and approval drawings. The Georgia Transformer GA447A page uses serial-specific approval drawings and a September 2024 factory acceptance test report.
G5058-03-01 is described as collector step-up duty at 132/176/220 MVA with a 13.8 kV tertiary and nominal 12.0% H-X design impedance on a 132 MVA base. GA447A is described at 108/144/180 MVA with a 12 kV buried-delta tertiary and a measured 6.99% H-X impedance on a 108 MVA base. These values are not interchangeable and must be checked against the project study basis.
What controls 345 kV collector-transformer fit?
Confirm collector voltage and grounding, winding vector, tertiary function, MVA and cooling stages, impedance and tolerance, BIL, LTC/DETC scope, renewable or converter harmonics, reactive requirements, fault cases, protection, losses, sound, accessories, and site interfaces.
- Use final drawings and test values, not a headline ratio, to compare candidates.
- Review switching and temporary overvoltage cases with the responsible system engineer.
- Coordinate transport configuration, oil shipment, bushing/cooler handling, route survey, foundation loads, field assembly, testing, and commissioning.
How should a 345 kV buyer request the technical package?
Identify the exact opportunity reference or send the one-line, MVA stages, 345 kV system basis, 34.5 kV collector requirements, tertiary duty, study impedance, vector, taps, site, destination, condition acceptance, and schedule.
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 publish 345/34.5 kV transformers?
Yes. Two permanent pages describe document-backed 180 and 220 MVA-class opportunities.
Are both 345 kV units collector step-up transformers?
The Prolec GE package explicitly identifies collector step-up duty. The Georgia unit’s final project duty and fit must be confirmed from the complete package.
Are FAT records available?
A September 2024 FAT report was reviewed for GA447A. Request the current seller package and any disclosure terms for serial-specific records.