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Review the published facts side by side. Matching a voltage or MVA rating does not establish compatibility. Ask your project engineer to review the complete unit records.
| Compare | Westinghouse / GE 66 MVA Rebuilt Transformer OffersJJ-WEST-GE-66-2 | 220 MVA 345/34.5 kV Prolec GE TransformerJJ-TX-002 |
|---|---|---|
| Manufacturer | Westinghouse | Prolec GE |
| Rating / output | 39.6/52.8/66 MVA represented; 66 MVA in one supplied report | 132/176/220 MVA; 46.2/61.6/77 MVA tertiary |
| Voltage / winding arrangement | 140.9 kV Delta / 34.5 kV Wye in one report; offered as nominal 138/34.5 kV | 345/34.5 kV with 13.8 kV delta tertiary |
| Vector group | Delta–Wye in one supplied report; both nameplates and clock to confirm | Grounded Wye–Wye / Delta; clock to confirm |
| Frequency | 60 Hz in the supplied report; confirm both units | 60 Hz |
| Cooling | OA / FA in the supplied report | ONAN / ONAF / ONAF |
| Impedance and base | 7.2% reported; MVA base to confirm | Design H–X: 12.0% at 132 MVA |
| Tap changer | Not documented; confirm with J&J | Not documented; confirm with J&J |
| Insulation / BIL | Not documented; confirm with J&J | Not documented; confirm with J&J |
| Quantity represented | 2 represented units; report reviewed for 1 | 1 documented unit |
| Technical details / open items | The offer represents two Westinghouse transformers rebuilt by GE Energy, rated 39.6/52.8/66 MVA. One supplied nameplate states March 2008 remanufacture, conflicting with the email's 2012 rebuild claim; reconcile the rebuild history for each unit.; The offered nominal 138/34.5 kV description differs from the 140.9 kV delta / 34.5 kV wye nameplate fields in the supplied report for one unit. Resolve this before approving project duty; 138 kV is not presented as a verified nameplate rating.; The readable report covers one unit, not both. It records three-phase, 60 Hz, 66 MVA, OA/FA cooling, 65 C rise and 7.2% impedance; confirm the nameplate and rating basis for each unit.; Maintenance entries record bottom-valve oil leaks through March 2026 and a broken gauge in November 2025. Present repair completion and condition have not been verified.; A July 2025 dielectric result was recorded as unacceptable, followed by later acceptable readings. Obtain the complete history, current inspection and new tests appropriate to the purchase.; Request the second unit's individual nameplate, test and maintenance package. Historical service entries do not establish present operating status, readiness to energize or availability. | Collector step-up duty; ONAN/ONAF/ONAF, 60 Hz, three-phase; Grounded-wye / grounded-wye / delta winding configuration; Nominal design H-X impedance: 12.0% on a 132 MVA base |
| Evidence reviewed | Written offer identifies Westinghouse manufacture and a GE Energy rebuild; supplied maintenance report covers one unit | Serial-specific nameplate and approval drawings reviewed |
| Technical value basis | Supplied nameplate and maintenance report for one unit in a two-unit offer; match the second unit separately and reconcile the rebuild dates. | Supplied nameplate and approval drawings; design values require matching final factory records. |
| Details to confirm | Both final nameplates and exact voltage fit; rating stages and impedance bases; Current leak/gauge repairs, oil analysis, full tests, service history and transport scope | Final tested impedance, insulation levels, complete tap schedule and approved drawing revision; Overall and shipping dimensions, shipping weight, accessory schedule and current preservation |
| Represented condition | Pre-owned / rebuilt; recorded valve leaks and broken gauge require present repair verification | Brand new, never used and never energized; approval drawings reviewed |
| Equipment location | USA | USA |
| Technical records reviewed | 2026-10-08 | 2026-10-08 |
| Availability | Offered September 23, 2026; voltage, present condition and availability require written confirmation | Available; nameplate and approval drawings reviewed; subject to prior sale and written confirmation |
| Availability last confirmed | Request current confirmation | 2026-09-24 |
| Shipping estimate | Request a written dispatch and delivery schedule | Request a written dispatch and delivery schedule |
| Nameplate reviewed | Not recorded as reviewed; request it | Yes — request the unit package |
| Drawings reviewed | Not recorded as reviewed; request them | Yes — request matching unit drawings |
| Factory test report reviewed | Not recorded as reviewed; request test records | Not recorded as reviewed; request test records |
| This unit only | Request more info | Request more info |
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Confirm frequency, cooling-stage ratings, impedance and its base, taps, vector group, grounding, BIL, site conditions and included scope against the project specification. A table cannot approve the fit.
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