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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 | 71.2 MVA Prolec GE 240/120-13.8 kV GSUJJ-PGE-240-71 | Royal SMIT 525/69 kV Transformers — 3 AvailableJJ-SMIT-525-3 |
|---|---|---|
| Manufacturer | Prolec GE | Royal SMIT |
| Rating / output | 42.7/57/71.2 MVA at 60 Hz | 240/320/400 MVA; 250 MVA maximum step-down; 90 MVA tertiary |
| Voltage / winding arrangement | 240/120 kV grounded-wye dual-voltage to 13.8 kV delta | 525/69 kV with 13.7 kV buried-delta tertiary |
| Vector group | Grounded Wye–Delta; clock to confirm | YNyn0(d1) — Wye–Wye / buried Delta |
| Frequency | 60 Hz | 60 Hz |
| Cooling | ONAN / ONAF / ONAF | ONAN / ONAF / ONAF |
| Impedance and base | Not documented; confirm with J&J | H–X: 12.90% at 240 MVA, 525/69 kV, 85°C |
| Tap changer | Dual-voltage HV DETC; confirm series/parallel reconnection and the complete 11-position tap table | HV OLTC; 472.5–577.5 kV (±10%); 16 raise / 16 lower steps of 0.625% |
| Insulation / BIL | HV winding: 900 kV series / 650 kV parallel; HV bushings 900 kV; LV 110 kV; HV neutral 250 kV | HV winding 1550 kV / bushing 1675 kV; LV 350 kV; tertiary 150 kV |
| Quantity represented | 1 documented unit | 3 units |
| Technical details / open items | Generator step-up transformer; three-phase, 60 Hz, ONAN/ONAF/ONAF; Dual-voltage grounded-wye high side rated 240 or 120 kV with 13.8 kV delta low side; De-energized tap changer, copper windings, mineral oil, and suitable-for-step-up designation; Manufacture date is not completed on the reviewed drawing; 2012 is the drawing-approval date, not a claimed build year | Three units offered for allocation; availability and 4–8 week shipping schedule confirmed by J&J on October 1, 2026.; Nameplate rating: 240/320/400 MVA with ONAN/ONAF/ONAF cooling. Maximum stated duty: 400 MVA step-up or 250 MVA step-down.; Three-phase, 60 Hz; 525 kV grounded-wye high side, 69 kV wye low side, and 13.7 kV buried-delta tertiary rated 90 MVA.; Copper windings; MR on-load tap changer; HV tap range 472.5–577.5 kV (±10%).; HV BIL: 1550 kV winding / 1675 kV bushing. LV BIL: 350 kV.; Nameplate H-X impedance: 12.90% at 240 MVA base, 525/69 kV, 85°C.; Supplied 2022 factory acceptance test report records Passed for the documented unit. Nameplate, outline drawing and test report available through J&J; match the records to all three units before purchase. |
| Evidence reviewed | Serial-specific approval nameplate drawing reviewed | Supplied nameplate, outline drawing and factory acceptance test report |
| Technical value basis | Supplied approval nameplate drawing; its approval date is not a manufacture date. | Supplied nameplate for one documented unit; match the complete package to each of the three offered units. |
| Details to confirm | Final manufacture year, tested impedance/base and selected voltage/tap connection; Current preservation, final oil quantity, dimensions, shipping weight and accessory scope | Matching records for each offered unit, current condition, included accessories and transport scope; Unit-specific factory tests, present preservation and the step-down duty limit |
| Represented condition | Brand new, never used and never energized | 2022 manufacture shown in supplied nameplate; condition and service history confirmed with quotation |
| Equipment location | USA | International; dispatch location confirmed with quotation |
| Technical records reviewed | 2026-10-08 | 2026-10-08 |
| Availability | Available; approval nameplate drawing reviewed; subject to prior sale and written reconfirmation | Immediately available; estimated 4–8 weeks to ship; subject to prior sale |
| Availability last confirmed | 2026-09-24 | 2026-10-01 |
| Shipping estimate | Request a written dispatch and delivery schedule | 4–8 weeks to ship |
| Nameplate reviewed | Yes — request the unit package | Yes — request the unit package |
| Drawings reviewed | Yes — request matching unit drawings | Yes — request matching unit drawings |
| Factory test report reviewed | Not recorded as reviewed; request test records | Report reviewed; confirm matching records for each unit |
| 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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