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Compare equipment before you request it.
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 | 105 MVA 161/34.5 kV Siemens Energy TransformerJJ-SIEMENS-161-105 | 220 MVA 345/34.5 kV Prolec GE TransformerJJ-TX-002 |
|---|---|---|
| Manufacturer | Siemens Energy | Prolec GE |
| Rating / output | 63/84/105 MVA | 132/176/220 MVA; 46.2/61.6/77 MVA tertiary |
| Voltage / winding arrangement | 161/34.5 kV with 13.8 kV tertiary | 345/34.5 kV with 13.8 kV delta tertiary |
| Vector group | Not stated in supplied records | Grounded Wye–Wye / Delta; clock to confirm |
| Frequency | 60 Hz | 60 Hz |
| Cooling | ONAN / ONAF1 / ONAF2 | ONAN / ONAF / ONAF |
| Impedance and base | H–X: 9.25% at 63 MVA; 12.34% at 84 MVA; 15.42% at 105 MVA | Design H–X: 12.0% at 132 MVA |
| Tap changer | HV OLTC; 144.9–177.1 kV (±10%); ±8 steps of 1.25% | Not documented; confirm with J&J |
| Insulation / BIL | HV line 650 kV; HV neutral and LV 200 kV; tertiary 110 kV | Not documented; confirm with J&J |
| Quantity represented | 1 nameplate-documented unit | 1 documented unit |
| Technical details / open items | 2022 manufacture shown on nameplate; three-phase, 60 Hz, copper windings; ONAN/ONAF1/ONAF2 cooling and approximately 144.9-177.1 kV HV OLTC range; Nameplate identifies 34.5 kV low-side and 13.8 kV additional winding; Supplied equipment photo shown; request the connection diagram, complete matching records and preservation history through J&J | 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 | Serial-specific nameplate photograph reviewed | Serial-specific nameplate and approval drawings reviewed |
| Technical value basis | Supplied individual nameplate photograph; verify the winding diagram and current preservation. | Supplied nameplate and approval drawings; design values require matching final factory records. |
| Details to confirm | Complete winding connection/clock diagram and tertiary MVA duty; Current preservation, matching tests, dimensions and accessory completeness | 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 | Brand new, never used and never energized; 2022 nameplate reviewed | Brand new, never used and never energized; approval drawings reviewed |
| Equipment location | USA | USA |
| Technical records reviewed | 2026-10-08 | 2026-10-08 |
| Availability | Available; nameplate reviewed; subject to prior sale and written reconfirmation | Available; nameplate and approval drawings reviewed; subject to prior sale and written confirmation |
| Availability last confirmed | 2026-09-24 | 2026-09-24 |
| Shipping estimate | Request a written dispatch and delivery schedule | Request a written dispatch and delivery schedule |
| Nameplate reviewed | Yes — request the unit package | 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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