Your equipment shortlist
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 | 50 MVA-Class 138/13.8 kV Substation PackageJJ-TX-007 | 120 MVA 138/34.5 kV Georgia Solar GSUJJ-TX-004 |
|---|---|---|
| Manufacturer | Manufacturer to confirm | Georgia Transformer |
| Rating / output | 30/39.9/50 MVA at 55 C; 33.6/44.7/56 MVA at 65 C | 72/96/120 MVA; 25.2/33.6/42 MVA tertiary |
| Voltage / winding arrangement | 138 kV delta / 13.8 kV grounded wye | 138/34.5 kV with 12 kV buried-delta tertiary |
| Vector group | Delta–Grounded Wye; clock to confirm | YNyn0+d1 |
| Frequency | 60 Hz | 60 Hz |
| Cooling | ONAN / ONAF / ONAF | ONAN / ONAF1 / ONAF2 |
| Impedance and base | Not documented; confirm with J&J | Measured H–X: 6.93% at 72 MVA; design value 7.2% |
| Tap changer | Five-position HV DETC: 131.1, 134.55, 138, 141.45 and 144.9 kV (±5%, 2.5% steps) | HV OLTC; 117.3–158.7 kV (±15%); confirm the final switch and step schedule |
| Insulation / BIL | HV 650 kV; LV 110 kV, drawing basis | HV line 650 kV; HV neutral, LV line and LV neutral 200 kV |
| Quantity represented | 1 represented design package | 1 documented unit |
| Technical details / open items | Oil-immersed substation transformer; ONAN/ONAF/ONAF, 60 Hz, three-phase; HV de-energized tap range: 131.1-144.9 kV; Final impedance, serial number, test data, and manufacture date are not populated | Solar GSU design; ONAN/ONAF1/ONAF2, 60 Hz, three-phase; Vector group YNyn0+d1 with HV OLTC and conservator oil system; Nameplate rating is used; an outline-drawing discrepancy requires final seller confirmation |
| Evidence reviewed | Project-specific supplied approval drawings reviewed; final equipment OEM and serial identity require confirmation | Serial-specific nameplate and approval drawings reviewed |
| Technical value basis | Supplied approval design drawings; a completed individual nameplate and final equipment identity have not been established. | Supplied unit nameplate; the nameplate takes precedence over the differing outline-drawing rating. |
| Details to confirm | Final OEM, individual equipment identity, manufacture year, tested impedance and factory reports; Final drawings, current preservation, complete accessories and shipping configuration | Resolve the outline-drawing rating discrepancy and confirm the final drawing revision; Current preservation, complete tests, dimensions and included accessory schedule |
| Represented condition | Brand new, never used and never energized; 2024 approval drawings reviewed; serial identity requires confirmation | 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; approval drawings reviewed; unit identity requires documentation; subject to prior sale and written confirmation | Available; engineering package reviewed; subject to prior sale and written reconfirmation |
| 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 | Not recorded as reviewed; request it | 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 | Not recorded as reviewed; request test records |
| This unit only | Email for specs & price | Email for specs & price |
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What still needs to be checked?
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.
Match the nameplate to the specification · Review surplus equipment records · Procurement checklist