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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 | 50 MVA-Class 138/13.8 kV Substation PackageJJ-TX-007 | Five 110 MVA 138/34.5 kV Kolektor ETRA GSUsJJ-138-110-5 |
|---|---|---|
| Manufacturer | Manufacturer to confirm | Kolektor ETRA |
| Rating / output | 30/39.9/50 MVA at 55 C; 33.6/44.7/56 MVA at 65 C | 66/88/110 MVA; 22/29.333/36.666 MVA tertiary |
| Voltage / winding arrangement | 138 kV delta / 13.8 kV grounded wye | 138/34.5 kV with 13.8 kV tertiary |
| Vector group | Delta–Grounded Wye; clock to confirm | YNyn0+d11 |
| Frequency | 60 Hz | 60 Hz |
| Cooling | ONAN / ONAF / ONAF | ONAN / ONAF1 / ONAF2 |
| Impedance and base | Not documented; confirm with J&J | Reviewed nameplate H–X: 8.09% at 66 MVA; supplied FAT reports 13.41% at 110 MVA. Match the test and plate to the selected unit. |
| Tap changer | Five-position HV DETC: 131.1, 134.55, 138, 141.45 and 144.9 kV (±5%, 2.5% steps) | HV OLTC; 124.2–151.8 kV (±10%); 16 raise / 16 lower steps of 0.625% on the reviewed plate |
| Insulation / BIL | HV 650 kV; LV 110 kV, drawing basis | Not documented; confirm with J&J |
| Quantity represented | 1 represented design package | 5 units; matching unit packages available on request |
| 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 | GSU duty; ONAN/ONAF1/ONAF2, 60 Hz, three-phase, vector group YNyn0+d11; Measured impedance: 13.41% on a 110 MVA base at nominal tap; 2020 factory tests passed; those records do not establish current condition; Five-unit lot includes two 2020 builds and three 2021 builds; request all five serial-specific packages before quotation |
| Evidence reviewed | Project-specific supplied approval drawings reviewed; final equipment OEM and serial identity require confirmation | Five-unit opportunity confirmed by seller; rating plate and FAT package reviewed for one unit |
| Technical value basis | Supplied approval design drawings; a completed individual nameplate and final equipment identity have not been established. | One supplied nameplate and one factory-test package; values are not established for all five units. |
| Details to confirm | Final OEM, individual equipment identity, manufacture year, tested impedance and factory reports; Final drawings, current preservation, complete accessories and shipping configuration | All five matching nameplates, insulation levels, approved drawings and factory tests; Reconcile unit-specific impedance bases; confirm current preservation and individual shipping weights |
| Represented condition | Brand new, never used and never energized; 2024 approval drawings reviewed; serial identity requires confirmation | Brand new, never used and never energized; 2020 factory records reviewed for one unit |
| Equipment location | USA | International; dispatch location confirmed with quotation |
| 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; 5 units represented; remaining unit packages require review; 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 | Not recorded as reviewed; request it | Yes — request the unit package |
| Drawings reviewed | Yes — request matching unit drawings | Not recorded as reviewed; request them |
| Factory test report reviewed | Not recorded as reviewed; request test records | Report reviewed; confirm matching records for each unit |
| This unit only | Email for specs & price | Email for specs & price |
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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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