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MPT-1 listing review
CTG is not affiliated with Vela. The seller must confirm availability.
Listing against the basis
Select a value to inspect the finding.
| Value | Project basis | CTG listing |
|---|---|---|
| 138 / 34.5 kV | 138 / 34.5 / 13.8 kV | |
| 72 / 96 / 120 MVA | 69 / 92 / 115 MVA | |
| ONAN / ONAF / ONAF | ONAN / ONAF1 / ONAF2 | |
| 650 / 200 kV | 650 / 200 kV | |
| YNd1 | YNyn0+d | |
| 8.5% | Not on the page | |
| On-load, ±10% | On-load, range not stated |
Voltage
DiffersThe listing includes a 13.8 kV tertiary winding. The project basis specifies 138 / 34.5 kV. Send the connection requirements to engineering for review.
PFS-EQ-201 Rev 03 · CTG capture, 21 Sep 2026Create an engineering review for MPT-1
Reviewer Luis Ortega · 3 differences · 2 seller questions
Review the differences, then try an action. No request is sent.
Fictional project, captured public listing. Your choices stay in this demo.
Check the unit against the design.
Compare new and refurbished units with the design basis. Trace each difference to the record an engineer needs to review.
- 1Vela opens TX-01 and recalls what the project decided about it.
- 2Cloud agents open reseller sites and read every listing.
- 3A listed rating is checked against the load in the basis.
- 4A unit with no on-load tap changer is set aside.
- 5A different impedance reaches the protection study, so Vela flags it.
- 6What it read, where, and what to ask stays on TX-01.
TX-01 · 138/34.5 kV, 75/100 MVA
- Voltage and terminalsTTE, 69/92/115 MVA, new: 138 / 34.5 kV with a 13.8 kV tertiary
Basis 138 / 34.5 kV, NAC-EQ-118 Rev 05Tertiary is not in the design. Engineer reviewAsked the seller whether the tertiary can stay unloaded - A second resellerSunbelt Solomon, ready to ship: substations listed as a category, no unit ratings on the pageBasis 138/34.5 kV, 75/100 MVA, NAC-EQ-118 Rev 05Nothing on the page to compareQuote request drafted for a person to review
- Rating and coolingTTE, 69/92/115 MVA, new: ONAN / ONAF1 / ONAF2Basis 75 MVA ONAN, 100 MVA ONAF, NAC-EQ-118 Rev 05Base stage is 6 MVA under. Engineer reviewKept for review, with the load case attached
- Ratio and tapsWaukesha, 30 to 56 MVA, built 2003: five de-energized taps, 131.1 to 144.9 kVBasis on-load taps ±10%, NAC-E-105 Rev 06No on-load tap changer. Outside basisSet aside, and the reason kept on TX-01
- ImpedanceWaukesha, 30 to 56 MVA, built 2003: 9.69%Basis 9.25%, NAC-E-214 Rev 030.44 points higher. Protection study flaggedOpened a question on NAC-E-214 for the engineer
- Vector groupTTE, 69/92/115 MVA, new: YNyn0+dBasis Dyn1, NAC-E-105 Rev 06Differs from the basis. Engineer reviewOpened a question on NAC-E-105 for the engineer
- Design basisNAC-EQ-118 · Rev 05
- Public listings read2 kept for review, 1 set asideCTG Power Systems, public inventory, 20 Sep 2026
- Questions for the sellerNameplate, test report, outlineDrafted for review
- TX-01 on site, 6 Nov 2026NAC-PROC-2210
Separate example: Northstar TX-01, 138/34.5 kV, 75/100 MVA. Illustrative model and design basis. Geometry is representative, not a manufacturer's arrangement. Candidate values are from CTG Power Systems, public inventory, and the Sunbelt Solomon ready-to-ship page, both public and read 20 Sep 2026. Vela has no affiliation with either. A listing is not confirmed availability.
See the gaps before you commit.
A listed transformer can look close. Put the differences and missing specifications beside the project basis before an engineer decides.
MPT-1 · Candidate comparison
What still needs an answer
| Specification | Project basis | CTG listing | Next step |
|---|---|---|---|
| Voltage | 138 / 34.5 kV | 138 / 34.5 / 13.8 kV | Engineering review |
| Rating | 72 / 96 / 120 MVA | 69 / 92 / 115 MVA | Engineering review |
| Vector group | YNd1 | YNyn0+d | Engineering review |
| Impedance | 8.5% | Not on the page | Ask the seller |
| Taps | On-load, ±10% | On-load, range not stated | Ask the seller |
