Purpose-built for connecting generators directly to the transmission grid. Custom-engineered from 20 to 600 MVA, up to 525 kV HV — built to IEEE C57 family and ANSI standards for wind, solar, gas, nuclear, and data center power applications.
| Category | Specification |
|---|---|
| Capacity Range | 20–600 MVA |
| Phases | Single-phase and three-phase |
| LV Winding (Generator Side) | Up to 35 kV |
| HV Winding (Grid Side) | 115 kV, 138 kV, 230 kV, 345 kV, 500 kV, 525 kV classes |
| LV Winding Configuration | Delta (wind/solar standard); Wye (gas/nuclear available) |
| Tap Changer | De-Energized (DETC) standard; On-Load (OLTC) available |
| Cooling Methods | ONAN / ONAF / OFAF (specified per load profile) |
| Winding Material | High-conductivity copper (standard) |
| Insulation Medium | Liquid-immersed mineral oil |
| Standards | IEEE C57.12.00, IEEE C57.12.10, IEEE C57.12.90, ANSI |
| IRA Eligibility | Domestic content compliant; eligible for IRA §48 bonus credits |
| Compliance | Buy American Act (BAA), BABA, §303 Defense Production Act |
| Factory Testing | IEEE C57.12.90 routine and type tests; full test report included |
| Lead Time | 48 weeks |
| Manufacturing | United States |
LIMIK GSU transformers are custom-engineered, liquid-immersed units designed to connect generators directly to the transmission grid. Built for wind farms, utility-scale solar, gas-fired and nuclear generation, and large data center backup power — every unit is engineered to your exact generator terminal voltage, MVA output, and grid interconnection requirement.
Available from 20 to 600 MVA with LV (generator-side) windings up to 35 kV and HV (grid-side) windings at 115 kV, 138 kV, 230 kV, 345 kV, 500 kV, and 525 kV classes. Delta LV winding configurations standard on wind and solar applications; wye configurations available for gas and nuclear units.
All units designed to IEEE C57.12.00 and IEEE C57.12.10 with full ANSI compliance. Factory-tested to IEEE C57.12.90. IRA-eligible under domestic content requirements. Buy American Act (BAA), BABA, and §303 Defense Production Act compliant on every order. Typical lead time: 48 weeks from signed specification to shipment.
Utility-scale wind farms requiring step-up from generator terminal voltage to transmission grid — with delta LV winding standard for harmonic isolation.
Solar PV and CSP plant interconnection. Delta LV winding for ground fault protection and harmonic isolation in variable-output generation environments.
Combined-cycle gas turbines, peaker plants, and nuclear generation facilities requiring direct grid interconnection at 115 kV through 525 kV.
LV winding matched to your generator terminal voltage — up to 35 kV. HV winding engineered to your grid interconnection point: 115 kV through 525 kV.
Delta-connected LV winding standard on renewable applications for harmonic isolation and ground fault protection. Wye-connected LV available for gas-fired and conventional generation.
Manufactured in the United States and eligible for IRA domestic content bonus credits under 26 U.S.C. §48. Documentation provided for project compliance filings.
Satisfies BAA, BABA, and Berry Amendment requirements. Eligible for DOD/DOE direct procurement under §303 Defense Production Act.
