LPT-GSU
Large power / generator step-up transformer, ≤ 1,400 MVA
LPT-GSU
- Generator step-up and system interconnecting duty for power plants and HV grids — safe, reliable transmission of generated energy
- Loss-optimized design per specification with efficiencies above 99%; low-noise "whisper" variants for urban sites
- Mineral oil or biodegradable ester insulation liquids; fire-safe PRETACT EcoSafeT and tank-rupture-proven designs available
- Single- or three-phase, multi-winding or autotransformer configurations with on-load and/or de-energized tap changers
- Factory-tested (lightning impulse, temperature rise; short-circuit tests at internationally recognized institutes); available as Sensformer with digital monitoring
Generator step-up in power plantsHV grid interconnectionVoltage conversion in transmission networksLow-noise urban substationsOffshore installations
Sign in to see your price, availability and framework terms for LPT-GSU.
Horizon-3 pattern: this exact page gains commerce powers on sign-in — the URL never changes.
SIMULATED · ASK-AN-EXPERT PILOT DEMO
Ask an expert about LPT-GSU
15 minutes with the right transformers specialist — question in, booked call out. No email archaeology.
Checking availability…
Specifications
Main
| Product type | Generator step-up (GSU) / large power transformer |
| Application | Power plants and HV transmission grids; voltage conversion in transmission networks |
| Configuration | Single- or three-phase; multi-winding transformer or autotransformer |
| Voltage regulation | On-load tap changer (OLTC) and/or de-energized tap changer (DETC); motorized drive, local or remote control |
| Digital option | Available as Sensformer with digital monitoring features |
Electrical ratings
| Rated power | Up to 1,400 MVA (GSU); family range 30 to over 1,300 MVA |
| Voltage class | Up to 765 kV system voltage; insulation class up to 800 kV |
| Frequency | 50 / 60 Hz |
| Efficiency | > 99 % (standard for the family) |
| Losses & noise | Loss-optimized design per specification; extra-quiet "whisper" designs available |
Mechanical & environment
| Cooling | ONAN / ONAF / OFAF / ODAF (oil-air); OFWF / ODWF (oil-water); radiator banks attached or installed separately |
| Insulating liquid | Mineral oil, silicone oil, synthetic or natural ester (biodegradable) |
| Core | Cold-rolled, laser-treated steel sheets ≤ 0.3 mm, step-lap stacked |
| Windings | Disc and multi-layer windings with transposed copper conductors |
| Transport | Fully or partially transportable designs; reference unit 460 t total weight (400 MVA / 420 kV) |
| Safety options | Fire-safe PRETACT EcoSafeT designs with alternative fluids; tank-rupture-proven designs; offshore and low-noise urban variants |
Standards & testing
| Design standards | IEC 60076; ANSI/IEEE; further national standards on request |
| Quality management | ISO 9001-certified manufacturing plants (13 factories, 4 continents) |
| Factory tests | Voltage tests incl. lightning impulse withstand, temperature-rise, insulation resistance, harmonics, noise level |
| Short-circuit tests | Performed at internationally recognized and approved institutes |
Options & variants
Ratings as published per factory in the Siemens Energy Power Transformers FY2025 portfolio presentation (Aug 2025). Weiz, Linz and Trento list GSU explicitly at these values; Nuremberg, Zagreb and Charlotte publish one combined rating for their power-transformer line including GSU. Charlotte factory expected operational Nov 2026.
| Manufacturing plant | Max rating (MVA) | Voltage class (max) |
|---|---|---|
| Nuremberg, Germany | 1,400 MVA | 765 kV |
| Weiz, Austria | 1,300 MVA | 765 kV |
| Zagreb, Croatia | 1,000 MVA | 550 kV |
| Charlotte, USA | 500 MVA | 550 kV |
| Linz, Austria | 250 MVA | 300 kV |
| Trento, Italy | 200 MVA | 245 kV |
Compatible accessories
monitoring
Sensformer digital monitoring option
Documents & downloads
Brochure Power transformers — machine and network transformers from 30 to over 1,300 MVA (Siemens Energy, 2024)
Presentation Power Transformers portfolio FY2025 (Siemens Energy Grid Technologies, Aug 2025)
Also covered in the technical library
Brochure Siemens Energy Design Programs for Power Transformers — Integrated Tools for Highly Sophisticated Solutions
Brochure Transformers digitalization — Noedra Node suite for substation digitalization
Brochure Trusted Partner in the Energy Transition — Sustainable Power Transformers
Related products
MPT Medium power transformer, 230 / 345 kV HV voltage rating
230 / 345 kV HV variants · 75–167 MVA (documented example config) · ONAN/ONAF/OFAF cooling, OLTC Datasheet · Dimensions ↓
SR