# Generator Step-Up Transformers (GSU) - High-Voltage & Transmission Power Transformers

> Verify configuration-specific ratings and compliance in the manufacturer documentation.

> Power/rating scope: 100 MVA - 1000 MVA | Voltage scope: 220 kV - 525 kV / 15 kV - 35 kV

**Canonical:** https://voltformer.com/category/power-transmission-transformers/generator-step-up-transformers - markdown: https://voltformer.com/category/power-transmission-transformers/generator-step-up-transformers.md

## Parent

[High-Voltage & Transmission Power Transformers](https://voltformer.com/category/power-transmission-transformers.md): 5 MVA–1000 MVA 110 kV, 154 kV, 380 kV, 500 kV and 1000 kV UHV AC/DC transmission and interconnection power transformers.

## Sample Products

- [VF-BTW-NUC-400M-500K - Baobian Electric DFP-400 MVA / 525 kV Nuclear Power Plant Generator Step-Up Transformer](https://voltformer.com/product/baobian-electric-dfp-400-mva-525-kv-nuclear-power-plant-generator-step-up-transformer.md)
- [VF-MEL-GSU-500MVA-500 - Mitsubishi Electric 500 MVA 500/22 kV Generator Step-Up Transformers (GSU)](https://voltformer.com/product/mitsubishi-electric-500-mva-500-kv-gsu-generator-step-up-transformer.md)
- [VF-GEV-GSU-1000M-550K - GE Vernova 1000 MVA 550 kV Generator Step-Up Transformer](https://voltformer.com/product/ge-vernova-1000-mva-550-kv-generator-step-up-transformer.md)
- [VF-HE-GSU-315M-765K - Hitachi Energy 315 MVA 765 kV Single-Phase GSU Transformer](https://voltformer.com/product/hitachi-energy-315-mva-765-kv-gsu-transformer.md)
- [VF-GEV-GSU-750M-400K - GE Vernova 750 MVA 400 kV Generator Step-Up Transformer](https://voltformer.com/product/ge-vernova-750-mva-400-kv-generator-step-up-transformer.md)
- [VF-HE-GSU-500M-765K - Hitachi Energy 500 MVA 765 kV Generator Step-Up Transformer](https://voltformer.com/product/hitachi-energy-500-mva-765-kv-generator-step-up-transformer.md)
- [VF-SIE-GSU-800M-400K - Siemens Energy 800 MVA 400/22 kV Generator Step-Up (GSU) Transformer](https://voltformer.com/product/siemens-energy-800-mva-400-kv-gsu-transformer.md)

## Technical specializations

- **Nuclear, Thermal & Hydroelectric Plant GSU** - Verify configuration-specific ratings and compliance in the manufacturer documentation.

## Official sources

- https://webstore.iec.ch/en/publication/599

- **Last reviewed:** 2026-09-13

## RFQ

Use the family-specific tools in [the tool reference](https://voltformer.com/tool-reference.md) and the canonical taxonomy at https://voltformer.com/agent-catalog.json. Sub-category: generator-step-up-transformers. The transformer query's subCategory parameter applies only to transformer families. Authenticate and obtain explicit confirmation before RFQ submission.