# High-Voltage & Transmission Power Transformers

> 5 MVA–1000 MVA 110 kV, 154 kV, 380 kV, 500 kV and 1000 kV UHV AC/DC transmission and interconnection power transformers.

> High dynamic short-circuit withstand power transformers for national transmission grids (TEİAŞ), hydro, nuclear and thermal plants and mega industrial zone substations.

> Parent hierarchy: [Power & Energy Equipment](https://voltformer.com/catalog.md) / Transformers

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

## Subcategories

- [Substation Step-Down Power Transformers (110-330 kV)](https://voltformer.com/category/power-transmission-transformers/substation-step-down-power-transformers.md): Verify configuration-specific ratings and compliance in the manufacturer documentation. - 25 MVA - 250 MVA, 110 kV - 330 kV / 13.8 kV - 110 kV
- [Generator Step-Up Transformers (GSU)](https://voltformer.com/category/power-transmission-transformers/generator-step-up-transformers.md): Verify configuration-specific ratings and compliance in the manufacturer documentation. - 100 MVA - 1000 MVA, 220 kV - 525 kV / 15 kV - 35 kV
- [Interconnection & Transmission Autotransformers (345-380 kV)](https://voltformer.com/category/power-transmission-transformers/interconnected-grid-autotransformers.md): Verify configuration-specific ratings and compliance in the manufacturer documentation. - 150 MVA - 250 MVA, 345 kV - 380 kV / 154 kV - 161 kV / 34.5 kV
- [UHV & EHV Ultra-High-Voltage & HVDC Converter (750-1100 kV)](https://voltformer.com/category/power-transmission-transformers/uhv-ultra-high-voltage-transformers.md): Verify configuration-specific ratings and compliance in the manufacturer documentation. - 334 MVA - 1000 MVA, See selected product ratings

## Sample Products

- [VF-TBEA-PWR-31.5MVA-110 - TBEA 31.5 MVA 110/34.5 kV Substation Step-Down Power Transformer (OLTC)](https://voltformer.com/product/tbea-31-5-mva-110-34-5-kv-substation-step-down-power-transformer-oltc.md)
- [VF-TBEA-PWR-50MVA-154 - TBEA 50 MVA 154/34.5 kV On-Load Tap-Changing (OLTC) High-Voltage Power Transformer](https://voltformer.com/product/tbea-50-mva-154-34-5-kv-on-load-tap-changing-oltc-high-voltage-power-transformer.md)
- [VF-TBEA-PWR-100MVA-154 - TBEA 100 MVA 154/34.5 kV High-Voltage Transmission Grid Power Transformer](https://voltformer.com/product/tbea-100-mva-154-34-5-kv-high-voltage-transmission-grid-power-transformer.md)
- [VF-TBEA-PWR-250MVA-380 - TBEA 250 MVA 380/154/34.5 kV Three-Winding Interconnection Autotransformer](https://voltformer.com/product/tbea-250-mva-380-154-34-5-kv-three-winding-interconnection-autotransformer.md)
- [VF-TBEA-UHV-1000MVA-1000 - TBEA 1000 MVA 1000 kV UHV AC Ultra-High-Voltage Transmission Power Transformer](https://voltformer.com/product/tbea-1000-mva-1000-kv-uhv-ac-ultra-high-voltage-transmission-power-transformer.md)
- [VF-ABB-PWR-50MVA-154 - Hitachi Energy / ABB TrafoStar 50 MVA 154/34.5 kV High-Voltage Power Transformer](https://voltformer.com/product/hitachi-energy-abb-trafostar-50-mva-154-34-5-kv-high-voltage-power-transformer.md)
- [VF-BST-PWR-50MVA-154 - BEST Transformer 50 MVA 154/34.5 kV High-Voltage Step-Down Power Transformer (TEİAŞ Compliant)](https://voltformer.com/product/best-transformer-50-mva-154-34-5-kv-high-voltage-step-down-power-transformer-tei-as-compliant.md)
- [VF-BTW-UHV-1000M-1000K - Baobian Electric (BTW) 1000 MVA 1000 kV Single-Phase UHV AC Autotransformer](https://voltformer.com/product/baobian-electric-btw-1000-mva-1000-kv-single-phase-uhv-ac-autotransformer.md)

## Technical specialization coverage

- **On-Load Tap Changer Automatic Voltage Regulation (OLTC)** (Substation Step-Down Power Transformers (110-330 kV)): Catalogued in the current snapshot.
- **De-Energized Tap Changer Step-Down Power (NLTC)** (Substation Step-Down Power Transformers (110-330 kV)): Catalogued in the current snapshot.
- **Nuclear, Thermal & Hydroelectric Plant GSU** (Generator Step-Up Transformers (GSU)): Catalogued in the current snapshot.
- **Three-Winding 380/154/34.5 kV Interconnected Transmission Backbone** (Interconnection & Transmission Autotransformers (345-380 kV)): Catalogued in the current snapshot.
- **Tertiary-Wound Reactive Power Shunt Reactor Connected** (Interconnection & Transmission Autotransformers (345-380 kV)): Catalogued in the current snapshot.
- **750-1100 kV UHV AC Grid Transmission Transformers** (UHV & EHV Ultra-High-Voltage & HVDC Converter (750-1100 kV)): Catalogued in the current snapshot.
- **±800 kV / ±1100 kV HVDC Converter Transformers** (UHV & EHV Ultra-High-Voltage & HVDC Converter (750-1100 kV)): Catalogued in the current snapshot.

## Official sources

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

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

## Typical Industries

- National High-Voltage Transmission Grids
- Major Power Plants (Hydro, Thermal, Nuclear)
- Mega Industrial Zone Step-Down Substations
- Heavy Metallurgy