# Hyosung Heavy Industries Validates Domestic ±525 kV VSC Converter Valve and 600 MVA Converter Transformer Architecture

> South Korea’s Hyosung Heavy Industries has completed full electrical, thermal, and dielectric validation tests for its indigenous ±525 kV Voltage Source Converter (VSC) valve modules and single-phase 600 MVA converter transformers at its Changwon high-voltage testing laboratory.

- **Publish Date:** 2026-09-14
- **Category:** transformers-grid
- **Reading Time:** 5 min
- **Original Source Citation:** [Hyosung Heavy Industries R&D Center & Korea Electric Power Corp (KEPCO)](https://www.hyosungheavyindustries.com/en/media/news/525kv-vsc-hvdc-valve-transformer-localization-september-2026)
- **Tags:** Hyosung, HVDC, 525 kV, Converter Transformer, VSC, South Korea, KEPCO
- **Canonical URL:** https://voltformer.com/news/hyosung-heavy-industries-localizes-525kv-vsc-hvdc-valves-converter-transformers
- **Markdown Source:** https://voltformer.com/news/hyosung-heavy-industries-localizes-525kv-vsc-hvdc-valves-converter-transformers.md

## Full Localization of Critical High-Voltage DC Substation Assets

Conducted in partnership with state utility KEPCO, the milestone successfully completes the localization of core components for multi-terminal HVDC grids, including high-power IGBT valve stacks, advanced optical firing control electronics, and DC smoothing reactors.

The 600 MVA single-phase converter transformer passed rigorous DC combined dielectric bias tests and short-circuit withstand evaluations complying with IEC 60076 and IEC 61378 standards.

## Powering East Asian Grid Interconnections and AI Data Hubs

The localized ±525 kV platform is targeted for South Korea’s upcoming East Coast-to-Seoul bulk transmission expansion and future offshore wind connections along the southwestern coastline.

Hyosung confirmed commercial manufacturing will ramp up in early 2027, reducing South Korea’s historical reliance on European and North American converter vendors.

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