# Hyosung Heavy Industries 334 MVA 441.7/199.2 kV UHV & EHV Ultra-High-Voltage & HVDC Converter (750-1100 kV)

> Hyosung Heavy Industries 334 MVA 441.7/199.2 kV UHV & EHV Ultra-High-Voltage & HVDC Converter (750-1100 kV) belongs to the UHV & EHV Ultra-High-Voltage & HVDC Converter (750-1100 kV) category and is rated at 334 MVA with 441.7/199.2 kV primary/secondary voltage. Application: 765 kV Ultra-High-Voltage Transmission Backbones (3x334 MVA = 1000 MVA Bank). Final ratings must be verified against the manufacturer datasheet.

> SKU: VF-HYO-UHV-334MVA-765 | Brand: Hyosung Heavy Industries | Category: Power & Energy Equipment / Transformers / High-Voltage & Transmission Power Transformers / UHV & EHV Ultra-High-Voltage & HVDC Converter (750-1100 kV)

**Voltformer canonical:** https://voltformer.com/product/hyosung-334-mva-765-kv-single-phase-uhv-autotransformer - markdown version: https://voltformer.com/product/hyosung-334-mva-765-kv-single-phase-uhv-autotransformer.md

## Overview

Hyosung Heavy Industries 334 MVA 441.7/199.2 kV UHV & EHV Ultra-High-Voltage & HVDC Converter (750-1100 kV) is intended for 765 kV Ultra-High-Voltage Transmission Backbones (3x334 MVA = 1000 MVA Bank). Configured electrical data: 334 MVA, 441.7/199.2 kV primary/secondary voltage, 50 Hz, 1-phase, vector group YNa0+d and short-circuit impedance 14.5%. Construction: Copper (Cu-Cu); cooling: ODAF; loss class: IEC 60076 SOTA UHV. These values support preliminary engineering selection; verify insulation levels, thermal limits, short-circuit duty, installation conditions and applicable standards against the manufacturer datasheet and the site study.

- **Application:** 765 kV Ultra-High-Voltage Transmission Backbones (3x334 MVA = 1000 MVA Bank)
- **Target industries:** Intercontinental Power Interconnectors, Nuclear & Mega Hydro Dam Switchyards
- **Brand:** [Hyosung Heavy Industries](https://voltformer.com/brand/hyosung-heavy-industries.md) - Hyosung Heavy Industries is a premier global power equipment manufacturer specializing in 765 kV ultra-high-voltage power transformers, 800 kV GIS, and grid-scale STATCOM systems.
- **Category:** [Power & Energy Equipment](https://voltformer.com/catalog.md) / **Transformers** / [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. / [UHV & EHV Ultra-High-Voltage & HVDC Converter (750-1100 kV)](https://voltformer.com/category/power-transmission-transformers/uhv-ultra-high-voltage-transformers.md)

## Technical Specifications

| Property | Value |
|---|---|
| Rated power | 334 MVA |
| Primary / secondary voltage | 441.7 kV / 199.2 kV (±4 x 1.25%) |
| Frequency / phases | 50 Hz / 1-phase - YNa0+d |
| Short-circuit impedance (Uk) | 14.5% |
| No-load loss P0 | 90.00 kW |
| Load loss Pk | 620.0 kW |
| Calculated efficiency (power factor = 1) | 99.79% at 100% load; 99.85% at 50% load |
| Loss class | IEC 60076 SOTA UHV |
| Windings | Copper (Cu-Cu) - cooling: ODAF - insulation: Class A (105°C) |
| Temperature rise | 65 K - sound pressure: 72 dB(A) |
| Mass and dimensions | 245000 kg - 9800×5800×8900 mm |
| Enclosure | IP55 outdoor - wheel gauge: 2000 mm |
| LI / AC withstand | 2100 kV peak / 830 kV rms - partial discharge: 30 pC |
| Environment | -40°C / +50°C; altitude ≤ 1000 m |
| Core steel | CRGO Laser-Treated Grain-Oriented Silicon Steel (23ZDMH85 / Baosteel B23R085) |
| Bushings / terminals | Configuration-specific technical value |

## Standards

- IEC 60076
- IEEE C57

## Accessories

**Included:** 765 kV RIP Kondenser Bushing, Configuration-specific technical value, Optical Fiber Temperature Sensors
**Optional:** Configuration-specific technical value, Configuration-specific technical value

## Official sources

- https://www.hyosungheavyindustries.com/

- **Source scope:** manufacturer-family
- **Last reviewed:** 2026-09-13

Manufacturer portfolio/family source. Confirm the exact order code, guaranteed ratings and project-specific options against the current OEM datasheet before procurement or an SLD study.

## Pricing & Logistics

- Pricing type: RFQ (On Request) - Indicative range: $2,800,000 – $3,400,000 USD
- Delivery time: 2–8 weeks (may vary depending on technical configuration, factory capacity and destination) - Warranty: 60 months
- Compliance candidates: IEC 60076, IEEE C57. Verify applicability and conformity against the exact offered model and project jurisdiction.

## RFQ

Request a formal factory quotation via Voltformer RFQ:

```json
POST https://voltformer.com/api/v1/rfq
{"companyName":"Example Energy","email":"procurement@example.com","items":[{"skuOrId":"VF-HYO-UHV-334MVA-765","quantity":1}]}
```

Full catalog JSON: https://voltformer.com/agent-catalog.json - OpenAPI: https://voltformer.com/openapi.json