# Siemens Energy ±800 kV 400 MVA UHVDC Converter Transformer

> Siemens Energy ±800 kV 400 MVA single-phase UHVDC converter transformer for point-to-point HVDC transmission links.

> SKU: VF-SIE-HVDC-400M-800K | Brand: Siemens Energy | 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/siemens-energy-400-mva-800-kv-uhvdc-converter-transformer - markdown version: https://voltformer.com/product/siemens-energy-400-mva-800-kv-uhvdc-converter-transformer.md

## Overview

Siemens Energy ±800 kV 400 MVA UHVDC Converter Transformer is intended for Changji-Guquan 12,000 MW ±1100 kV UHVDC Converter Station. Configured electrical data: 400 MVA, 500/800 kV primary/secondary voltage, 50 Hz, 1-phase, vector group Özel Bağlantı and short-circuit impedance 18%. Construction: Copper (Cu-Cu); cooling: ODAF; loss class: World Record UHVDC Converter Grade. 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:** Changji-Guquan 12,000 MW ±1100 kV UHVDC Converter Station
- **Target industries:** Long-Distance HVDC Transmission Lines, Offshore HVDC Converter Platforms
- **Brand:** [Siemens Energy](https://voltformer.com/brand/siemens-energy.md) - The embodiment of German engineering excellence; Siemens Energy sets the industry standard with GEAFOL® cast-resin dry-type transformers, ester-oil network units and transmission-level autotransformer
- **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 | 400 MVA |
| Primary / secondary voltage | 500 kV / 800 kV (±16 x 1.25% OLTC) |
| Frequency / phases | 50 Hz / 1-phase - special connection |
| Short-circuit impedance (Uk) | 18% |
| No-load loss P0 | 95.00 kW |
| Load loss Pk | 580.0 kW |
| Calculated efficiency (power factor = 1) | 99.8315% at 100% load; 99.8801% at 50% load |
| Loss class | World Record UHVDC Converter Grade |
| Windings | Copper (Cu-Cu) - cooling: ODAF - insulation: Class A |
| Temperature rise | 65 K - sound pressure: 73 dB(A) |
| Mass and dimensions | 295000 kg - 11000×5400×8200 mm |
| Enclosure | IP55 - wheel gauge: 3000 mm |
| LI / AC withstand | 1950 kV peak / 830 kV rms - partial discharge: 20 pC |
| Environment | -25°C / +40°C; altitude ≤ 1000 m |
| Core steel | CRGO Laser-Treated Grain-Oriented Silicon Steel (23ZDMH85 / Baosteel B23R085) |
| Bushings / terminals | RIP (Resin Impregnated Paper) Dry Condenser High-Voltage Bushing |

## Standards

- IEC 61378-2
- GB/T 18494.2
- IEEE C57.129
- CESI

## Accessories

**Included:** DC Polarity Reversal Protection System, Fiber Optic Temperature, Multi-Gas DGA
**Optional:** Fire Protection Water Mist System

## Official sources

- https://www.siemens-energy.com/global/en/home/products-services/product-offerings/transformers/power-transformers.html
- https://www.siemensenergy.com/global/en/home/products-services/product-offerings/transformers.html

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

Manufacturer family/application source. Siemens Energy ±800 kV UHVDC converter transformers provide reliable valve-hall coupling for long-distance bulk power DC transmission with composite DC dielectric barrier systems compliant with IEC 61378-2. Exact order code, guaranteed losses, dimensions, insulation level, cooling stage, winding material and project options must be confirmed with the OEM before procurement or an SLD study.

## Pricing & Logistics

- Pricing type: RFQ (Project Engineering) - Indicative range: $3,200,000 – $3,900,000 USD
- Delivery time: 2–8 weeks (may vary depending on technical configuration, factory capacity and destination) - Warranty: 60 months
- Compliance candidates: IEC 61378-2, GB/T 18494.2, IEEE C57.129, CESI. 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-SIE-HVDC-400M-800K","quantity":1}]}
```

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