# Siemens Energy GEAFOL Wind 3400 kVA 34.5/6/0.69 kV Three-Winding Transformer

> Published GEAFOL Wind three-winding transformer envelope for doubly-fed wind turbine applications.

> SKU: VF-SIE-GEO-WIND-3400-345 | Brand: Siemens Energy | Category: Power & Energy Equipment / Transformers / Renewable Energy Transformers (PV, Wind & BESS) / Wind Plant (RES) Step-Up Transformers

**Voltformer canonical:** https://voltformer.com/product/siemens-geafol-wind-3400-kva-three-winding-transformer - markdown version: https://voltformer.com/product/siemens-geafol-wind-3400-kva-three-winding-transformer.md

## Overview

Siemens Energy GEAFOL Wind 3400 kVA 34.5/6/0.69 kV Three-Winding Transformer is intended for 6-8 MW Offshore Wind Turbine Tower / Platform Step-Up. Configured electrical data: 3400 kVA, 34.5/6 kV primary/secondary voltage, 50 Hz, 3-phase, vector group Özel Bağlantı and short-circuit impedance 8.5%. Construction: Copper (Cu-Cu); cooling: ONAN; loss class: Ecodesign Tier 2. 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:** 6-8 MW Offshore Wind Turbine Tower / Platform Step-Up
- **Target industries:** Offshore Wind Power Plants, Coastal Wind Farms
- **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** / [Renewable Energy Transformers (PV, Wind & BESS)](https://voltformer.com/category/renewable-energy-transformers.md): Multi-winding, harmonic-tolerant step-up transformers for solar (PV), wind and battery storage (BESS) plants. / [Wind Plant (RES) Step-Up Transformers](https://voltformer.com/category/renewable-energy-transformers/wind-farm-step-up-transformers.md)

## Technical Specifications

| Property | Value |
|---|---|
| Rated power | 3400 kVA |
| Primary / secondary voltage | 34.5 kV / 6 kV (HV tap changer - project configured) |
| Frequency / phases | 50 Hz / 3-phase - special connection |
| Short-circuit impedance (Uk) | 8.5% |
| No-load loss P0 | 1.93 kW |
| Load loss Pk | 18.1 kW |
| Calculated efficiency (power factor = 1) | 99.4135% at 100% load; 99.6214% at 50% load |
| Loss class | Ecodesign Tier 2 |
| Windings | Copper (Cu-Cu) - cooling: ONAN - insulation: Class K (300°C flame-resistant) |
| Temperature rise | 65 K - sound pressure: 64 dB(A) |
| Mass and dimensions | 14500 kg - 3100×1850×2950 mm |
| Enclosure | IP56 / C5-M marine certified - wheel gauge: 1070 mm |
| LI / AC withstand | 325 kV peak / 140 kV rms - partial discharge: 5 pC |
| Environment | -40°C / +50°C; altitude ≤ 1000 m |
| Core steel | CRGO Laser-Treated Grain-Oriented Silicon Steel (23ZDMH85 / Baosteel B23R085) |
| Bushings / terminals | Direct Copper Busbar Terminals (Busbar Integrated / IP00-IP31) |

## Standards

- IEC 60076-16
- DNV GL Offshore Standard
- ISO 12944 C5-M

## Accessories

**Included:** Wind vibration qualification, PT100 sensors, Cast-resin dry-type construction
**Optional:** Electrostatic shield, Offshore corrosion class, Special tertiary winding

## Official sources

- https://assets.siemens-energy.com/dam/3457c5ba-7d07-4aac-80e6-b05800968f1e/GEAFOLforWind-pdf_Original%20file.pdf
- https://www.siemensenergy.com/global/en/home/products-services/product-offerings/transformers.html

- **Source scope:** exact-order-code
- **Last reviewed:** 2026-09-13

Manufacturer family/application source. Siemens Energy’s GEAFOL Wind brochure publishes a 3400 kVA, 34.5 kV/6 kV/690 V three-winding windfarm transformer scope with ONAN cooling, 65 K rise and IEEE construction basis. Confirm the exact winding connection and order code. 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 (On Request) - Indicative range: $85,000 – $98,000 USD
- Delivery time: 2–8 weeks (may vary depending on technical configuration, factory capacity and destination) - Warranty: 36 months
- Compliance candidates: IEC 60076-16, DNV GL Offshore Standard, ISO 12944 C5-M. 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-GEO-WIND-3400-345","quantity":1}]}
```

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