# Hitachi Energy WindSTAR 6000 kVA 66/0.69 kV Offshore Wind Transformer

> Offshore wind turbine transformer family for 66 kV collector systems and harsh marine environments.

> SKU: VF-HE-WINDSTAR-6000-66 | Brand: ABB / Hitachi Energy | Category: Power & Energy Equipment / Transformers / Renewable Energy Transformers (PV, Wind & BESS) / Wind Plant (RES) Step-Up Transformers

**Voltformer canonical:** https://voltformer.com/product/hitachi-energy-windstar-6000-kva-66-kv-offshore-wind-transformer - markdown version: https://voltformer.com/product/hitachi-energy-windstar-6000-kva-66-kv-offshore-wind-transformer.md

## Overview

Hitachi Energy WindSTAR 6000 kVA 66/0.69 kV Offshore Wind Transformer is intended for 6-8 MW Offshore Wind Turbine Tower / Platform Step-Up. Configured electrical data: 6000 kVA, 66/0.69 kV primary/secondary voltage, 50 Hz, 3-phase, vector group Dyn11 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:** [ABB / Hitachi Energy](https://voltformer.com/brand/abb-hitachi-energy.md) - Global leader in high-voltage power grids and critical industrial infrastructure; Hitachi Energy delivers Resibloc® glass-fibre reinforced dry-type, TrafoStar™ large power transformers and EcoDry seri
- **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 | 6000 kVA |
| Primary / secondary voltage | 66 kV / 0.69 kV (±2 x 2.5%) |
| Frequency / phases | 50 Hz / 3-phase - Dyn11 |
| Short-circuit impedance (Uk) | 8.5% |
| No-load loss P0 | 3.40 kW |
| Load loss Pk | 32.0 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:** Offshore corrosion protection, Temperature monitoring, Vibration/transport qualification
**Optional:** Natural ester, TXpert monitoring, Floating-wind configuration

## Official sources

- https://www.hitachienergy.com/us/en/products-and-solutions/transformers/by-customer-segment/transformers-for-offshore-wind-power
- https://www.hitachienergy.com/products-and-solutions/transformers

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

Manufacturer family/application source. Hitachi Energy documents WindSTAR transformers and 66 kV offshore wind applications, including natural-ester and floating solutions. Final turbine interface, rating, cooling and insulation levels are selected per OEM project. 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-HE-WINDSTAR-6000-66","quantity":1}]}
```

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