# ABB / Hitachi Energy 7000 kVA 66/0.69 kV Wind Plant (RES) Step-Up Transformers

> Hitachi Energy WindSTAR 7000 kVA 66 kV compact nacelle-installed dry-type wind turbine transformer.

> SKU: VF-ABB-WND-7000-66 | 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-7000-kva-66-kv-wind-turbine-nacelle-transformer - markdown version: https://voltformer.com/product/hitachi-energy-windstar-7000-kva-66-kv-wind-turbine-nacelle-transformer.md

## Overview

ABB / Hitachi Energy 7000 kVA 66/0.69 kV Wind Plant (RES) Step-Up Transformers is intended for Wind-Turbine Tower and Nacelle Power Generation Facilities. Configured electrical data: 7000 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: AN/AF; 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:** Wind-Turbine Tower and Nacelle Power Generation Facilities
- **Target industries:** Offshore Wind Farms, Inside-Turbine Wind Installations (Nacelle / Tower Base), Heavy Coastal, Marine & Shipyard Facilities
- **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 | 7000 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 | 7.20 kW |
| Load loss Pk | 48.0 kW |
| Calculated efficiency (power factor = 1) | 99.2176% at 100% load; 99.4544% at 50% load |
| Loss class | Ecodesign Tier 2 |
| Windings | Copper (Cu-Cu) - cooling: AN/AF - insulation: Class H (180°C) |
| Temperature rise | 100 K - sound pressure: 62 dB(A) |
| Mass and dimensions | 14500 kg - 2950×1750×2650 mm |
| Enclosure | Configuration-specific ingress protection - wheel gauge: 1070 mm |
| LI / AC withstand | 325 kV peak / 140 kV rms - partial discharge: 5 pC |
| Environment | -25°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 60076-11
- IEC 60076-16
- DNVGL-ST-0145

## Accessories

**Included:** PT100 Temperature Sensors (3x Winding + 1x Core), Configuration-specific technical value, Configuration-specific technical value
**Optional:** Configuration-specific technical value, Configuration-specific technical value

## Official sources

- https://www.hitachienergy.com/products-and-solutions/transformers/dry-type-transformers/windstar
- https://www.hitachienergy.com/products-and-solutions/transformers

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

Manufacturer family/application source. Hitachi Energy WindSTAR high-performance dry-type transformers specifically sized and engineered to fit inside the cramped nacelle or tower base of modern 66 kV offshore and onshore wind turbines. 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: $41,000 – $47,500 USD
- Delivery time: 2–8 weeks (may vary depending on technical configuration, factory capacity and destination) - Warranty: 36 months
- Compliance candidates: IEC 60076-11, IEC 60076-16, DNVGL-ST-0145. 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-ABB-WND-7000-66","quantity":1}]}
```

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