# Hitachi Energy BESS Power-Conversion Transformer 4000 kVA 34.5/0.69 kV

> Higher-capacity Hitachi Energy PCS transformer family for utility-scale BESS blocks.

> SKU: VF-HE-BESS-4000-345 | Brand: ABB / Hitachi Energy | Category: Power & Energy Equipment / Transformers / Renewable Energy Transformers (PV, Wind & BESS) / Battery Energy Storage (BESS) Transformers

**Voltformer canonical:** https://voltformer.com/product/hitachi-energy-4000-kva-34-5-kv-bess-transformer - markdown version: https://voltformer.com/product/hitachi-energy-4000-kva-34-5-kv-bess-transformer.md

## Overview

Hitachi Energy BESS Power-Conversion Transformer 4000 kVA 34.5/0.69 kV is intended for 2.5 MW / 5 MWh Containerized BESS Grid Integration. Configured electrical data: 4000 kVA, 34.5/0.69 kV primary/secondary voltage, 50 Hz, 3-phase, vector group Dyn11 and short-circuit impedance 6.5%. 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:** 2.5 MW / 5 MWh Containerized BESS Grid Integration
- **Target industries:** Grid-Scale Battery Storage (BESS), Frequency Control Stations
- **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. / [Battery Energy Storage (BESS) Transformers](https://voltformer.com/category/renewable-energy-transformers/bess-battery-storage-transformers.md)

## Technical Specifications

| Property | Value |
|---|---|
| Rated power | 4000 kVA |
| Primary / secondary voltage | 34.5 kV / 0.69 kV (±2 x 2.5%) |
| Frequency / phases | 50 Hz / 3-phase - Dyn11 |
| Short-circuit impedance (Uk) | 6.5% |
| No-load loss P0 | 2.64 kW |
| Load loss Pk | 23.2 kW |
| Calculated efficiency (power factor = 1) | 99.3581% at 100% load; 99.5798% at 50% load |
| Loss class | Ecodesign Tier 2 |
| Windings | Copper (Cu-Cu) - cooling: ONAN - insulation: Class A |
| Temperature rise | 65 K - sound pressure: 55 dB(A) |
| Mass and dimensions | 6900 kg - 2300×1400×2250 mm |
| Enclosure | IP54 - wheel gauge: 1070 mm |
| LI / AC withstand | 170 kV peak / 70 kV rms - partial discharge: 5 pC |
| Environment | -25°C / +40°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
- IEEE C57
- TS EN 50708 series

## Accessories

**Included:** PCS interface, Temperature monitoring, Pressure relief device
**Optional:** Natural ester fluid, Online monitoring, Grid-forming control interface

## Official sources

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

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

Manufacturer family/application source. Hitachi Energy documents solar and BESS transformer applications designed for inverter harmonics, cyclic loading and PCS integration. The 4000 kVA, 34.5/0.69 kV envelope is project configured and not an exact 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: $34,500 – $41,000 USD
- Delivery time: 2–8 weeks (may vary depending on technical configuration, factory capacity and destination) - Warranty: 36 months
- Compliance candidates: IEC 60076, IEEE C57, TS EN 50708 series. 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-BESS-4000-345","quantity":1}]}
```

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