# Hitachi Energy BESS Power-Conversion Transformer 2500 kVA 35/0.69 kV

> PCS-coupled BESS transformer family for bidirectional inverter duty and cyclic loading.

> SKU: VF-HE-BESS-2500-35 | 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-2500-kva-35-kv-bess-power-conversion-transformer - markdown version: https://voltformer.com/product/hitachi-energy-2500-kva-35-kv-bess-power-conversion-transformer.md

## Overview

Hitachi Energy BESS Power-Conversion Transformer 2500 kVA 35/0.69 kV is intended for 2.5 MW / 5 MWh Containerized BESS Grid Integration. Configured electrical data: 2500 kVA, 35/0.69 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 | 2500 kVA |
| Primary / secondary voltage | 35 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 | 1.65 kW |
| Load loss Pk | 14.5 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:** Temperature monitoring, Pressure relief device
**Optional:** Natural ester fluid, Online monitoring, Inverter harmonic study package

## Official sources

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

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

Manufacturer family/application source. Hitachi Energy documents BESS power-conversion transformers as application-specific dry-type or liquid-filled units integrated with PCS blocks and designed for harmonics, fast switching and cyclic loading. The 35/0.69 kV envelope is a project selection. 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-2500-35","quantity":1}]}
```

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