# Mingyang 4000 kVA 35/0.69-0.69 kV Bidirectional 4-Quadrant BESS Battery Storage Transformer

> Mingyang 4000 kVA 35/0.69-0.69 kV Bidirectional 4-Quadrant BESS Battery Storage Transformer belongs to the Battery Energy Storage (BESS) Transformers category and is rated at 4000 kVA with 35/0.69 kV primary/secondary voltage. Application: Utility-Scale BESS Battery Storage & Frequency Regulation Parks. Final ratings must be verified against the manufacturer datasheet.

> SKU: VF-MY-BESS-4000-35 | Brand: Mingyang Electrical (Mingyang Group) | Category: Power & Energy Equipment / Transformers / Renewable Energy Transformers (PV, Wind & BESS) / Battery Energy Storage (BESS) Transformers

**Voltformer canonical:** https://voltformer.com/product/mingyang-4000-kva-35-0-69-0-69-kv-bidirectional-4-quadrant-bess-battery-storage-transformer - markdown version: https://voltformer.com/product/mingyang-4000-kva-35-0-69-0-69-kv-bidirectional-4-quadrant-bess-battery-storage-transformer.md

## Overview

Mingyang 4000 kVA 35/0.69-0.69 kV Bidirectional 4-Quadrant BESS Battery Storage Transformer is intended for Utility-Scale BESS Battery Storage & Frequency Regulation Parks. Configured electrical data: 4000 kVA, 35/0.69 kV primary/secondary voltage, 50 Hz, 3-phase, vector group Dyn11-yn11 and short-circuit impedance 7%. Construction: Copper (Cu-Cu); cooling: ONAN/ONAF; loss class: BESS 4-Quadrant High Efficiency. 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:** Utility-Scale BESS Battery Storage & Frequency Regulation Parks
- **Target industries:** Utility-Scale Battery Parks, Frequency Regulation Facilities
- **Brand:** [Mingyang Electrical (Mingyang Group)](https://voltformer.com/brand/mingyang-electrical.md) - Technology giant specialized in renewable energy, wind plants and BESS battery storage transformers; Mingyang produces 66 kV floating offshore step-up transformers and integrated field solar compact k
- **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 | 35 kV / 0.69 kV (±2 x 2.5%) |
| Frequency / phases | 50 Hz / 3-phase - Dyn11-yn11 |
| Short-circuit impedance (Uk) | 7% |
| No-load loss P0 | 2.80 kW |
| Load loss Pk | 26.0 kW |
| Calculated efficiency (power factor = 1) | 99.29% at 100% load; 99.54% at 50% load |
| Loss class | BESS 4-Quadrant High Efficiency |
| Windings | Copper (Cu-Cu) - cooling: ONAN/ONAF - insulation: Class A |
| Temperature rise | 65 K - sound pressure: 59 dB(A) |
| Mass and dimensions | 9800 kg - 2700×1850×2450 mm |
| Enclosure | IP55 - 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 60076-16
- IEC 60076
- TS EN 50708 series

## Accessories

**Included:** DC Bias Protection Circuit, DGPT2 Multifunction Relay, Electrostatic Shield
**Optional:** Ester Oil

## Official sources

- https://mingyang.com.cn/

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

Manufacturer portfolio/family source. Confirm the exact order code, guaranteed ratings and project-specific options against the current OEM datasheet before procurement or an SLD study.

## Pricing & Logistics

- Pricing type: RFQ (On Request) - Indicative range: $49,000 – $58,000 USD
- Delivery time: 2–8 weeks (may vary depending on technical configuration, factory capacity and destination) - Warranty: 36 months
- Compliance candidates: IEC 60076-16, IEC 60076, 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-MY-BESS-4000-35","quantity":1}]}
```

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