Energy Storage Dry-Type Transformer (Open Type) | Safe, Low Loss & High Reliability

Open-Type Dry-Type Transformer for Energy Storage Systems

The Open-Type Dry-Type Transformer for Energy Storage Systems is a high-efficiency, safe, and environmentally friendly solution designed for modern energy storage applications. It is ideal for use in hospitals, smart campuses, PV-storage-charging stations, and data centers. Featuring an oil-free open-type design, it offers excellent insulation performance, low losses, and strong short-circuit withstand capability. With efficient heat dissipation and low-noise operation, the transformer adapts well to complex environments and supports both natural air cooling (AN) and forced air cooling (AF).

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Scope of application

Commercial & Industrial Energy Storage

Suitable for park-level energy storage stations, with a focus on system integration and high heat dissipation efficiency.

PV-Storage-Charging Stations

Ideal for EV charging stations with integrated energy storage, featuring low loss and low noise operation.

Data Center Peak Shaving

Designed for on-site energy storage and load balancing, ensuring high reliability and easy maintenance.

Product Description

1 Open, non-encapsulated winding structure ensures excellent heat dissipation, strong overload capability, and safe, reliable operation.

2 Equipped with DuPont™ Nomex® VPI (Vacuum Pressure Impregnation) insulation system, featuring a compact and optimized design.

3 Withstands extreme temperatures from -40°C to 220°C, providing strong insulation performance for various energy storage environments.

4 Flame-retardant, non-flammable, and explosion-proof design—ideal for user-side energy storage applications such as hospitals, smart campuses, PV-storage-charging stations, and data centers.

5 Integrated smart transformer terminal with IoT cloud platform support for intelligent monitoring and operation & maintenance.

Product Features

High Safety

Oil-free design eliminates risks of oil leakage and fire hazards, making it ideal for safety-critical applications such as hospitals and data centers.

Excellent Insulation Performance

Uses high-quality insulation materials with Class F or Class H insulation, ensuring reliable performance in high-temperature and high-humidity environments.

Strong Short-Circuit Resistance

HV and LV windings adopt continuous and foil-type structures with VPI treatment, delivering excellent short-circuit and mechanical impact resistance.

Efficient Cooling

Supports natural air cooling (AN) and forced air cooling (AF), providing effective heat dissipation and stable operation under continuous high-load conditions—ideal for energy storage systems.

Low Loss & Energy Efficient

Manufactured with high-permeability grain-oriented silicon steel and advanced 45° step-lap core technology, reducing no-load loss and energy consumption.

Low Noise Operation

Optimized core design with anti-vibration treatment ensures noise levels below 55 dB, suitable for noise-sensitive environments such as hospitals and smart campuses.

Main Parameters

Capacity Range	100 kVA - 5000 kVA
Rated Voltage	Primary Voltage：6 kV、10 kV、35 kV
Insulation Class	Class F or Class H
Cooling Method	Natural Air Cooling (AN) / Forced Air Cooling (AF)
Frequency	50 Hz / 60 Hz
Short-Circuit Impedance	4% - 6%

Implementation Standard

GB/T 1094.1-2013 Power Transformers – Part 1: General Requirements

GB/T 1094.3-2017 Power Transformers – Part 3: Insulation Levels, Dielectric Tests and External Clearances in Air

GB/T 1094.5-2008 Power Transformers – Part 5: Ability to Withstand Short Circuit

GB/T 1094.10-2022 Power Transformers – Part 10: Determination of Sound Levels

GB/T 1094.11-2022 Power Transformers – Part 11: Dry-Type Power Transformers

GB/T 1094.12-2013 Power Transformers – Part 12: Loading Guide for Dry-Type Power Transformers

GB/T 10228-2015 Technical Specifications and Requirements for Dry-Type Power Transformers

Technical Advantages

R&D Cloud Platform

An integrated digital platform combining electromagnetic optimization design, parametric modeling, performance analysis, structural optimization, and automatic drawing generation. It enables efficient resource sharing, along with advanced data management including search, modification, and version control.

Simulation Analysis

Advanced multi-physics simulation covering fluid dynamics, thermal field, electric field, leakage magnetic field, transient processes, and short-circuit forces. Each transformer series is optimized through thermal and flow analysis to accurately control winding temperature rise and hotspot distribution, ensuring superior performance and reliability.

Smart Operation & Maintenance Platform

Equipped with intelligent monitoring by collecting key data such as temperature, current, voltage, vibration, and grid harmonics. The system enables real-time power quality analysis, fault alarms, and supports mobile access for remote monitoring and smart O&M management.