High-Performance 22kV Dry-Type Transformer Supports Czech BESS Development

Project Background

As the Czech Republic accelerates its development in renewable energy, large-scale Battery Energy Storage Systems (BESS) have become essential for improving grid flexibility and supporting renewable integration.
To support one of the region’s major energy storage stations, Diteli Electric supplied a key 22kV dry-type transformer, playing a fundamental role in the safe and stable operation of the entire BESS facility.

Solution Overview

The 22kV dry-type transformer is directly connected between the energy storage inverter system and the medium-voltage grid.
Its main responsibilities include:

  • Bidirectional power conversion

  • Electrical isolation

  • Ensuring safe charging and discharging cycles

To address the high-frequency operation and rapid charge–discharge characteristics of energy storage systems, Diteli Electric engineered this transformer with enhanced overload capacity and improved impact resistance—specifically tailored for BESS applications.

Key Technical Features

1. Optimized for Energy Storage Applications

  • Designed for high-frequency charge/discharge

  • Reinforced short-time overload capability

  • Stable electromagnetic performance even under fluctuating load profiles

2. Epoxy Cast Dry-Type Structure

  • High fire resistance

  • No oil leakage or pollution

  • Safe for indoor installation

  • Maintenance-friendly design

The transformer uses an epoxy resin cast-coil structure, ensuring excellent insulation, moisture resistance, and long-term reliability—making it suitable for enclosed BESS container environments.

3. Reliable & High-Stability Operation

  • Low partial discharge

  • High dielectric strength

  • Excellent temperature rise control

These features ensure smooth, stable operation and safeguard the energy storage station’s round-the-clock power output.

Project Outcome

The 22kV dry-type transformer has become a core component of the Czech energy storage station, enabling:

  • Smooth renewable energy output

  • Effective participation in grid peak shaving

  • Frequency regulation support

  • Stable energy dispatch during high-demand cycles

Its outstanding electrical performance and safety design ensure continuous, reliable operation of the entire BESS facility.

Conclusion

Through this project, Diteli Electric continues to demonstrate its technical capability and product reliability in the global energy storage market.
The customized 22kV dry-type transformer not only meets the Czech Republic’s strict engineering standards, but also provides strong support for the region’s clean energy transformation and grid modernization.