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The energy storage transformer is the core power conversion and interface device in an energy storage system, specifically designed to handle bidirectional power flow, frequent charge/discharge cycles, high harmonic content, and high safety requirements in energy storage applications.
The energy storage transformer is the key device in electrochemical energy storage systems for bidirectional power transmission, voltage conversion, electrical isolation, and grid-connection interfacing. It is mainly used in grid-side storage, renewable energy paired storage, commercial and industrial user-side storage, and microgrids. Compared with conventional distribution transformers, it is specially optimized for bidirectional power flow, frequent charge/discharge cycling, high harmonics, high reliability, and high safety in energy storage operations.
• Maximum charge/discharge power for energy storage systems, commonly 500, 1000, 1250, 2500, 3150kVA, etc.
• Ensures harmonic withstand capability, grounding performance, and stable bidirectional operation.
• Zero-maintenance design
• 3-year warranty
Product Features
Supports bidirectional energy transfer from grid to battery (charging) and battery to grid (discharging), with symmetrical winding and magnetic circuit design
Suited to frequent start-stop operation and multiple daily charge/discharge cycles, with fatigue resistance and thermal expansion/contraction resistance far beyond conventional distribution transformers
Handles severe power fluctuations in frequency regulation and peak shaving, with short-term overload capability of 1.2–1.5 times
Fully sealed, vacuum varnish-impregnated / cast design suitable for unattended power stations.
Technical Parameters
| Energy Storage Transformer | |
| Model | Energy Storage Transformer |
| Rated Capacity | 50kVA–3000kVA |
| Input Voltage | 690V / 800V / 10kV ±10% |
| Output Voltage | 400V / 480V ±1% |
| Frequency | 50Hz / 60Hz (dual-frequency compatible) |
| Phase | 3-phase |
| Vector Group | Dyn11 |
| Impedance | 4%–6% |
FAQ
An energy storage transformer is a specialized transformer designed for bidirectional conversion, frequent charging/discharging, harmonic resistance, and impact resistance.
Ordinary transformers are designed for one-way power supply. In energy storage use, they may face:
High loss and severe heating during reverse operation
Excessive temperature rise and faster insulation aging caused by harmonics
Partial discharge and shortened life under frequent start-stop operation
Safety risks and non-compliance with energy storage grid-connection requirements
Dyn11 is preferred.
Strong harmonic suppression capability
Suitable for non-linear loads (PCS)
Good adaptability to three-phase imbalance
It is the mainstream standard connection for energy storage, PV, and wind power systems.
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