Home > SCB Cast Resin Dry Type Energy Storage Transformer (800-25000 kVA)
Product Overview:
The Cast Resin Dry Type Energy Storage Transformer is specialized core electrical equipment designed exclusively to seamlessly integrate with wind, photovoltaic (PV), and Battery Energy Storage Systems (BESS). Serving as the critical bridge between distributed generation and the grid, this transformer resolves the innate voltage mismatch and electrical isolation requirements of modern renewable grids.
Featuring an advanced dual-split low-voltage winding architecture, it efficiently manages the volatile, bidirectional power flow typical of energy storage cycles. Designed for utmost safety, it utilizes vacuum-cast epoxy resin, making it 100% fire-retardant and highly resilient against the severe harmonic distortions and grid impacts inherent in renewable energy operations.
Key Advantages:
• Specifically engineered for the rigorous demands of BESS, wind, and solar PV integrations
• Unique dual-split low voltage winding design minimizes footprint and equipment costs
• Outstanding capability to withstand sudden short circuits and extreme grid impacts
• Integrates an advanced smart temperature controller for real-time monitoring and safety
• Up to 30% overload capacity under forced air cooling (AF) for peak shaving operations
| TECHNICAL PARAMETERS (ENERGY STORAGE TRANSFORMER) | |
|---|---|
| Installation Environment | Indoor |
| Rated Capacity | 800 - 25000 kVA |
| Rated Voltage (HV) | 10, 20, 35 kV |
| Rated Voltage (LV) | 0.69, 0.72, 1.14 kV |
| Impedance (%) | 6 - 10 |
| Insulation Class | Class F / Class H |
| Vector Group | Dyn11 |
| Insulation Level (10kV / 20kV / 35kV) | LI75AC35/AC5; LI125AC50/AC5; LI170AC70/AC5 |
| Execution Standards | GB/T 10228-2023, GB/T 1094.11-2022 |
Battery energy storage systems and high-capacity PV inverters require specialized coupling. This energy storage transformer utilizes a sophisticated low-voltage dual-split winding design. Instead of requiring two separate transformers, a single core operates two galvanically isolated low-voltage circuits. This drastically reduces the physical footprint, lowers the overall cost of the substation, and effectively decouples the inverters, significantly mitigating harmonic interference and circulating currents between parallel inverter modules.
Renewable energy generation and battery storage operations are characterized by sudden, massive bidirectional power shifts (charging and discharging). To combat the immense electro-dynamic forces these shifts create, the coils are cast in an imported epoxy resin under deep vacuum. The resulting solid, monolithic resin block provides extraordinary mechanical strength, ensuring the coils will never deform or fail during sudden short-circuit events or extreme grid impacts.
Energy storage systems often run unmanned and require high operational intelligence. The transformer is equipped with a comprehensive temperature control matrix. PT100 platinum resistance thermistors embedded directly within the low-voltage coils provide continuous, real-time thermal data. The smart controller offers automatic fan start/stop, hottest-phase display, over-temperature alarms, and automatic safety tripping. It also features RS485 communication interfaces for seamless integration into the BESS SCADA system.
The integrity of the insulation is paramount, especially when subjected to the high-frequency voltage ripples produced by PCS (Power Conversion Systems). By utilizing the vacuum casting process, air bubbles are entirely eliminated from the resin matrix. This ensures the cast resin dry type transformer maintains a partial discharge level of less than 5pC, dramatically slowing insulation aging and ensuring a decades-long, maintenance-free service life.
Energy storage applications frequently demand rapid, high-power bursts for frequency regulation or peak shaving. Built with premium Class F or Class H insulation materials, this transformer handles 100% capacity under Natural Air (AN) cooling. However, when equipped with its forced air cooling system (AF), it can safely sustain an overload of up to 130% for extended periods, providing BESS operators with crucial operational flexibility during critical grid demand windows.
Standard transformers are designed for steady, unidirectional power flow. Energy storage systems (BESS) require transformers that can handle aggressive, bidirectional power cycling (charging and discharging), high-frequency harmonics from inverters, and sudden grid impacts. Our specialized transformers are mechanically reinforced and magnetically optimized to survive these extreme conditions.
The dual-split low voltage design allows two independent inverters to connect to a single transformer core while remaining electrically isolated. This saves significant space and cost compared to buying two separate transformers, which is a critical advantage when designing compact energy storage plants.
The dual-split configuration inherently provides high decoupling impedance between the two low-voltage windings. This prevents the circulating currents and harmonic resonance that typically occur when multiple inverters are paralleled, ensuring clean, stable power transmission to the high-voltage grid.
Yes, it is the ideal choice. Because it is a cast resin dry type transformer, it contains no oil and poses zero fire risk, eliminating the need for complex fire suppression systems inside the container. Its compact footprint, combined with its high resilience to vibrations and shocks, makes it perfectly suited for tight integration into prefabricated BESS containers.
