1. Installation Conditions: Outdoor
2. Model: S Series
3 Capacity: 1,000–8,000 kVA
4. Rated Voltage:
High Voltage (kV): 10, 11, 20, 22, 33, 34.5, 35, 36.5, 37, 38.5
Low Voltage (kV): 0.4, 0.6, 0.69, 0.8
Custom specifications are supported.
5. Impedance: 4.5–10%
6. Insulation Class: Class A
7. Vector Group: Dy11
8. Insulation Level: 35 kV: LI 170 AC 70 / AC 5
9. Compliance Standards: EN 60076, IEC 60076, CE
The Oil-Immersed ESS Transformer is a key component in Battery Energy Storage Systems (BESS), enabling
bidirectional energy transfer and voltage conversion between the grid and battery system.
During charging, it steps down grid voltage for the PCS (Power Conversion System); during discharging, it steps up the PCS output to grid voltage levels.
As the core link between the battery and the grid, this transformer is vital to ensuring the
efficiency, safety, and stability of the entire storage system.
Engineered for frequent and rapid charge/discharge cycles, maintaining high efficiency and reliability in both directions of energy flow.
Withstands short-term high-current impacts and frequent load fluctuations during peak shaving and frequency regulation.
Built with advanced materials and structural design to resist harmonic currents generated by PCS operation, minimizing localized overheating and extra losses.
Exceeds conventional distribution transformer standards to ensure long-term, stable, and maintenance-free operation in unmanned BESS environments.
No-load and load losses are finely optimized, directly improving round-trip efficiency and maximizing energy storage ROI.
The oil-immersed design provides excellent heat dissipation, extending insulation life even under continuous heavy-load and bidirectional operation.
Low-loss design reduces conversion losses, enhancing charging/discharging efficiency and increasing overall economic returns.
Specialized engineering ensures reliable performance during frequent switching and heavy load changes, maintaining stable operation on both grid and battery sides.
Lower initial investment compared to dry-type transformers and minimal maintenance needs lead to significant TCO savings.
Advanced insulation and cooling systems guarantee a service life of 15–20 years, matching the lifespan of modern energy storage stations.
Sealed oil-immersed design allows reliable operation under extreme environmental conditions, including high temperature, humidity, and altitude.
| Installation Conditions | Outdoor |
| Model | S Series |
| Capacity | 1000–8000 kVA |
| Rated Voltage | HV: 10, 11, 20, 22, 33, 34.5, 35, 36.5, 37, 38.5 kV |
| LV: 0.4, 0.6, 0.69, 0.8 kV (Customizable) | |
| Impedance | 4.5–10% |
| Insulation Class | Class A |
| Vector Group | Dy11 |
| Insulation Level | 35 kV: LI 170 AC 70 / AC 5 |
| Compliance Standards | EN 60076, IEC 60076, CE |
| Customization | Non-standard designs supported |
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