1. Installation Conditions: Outdoor
2. Model: S, SZ Series
3. Capacity Range: 30–31,500 kVA
4. Rated Voltage:
High Voltage (kV):
6, 6.6, 10, 11, 12.47, 13.2, 13.8, 15, 20, 22, 25, 33, 34.5, 35, 38.5
Low Voltage (kV):
0.38, 0.4, 0.415, 0.433, 0.48, 0.69, 0.72
Custom specifications are supported.
5. Impedance: 4–10%
6. Insulation Class: Class A
7. Vector Group: Dyn11, Yyn0, Yd11, YNd11
8. Insulation Level:
10kV: LI75 AC35 / AC5
20kV: LI125 AC50 / AC5
35kV: LI170 AC70 / AC5
The oil-immersed PV transformer is a key power transmission and distribution device widely used in photovoltaic (PV) power stations. It is typically installed in pad-mounted substations (PV-compatible compact substations) or used as a standalone unit. Its main function is to step up the medium-voltage output of PV inverters (such as 0.8 kV or 35 kV) to higher grid transmission voltages (such as 35 kV or 110 kV), ensuring efficient and stable grid integration. As the “gateway” of solar power plants, the PV transformer plays a vital role in delivering clean, renewable energy to the grid.
High-Temperature Resistance: Designed for significant daily temperature fluctuations in solar farms, with transformer oil and insulation system providing excellent endurance in high-heat conditions.
Strong Overload Capacity: Supports full-load and short-term overload operation during peak sunlight, as well as no-load operation at night.
Harmonic Handling: Specially engineered to withstand harmonic currents generated by PV inverters, reducing risk of local overheating.
Superior Sealing: Fully sealed construction with pressure relief devices prevents moisture, dust, and salt spray intrusion, suitable for desert and coastal environments.
Energy-Efficient Design: Optimized for low no-load loss at night and reduced load loss during the day, aligning with PV station efficiency requirements.
High Reliability: Durable construction and premium materials ensure long-term stable performance in unmanned PV power stations.
| Specification | Details |
| Installation Conditions | Outdoor installation |
| Model | S-Series |
| Rated Capacity | 1,000–8,000 kVA |
| Rated Voltage | High Voltage (kV): 10.5, 33, 34.5, 35, 36.5, 37, 38.5 |
| Low Voltage (kV): 0.4, 0.8, 1.14 | |
| Custom specifications available | |
| Impedance | 6.5–10% |
| Insulation Class | Class A |
| Vector Group | Dy11, Yd11 |
| Insulation Level | 35 kV: LI170 AC70 / AC5 |
| Compliance Standards | EN 60076, IEC 60076, CE |
Cost-Effective: Compared to dry-type transformers, oil-immersed transformers provide lower manufacturing and procurement costs at equivalent capacity, making them ideal for large and medium-sized PV stations.
Minimal Maintenance, Long Service Life: Rugged sealed structure and stable oil-paper insulation system ensure maintenance-free operation and service life of over 25 years.
High Efficiency: Reduced no-load and load losses decrease internal power consumption, boosting energy yield and improving return on investment (IRR).
Strong Environmental Adaptability: Excellent heat dissipation and sealing allow reliable performance in deserts, hills, coastal sites, and high-altitude regions.
Safe and Reliable: Equipped with protective devices such as pressure relief valves and gas relays, ensuring safe and stable grid-connected power generation.
