35kV oil‑immersed power transformers covers 1000–10000kVA with ONAN/ONAF dual cooling, delivering high efficiency, energy saving and stable operation.
Designed in compliance with national and IEC standards, the transformers feature reliable insulation, low losses and flexible voltage regulation, suitable for power grids, industrial and mining enterprises, new energy stations and other applications.
Compact in structure and easy to maintain, the equipment ensures long‑term safe operation, providing stable and economical voltage conversion and power transmission for medium‑ and high‑voltage distribution systems.
| Rated Power | 1000kVA, 2000kVA, 3150kVA, 4000kVA, 5000kVA, 6300kVA, 8000kVA, 10000kVA |
| Rating Primary Voltage | 35kV ±2×2.5% or 35kV ±3×2.5% |
| Secondary Voltage | 6.3kV, 10.5kV, 11kV, 20kV |
| Frequency | 50Hz (60Hz available on request) |
| Vector Group | Dyn11 / YNd11 (standard: Dyn11) |
| Winding Material | High-purity oxygen-free copper (Cu) |
| Efficiency | ≥98.0% – 99.7% (increases with rated power) |
| Enclosure material | Carbon steel tank with anti-corrosion paint |
35kv power transformer adopts a fully sealed oil-immersed structure with ONAN / ONAF dual cooling modes as standard. Power transformer covers 1000kVA to 10000kVA, features lower temperature rise and strong overload capacity, and is highly stable for 35kV power grid applications.
Power transformer is designed and manufactured in strict accordance with IEC 60076, GB/T 1094 and other international and national standards. Equipped with a high-grade insulation system, it meets requirements for power frequency withstand voltage, induced withstand voltage and lightning impulse, and features excellent short-circuit withstand strength for reliable operation.
High-quality transformer oil with low freezing point and high breakdown strength is adopted . The transformer is well sealed, leak proof and fire-safe, suitable for long-term operation in outdoor and industrial environments.
High-quality grain-oriented cold-rolled silicon steel sheets and high-purity oxygen-free copper conductors, with low loss and low noise. Designed service life is ≥30 years under normal working conditions. Each unit undergoes complete type tests and routine tests before delivery to ensure stable quality.
are fully stocked. The repair process is clear with transparent costs, and lifetime technical service is supported.
Our factory is equipped with professional automatic production lines and complete testing equipment for 35kV power transformers, including:
The standard production lead time for 1000kVA–10000kVA ONAN/ONAF transformers is normally 30–45 days after receiving the deposit and confirming all technical details.The exact lead time depends on order quantity, voltage configuration and production schedule.
Standard accessories (basic configuration included):
Optional accessories (extra cost, customized):
Yes, we support customized design and production according to customer requirements, such as:
35kV oil immersed transformer is normally transported as a complete unit by truck, container or break bulk vessel, with proper fixing and shockproof protection to ensure stability during long distance delivery.
