| Core Overview |
Uses insulating oil for heat dissipation and insulation. It is the most mature, reliable and widely used power distribution equipment in power grids. |
Provides comprehensive customized design according to the project location environment, special power grid requirements and cost budget. |
| Rated Capacity |
Common range: 30kVA to 20MVA or higher. |
Non-standard capacity customization can be carried out according to load calculation. |
| Voltage Class |
Primary side: 10kV, 11kV, 35kV, etc.; Secondary side: 0.4kV, 6.3kV, etc. |
Supports voltage design conforming to any global standard, meeting the requirements of special input-output voltage ratio. |
| Frequency |
50Hz or 60Hz |
Can be designed as 50/60Hz universal type or adapted to specific frequency requirements. |
| Phase Number |
Three-phase (mainstream), single-phase |
Provides single-phase, three-phase or special phase combination transformers. |
| Connection Group |
Common groups such as Dyn11, Yyn0, YNd11, etc. |
Any connection group can be customized according to system grounding mode, harmonic suppression and other requirements. |
| Performance and Loss |
Complies with IEC standards and provides different energy efficiency levels (e.g., S11, S13). |
The design can be optimized to achieve specific energy efficiency levels (e.g., meeting China's Level 1 energy efficiency) and pursue lower no-load and load losses. |
| Winding Material |
Electrolytic copper (mainstream) or electrical aluminum (lower cost). |
Optional according to performance and cost budget, and can specify conductor purity or special alloys. |
| Core Material |
High-quality cold-rolled grain-oriented silicon steel sheet. |
Can be upgraded to high magnetic permeability silicon steel or amorphous alloy core, greatly reducing no-load loss. |
| Cooling Method |
Oil-immersed self-cooled (ONAN) is the most common. |
Can customize enhanced cooling methods such as oil-immersed air-cooled (ONAF) and forced oil circulation air-cooled (OFAF) according to heat dissipation needs. |
| Tank Structure |
Standard corrugated or finned tank. |
Customizable fully sealed type (maintenance-free), type with expander, or special shape to meet space constraints. |
| Outlet Method |
Standard bushing outlet. |
Can customize cable box outlet, busbar bridge connection, or American/European prefabricated interface. |
| Protection Level |
Outdoor design, usually IP23. |
Can be customized up to IP55 and above for occasions with extremely high dust and waterproof requirements. |
| Climate Protection |
Suitable for general outdoor environment. |
Special treatments such as wind and sand resistance, salt spray resistance (for coastal areas), mold resistance (for hot and humid areas), plateau type (for high-altitude areas), etc. |
| Fire Protection Requirements |
Uses mineral insulating oil. |
Can be filled with high ignition point synthetic resin insulating oil to meet higher fire safety standards. |
| Environmental Protection Requirements |
Standard mineral oil is recyclable. |
Provides transformers with biodegradable natural ester insulating oil to meet the most stringent environmental protection requirements. |
| Certification and Standards |
Complies with IEC standards and routine factory tests. |
Can obtain specific national certifications (e.g., UL, CE, CSA, GOST-R) according to the target market, and provide type test reports issued by third-party authoritative institutions. |
