Leave Us a Message
Whether you require a quote, have questions or need assistance, our team is ready to provide expert guidance.
Three-Phase Dual Winding Power Transformer
Three-Phase Dual Winding Power Transformer is a critical component in modern electrical power systems designed for efficient voltage conversion between two distinct voltage levels in three-phase networks. Featuring two independent winding sets—typically one high-voltage (HV) and one low-voltage (LV)—this transformer enables reliable step-up and step-down of electrical power while providing excellent electrical isolation, enhanced stability, and protection for connected equipment.
This transformer type is widely utilized in transmission and distribution grids, substations, and industrial power systems to adapt voltage levels between generation, transmission, and utilization points. Its design meets stringent international standards for safety, efficiency, and durability, ensuring long-term performance under varying load conditions.
SHARE:
Working Principle
Three-phase dual winding power Transformer operates on the electromagnetic induction principle, where alternating current in the high-voltage winding creates a changing magnetic flux in the core. This flux then induces a corresponding voltage in the low-voltage winding, scaled according to the designed turn ratio. The physical separation of the coils ensures safety and electrical isolation between circuits, while the core structure achieves efficient magnetic coupling.
Key Features & Advantages
Dual Winding Configuration
The transformer includes two separate winding systems—primary (high voltage) and secondary (low voltage)—wound on a shared magnetic core. This enables efficient power transfer through electromagnetic induction while maintaining electrical isolation between circuits.
Voltage Conversion Capability
With accurate turn ratios and robust design, the transformer supports both voltage step-up and step-down operations to suit different levels of energy transmission and consumption, making it versatile for power grid planning and operation.
Enhanced Reliability & Safety
Independent windings and sealed construction improve safety and reduce risks associated with electrical faults. The isolation between windings minimizes the impact of disturbances on one voltage level from affecting the other.
Flexible Voltage Levels
Available in a wide range of high-voltage and low-voltage combinations, such as 220 kV/33 kV, 110 kV/10 kV, etc., these transformers can be tailored to project requirements in transmission and distribution networks. (Reference models vary per manufacturer.)
Strong Mechanical & Thermal Design
Built with high-quality core materials (like cold-rolled silicon steel) and precision-wound copper or aluminum conductors, the transformer delivers low losses, strong short-circuit resistance, and reliable thermal performance under rated loads.
Applications
The Three-Phase Dual Winding Power Transformer is widely used in:
✔ Electric Power Transmission Systems – Connecting high-voltage transmission lines with medium-voltage distribution networks.
✔ Substations – Transforming voltage levels between regional grid sections or utility interfaces.
✔ Industrial Complexes – Providing required voltage for heavy electrical loads and machinery.
✔ Renewable and Mixed Generation Sites – Linking generation equipment (such as wind or solar farms) to the main grid with suitable transformation stages.
Technical Parameters
| Rated Capacity | 5 MVA – 200 MVA+ (customizable) |
|---|---|
| Primary (HV) Voltage Level | 66 kV / 110 kV / 220 kV (or other per project) |
| Secondary (LV) Voltage Level | 10 kV / 33 kV / 35 kV (or customer-defined) |
| Frequency | 50 Hz / 60 Hz |
| Cooling Method | ONAN (Oil Natural Air Natural), ONAF (Oil Natural Air Forced), etc. |
| Winding Material | Copper or Aluminum |
| Vector Group | Dyn11, Yyn0, etc. (based on system needs) |
| Impedance Voltage | Typically ~5 % (varies with specification) |
| Insulation Medium | Mineral oil with high dielectric strength |
| Standards Compliance | IEC 60076 and other regional standards |
Note: Actual ratings depend on specific customer requirements and grid design parameters.
