| Brand | Vziman |
| Model NO. | Oil Immersed distributionTransformer original Manufacturer 11kV-15.5kV |
| Rated voltage | 15kV |
| Rated frequency | 50/60Hz |
| Rated capacity | 315kVA |
| Series | S11 |
This oil-immersed three-phase distribution transformer is a high-performance step-down transformer designed for medium and low voltage distribution networks. With high voltage side covering 11kV to 15.5kV and rated capacity up to 2500 kVA (larger capacities available upon project request), it is suitable for a wide range of medium and low voltage distribution applications worldwide. The transformer uses PCB-free mineral oil as the cooling medium and grain-oriented silicon steel sheet as the core material, with copper windings, effectively enhancing insulation, heat dissipation, and energy efficiency.
The product is designed and manufactured in strict accordance with IEC 60076-1, with an insulation system (transformer oil + insulating paper) compliant with IEC requirements. Every unit undergoes 100% routine factory testing and has maintained a zero-fault delivery record for over 10 years. Suitable for 50 Hz or 60 Hz distribution systems and outdoor installation, the product provides a safe, reliable, and efficient voltage transformation solution for distribution grids worldwide.
| Item | Parameter |
|---|---|
| Type | Oil-Immersed Distribution Transformer |
| Rated Power | Up to 2500 kVA (larger capacities available upon project request) |
| Primary Voltage | 11kV, 13.2kV, 13.8kV, 15kV, 15.5kV |
| Secondary Voltage | 0.4 kV and above (customizable) |
| Frequency | 50 Hz / 60 Hz |
| Phase | Three-phase |
| Cooling Type | ONAN |
| Winding Material | Copper |
| Vector Group | Dyn11 (or as required) |
| Impedance | Per IEC 60076-1 |
| Tap Changer | NLTC (No-Load Tap Changer) |
| Tapping Range | ±2 × 2.5% (Primary Side) |
| Temperature Rise Limits | Top oil 60 K, winding 65 K |
| Insulation System | Transformer oil + insulating paper, IEC compliant |
| Accessories | Oil level gauge, temperature indicator, pressure relief valve (configured per project requirements) |
We offer a 10-year factory warranty for this series of oil-immersed distribution transformers. When the transformer is installed correctly and operated within the specified environmental and load conditions in accordance with IEC standards, any failures caused by manufacturing defects, raw material flaws or workmanship issues will be covered under warranty.
During the warranty period, we provide free technical consultation, fault diagnosis and corresponding after-sales solutions. All our transformers undergo 100% routine factory testing before delivery, backed by our more than 10-year zero-fault delivery record. We also provide lifelong paid maintenance and spare parts supply services to support the long-term safe operation of your power distribution system.
Yes. After production, we will provide factory routine test report, general arrangement drawing, wiring diagram and user manual. Third-party inspection and certification can also be arranged upon your request.
Standard accessories include oil level gauge, temperature indicator and pressure relief valve. We can adjust the accessory configuration according to your project requirements.
In accordance with the IEC standard, the top oil temperature rise limit is 60K, and the winding temperature rise limit is 65K. This design ensures safe and stable long-time continuous operation under rated load.
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