The 35kV three-phase oil-immersed distribution transformer is a high-efficiency power solution compliant with ANSI C57.12.00, IEC 60076, and GB standards. Featuring advanced C.R.G.O. silicon steel cores and oxygen-free copper windings, it delivers ultra-low losses (S11-M series achieves 30% reduction vs. S9-M). The sealed tank design with corrugated/expansion radiators eliminates oil oxidation, extending service life while reducing maintenance.

Ideal for utility and industrial applications, its mitered core structure ensures quiet operation (<65dB) and enhanced safety. The conservator-free construction minimizes footprint while preventing moisture ingress. With models ranging from S9-M to S11-M, it provides flexible options for 10kV-35kV distribution networks nationwide.

• High Efficiency
  With an efficiency rating of over 98%, our transformer ensures optimal energy saving and reduced operational costs.
• Robust Design
  Constructed with high-quality materials, it guarantees long-term reliability and durability, with a lifespan exceeding 30 years.
• Advanced Cooling System
  Equipped with a self-cooling feature, the transformer maintains stable operation even under high load conditions.
• Smart Monitoring
  Integrated with advanced monitoring technology, it allows real-time tracking and data analysis for efficient maintenance and performance optimization.
• Enhanced Safety
  The transformer complies with stringent safety standards and features overcurrent protection and lightning arrester for enhanced safety measures.
• Environmental Friendly
  Designed with eco-friendly insulation materials, it minimizes environmental impact and helps in achieving sustainable energy goals.

Type	Three Phase Oil-immersed Distribution Transformer
Model	S11~20
Installation	Outdoor
Altitude	≤1000m
Rated Power	2500KVA or others
Cooling Method	ONAN/KNAN
Primary Voltage	35KV
Secondary Voltage	400V or others
Rated Frequence	50HZ
Insulation oil	Mineral oil
Tapping Range	+2×2.5%
Temperature rise (℃)	65
Connection Group	Dyn11

• Industrial Sector
  Used in factories and manufacturing plants to efficiently distribute power to machinery and equipment, ensuring seamless operation.
• Commercial Buildings
  Ideal for powering shopping malls, office complexes, and commercial centers, providing stable electricity supply for lighting, HVAC systems, and elevators.
• Residential Areas
  Deployed in residential neighborhoods for reliable distribution of electricity to homes, apartments, and community facilities.
• Renewable Energy Projects
  Integrated into wind farms and solar power plants to step up voltage for grid connection and ensure efficient energy transmission.
• Infrastructure Development
  Supports the electrical grid in urban development projects, including hospitals, schools, and public buildings, ensuring uninterrupted power supply.

1. Transportation
   Secure the transformer firmly during transport to prevent movement or tipping. Use proper lifting equipment and avoid impacts or tilting beyond 15°. Protect from rain and mechanical damage.
2. Deliverable Check
   Upon receipt, inspect for physical damage, verify nameplate data, and check for missing accessories. Report any discrepancies immediately.
3. Storage
   Store in a dry, ventilated area away from corrosive substances. If outdoors, cover with waterproof material and elevate to prevent moisture ingress.
4. Installation Environment Requirements
   Install on a level, vibration-free foundation. Ambient temperature: -25°C to +40°C. Altitude ≤1000m. Avoid areas with excessive dust, corrosive gases, or flood risk.
5. Electrical Installation
   Connect primary and secondary cables as per wiring diagram. Ensure all terminals are clean and tight. Ground the transformer according to local codes.
6. Common Components
   Main tank, conservator (if applicable), bushings, tap changer, oil level gauge, thermometer, pressure relief device, and grounding terminals.
7. Common Operation
   Regularly monitor oil level, temperature, and load. Operate tap changer only under no-load. Keep the area around the transformer clear.
8. Fuse Installation
   Install fuses on the low-voltage side as per rated current. Use correct fuse type and ensure secure mounting.
9. DC Resistance
   Measure winding DC resistance before commissioning. Values should match factory test reports. Significant deviation may indicate internal faults.
10. Pressure Resistance
    Perform insulation resistance and withstand voltage tests as per standards before energizing. Ensure all results are within specified limits.
11. Transformer Ratio
    Verify voltage ratio using a transformer turns ratio tester. Results should conform to nameplate values.
12. Power-on Operation
    Confirm all connections and safety checks are complete. Power on with no load, monitor for abnormal noise, vibration, or leakage. Gradually apply load.
13. Power-off Repair
    Disconnect all power sources and ground the transformer before maintenance. Wait for cooling before opening covers.
14. General Maintenance
    Inspect oil level, color, and dielectric strength regularly. Clean bushings, check for leaks, tighten connections, and check protective devices.
15. Component Maintenance
    Service tap changers, relays, and gauges as per manufacturer instructions. Replace gaskets and seals if oil leaks are detected.
16. Component Replacement
    Use only approved spare parts. De-energize and isolate the transformer before replacing bushings, gaskets, or other components.
17. Transformer Troubleshooting
    Common issues: overheating, abnormal noise, oil leakage, or tripping. Investigate causes such as overload, short circuit, or insulation failure. Consult technical support if needed.
18. Table of Tightening Torque
    Refer to the manufacturer's manual for recommended torque values for all fasteners.