S11-M series 6kV–22kV Oil-Immersed Power Transformer

Product Overview

The S11-M series oil-immersed transformers are designed for 6kV to 22kV medium- and high-voltage systems, serving as a core element in 50/60Hz AC power transmission and distribution networks. They are widely used in urban and rural power grids, industrial plants, renewable energy stations (solar and wind), large hydropower projects, and mining operations.

Compared with traditional S9 transformers, the S11-M series achieves 30% lower no-load losses and 30–80% lower no-load current, significantly improving efficiency and reducing lifecycle costs. The units are built with a fully sealed oil tank design for long-term maintenance-free operation and comply with ISO 9001 quality management systems, IEC 60076 (equivalent to GB/T 6451-2015), and CE certification requirements.

The product supports customized high-voltage configurations (6.3kV, 11kV, 13.8kV, 15kV, 20kV, and 22kV) to meet various regional grid standards in Europe, Asia, and the Middle East.

Core Technical Specifications

1. Basic Parameters

2. Key Performance Indicators

Main Product Advantages

1. Wide Voltage Adaptability & Deep Energy Savings

• Customizable Voltage Design:
  The high-voltage winding adopts a segmented winding process to match grid voltages from 6kV to 22kV — ideal for rural distribution grids (6kV), urban networks (10kV), industrial systems (15kV), and main transmission lines (22kV).

• Low-Loss Core Technology:
  Built using 30Q130 grain-oriented silicon steel, combined with seamless wound cores or three-step full miter joints, minimizing magnetic losses. No-load loss is reduced by 30% compared to S9, saving over 15,000 kWh annually for a 1000kVA model.

• Optimized Winding Structure:
  Both HV and LV windings use oxygen-free copper or copper-clad aluminum conductors with helical and continuous winding design. The uniform ampere-turn distribution reduces leakage loss by 15%, while enhanced oil channels improve cooling efficiency, cutting load losses by 8–12%.

2. High Reliability Structure for Harsh Conditions

• Sealed Oil Tank System:
  Available in corrugated (≤1600kVA) or expansion-type (≥2000kVA) tanks. The argon-arc welded design eliminates contact with air, preventing oil aging and extending oil life to 15–20 years.

• Anti-Corrosion Coating:
  The housing undergoes a four-layer surface treatment: sandblasting → phosphating → epoxy zinc primer → acrylic topcoat. The salt fog resistance exceeds 5,000 hours (IEC 60068-2-52), suitable for coastal or chemical industrial zones.

• Short-Circuit Resistance:
  Winding structure reinforced with epoxy glass support tubes and dual-layer mechanical locking. Withstands 25kA for 4s short-circuit stress per IEC 60076-5, ensuring mechanical stability under fault conditions and during transport.

3. Low Noise, Eco-Friendly, and Smart Monitoring

• Noise Reduction Design:
  Optimized magnetic joint structures and damping mounts reduce magnetostrictive and mechanical noise. The S11-M-1000/10 model operates ≤60dB, suitable for residential and urban areas.

• Eco-Friendly Materials:
  Uses biodegradable transformer oil, fully recyclable copper and steel materials, and a leak-free sealed design — preventing soil or groundwater contamination.

• Smart Monitoring (Optional):
  Integrates IoT sensors to monitor oil temperature, oil level, pressure, winding temperature, and partial discharge, transmitting real-time data via 4G/5G networks for predictive maintenance.

4. Flexible Installation & Maintenance-Free Operation

• Flexible Mounting Options:
  Supports indoor (distribution room), outdoor pad-mounted, and renewable substation installations. Track width adaptable from 600–1200mm without major civil works.

• Maintenance-Free Design:
  The hermetically sealed structure minimizes inspection frequency to twice-yearly visual checks, cutting O&M costs by over 60% compared to conventional transformers. Key parts (bushings, tap changers) use reliable international brands, achieving failure rates below 0.1% per year.

Application Scenarios

• Urban & Rural Power Networks:
  6kV/10kV models for rural grid upgrades and city distribution; 20kV/22kV units for new urban power grids, supporting voltage transformation from medium to low voltage.

• Industrial Power Systems:
  Suitable for metallurgy, petrochemical, and manufacturing plants. Handles large motor loads and fluctuating currents without overheating or insulation breakdown.

• Renewable Energy Plants:
  10–22kV units are widely used in solar PV and wind power substations, supporting both collection and step-up circuits to maximize energy conversion efficiency.

• Infrastructure & Engineering Projects:
  Supports hydropower, mining, and railway traction applications, ensuring stable performance in high-humidity or shock-prone environments.

Main Model Examples (6kV–22kV Range)

Quality Assurance & After-Sales Support

• Comprehensive Quality Control:
  Each transformer undergoes over 20 factory tests, including insulation resistance, ratio, impedance, partial discharge, temperature rise, and lightning impulse tests per IEC 60076-3. Random samples are subjected to 1,000-hour endurance tests to ensure 100% compliance before delivery.

• Certifications:
  Certified under ISO 9001, IEC 60076, and CE standards (equivalent to GB/T 6451-2015 and China CCC).

• After-Sales Service:
  24-hour technical support with 4-hour response for critical faults and on-site service within 24–48 hours. Standard 3-year warranty (5 years for core components), with lifetime technical guidance and spare part availability.

Contact Engineer Thor for Technical Support

For professional transformer selection, customization, or technical consultation:
Thor | Electrical Engineer, Wei Shoe Elec
📞 Phone: +86-577-62788197
💬 WhatsApp: +86 159 5777 0984
📧 Email: [email protected]