Technical Analysis and Selection Guide for Oil-Immersed Transformers

1. Comparative Analysis of Mainstream Models

1. Standard Oil-Immersed Transformers

• S9 Series:
  • No-load loss: +15% (vs S11)
  • Typical applications: Rural grid upgrades
  • Phase-out schedule (2024)
• S11 Series:
  • Efficiency advantage: 23% lower load loss
  • Innovative design: 3D wound core
  • Price range: ¥850-1200/kVA

2. New Energy-Efficient Transformers

• S13 Series:
  • No-load loss: 30% lower than S11
  • Standard configuration: Amorphous alloy core
  • ROI analysis: 2.5-year payback period
• SH15 Series:
  • Ultra-low loss: Only 35% of S11’s no-load loss
  • Special technology: Vacuum oil filling + nitrogen sealing
  • Ideal for: Data centers/hospitals

2. Model Selection Matrix

3. Special Environment Solutions

1. High-Altitude Areas

• Altitude correction:
  • 1000-2000m: Capacity ×0.95
  • 2000-3000m: Capacity ×0.90
• Recommended: S11-H series (enhanced radiators)

2. Coastal/Humid Areas

• Protection requirements:
  • Enclosure: IP54 rating
  • Oil: Antioxidant #25 oil
• Recommended: SCB10-C series (humidity-resistant)

4. 2024 Technology Trends

1. Smart Monitoring Systems
   • Online dissolved gas analysis
   • Fiber-optic winding temperature monitoring
   • Case study: Predictive maintenance at 500kV substation
2. Eco-Friendly Solutions
   • Biodegradable insulating oil
   • ≥85% recyclable materials
   • Latest EU RoHS compliance

5. Procurement Decision Tools

1. TCO Calculator:
   • Inputs: Load rate/electricity price/service life
   • Output: 5-year total cost comparison
2. Model Selection Flowchart:

6. FAQ

Q: Can S11 directly replace S9?

• Dimensional comparison table (with tolerances)
• Secondary wiring modification guide

Q: Are amorphous cores really vibration-sensitive?

• Seismic test data (simulated 8-magnitude quake)
• Transportation securing specifications