Single and 3-Phase 50/60 Hz, Dry and Oil-Filled Padmount Transformers
High-Efficiency Oil-Filled Distribution Transformers | CWS
Powering Industries with Reliable & Energy-Saving Solutions
CWS designs and manufactures high-performance distribution transformers (up to 1000 KVA / 1 MVA) for industrial, commercial, military and utility applications.
Types of Distribution Transformers
- Dry-type and oil-filled transformers
- Single-phase and three-phase configurations
- Voltage support from 120V to 22,900V
Transformer Technologies
1. Conventional Silicon Steel Core Transformers
- Grain-oriented silicon steel lamination
- Available as oil-filled (Mineral Oil or FR3) or dry-type
- Fail-safe construction with long service life
2. Amorphous Metal Transformers (AMT)
- 75% lower core losses using Metglas or nanocrystalline cores
- Ideal for variable load applications like renewable energy
- Preferred by industry leaders such as Shell Oil
Why Choose CWS Transformers?
- High Efficiency - Reduced core & copper losses
- Custom Designs - Tailored to industrial and utility needs
- Durability - Long-lasting dielectric fluids in oil-filled designs
- Future-Ready - Supports AMT technology for sustainability
Technical Specifications
| Feature | Conventional (Si-Fe) | Amorphous (AMT) |
|---|---|---|
| Core Material | Grain-oriented silicon steel | Metglas/Nanocrystalline |
| Core Loss | Standard | 75% Lower |
| Efficiency at Low Load | Moderate | Excellent |
| Size | Compact | Larger |
Applications
- Utility distribution
- Military and industrial installations
- Oil & gas fields
- Renewable energy infrastructure
Medium Voltage Oil-Filled Transformers
MV oil-filled transformers operate from 2.4 kV to 34.5 kV and support up to 69 kV. Used in utilities, industry, and commercial power, they use mineral oil or FR3 esters for efficient insulation and cooling.
Primary Applications
- Utility distribution networks (e.g., 34.5 kV -> 4.16 kV)
- Industrial plants and commercial buildings
- Renewable energy grid interfacing
Typical Ratings
- Voltage Classes: 5-35 kV
- Power: 500 kVA to 20 MVA
- Cooling Types: ONAN, ONAF, KNAN
Advantages of Oil-Filled vs. Dry-Type
| Feature | Oil-Filled | Dry-Type |
|---|---|---|
| Cooling | Better | Air-cooled |
| Voltage | Up to 345 kV | Up to 35 kV |
| Lifespan | 30+ years | 20-30 years |
| Cost | Lower for high ratings | Higher |
| Maintenance | Oil checks | Minimal |
| Fire Risk | Higher | Lower |
Maintenance Practices
- Oil testing (DGA - Dissolved Gas Analysis)
- Infrared inspections
- Bushing and winding resistance checks
- Leak detection
Future Trends
- Biodegradable ester fluids
- IoT-based smart monitoring
- Compact, modular designs
