Oil-filled distribution transformers are designed to provide reliability, safety, and energy efficiency in medium-voltage electrical systems. They use mineral or vegetable insulating oil for cooling and electrical insulation, delivering long service life and high performance in various industrial, commercial, and infrastructure applications.
Technical Features
- Rated power: from 30 kVA up to 300 kVA
- Typical primary distribution voltages: 4.16 kV, 7.2 kV, 13.2 kV, 13.8 kV, 25 kV, and 36.2 kV
- Secondary voltages: 380/220 V, 220/127 V, 480/277 V, 440/254 V, 208/120 V, 600/346 V, and 800/462 V
- Frequency: 50 or 60 Hz
- Cooling: ONAN (Oil Natural, Air Natural)
- Temperature rise class: 55/65 °C
- Connections: Delta/Star (Dyn1, Dyn5, Dyn11) and variations upon request
- Tap changer: ±2×2.5% or ±5×2.5%
- Insulating oil: Mineral or biodegradable (vegetable) available upon request
- Applicable standards: ABNT NBR 5356, NBR 5440, IEC 60076, and INMETRO
Benefits
- High reliability and low maintenance cost
- Excellent performance under severe operating conditions
- Customized options for different environments (urban, industrial, or rural)
- Strict compliance with national and international quality and safety standards
Main Applications
- Urban and rural distribution networks: supplying power to homes, businesses, and small industries
- Industrial sector: providing electricity to machines, motors, and production processes
- Utilities: installation on poles, platforms, or ground-mounted to supply low-voltage consumers
- Public infrastructure: hospitals, schools, shopping centers, commercial buildings, and public lighting
- Renewable energy: integration in photovoltaic and wind systems to adapt generated energy to the distribution grid
- Temporary installations: construction sites, events, or projects requiring safe and stable power supply