500 kVA 11kV S20 High-Efficiency Three-Phase Oil Transformer

500 kVA 11kV S20 High-Efficiency Three-Phase Oil Transformer

This 500 kVA high-efficiency three-phase oil transformer is intended for distribution projects that prioritize reduced no-load loss, stable service life, and practical export-oriented configuration. Depending on the model, it uses an optimized core design to support energy-saving performance in utility and industrial networks.

Technical Parameters & Ratings

IEC / ANSI CertifiedFactory Standard
Rated Capacity500 kVA
Primary Voltage (U1)11,000 V (11 kV)
Secondary Voltage (U2)415 V / 240 V (3-Phase 4-Wire)
Vector GroupDyn11
Rated Frequency50 Hz
Cooling MethodONAN (Oil Natural Air Natural)
Primary Current (I1)8.75 A
Secondary Current (I2)695.6 A
Guaranteed No-Load Loss (P0)680 W
Guaranteed Load Loss (Pk at 75°C)4600 W
Short-Circuit Impedance (Uk)4.0%
HV Insulation LevelLI 75 / AC 35 (11kV Class)
Temperature Rise LimitsTop Oil ≤ 50K, Winding ≤ 55K (45°C Ambient)
Creepage Distance≥ 31 mm/kV (Outdoor Tropicalized Porcelain)
Core & Coil Weight920 kg
Insulating Oil Weight580 kg
Total Assembled Weight1850 kg
Overall Footprint (L×W×H)1410 mm × 925 mm × 1550 mm
Governing StandardsIEC 60076, BS 171, SON NIS, NERC Code

Technical Highlights

  • This product combines dependable transformer platform design, flexible project configuration, and practical export-oriented construction. It is suitable for applications requiring stable electrical performance, configurable voltage ratios, outdoor durability, and documentation support for international project supply.

Application Scenarios

  • Utility distribution networks
  • Industrial plants and workshops
  • Commercial buildings and mixed-use developments
  • Public infrastructure projects
  • Regional and municipal power distribution systems

Key Features

  • 500 kVA rated capacity with optimized core design for energy-saving applications
  • Three-phase oil-immersed structure for stable outdoor operating performance
  • class configuration suitable for distribution and industrial feeder networks
  • Low-loss design approach intended to reduce operating cost over service life
  • Supports project-based winding, voltage ratio, and accessory customization
  • Suitable for utility and industrial buyers prioritizing efficiency and life-cycle value

Optional Configurations

  • Low-voltage side rating and voltage ratio
  • Frequency: 50 Hz or 60 Hz
  • Vector group and tapping range
  • Copper or aluminum winding
  • Cooling method, accessory package, and monitoring option
  • Tank structure, coating system, and special environmental adaptation
  • Color, nameplate language, and document package
  • Ambient temperature, altitude, and installation condition adaptation
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