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630 kVA 11kV Three-Phase On-Load Tap Changer (OLTC) Transformer

Wound for 11,000 V (11 kV) primary and 415 V / 240 V (3-Phase 4-Wire) secondary, this 630 kVA distribution transformer suits Commercial and institutional buildings, industrial facilities, oil & gas, solar and wind energy. It runs ONAN (Oil Natural Air Natural) with Mineral oil insulation and 4.5% impedance. Copper / Aluminium windings on High-efficiency (CRGO) silicon steel, and ± 2 × 2.5% Off-Circuit Tap Changer (OCTC). Temperature rise is Top Oil ≤ 50K, Winding ≤ 55K (45°C Ambient). Enclosure: Hermetically sealed steel tank, weatherproof for indoor and. Specification is confirmed per order, with compliance to IEC 60076, BS 171, SON NIS, NERC Code as applicable to the order. Typical 30-day delivery, two years warranty, MOQ one set.

Technical Parameters & Ratings

IEC / ANSI CertifiedFactory Standard
Power Rating 630 kVA
Primary Voltage 11,000 V (11 kV)
Secondary Voltage 415 V / 240 V (3-Phase 4-Wire)
Phase Three-phase
Cooling Type ONAN (Oil Natural Air Natural)
Core Material High-efficiency (CRGO) silicon steel
Connection Group Dyn11
Winding Material Copper / Aluminium
Frequency 50 Hz
Insulation Mineral oil
Tap Changer ± 2 × 2.5% Off-Circuit Tap Changer (OCTC)
Short-circuit impedance 4.5%
Temperature Rise Top Oil ≤ 50K, Winding ≤ 55K (45°C Ambient)
Noise Level ≤ 60 dB at 1 meter
Enclosure Hermetically sealed steel tank, weatherproof for indoor and outdoor use
Altitude ≤ 1,000 m or customized
Ambient Temperature Range -30 °C to +50 °C
Accessories Conservator tank, oil level indicator, gas relay, pressure relief valve, etc.
Standards Compliance IEC 60076, BS 171, SON NIS, NERC Code
Applications Commercial and institutional buildings, industrial facilities, oil & gas, solar and wind energy
Transport & Installation Lifting lugs, skid base, galvanized fittings
Warranty Two years
Delivery Time Typically 30 days, depending on quantity
Min. order quantity ≥ 1 set

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

  • Designed for electrical control, automation, and load-side switching functions
  • Configurable internal component arrangement according to process and feeder requirements
  • Supports communication, metering, and interface options for smart plant integration
  • Cabinet construction suitable for industrial and infrastructure environments
  • Project-oriented documentation, labeling, and wiring scheme support available
  • Suitable for export supply and customized control-package delivery

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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