20 MVA 66kV/11kV Three-Phase Oil-Immersed Power Transformer

Oil-Immersed Transformers · Power Transformers

20 MVA 66kV/11kV Three-Phase Oil-Immersed Power Transformer

This 20 MVA / three-phase oil-immersed power transformer is designed for utility substation, grid interconnection, and large industrial applications. Suitable for transmission and sub-transmission voltage classes. IEC 60076 design reference; ONAN/ONAF cooling options available. Manufactured and exported from Hefei, China.

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Technical Specifications

Rated Capacity 20 MVA (20,000 kVA)
High Voltage 66.0 kV
Low Voltage 11.0 kV / customized
Frequency 50 Hz / 60 Hz
Phase Three Phase
Cooling Method ONAN / ONAF optional
Vector Group YNd11 / YNyn0 / customized
Tap Changer On-load tap changer (OLTC) / Off-circuit optional
Tapping Range +/-8 x 1.25% (OLTC) / +/-2 x 2.5% (OCTC)
Winding Material Copper
Core Material CRGO silicon steel, grain-oriented
Insulation Medium Mineral insulating oil
Standard IEC 60076 design reference
Installation Outdoor substation / indoor GIS substation

Product Information

Product ID

20_MVA_66KV_11KV_THREE_PHASE_OIL_IMMERSED_POWER_TRANSFORMER

Last Updated

2026-05-17T04:26:02.882452

Application Scenarios

  • Utility substation step-down at / for distribution networks
  • Grid interconnection and power transmission projects in Africa and MENA
  • Large industrial facility main power supply transformers
  • EPC contractor packages for power plant auxiliary and grid connection

Key Features

  • 20 MVA rated capacity for utility substation and grid applications
  • high voltage class for sub-transmission and transmission grid interconnection
  • ONAN standard cooling with ONAF upgrade option for higher ambient temperature sites
  • On-load tap changer (OLTC) available for voltage regulation under load
  • Full copper windings with CRGO grain-oriented silicon steel core for low losses

Frequently Asked Questions

Please send us your required MVA rating, primary voltage, secondary voltage, frequency (Hz), cooling class (ONAN/ONAF/OFAF), vector group, impedance, and installation site conditions. We will respond with a technical proposal and indicative pricing within 24 hours.

The product can be produced according to IEC 60076 and customer technical specifications for power transformer applications. Routine and type tests including temperature rise, impulse, and short-circuit withstand are available. Third-party witnessed testing can be arranged.

Large power transformers are shipped with oil-filled or oil-free transport options depending on voltage class and destination. All units include full documentation: routine test report, nameplate data, packing list, and certificate of origin. Lead time is confirmed at order stage based on specification complexity.

Related Markets & Resources

🌍

Africa & MENA

11kV & 33kV IEC grid requirements
🌏

Middle East & GCC

IEC 60076 · up to 132kV · high ambient
🌎

Latin America

60Hz ANSI/IEEE · 13.8kV / 34.5kV

Buyer's Guide

How to source from China

IEC vs ANSI Standards

Which standard for your project?

Standards & Compliance

The product can be produced according to IEC 60076 and customer technical specifications for power transformer applications. Routine and type tests including temperature rise, impulse, and short-circuit withstand are available. Third-party witnessed testing can be arranged.

Packaging, Delivery & Service

Large power transformers are shipped with oil-filled or oil-free transport options depending on voltage class and destination. All units include full documentation: routine test report, nameplate data, packing list, and certificate of origin. Lead time is confirmed at order stage based on specification complexity.

Please send us your required MVA rating, primary voltage, secondary voltage, frequency (Hz), cooling class (ONAN/ONAF/OFAF), vector group, impedance, and installation site conditions. We will respond with a technical proposal and indicative pricing within 24 hours.

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