• Product advantages
• Product parameters
• Ordering instructions

Product advantages

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Key Advantages of our 20kV Three-Phase Oil-Immersed Power Distribution Transformer

• Leading-Edge Winding Technology: Engineered with advanced high-voltage copper tape winding and low-voltage copper foil winding, this 20kV three-phase oil-immersed power distribution transformer delivers unmatched lightning impulse resistance and features premium Class-A insulation materials.

• Superior Mechanical Strength: Designed with low magnetic leakage and exceptional short-circuit withstand capability, our 20kV three-phase oil-immersed power distribution transformer ensures ultimate grid stability.

• Advanced Step-Lap Core Structure: Utilizing a 45° full-oblique joint step-laminated core structure, this 20kV three-phase oil-immersed power distribution transformer significantly lowers operational noise and no-load losses.

Precision-Engineered Tank & Enclosure

• State-of-the-Art CNC Fabrication: The tank of the 20kV three-phase oil-immersed power distribution transformer is processed using top-tier Mitsubishi laser cutting machines and advanced CNC punching and bending equipment to guarantee flawless dimensional accuracy.

• Robot Automatic Welding & Zero-Leakage: Featuring ABB robotic automatic welding and high-precision laser detection, the enclosure eliminates any risk of oil leakage, boasting an extraordinary quality qualification rate of 99.99998%.

• 50-Year Ultra-Durable Coating: Treated with premium electrostatic powder spraying, the anti-corrosion coating system offers exceptional hardness ($\ge 0.4$) and salt spray resistance within 100h, promising up to 50 years of paint durability.

• Fully Sealed & Maintenance-Free: The fully sealed structure protects the cooling medium from aging, offering a maintenance-free service life exceeding 30 years for the 20kV three-phase oil-immersed power distribution transformer.

High-Efficiency Iron Core & Coils

• Premium Silicon Steel Core: The iron core of our 20kV three-phase oil-immersed power distribution transformer is built from high-quality, cold-rolled grain-oriented (CRGO) silicon steel sheets with mineral oxide insulation (sourced from industry giants like Baosteel and Wisco). Precision cutting and stacking processes drastically cut no-load current and operational acoustic noise, enabling energy-saving performance that can meet the European 2015/2014/548/EC ecodesign Tier 2 energy efficiency regulations.

• Patented Winding Innovation: While the low-voltage coils utilize high-grade copper foil for excellent insulation resistance, the high-voltage windings leverage Hengfengshuai Electric’s patented technology using insulated copper wire, providing supreme resistance to radial stresses caused by short circuits.

• Structural Reinforcement: The entire core and coil assembly is specially reinforced to withstand rigorous vibrations during transportation and normal grid operations.

Top-Tier Raw Materials & Components

To ensure the premium quality of each 20kV three-phase oil-immersed power distribution transformer, we only source from world-class suppliers:

• Core Sheets: Baosteel & Wisco high-permeability CRGO silicon steel.

• Conductors: Premium-grade Chinese anaerobic (oxygen-free) copper.

• Insulating Oil: CNPC (PetroChina Kunlun Petroleum) High-Quality 25# Transformer Oil.

Technical Configurations & Safety Standard

• Tinned Copper Connections: Equipped with high-conductivity tinned copper bars for low-voltage outgoing terminals, and robust ring tinned bolts for high-voltage outlet terminals.

• Flexible Tap Changer Options: Standard configuration features a 5-step or 7-step Off-Circuit Tap Changer (NLTC), with On-Load Tap Changer (OLTC) available for customization.

• Advanced Gas Relay Protection: For units rated above 630 kVA, high-sensitivity gas relays are installed as standard to ensure real-time safety monitoring for the 20kV three-phase oil-immersed power distribution transformer.

Why Choose Hengfengshuai 20kV Three-Phase Oil-Immersed Power Distribution Transformer?

As the core power hub for modern green grids and low-carbon industrial projects, choosing Hengfengshuai means choosing a higher grid return on investment (ROI) and significantly reduced operational risks.

Thanks to Hengfengyou Electric's proprietary "Ultra-Low Loss Energy-Saving Power Transformer" patented technology, every Hengfengshuai 20kV three-phase oil-immersed power distribution transformer achieves a 5% saving in raw materials. Compared to standard market alternatives, its comprehensive operational losses are reduced by 10% to 20%.

Whether for urban grid upgrades, large industrial parks, renewable energy plants like wind and solar, or long-distance international transport projects, the Hengfengshuai 20kV three-phase oil-immersed power distribution transformer is your ultimate eco-friendly, energy-saving, and cost-effective turnkey high-voltage power solution.

Product parameters

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 - Input voltage: 20kV 22kv

   - Output voltage: 0.4/0.415kv
   - Capacity: 50kva-5000 kva

   - Frequency: 50/60hz
   - Remark: voltage, capacity, frequency, connection group and loss can be customized according to customer requirements

 

Ordering instructions

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- Main parameters of transformer (voltage, capacity, loss and other main parameters)
- Transformer operating environment (altitude, temperature, humidity, location, etc.)
- Other customization requirements (tap switch, color, oil pillow, etc.)
- The minimum order quantity is 1 sets, worldwide delivery within 7 days
- Normal delivery period of 30 days, worldwide fast delivery