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High-Capacity 20kV Oil-Immersed Power Transformer for Industrial & Utility Power Systems

The 20kV oil-immersed power transformer is a high-performance medium-voltage distribution unit designed for stable and efficient power transmission in utility grids, industrial plants, and large infrastructure projects. It is widely applied in regions requiring 20kV class distribution systems with high reliability and energy efficiency.

Built with advanced cold-rolled silicon steel cores and oxygen-free copper windings, the transformer delivers low energy loss, reduced noise, and strong overload capability. Its fully sealed tank structure eliminates the need for an oil conservator, preventing oil oxidation and extending service life to more than 25 years under standard operating conditions.

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    product details

    Product Parameter

    Parameter

    Specification
    Rated Capacity 30kVA – 2500kVA
    High Voltage 20kV
    Low Voltage 0.4kV (customizable)
    Frequency 50Hz / 60Hz
    Tap Range ±5% or ±2×2.5%
    Connection Group Dyn11 / Yyn0
    Cooling Method ONAN (Oil Natural Air Natural)
    Insulation Class Class F / Class H
    No-Load Loss 90W – 1800W
    Load Loss (75℃) 750W – 23000W
    No-Load Current 0.4% – 2.0%
    Impedance Voltage 4% – 6%
    Insulation Level LI 125kV / AC 50kV

    Product Applications

    Medium-Voltage Utility Distribution Networks
    The 20kV oil-immersed transformer is widely used in regional power distribution systems where medium-voltage transmission is required. It efficiently steps down 20kV electricity to low-voltage 0.4kV networks, ensuring stable supply for residential areas, commercial districts, and public infrastructure. With efficiency levels reaching up to 98% under rated load, it significantly reduces transmission losses in utility-scale applications.
    Heavy Industrial Power Systems
    This transformer is suitable for energy-intensive industries such as metallurgy, mining, petrochemical plants, and large-scale manufacturing facilities. It supports continuous operation under heavy load conditions and can withstand short-term overloads of up to 130% of rated capacity, ensuring uninterrupted production processes and minimizing downtime in critical industrial environments.
    Large Infrastructure & Renewable Energy Projects
    The 20kV transformer is widely applied in infrastructure projects such as transportation systems, airports, and commercial complexes, as well as renewable energy installations like solar farms and wind power stations. It ensures stable voltage regulation and grid integration, operating reliably in harsh environments ranging from -40°C to +45°C, making it suitable for outdoor and remote installations.

    Product Advantages

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    High Operating Efficiency
    Optimized internal design supports efficient and stable power transmission performance.
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    Integrated Structural Design
    Compact finished transformer structure ensures durability and reliable operation. 
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    Fully Sealed Protection
    Sealed tank structure improves operational reliability and equipment lifespan. 
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    Improved Insulation Reliability
    Advanced oil treatment process enhances insulation strength and operational safety. 
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    Stable Mechanical Performance
    Robust assembly structure ensures safe transportation and long-term operation. 
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    Wide Capacity Coverage
    Suitable for different power distribution systems from small to large capacities.

    Key Benefits

    The 20kV oil-immersed power transformer is a robust and efficient solution for modern medium-voltage distribution networks. With its high efficiency, strong overload capacity, and long service life, it is widely used in utility systems, industrial operations, and infrastructure projects.

    Its combination of reliability, energy-saving performance, and low maintenance requirements makes it a cost-effective choice for long-term power system stability.

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    FAQ

    1. What makes a 20kV transformer different from lower voltage models?

    It is designed for medium-voltage distribution systems requiring 20kV input levels, offering higher insulation requirements and improved system compatibility.

    2. Can this transformer operate under continuous heavy load conditions?

    Yes, it is designed for stable long-term operation and can handle fluctuating loads in industrial and utility environments.

    3. Is this transformer suitable for outdoor installation?

    Yes, its sealed structure and strong insulation system make it suitable for both indoor and outdoor applications.

    4. What type of cooling system is used?

    It uses ONAN (Oil Natural Air Natural) cooling, relying on natural oil circulation and air cooling for heat dissipation.

    5. Can the specifications be customized for different projects?

    Yes, capacity, voltage ratio, tap range, and connection group can be customized based on project requirements.

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