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Advanced 13.5kV Oil-Immersed Power Transformer for Industrial & Utility Applications

The 13.5kV oil-immersed power transformer is a high-efficiency distribution unit designed for medium-voltage power systems requiring stable and reliable performance. It is widely applied in industrial facilities, utility grids, and renewable energy projects where customized voltage levels such as 13.5kV are required.

Built with premium cold-rolled silicon steel cores and oxygen-free copper windings, this transformer ensures low energy loss, reduced noise, and long-term durability. The fully sealed tank design prevents oil oxidation and moisture ingress, enabling maintenance-free operation and extended service life of over 25 years under normal conditions.

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    product details

    Product Parameter

    Parameter

    Specification
    Rated Capacity 30kVA – 2500kVA
    High Voltage 13.5kV
    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 80W – 1650W (depending on capacity)
    Load Loss (75℃) 650W – 21500W
    No-Load Current 0.4% – 2.0%
    Impedance Voltage 4% – 6%
    Insulation Level LI 75kV / AC 35kV

    Product Applications

    Medium-Voltage Utility Distribution Systems
    The 13.5kV oil-immersed transformer is commonly used in regional and municipal power distribution networks where non-standard voltage levels are required. It ensures stable voltage conversion and minimizes transmission losses, achieving efficiency levels above 98% under rated conditions. It is suitable for substations, feeder lines, and rural electrification projects.
    Industrial Manufacturing & Processing Plants
    In heavy industries such as metallurgy, cement production, and chemical processing, consistent and reliable power supply is essential. This transformer supports continuous operation under fluctuating loads and can handle temporary overload conditions up to 120%–130%, ensuring uninterrupted production and reducing downtime in high-demand industrial environments.
    Renewable Energy Integration Projects
    For solar farms, wind power systems, and hybrid energy stations, the 13.5kV transformer plays a critical role in voltage regulation and grid connection. It improves power quality through optimized connection groups and supports stable operation in extreme climates ranging from -40°C to +45°C, making it ideal for outdoor renewable installations.

    Product Advantages

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    Stable System Compatibility
    Designed for 13.5kV power systems, suitable for various engineering applications
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    Reliable Finished Quality
    Standardized factory production ensures consistency and long-term stable operation 
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    Standardized Manufacturing Quality
    Unified factory production process ensures consistent and stable product quality 
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    Robust Integrated Structure
    Finished all-in-one design with compact appearance and reliable overall durability
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    Stable Operating Performance
    Smooth and reliable performance in finished condition for long-term power system use
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    Flexible Configuration
    Supports multiple capacities, voltage options, and connection groups 

    Key Benefits

    The 13.5kV oil-immersed power transformer is a reliable and efficient solution for modern medium-voltage distribution systems. Its ability to handle customized voltage requirements, combined with low losses and long service life, makes it a preferred choice for utilities, industrial users, and renewable energy developers.

    With its proven design and stable performance, it ensures consistent power delivery, improved energy efficiency, and reduced long-term operating costs.

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    FAQ

    1. Why is 13.5kV used instead of standard 10kV or 11kV?

    13.5kV is often required in specific regional grids or industrial systems where customized voltage levels are needed for compatibility with existing infrastructure.

    2. Can this transformer be customized for different voltage outputs?

    Yes, the low voltage side and tap range can be adjusted based on project requirements, including different voltage ratios and configurations.

    3. What type of cooling system does it use?

    It uses the ONAN cooling method, where oil circulates naturally to dissipate heat without external pumps or fans.

    4. Is it suitable for high-altitude installations?

    Yes, it can be designed for high-altitude environments with appropriate insulation and cooling adjustments.

    5. What industries typically use 13.5kV transformers?

    They are commonly used in utilities, industrial manufacturing, mining, renewable energy, and infrastructure development projects.

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