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High-Efficiency 10kV Oil-Immersed Power Transformer for Industrial & Utility Distribution Networks

The 10kV oil-immersed transformer (S13 series and related models) is a fully sealed, high-efficiency power distribution transformer designed for medium-voltage systems. It features low loss, low noise, and strong overload capacity, making it suitable for continuous operation in industrial, utility, and renewable energy environments.

With a capacity range from 30kVA to 2500kVA, this transformer adopts advanced cold-rolled silicon steel cores and oxygen-free copper windings, ensuring high efficiency and long service life. The fully sealed tank design eliminates the oil conservator, reducing maintenance requirements and preventing oil degradation caused by air exposure.

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    product details

    Product Parameter

    Parameter

    Specification
    Rated Capacity 30kVA – 2500kVA
    High Voltage 6kV / 10kV / 11kV
    Low Voltage 0.4kV
    Frequency 50Hz
    Tap Range ±5% or ±2×2.5%
    Connection Group Dyn11 / Yyn0
    Cooling Method ONAN (Oil Natural Air Natural)
    Insulation Class Class F / Class H materials
    No-Load Loss 80W – 1610W (depending on capacity)
    Load Loss (75℃) 630W – 21000W
    No-Load Current 0.4% – 2.1%
    Impedance Voltage 4% – 4.5%
    Insulation Level (10kV system) LI 75kV / AC 35kV

    Product Applications

    Power Utility Distribution Networks
    The 10kV oil-immersed transformer is widely used in urban and rural grid distribution systems. It supports stable voltage conversion from medium voltage (10kV or 11kV) to low voltage (0.4kV), ensuring continuous power supply for residential areas, public infrastructure, and regional substations. With efficiency up to 98% under rated load conditions, it helps reduce transmission losses in large-scale utility networks operated by grid companies.
    Industrial Manufacturing Plants
    This transformer is highly suitable for industrial environments such as steel plants, cement factories, chemical processing units, and mining operations. Designed for heavy-duty operation, it can withstand frequent load fluctuations and short-time overload conditions up to 1.3 times rated capacity. Its low-noise structure (below standard measured levels) ensures stable performance even in continuous 24/7 industrial production lines.
    Renewable Energy & Infrastructure Projects
    In solar farms, wind power stations, and energy storage systems, the transformer plays a key role in voltage step-up and grid connection. The Dyn11 connection group reduces harmonic distortion and improves power quality for renewable integration. Its sealed tank structure ensures reliable outdoor operation in environments ranging from -45°C to +40°C, making it suitable for remote energy projects.

    Product Advantages

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    High Efficiency Design
    High-quality silicon steel core reduces no-load loss by up to 20% compared with conventional models
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    Compact Structural Design
    The finished transformer operates stably, with a strong structure and reliable performance for long-term industrial applications.
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    Fully Sealed Structure
    Eliminates the oil conservator design, prevents oil oxidation, and extends service life to more than 25 years
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    Vacuum Oil Filling Process
    Oil filling is carried out under vacuum conditions to remove internal moisture and air, improving insulation strength and extending service life
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    Assembly & Structural Reinforcement
    Key components are assembled with reinforced structure to enhance overall mechanical strength and ensure stability during transportation and operation
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    Wide Capacity Range
    Supports flexible configuration from 30kVA to 2500kVA, meeting diverse distribution and industrial power requirements

    Key Benefits

    The 10kV oil-immersed power transformer is a mature and highly reliable solution for modern power distribution systems. With its fully sealed structure, low loss design, and strong adaptability to industrial and utility environments, it delivers long-term operational stability and reduced total cost of ownership.

    It is widely adopted in grid infrastructure, industrial facilities, and renewable energy projects where efficiency, durability, and safety are critical requirements.

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    FAQ

    1. What is the main difference between fully sealed and conventional oil-immersed transformers?

    Fully sealed transformers eliminate the oil conservator and use corrugated tank expansion, reducing oil contact with air and improving insulation aging resistance.

    2. What is the typical service life of a 10kV oil-immersed transformer?

    Under normal operating conditions and proper load management, the service life can reach 20–30 years, depending on environment and maintenance.

    3. Can this transformer operate in extreme climates?

    Yes, it is designed for environments from -45°C to +40°C, and can be installed in both indoor and outdoor applications.

    4. What makes Dyn11 connection important?

    The Dyn11 vector group helps reduce harmonic distortion, improves system stability, and enhances compatibility with modern power grids.

    5. Is this transformer suitable for renewable energy projects?

    Yes, it is widely used in solar and wind power systems due to its stable performance, high efficiency, and strong grid adaptability.

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