10kV 800kVA Oil-Immersed Transformer – High-Efficiency, Reliable Distribution Solution for Global Industrial & Grid Applications

The 10kV 800kVA oil-immersed transformer is a high-performance medium-power distribution transformer, manufactured in strict accordance with IEC 60076 and GB 1094 international and national standards. As a mainstream power distribution equipment, it is widely used in industrial parks, small and medium-sized factories, commercial centers, large residential communities, municipal infrastructure and rural power grid upgrading projects worldwide. Featuring moderate capacity, high efficiency, low loss and strong reliability, it perfectly balances power supply demand and operational cost, and is favored by power companies, engineering contractors and industrial enterprises in Africa, Southeast Asia, Central Asia and Latin America.

1. Core Technical Parameters & Configuration Details

The 10kV 800kVA oil-immersed transformer is optimized for medium-load power distribution scenarios, with fixed core parameters and flexible optional configurations to meet the diverse needs of different regions and application scenarios, ensuring stable and efficient power conversion.

Basic Technical Specifications

Rated capacity: 800 kVA, perfectly matching the power demand of medium-sized load scenarios such as small industrial parks, large residential communities and regional commercial centers. High-voltage side rated voltage: 10 ± 8 × 1.25% kV, equipped with an off-circuit tap changer that can adjust the output voltage in 8 levels, effectively adapting to grid voltage fluctuations and ensuring stable power supply for connected equipment.

Low-voltage side rated voltage: 0.4 kV, fully compatible with the low-voltage power distribution standards of most countries and regions, suitable for power supply of industrial production equipment, household appliances and public facility lighting. Rated frequency: 50Hz/60Hz, adaptable to the power grid frequency requirements of different regions, with strong compatibility.

Connection group: Dyn11, a mainstream connection mode for distribution transformers, which can effectively suppress third harmonic interference, reduce the impact of harmonics on the power grid and electrical equipment, and improve power quality. Impedance voltage: 6%, which can effectively limit short-circuit current, protect the transformer and connected power distribution equipment from damage, and improve the safety of the power supply system.

Cooling method: Natural oil circulation (ONAN) as standard, energy-saving and environmentally friendly, with simple structure and low maintenance cost, which can meet the cooling needs of most medium-load scenarios. For high-temperature regions or high-load continuous operation scenarios, forced oil circulation (OFAF) can be optionally configured to improve the transformer’s overload capacity and operating stability.

Optional Configuration Options

To adapt to the diverse needs of global users, we provide a variety of optional configurations. For outdoor installation scenarios, we offer a fully sealed corrugated oil tank design without an oil conservator, which reduces the overall volume of the transformer and improves sealing performance. For scenarios requiring frequent voltage adjustment (such as areas with unstable grid voltage), an on-load tap changer (OLTC) can be configured to adjust the voltage without power failure, ensuring continuous power supply.

Additionally, we can customize the transformer’s protection level (IP20/IP23), anti-corrosion treatment (epoxy zinc-rich primer + topcoat for coastal salt-spray areas), and insulation material (optional FR3 natural ester eco-friendly insulating oil for environmentally sensitive areas). For special application scenarios such as mining areas and industrial parks with high dust and corrosive gases, we provide enhanced dust-proof and anti-corrosion structures to improve the transformer’s environmental adaptability.

2. Advanced Structure & Core Competitive Advantages

The 10kV 800kVA oil-immersed transformer adopts a scientific structural design and high-quality raw materials, with outstanding performance in energy saving, reliability, safety and environmental protection, making it stand out among similar medium-power transformers.

High-Efficiency Low-Loss Design

The transformer core is made of high-permeability cold-rolled silicon steel sheets with an optimized step-lap structure, which minimizes no-load loss and no-load current—no-load loss is controlled within 1.2 kW, and no-load current is ≤0.8% of the rated current, reducing energy consumption during light load or no-load operation. The winding adopts high-quality oxygen-free copper wire, with a tight and concentric winding structure and advanced vacuum impregnation process, which effectively reduces load loss (load loss at rated load is ≤7.5 kW) and improves the overall efficiency of the transformer (up to over 98.8%).

The low-loss design not only significantly reduces the user’s electricity consumption and operational costs, but also reduces carbon emissions, in line with the global green energy development trend. Even under 20% overload conditions, the transformer can operate stably for a long time, with an average temperature rise reduced by 10K compared with ordinary models, effectively extending the service life of the transformer (up to more than 30 years under normal operation).

Reliable Oil-Immersed Insulation & Sealing System

The transformer uses high-quality mineral insulating oil with excellent insulation performance and heat dissipation effect, which can effectively insulate the winding and core, and quickly dissipate the heat generated during operation, ensuring the transformer operates within the safe temperature range. The oil tank adopts a fully sealed corrugated structure (S11-M model), which cancels the traditional oil conservator. The corrugated sheets can automatically expand and contract with the temperature change of the insulating oil, compensating for the volume change of the oil and isolating the transformer oil from the air.

This fully sealed design effectively prevents the oxidation and deterioration of the insulating oil, avoids the intrusion of dust and moisture, and greatly reduces the risk of oil leakage. All sealing parts are made of high-quality aging-resistant acrylate materials, with one-time molding technology without interfaces, ensuring the tightness of the transformer and reducing maintenance frequency. The transformer’s oil tank is made of high-quality steel plate, with a firm structure and good impact resistance, suitable for outdoor installation in various complex environments.

Comprehensive Safety Protection & Low Maintenance

The 10kV 800kVA oil-immersed transformer is equipped with a complete set of protection devices to ensure safe and reliable operation. It is standard equipped with a gas relay, pressure relief valve, temperature controller and oil level indicator, which can monitor the operating status of the transformer in real time. In case of abnormal conditions such as overheating, oil leakage, gas accumulation or overvoltage, it can issue an audible and visual alarm in time, and can be connected to the power distribution system to realize automatic power cut-off, effectively protecting the transformer and the safety of the power grid.

The transformer is also equipped with a lightning protection device as standard, which can effectively resist lightning strikes and ensure the safe operation of the transformer in thunderstorm-prone areas. The fully sealed structure realizes maintenance-free operation in the short term, and daily maintenance only requires regular oil sampling, cleaning and inspection, without the need for professional maintenance personnel, which greatly reduces maintenance costs and downtime.

Low Noise & Strong Environmental Adaptability

Through optimized structural design—such as adding noise reduction pads at the bottom of the oil tank, optimizing the core and winding structure, and adopting a full-filled insulation process—the noise level of the transformer is controlled within ≤52dB (measured at 1m distance), meeting the noise control requirements of residential areas, commercial centers and other sensitive environments.

The transformer has strong environmental adaptability, and can operate reliably in the temperature range of -30℃ to +50℃, adapting to harsh climate conditions such as high altitude, high temperature, high humidity and cold regions. The surface of the oil tank is treated with anti-corrosion coating, which can effectively resist the erosion of rain, dust, salt spray and corrosive gases, making it suitable for long-term outdoor installation in various regions such as coastal areas, industrial parks and rural areas.

3. Main Application Scenarios

The 10kV 800kVA oil-immersed transformer, with its moderate capacity, stable performance and flexible configuration, is widely applicable to various medium-load power distribution scenarios, and is the core equipment for ensuring stable and efficient power supply.

• Industrial Parks & Small/Medium-Sized Factories: As the core of the power distribution room in small and medium-sized industrial parks, processing plants, workshops and manufacturing enterprises, it converts 10kV high-voltage electricity into 0.4kV low-voltage electricity to meet the power demand of production equipment, lighting and auxiliary facilities. It can withstand the impact of industrial load fluctuations and ensure continuous and stable production.

• Large Residential Communities & Commercial Centers: Used in large residential communities, commercial streets, shopping malls, hotels and office buildings, providing stable and low-noise power supply for residents and commercial users. The low-loss design reduces the power consumption of the transformer itself, and the low-noise feature avoids affecting the daily life of residents and the operation of commercial places.

• Rural Power Grid Upgrading & Municipal Infrastructure: As a key equipment for rural power grid upgrading and municipal infrastructure construction, it is used in rural regional power supply stations, urban ring network power supply nodes, road lighting, water supply and drainage systems and other municipal projects, improving the power supply quality and energy efficiency of the power grid.

• Public Facilities & Public Utilities: Applied to public facilities such as schools, hospitals, parks, bus stations and sports centers, providing safe and stable power support for public life and public services. The reliable protection system ensures the uninterrupted power supply of important public facilities.

• Mining & Quarry Areas: Used in small mining areas, quarries and other mining scenarios, adapting to harsh outdoor environments and dusty working conditions, providing reliable power supply for mining equipment and auxiliary facilities. The enhanced anti-corrosion and dust-proof structure can effectively extend the service life of the transformer in such environments.

4. Core Advantages for Global Users

Compared with other medium-power distribution transformers on the market, our 10kV 800kVA oil-immersed transformer has the following core advantages, creating higher economic and social benefits for global users:

• High Efficiency & Energy Saving: Ultra-low no-load and load loss reduce the user’s electricity consumption and operational costs by 25%–30% compared with ordinary transformers, with a fast return on investment and in line with global green energy requirements.

• High Reliability & Long Service Life: Strict implementation of international manufacturing standards, use of high-quality raw materials and advanced production processes (fully automatic robot winding, vacuum oil filling). Each transformer undergoes strict testing before leaving the factory, with a product qualification rate of 100% and a service life of more than 30 years.

• Flexible Configuration & Strong Compatibility: Multiple optional configurations adapt to the power grid standards and site conditions of different countries and regions, supporting outdoor/indoor installation, and easy to integrate with the existing power distribution system.

• Low Maintenance & Easy Operation: The fully sealed structure realizes short-term maintenance-free operation, and daily maintenance is simple, reducing maintenance costs and downtime; the simple operation interface is easy for on-site personnel to operate and manage.

• Perfect Global After-Sales Service: We have built a complete after-sales service network in more than 100 countries and regions, providing professional technical support, on-site installation guidance, regular maintenance and timely spare parts supply. Our 24/7 technical hotline can solve the user’s operational problems in a timely manner, ensuring the continuous and stable operation of the transformer.