110kV Oil-Immersed Power Transformer – High-Efficiency, Reliable Power Transmission Core for Global Grid & Industrial Applications

The 110kV oil-immersed power transformer is a core equipment in medium and high-voltage power transmission and distribution systems, widely used in power grids, industrial parks, large-scale mining areas, renewable energy bases and municipal infrastructure projects worldwide. As a mature and reliable power conversion device, it adopts oil-immersed insulation and cooling technology, integrating high efficiency, low loss, strong overload capacity and long service life. It is favored by power companies, industrial enterprises and engineering contractors in Africa, Southeast Asia, Central Asia and Latin America for its stable performance, easy maintenance and strong adaptability to harsh operating environments.

1. Core Technical Parameters & Customization Options

Our 110kV oil-immersed transformer is designed and manufactured in strict accordance with international standards (IEC 60076) and national standards (GB 1094), with flexible configuration options to meet the diverse needs of different regions and scenarios. The core parameters are optimized to balance power conversion efficiency and operational stability, ensuring long-term safe operation under various working conditions.

Basic Technical Specifications

The rated capacity of the transformer ranges from 20 MVA to 50 MVA, covering the power demand of medium and large-scale power supply projects. The high-voltage side rated voltage is 110 ± 8 × 1.25% kV, with a flexible tap changer design that can adjust the output voltage according to the grid voltage fluctuations, ensuring stable power supply. The low-voltage side rated voltage is commonly configured as 10 kV or 35 kV, which can be customized according to the local grid voltage level.

The rated frequency is 50Hz/60Hz, adapting to the power grid frequency requirements of different countries and regions. The common connection groups are Dyn11, Yyn0 and Yd11, which can effectively suppress third harmonic interference, improve power quality, and meet the power supply needs of sensitive electrical equipment such as industrial machinery and precision instruments. The transformer’s impedance voltage is 10.5%–17%, which can effectively limit short-circuit current and protect the transformer and connected equipment from damage.

Customization Capabilities

To meet the specific needs of different application scenarios, we provide comprehensive customization services. For renewable energy projects (wind farms, solar power plants), we can customize transformers with special impedance to dampen harmonics and stabilize grid frequency. For high-temperature and high-humidity regions, we offer enhanced insulation and cooling systems to improve environmental adaptability. Additionally, we can customize the transformer’s dimensions, installation method (indoor/outdoor), and protection level according to the site conditions, as well as configure on-load tap changers (OLTC) for scenarios requiring frequent voltage adjustment.

2. Advanced Structure & Core Advantages

The 110kV oil-immersed transformer adopts a scientific structural design and high-quality materials, with outstanding performance in efficiency, reliability, safety and environmental protection, making it stand out among similar products.

High-Efficiency Energy-Saving Design

The transformer core is made of high-permeability cold-rolled silicon steel sheets, with an optimized step-lap structure that minimizes no-load loss and no-load current, reducing energy consumption during operation. The winding adopts high-quality oxygen-free copper wire, with a reasonable winding structure and advanced winding process, which effectively reduces load loss and improves the overall efficiency of the transformer—up to over 99%, meeting EU Eco-design Tier 2 standards. The low loss design not only saves energy and reduces operational costs for users, but also reduces carbon emissions, in line with global green energy development trends.

Reliable Oil-Immersed Insulation & Cooling System

The transformer uses high-quality mineral insulating oil or FR3 natural ester eco-friendly insulating oil as the insulation and cooling medium. The mineral insulating oil has excellent insulation performance and heat dissipation effect, while the FR3 natural ester oil is biodegradable, non-toxic and fire-resistant, suitable for environmentally sensitive areas such as urban centers and ecological reserves. The oil tank is made of high-quality steel plate, with a corrosion-resistant coating on the surface, which can effectively resist the erosion of rain, dust and corrosive gases in outdoor environments, extending the service life of the transformer.

The cooling system adopts natural oil circulation (ONAN) or forced oil circulation (OFAF) design, which can efficiently dissipate the heat generated during the transformer’s operation, ensuring that the oil temperature and winding temperature are within the safe range even under full load or short-term overload. The forced oil circulation cooling system is suitable for high-load scenarios such as industrial parks and large mining areas, while the natural oil circulation system is more energy-saving and suitable for general power grid applications.

Strong Short-Circuit Resistance & Safety Performance

The transformer’s winding and core are reinforced with special structural designs, with strong mechanical strength, which can withstand the impact of short-circuit current and avoid winding deformation or damage. All sealing parts are made of high-quality acrylate materials, adopting one-time molding technology without interfaces, effectively preventing oil leakage and ensuring the tightness of the transformer. The transformer is equipped with a complete set of protection devices, including gas relays, pressure relief valves, temperature controllers and oil level indicators, which can monitor the operating status of the transformer in real time and issue an alarm or automatically cut off the power in case of abnormal conditions (such as overheating, oil leakage, gas accumulation), ensuring the safety of the transformer and the power grid.

Low Noise & Environmental Adaptability

Through optimized structural design (such as adding noise reduction pads, optimizing the core and winding structure) and advanced manufacturing processes, the noise level of the transformer is controlled within ≤55dB (measured at 1m distance), meeting the noise control requirements of urban and residential areas. The transformer has strong environmental adaptability, and can operate reliably in the temperature range of -30℃ to +50℃, adapting to the harsh climate conditions of high altitude, high temperature, high humidity and cold regions. It is not affected by dust, salt spray and other harsh environments, making it suitable for outdoor installation in various regions.

3. Main Application Scenarios

The 110kV oil-immersed transformer, with its stable performance and diverse configuration options, is widely applicable to various medium and high-voltage power transmission and distribution scenarios, and is the core equipment for ensuring stable power supply.

• Power Grid Construction & Transformation: As a key equipment in 110kV substations, it is used for voltage conversion between high-voltage transmission lines and low-voltage distribution networks, balancing grid load and ensuring stable power supply for urban and rural areas. It is suitable for urban ring network power supply nodes, suburban power grid expansion and rural power grid upgrading projects.

• Renewable Energy Bases: Used in wind farms, solar power plants and other renewable energy projects, it collects the electric energy generated by wind turbines or photovoltaic modules, boosts the voltage to 110kV, and then transmits it to the main power grid. The customized impedance design can effectively adapt to the intermittent and fluctuating characteristics of renewable energy power generation, ensuring grid stability.

• Large Industrial & Mining Enterprises: As the core of the total降压 station in large industrial parks, steel plants, aluminum smelters, chemical plants and data centers, it converts 110kV high-voltage electricity into 10kV or 35kV low-voltage electricity to meet the large power demand of industrial production and equipment operation. It can withstand the impact of industrial load fluctuations and ensure continuous and stable power supply for production.

• Municipal Infrastructure & Public Facilities: Used in large-scale public facilities such as airports, high-speed rail stations, hospitals and shopping malls, as well as municipal infrastructure projects such as urban subway, road lighting and water supply and drainage systems, providing reliable power support for public life and municipal operations. The low-noise and eco-friendly design is suitable for installation in urban centers.

• Cross-Border Power Transmission Projects: Adapt to the power grid standards of different countries and regions, and is used in cross-border power transmission and distribution projects between neighboring countries, with strong adaptability to different grid voltages and frequencies, ensuring the safe and efficient transmission of cross-border electric energy.

4. Core Competitive Advantages

Compared with other 110kV transformers on the market, our product has the following core competitive advantages, which can create higher value for users:

• High Quality & Reliability: Strictly implement international and national manufacturing standards, using high-quality raw materials and advanced production processes (such as fully automatic robot winding, vacuum oil filling). Each transformer undergoes strict testing (including type test, routine test and special test) before leaving the factory, ensuring that the product qualification rate is 100%. The service life of the transformer can reach more than 30 years under normal operating conditions.

• Energy Saving & Environmental Protection: The low-loss design reduces energy consumption and operational costs, and the optional FR3 natural ester insulating oil is eco-friendly, non-toxic and biodegradable, meeting the environmental protection requirements of various regions. The low-noise design reduces environmental noise pollution, suitable for a variety of sensitive environments.

• Strong Customization Capability: According to the user’s specific needs (grid standards, application scenarios, site conditions), we provide one-stop customization services, including capacity, voltage level, connection group, cooling method, protection device and installation method, to ensure that the transformer is perfectly matched with the user’s power supply system.

• Easy Maintenance & Low Operating Cost: The oil-immersed structure is mature and reliable, with simple daily maintenance (only regular oil sampling, cleaning and inspection are required). The low loss design reduces energy costs, and the high-quality components reduce the failure rate and maintenance frequency, effectively lowering the user’s long-term operating costs.

• 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.