In the wave of vigorous development of the "the Belt and Road" initiative, Qingdao Haiyifeng Industry has completed a significant delivery task. Recently, 16pcs 2500KVA box type transformers departed from Qingdao, China, crossed the ocean, and successfully arrived in Ethiopia, officially joining the Ethiopian State Grid. This key delivery, like a giant rock thrown into a calm lake, has stirred up ripples, greatly enhancing the power supply capacity of Ethiopia's national power grid and becoming a prominent milestone in Qingdao Haiyifeng Industry internationalization journey.
Qingdao Haiyifeng Industry as one of the large domestic manufacturers of electrical complete sets, has always focused on the manufacturing and sales of oil immersed transformers, dry-type transformers, high voltage cabinets, low voltage cabinets, and substations. Under the promotion of the national "the Belt and Road" policy, the company has actively expanded overseas markets. With high-quality products and good business reputation, it has established trade cooperation relations with many countries and regions around the world. The 16 2500KVA box transformers provided for the Ethiopian National Grid this time are another important achievement in the market along the "the Belt and Road".
The 16pcs box type transformers provided this time will effectively enhance the power supply capacity and stability of the local power grid, meeting the electricity needs of residents' daily lives and industrial production. These transformer boxes adopt advanced technology and processes, with characteristics such as high efficiency, energy saving, safety and reliability, and can adapt to the complex geographical environment and climate conditions of Ethiopia.
In the future, the company will further strengthen cooperation with countries along the Belt and Road such as Ethiopia, continuously expand its business areas, and make greater contributions to the local economic development and social progress.
In power transformer applications, selecting the right cooling method is critical for efficiency, lifespan, and operational safety. Among the most widely used transformer cooling systems are ONAN and ONAF cooling methods. Understanding the differences between these two systems helps utilities, industrial plants, and electrical engineers choose the best transformer solution for their projects.
As global power demand continues to grow in 2026, utilities, factories, renewable energy plants, and commercial facilities are increasingly choosing oil filled transformers for reliable and efficient power distribution. Compared with dry-type transformers, oil immersed transformers provide superior cooling performance, higher overload capacity, and longer service life in demanding environments.
Hot spot temperature is one of the most critical factors affecting the lifespan, efficiency, and operational safety of oil immersed transformers. Excessive hot spot temperatures accelerate insulation aging, reduce transformer reliability, and increase the risk of unexpected failures. For industries relying on continuous power supply, maintaining optimal transformer temperature is essential for long-term performance.Modern power systems widely use both ONAN transformer and ONAF transformer cooling methods to control internal heat generation and improve transformer stability. As a professional transformer manufacturer, Qingdao Haiyifeng Industry and Trade designs and manufactures high-efficiency oil immersed transformers engineered for superior thermal performance and lower hot spot temperatures.According to recent 2026 SEO and AI-search optimization trends, structured technical content with direct answers, practical solutions, and clear engineering explanations performs best for both Google Search and AI-driven search engines.
Choosing the right transformer is one of the most important decisions for industrial project developers and engineers. Factors such as energy efficiency, cooling performance, installation environment, operational lifespan, maintenance costs, and load capacity must all be considered carefully.
Among the most widely used transformer types in industrial applications are the oil immersed transformer and the dry type transformer. Each has its own advantages, disadvantages, and ideal application environments.
Power transformers play a vital role in alternating current (AC) power systems. Their main functions include voltage conversion, power transmission, and electrical isolation. By stepping up or stepping down voltage levels, they enable long-distance power transmission with minimal energy loss and ensure safe distribution to end users.
Did you know? Without transformers, the modern power system would be impossible. High-voltage electricity from power plants is stepped down through a series of transformers before being safely delivered to your home's electrical outlet. These silent "power guardians" work every day, but few people truly understand their internal components and their respective functions.
The three main functions of an electrical transformer are to increase or decrease voltage levels (voltage transformation), enable efficient long-distance power transmission, and provide electrical isolation between circuits.
Exploring the disruptive advantages of Haiyifeng transformer's 3D wound core oil-immersed transformers in power distribution. As a national-level manufacturing single-item champion enterprise, Haiyifeng transformer's with its unique amorphous alloy 3D wound core and other energy-saving core technologies, provides power systems with superior cooling efficiency, stronger insulation protection, and sustainable energy transmission solutions.
In our previous overview, we discussed the basic types and properties of transformer oil. However, engineers and maintenance teams often face real-world challenges: Which oil is best for a tropical substation? How often should dielectric strength be tested? Can I top up a mineral‑oil transformer with ester oil? This article provides quantitative benchmarks, a decision framework, and hands‑on maintenance procedures to help you extend transformer life and avoid costly failures.
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