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In power engineering design, selecting the appropriate rated voltage and rated capacity is the core of ensuring safe grid operation. Many customers are often confused during the initial procurement phase about how to calculate the capacity of a Three-phase transformer based on actual loads. As a professional Three-phase transformer manufacturer, we recommend that the power factor and load factor must be considered during calculation. According to industry experience, the high-voltage side voltage should equal the grid voltage it connects to, while the low-voltage side voltage is typically 10% or 5% higher than the grid voltage. Oversizing leads to waste, while undersizing creates safety hazards; therefore, accurate calculation is the cornerstone of project success.

Specific capacity calculation is not simply a matter of adding up numbers. When providing technical support to our clients, we rely on rigorous formulas: first, calculate the maximum load power per phase, and divide it by the power factor (usually taken as 0.8) to obtain the total three-phase power of the transformer. More importantly, according to the "Electric Power Engineering Design Manual," to ensure stable power supply, the result must be divided by a load factor safety coefficient of approximately 85%. For example, if the calculated total power is 41.25 KW, dividing by 0.85 yields 48.5 KW; in this case, selecting a standard 50kVA Three-phase transformer is the most economical and safe solution. Our factory's technical team is dedicated to providing this kind of refined Three-phase transformer selection service to every client, ensuring that every penny of your investment is worth it.

Beyond technical expertise, we are dedicated to empowering global infrastructure with reliable power solutions. As a globally oriented Three-phase transformer supplier, we prioritize compliance with international standards, including IEC and IEEE, to ensure seamless integration into your local grid. Our team is experienced in handling complex export requirements—from voltage customization to robust logistics—ensuring that your equipment arrives safely and on time, anywhere in the world. If you are looking for a partner who combines cost-efficiency with world-class quality, connect with us today and discover why we are a leading Three-phase transformer factory trusted by international clients.

Industrial Three-phase transformer capacity calculation and testing