Transformers

As a leading oil-immersed transformer manufacturer, NPC Electric specializes in designing and producing high-performance oil-immersed distribution transformers for power utilities, industrial facilities, and commercial networks. Our oil-immersed transformers are built with premium-grade materials and advanced insulation systems to ensure excellent cooling performance, high efficiency, and long service life.
We offer a full range of capacities and voltage ratings, including power transformers and substation transformers, customized to meet specific project requirements. Every unit is tested under strict IEC and ANSI standards to guarantee superior reliability, low noise, and minimal maintenance. Whether you need a standard oil-filled unit or a specialized design for challenging environments, NPC Electric delivers proven transformer solutions trusted worldwide.

The oil-immersed transformer structure consists of a magnetic core, windings, an oil tank, and a cooling system that ensures efficient heat dissipation. The insulating oil provides both cooling and electrical insulation, protecting the distribution transformer from overheating and voltage stress.
Each oil-immersed transformer is enclosed in a sealed steel tank to prevent moisture and contamination. This robust structure ensures durability, reliability, and long service life, making it ideal for power networks and substation transformer applications in residential, commercial, and industrial environments.

Different oil-immersed transformer types are designed to serve various voltage levels and load conditions. The distribution transformer is widely used in residential, rural, and commercial power systems to step down voltage for end users. The substation transformer connects transmission and distribution networks, handling higher power loads with superior cooling and protection systems.
For configuration, the single-phase oil-immersed transformer is ideal for small-scale or remote power applications, while the three-phase oil-immersed transformer is preferred in industrial and utility networks for efficient energy transfer. Larger power transformers are built for grid and plant operations that require high-capacity and long-distance power transmission. Each oil-filled type ensures reliable insulation, low noise, and long service life under diverse environmental conditions.

At NPC Electric, we implement strict transformer testing and quality control throughout every stage of production to ensure the highest level of performance and reliability. Each distribution transformer, including oil-immersed transformers and substation transformers, undergoes rigorous electrical, mechanical, and insulation tests before delivery.
Our testing process follows international standards such as IEC, IEEE, and ANSI, covering parameters like load loss, temperature rise, insulation resistance, and oil quality. Every unit is inspected using advanced equipment and can be verified by third-party agencies like SGS or BV. With our strict transformer quality control, customers receive products that guarantee efficiency, safety, and long-term durability in any environment.