Oil-Immersed Transformer Core Manufacturers

Efficiency rating of oil-Immersed transformer core and its performance under various load conditions

The efficiency rating of an oil-immersed transformer core typically ranges from 98% to 99.7%, depending on its design, materials used (such as high-grade silicon steel), and manufacturing quality. The core's efficiency is influenced by factors like core losses (hysteresis and eddy current losses) and load losses (resistance in the windings).

Performance Under Various Load Conditions:
Under Light Load:
At low loads, the transformer core still incurs no-load losses, which include core losses such as hysteresis and eddy currents. While these losses are minimal due to the high-quality laminated steel used in the core, they remain constant regardless of the load.
The efficiency tends to be lower under light load conditions because a significant portion of the total losses comes from no-load losses.

At Full Load:
At or near full load, the transformer operates more efficiently as the load losses (due to winding resistance) become more proportional to the load being transferred.
High-grade materials and precise lamination techniques help minimize the magnetic flux leakage, ensuring high efficiency at full load. Most oil-immersed transformer cores perform optimally at or near full capacity, maximizing energy transfer with minimal losses.

Overload Conditions:
In short-term overload situations, the transformer core may handle additional loads without significant efficiency loss, but the insulating oil plays a key role in dissipating the excess heat. Long-term overloads, however, can lead to thermal degradation, reducing efficiency and potentially damaging the core.

Key Efficiency Factors:
Core Material: The use of high-grade silicon steel with low magnetic coercivity improves the magnetic efficiency and reduces energy loss.
Lamination: Thin, tightly laminated sheets reduce eddy currents, which helps maintain high efficiency under various load conditions.
Insulating Oil: Efficient cooling and insulation provided by the oil help maintain optimal performance by preventing overheating and maintaining electrical insulation.

Oil-immersed transformer core is designed to maintain high efficiency across a wide range of load conditions, though they are most efficient when operating closer to full load.