Factory Direct Supply High Quality SZ22 Three-Phase Oil-Immersed On-Load Tap Changing Transformer

Product Overview & Application

The SZ22 is a three-phase, double-winding oil-immersed power transformer with on-load voltage regulation. The “S” denotes three-phase, “Z” indicates on-load tap changing, and “22” represents the high-efficiency performance level. It is widely used in power plants, substations, large industrial and mining enterprises, and petrochemical facilities for stepping up or stepping down voltage in transmission and distribution systems. The on-load tap changer allows voltage adjustment without interrupting the power supply, which is critical for maintaining stable output under varying load conditions.

Key Features & Structural Design

1.High Energy Efficiency: The SZ22 performance level corresponds to low-loss design. By utilizing high-permeability silicon steel cores and optimized winding structures, it significantly reduces no-load and load losses, helping users meet strict energy efficiency standards and reduce long-term operating costs.

2.Robust Oil-Immersed Construction: The transformer uses high-grade insulating oil for both insulation and cooling. The tank is typically constructed with corrugated steel plates to increase heat dissipation area. The fully sealed design prevents moisture and dust ingress, ensuring reliable outdoor operation in harsh environments.

3.Flexible Cooling Options: Standard cooling is ONAN (Oil Natural Air Natural), with ONAF (Oil Natural Air Forced) available for higher capacity models to handle increased thermal load