GB20052-2020 standard energy-saving products Energy efficiency two-stage oil-immersed transformer is a product independently developed by our company through the research and application of new materials and new processes and the combination of independent innovation and technology introduction, through the optimization and innovative design of iron core and coil structure, to reduce no-load loss and noise. The noise level is 20% lower than the current national standard JB/T10088-2016, and the product performance level has reached the domestic advanced level.