SC (B) 11 and SCR11 series resin-insulated dry-type power transformers use epoxy resin vacuum casting process, and the windings have excellent insulation performance and strong moisture resistance. There is no risk of leakage in long-term operation, and they are suitable for various indoor power distribution scenarios. Among them, SC (B) 11 series supports flexible selection of copper and aluminum windings (“B” in the model is marked as copper windings), which can be matched according to actual cost and load requirements; SCR11 series adopts a coiled iron core structure, which has better magnetic circuit closure. The no-load loss is reduced by 12% -18% compared with the traditional laminated iron core. At the same time, the operating noise is controlled at 50-65dB, which can meet the needs of noise-sensitive environments.