This series of products is an energy-saving solution developed based on the S11-M series, specifically designed for users whose power grids experience significant voltage fluctuations yet demand highly stable voltage supply. It boasts excellent safety performance. The designed voltage regulation range typically spans 10 ± 4 × 2.5% kV (ranging from 9,000 V to 11,000 V), and the tap selection range can also be customized according to specific user requirements. Equipped with a controller, these transformers enable automatic (or manual) remote voltage adjustment of on-load tap changers—without interrupting the power supply—even under full-load conditions. Additionally, they facilitate seamless parallel operation among multiple on-load tap-changing transformers, ensuring continuous and stable secondary voltage output at all times.

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