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.

A prefabricated substation (also known as a box-type substation or European-style box substation, commonly referred to as "Euro-substation") is a mobile, complete electrical distribution system assembled in advance at the factory. It consists of high- and low-voltage switchgear, transformers, and an enclosure. Primarily designed to replace traditional brick-and-mortar substations, it efficiently delivers both substation and distribution functions.

A prefabricated substation (also known as a box-type substation or European-style box substation, commonly referred to as "Euro-substation") is a mobile, complete electrical distribution system assembled in advance at the factory. It consists of high- and low-voltage switchgear, transformers, and an enclosure. Primarily designed to replace traditional civil-engineering-based substations, it efficiently delivers both substation and distribution functions.

A prefabricated substation (also known as a box-type substation or European-style box substation, commonly referred to as "Euro-substation") is a mobile, complete electrical distribution system assembled in advance at the factory. It consists of high- and low-voltage switchgear, transformers, and an enclosure, and is designed to replace traditional, site-built substations while delivering essential functions for power transformation and distribution.