The on-load automatic capacity and voltage regulating transformer employs key technologies such as on-load capacity regulating switches, intelligent capacity and voltage regulating control systems, low-temperature rise design, distribution detection, and automatic reactive power compensation. Regarding the communication module, it meets the communication functions required by the pilot project (the preliminary design adopts wireless communication technology). It is available in two capacities, large and small. The automatic capacity regulating controller automatically detects and determines the load size based on the user’s load, and through a specially designed on-load capacity regulating switch, it automatically switches between the two capacities without power interruption, achieving automatic adjustment of the transformer’s voltage during operation. This enables automatic switching between two rated capacity operating modes for the distribution transformer, and automatic voltage adjustment based on voltage changes, further improving product reliability while ensuring intelligent energy saving. This product is suitable for locations with strong seasonal electricity consumption, large load fluctuations, concentrated electricity consumption, and low annual average load factors. In rural areas of my country, electricity consumption is mainly concentrated in summer and autumn, with the remaining seasons primarily for lighting, resulting in significant waste of no-load power. During peak agricultural seasons, such as irrigation, harvesting, and tobacco curing, transformer overload is a serious problem. Conversely, during off-peak seasons, when load rates are low, a “large horse pulling a small cart” phenomenon occurs. This is especially true given the current low occupancy rates in real estate development, where demand may not pick up for many years. Therefore, on-load tap-changing distribution transformers are particularly suitable for power grid upgrades. Additionally, they are also suitable for residential areas where daytime and nighttime electricity loads differ significantly.