YBM-12 type high-voltage/low-voltage prefabricated substation is used in 10kV ring network power supply, dual power supply or terminal power supply system, as a complete set of equipment for substation, distribution metering, compensation, control and protection. Except for transformers installed in the substation, the high-voltage side is not equipped with four-position (or two-position) load switches, backup protection fuses and plug-in fuses; the low-voltage side can be equipped with control appliances, power distribution appliances, and compensation according to user requirements Devices and meters, etc. Use transformer oil as insulation and arc extinguishing medium.