Power distribution main wiring system

The invention relates to a power distribution main wiring system which comprises a power supply wire inlet cabinet, a metering device and a power supply wire outlet cabinet. The wire inlet end of the power supply wire inlet cabinet is connected with an external power supply, the wire outlet end of the power supply wire inlet cabinet is connected with the wire inlet end of the metering device, the wire outlet end of the metering device is connected with the wire inlet end of the power supply wire outlet cabinet through a bus, and the wire outlet end of the power supply wire outlet cabinet is connected with the high voltage side of a transformer. According to the power distribution system, the metering device is added, operation flexibility of the power distribution grid is improved, the power supply environment is improved, and meanwhile the requirement for regional power supply assessment is met. A management terminal device is installed in the metering device, the regional power distribution load assessment is managed in a unifying mode while a preassembled box transformer is in operation, and power supply efficiency and power supply quality are improved.