Power distribution automation system

The invention discloses a power distribution automation system, and the system comprises a main station layer, a substation layer, a terminal layer and a remote terminal device. The main station layeris a power distribution network comprehensive monitoring platform, the substation layer is four monitoring subunits, and the power distribution network comprehensive monitoring platform is in two-waycommunication with each monitoring subunit through GPRS; the terminal layer comprises a feeder terminal unit, a remote terminal unit, a distribution transformer monitoring terminal and a sulfur hexafluoride gas detector; the four monitoring subunits are respectively the feeder terminal unit, the remote terminal unit, the distribution transformer monitoring terminal and the sulfur hexafluoride gasdetector; the remote terminal device comprises a feeder switch, a ring main unit and a distribution transformer arranged in a power distribution cabinet. And an underground electric leakage detectiondevice is arranged below th