Abstract: The promotion and construTAion of urban intelligent distribution network cannot be separated from the promotion and application of self-healing control technology. In the double-loop distribution network, the central distribution room or switch station is equipped with a distributed distribution proteTAion self-healing device, which can achieve rapid fault isolation and power supply recovery trough cooperation with each bay line proteTAion, bus proteTAion, etc. In the process of simulation test, for power loss at the substation side,switch tripping, line fault, etc, the self-healing device can quickly close the hot standby switch within the set self-healing closing time, quickly restore power supply and improve the reliability of power supply, under the condition that the self-healing aTAion logic is satisfied.