This project uses modern technology, electronic information and communication technology, distribution network line short-circuit and single-phase ground fault monitoring, quickly instructions given specific fault location and fault time, maintenance personnel rushed to the scene, troubleshooting normal power is restored, greatly improving the reliability of power supply. The completion of the system can effectively improve the health and operation and management level of the distribution network equipment, reduce the dependence of fault diagnosis experience fewer and shorter operating time and scope of equipment maintenance outage. The system is based fault indicator technology, single-phase ground fault detection technology and modern communication technology, distribution network fault, it can within a few minutes after the failure of the fault line and fault location information through the GSM network to the control center computer on the screen showing the specific location of the fault and fault time instructions to help service personnel rushed to the scene, troubleshooting, normal power is restored the 1.2 hierarchy fault location system consists of the following components: the main station installed in the Council ( background) monitoring system, installed on the line fault indicator and fault signal receiving and processing data repeater installed in the substation the asymmetric current source (or line distribution transformer near) between the central station and data forwarding station The communication system of the communication links. The equipment consists of: the GSM network, SMS communication module, mobile phone SIM card main functions: to provide a communications link to the central station and data forwarding station, central station and distributed data forwarding station and the fault probe of the line to form a System Center station parts: equipment: computer, system software, application software, the central station gateway, UPS main functions: capture the data forwarding station came probe line information via the communication system by the topological analysis and calculation to find fault location and fault path, the appropriate information and communication systems on the network topology, record storage: device composed of short message communication module, mobile phone SIM card: GSM network, the main function: Repeater provides communication links for the central station and the data line the central station and distributed data forwarding station and the fault probe consisting of a system failure detection Part 1: Equipment: asymmetric current source, the fault probe, fault indicator functions: detection circuit short-circuit and single phase to ground fault. Single-phase ground fault occurs, the asymmetric current source drive fault indication issued a special signal, fault detection probe to the signal and send a corresponding signal to the data repeater station