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 failure to determine the experience of dependence, reduce and shorten the 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 forwarding station, the the asymmetric current source installed in the substation (distribution transformer or line nearby), central station and data forwarding station contact communication between a communication system. 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 the station parts: equipment: computer, system software, application software, the central station gateway, UPS main function: acquisition the data forwarding station came probe line information via the communication system by topological analysis and calculation to find out fault location and access, record store on the network topology, the appropriate information and communication systems: equipment consisting of short message communication module, mobile phone SIM card: GSM network, the main functions: to provide a communications link to the central station and data forwarding station detection circuit short-circuit and single-phase ground fault, the central station and the dispersion data forwarding station and the fault line probe composed of a system fault detection part: equipment consists of: the main function by the the asymmetric current source, the fault probe, fault indicator: . 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