The project makes use of modern science and technology, electronics and information and communication technology, distribution network line short-circuit and single-phase ground fault monitoring, rapid fault specific location and time to failure is given instructions, help service personnel rushed to the scene, and troubleshooting restore the normal power supply, greatly improving the reliability of power supply. The completion of the system can effectively improve the health level of distribution network equipment and the operation and management level, to reduce the dependence of breakdown judgment experience, reduce and shorten operating time and range of equipment maintenance outage. The system based on fault indicator, single-phase ground fault detection technology and modern communication technology, after the failure of the distribution network, it is within a few minutes after the failure of the fault line and fault location information transmitted via the GSM network to the control center computer, the screen shows the specific fault location and fault time instructions to help maintenance personnel rushed to the scene, troubleshoot and restore normal power supply 1.2 hierarchy of fault location system consists of the following components: the main station installed in the Council (background) monitoring system, the fault indicator and fault signal reception processing of the data on the line is installed repeater station, installed in a substation (or line on the vicinity of the distribution transformer) the asymmetry of the current source, there is provided a central station and data to repeater station The communication links between the communication system. The equipment consists of: the main function of the GSM network, SMS communication module, mobile phone SIM card: provide communications links for the central station and data forwarding station, the central station and dispersed on the same line as the data forwarding station and fault probe composed of a System Center part of the station: equipment consists of: main functions: data forwarding the station came probe line information collected via the communication system by the topological analysis and calculation to find out by computer, system software, application software, central station gateway, UPS, etc. fault location and fault path in the network topology, the record store the corresponding information and communication systems: equipment consists of: main functions: to provide communications links for the central station and data forwarding station by the GSM network, SMS communication module, mobile phone SIM card , the central station and dispersion line data forwarding station the fault probe consisting of a system fault detection part: Equipment: main functions: detection by the asymmetric current source, the fault probe, fault indicator short circuit and single-phase ground fault . Single-phase ground fault occurs, the the asymmetric current source issued a special signal, failure probe detected the drive fault indication signal and issue the appropriate information to the data forwarding station